diff --git a/css/print/pdf.scss b/css/print/pdf.scss
index 0720fc26c20..6113810894b 100644
--- a/css/print/pdf.scss
+++ b/css/print/pdf.scss
@@ -96,10 +96,6 @@ html.print-pdf {
 		min-height: auto !important;
 	}
 
-	.reveal .r-fit-text {
-		white-space: normal !important;
-	}
-
 	.reveal img {
 		box-shadow: none;
 	}
diff --git a/dist/reveal.css b/dist/reveal.css
index 42a26be3548..bf3824d33c6 100644
--- a/dist/reveal.css
+++ b/dist/reveal.css
@@ -5,4 +5,4 @@
 *
 * Copyright (C) 2011-2022 Hakim El Hattab, https://hakim.se
 */
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diff --git a/dist/reveal.esm.js b/dist/reveal.esm.js
index fcaf2ba8703..b30e4295d48 100644
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 * Copyright (C) 2011-2022 Hakim El Hattab, https://hakim.se
 */
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Wt={VERSION:"4.3.1",initialize:he,configure:Re,destroy:ke,sync:Ze,syncSlide:et,syncFragments:Z.sync.bind(Z),slide:Qe,left:Ct,right:xt,up:Pt,down:Nt,prev:Mt,next:Dt,navigateLeft:Ct,navigateRight:xt,navigateUp:Pt,navigateDown:Nt,navigatePrev:Mt,navigateNext:Dt,navigateFragment:Z.goto.bind(Z),prevFragment:Z.prev.bind(Z),nextFragment:Z.next.bind(Z),on:Le,off:Ce,addEventListener:Le,removeEventListener:Ce,layout:He,shuffle:it,availableRoutes:ot,availableFragments:Z.availableRoutes.bind(Z),toggleHelp:Te,toggleOverview:ee.toggle.bind(ee),togglePause:Ye,toggleAutoSlide:Ge,isFirstSlide:Ve,isLastSlide:$e,isLastVerticalSlide:Ke,isVerticalSlide:We,isPaused:_e,isAutoSliding:Je,isSpeakerNotes:ce.isSpeakerNotesWindow.bind(ce),isOverview:ee.isActive.bind(ee),isFocused:le.isFocused.bind(le),isPrintingPDF:oe.isPrintingPDF.bind(oe),isReady:()=>S,loadSlide:_.load.bind(_),unloadSlide:_.unload.bind(_),showPreview:Ie,hidePreview:ze,addEventListeners:Se,removeEventListeners:Ae,dispatchEvent:Pe,getState:Et,setState:Rt,getProgress:dt,getIndices:ct,getSlidesAttributes:ft,getSlidePastCount:lt,getTotalSlides:bt,getSlide:yt,getPreviousSlide:()=>p,getCurrentSlide:()=>m,getSlideBackground:wt,getSlideNotes:ce.getSlideNotes.bind(ce),getSlides:ht,getHorizontalSlides:ut,getVerticalSlides:gt,hasHorizontalSlides:pt,hasVerticalSlides:mt,hasNavigatedHorizontally:()=>A.hasNavigatedHorizontally,hasNavigatedVertically:()=>A.hasNavigatedVertically,addKeyBinding:te.addKeyBinding.bind(te),removeKeyBinding:te.removeKeyBinding.bind(te),triggerKey:te.triggerKey.bind(te),registerKeyboardShortcut:te.registerKeyboardShortcut.bind(te),getComputedSlideSize:Be,getScale:()=>U,getConfig:()=>w,getQueryHash:d,getSlidePath:ie.getHash.bind(ie),getRevealElement:()=>n,getSlidesElement:()=>K.slides,getViewportElement:()=>K.viewport,getBackgroundsElement:()=>Q.element,registerPlugin:re.registerPlugin.bind(re),hasPlugin:re.hasPlugin.bind(re),getPlugin:re.getPlugin.bind(re),getPlugins:re.getRegisteredPlugins.bind(re)};return e(h,{...Wt,announceStatus:fe,getStatusText:be,print:oe,focus:le,progress:se,controls:ae,location:ie,overview:ee,fragments:Z,slideContent:_,slideNumber:G,onUserInput:It,closeOverlay:ze,updateSlidesVisibility:rt,layoutSlideContents:qe,transformSlides:xe,cueAutoSlide:St,cancelAutoSlide:At}),Wt}let W=U,K=[];W.initialize=e=>(Object.assign(W,new U(document.querySelector(".reveal"),e)),K.map((e=>e(W))),W.initialize()),["configure","on","off","addEventListener","removeEventListener","registerPlugin"].forEach((e=>{W[e]=(...t)=>{K.push((i=>i[e].call(null,...t)))}})),W.isReady=()=>!1,W.VERSION="4.3.1";export default W;
 //# sourceMappingURL=reveal.esm.js.map
diff --git a/dist/reveal.esm.js.map b/dist/reveal.esm.js.map
index 8cd2662e86d..398bebe25d4 100644
--- a/dist/reveal.esm.js.map
+++ b/dist/reveal.esm.js.map
@@ -1 +1 @@
-{"version":3,"file":"reveal.esm.js","sources":["../js/utils/util.js","../js/utils/device.js","../node_modules/fitty/dist/fitty.module.js","../js/controllers/slidecontent.js","../js/controllers/slidenumber.js","../js/utils/color.js","../js/controllers/backgrounds.js","../js/utils/constants.js","../js/controllers/autoanimate.js","../js/controllers/fragments.js","../js/controllers/overview.js","../js/controllers/keyboard.js","../js/controllers/location.js","../js/controllers/controls.js","../js/controllers/progress.js","../js/controllers/pointer.js","../js/utils/loader.js","../js/controllers/plugins.js","../js/controllers/print.js","../js/controllers/touch.js","../js/controllers/focus.js","../js/controllers/notes.js","../js/components/playback.js","../js/config.js","../js/reveal.js","../js/index.js"],"sourcesContent":["/**\n * Extend object a with the properties of object b.\n * If there's a conflict, object b takes precedence.\n *\n * @param {object} a\n * @param {object} b\n */\nexport const extend = ( a, b ) => {\n\n\tfor( let i in b ) {\n\t\ta[ i ] = b[ i ];\n\t}\n\n\treturn a;\n\n}\n\n/**\n * querySelectorAll but returns an Array.\n */\nexport const queryAll = ( el, selector ) => {\n\n\treturn Array.from( el.querySelectorAll( selector ) );\n\n}\n\n/**\n * classList.toggle() with cross browser support\n */\nexport const toggleClass = ( el, className, value ) => {\n\tif( value ) {\n\t\tel.classList.add( className );\n\t}\n\telse {\n\t\tel.classList.remove( className );\n\t}\n}\n\n/**\n * Utility for deserializing a value.\n *\n * @param {*} value\n * @return {*}\n */\nexport const deserialize = ( value ) => {\n\n\tif( typeof value === 'string' ) {\n\t\tif( value === 'null' ) return null;\n\t\telse if( value === 'true' ) return true;\n\t\telse if( value === 'false' ) return false;\n\t\telse if( value.match( /^-?[\\d\\.]+$/ ) ) return parseFloat( value );\n\t}\n\n\treturn value;\n\n}\n\n/**\n * Measures the distance in pixels between point a\n * and point b.\n *\n * @param {object} a point with x/y properties\n * @param {object} b point with x/y properties\n *\n * @return {number}\n */\nexport const distanceBetween = ( a, b ) => {\n\n\tlet dx = a.x - b.x,\n\t\tdy = a.y - b.y;\n\n\treturn Math.sqrt( dx*dx + dy*dy );\n\n}\n\n/**\n * Applies a CSS transform to the target element.\n *\n * @param {HTMLElement} element\n * @param {string} transform\n */\nexport const transformElement = ( element, transform ) => {\n\n\telement.style.transform = transform;\n\n}\n\n/**\n * Element.matches with IE support.\n *\n * @param {HTMLElement} target The element to match\n * @param {String} selector The CSS selector to match\n * the element against\n *\n * @return {Boolean}\n */\nexport const matches = ( target, selector ) => {\n\n\tlet matchesMethod = target.matches || target.matchesSelector || target.msMatchesSelector;\n\n\treturn !!( matchesMethod && matchesMethod.call( target, selector ) );\n\n}\n\n/**\n * Find the closest parent that matches the given\n * selector.\n *\n * @param {HTMLElement} target The child element\n * @param {String} selector The CSS selector to match\n * the parents against\n *\n * @return {HTMLElement} The matched parent or null\n * if no matching parent was found\n */\nexport const closest = ( target, selector ) => {\n\n\t// Native Element.closest\n\tif( typeof target.closest === 'function' ) {\n\t\treturn target.closest( selector );\n\t}\n\n\t// Polyfill\n\twhile( target ) {\n\t\tif( matches( target, selector ) ) {\n\t\t\treturn target;\n\t\t}\n\n\t\t// Keep searching\n\t\ttarget = target.parentNode;\n\t}\n\n\treturn null;\n\n}\n\n/**\n * Handling the fullscreen functionality via the fullscreen API\n *\n * @see http://fullscreen.spec.whatwg.org/\n * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode\n */\nexport const enterFullscreen = element => {\n\n\telement = element || document.documentElement;\n\n\t// Check which implementation is available\n\tlet requestMethod = element.requestFullscreen ||\n\t\t\t\t\t\telement.webkitRequestFullscreen ||\n\t\t\t\t\t\telement.webkitRequestFullScreen ||\n\t\t\t\t\t\telement.mozRequestFullScreen ||\n\t\t\t\t\t\telement.msRequestFullscreen;\n\n\tif( requestMethod ) {\n\t\trequestMethod.apply( element );\n\t}\n\n}\n\n/**\n * Creates an HTML element and returns a reference to it.\n * If the element already exists the existing instance will\n * be returned.\n *\n * @param {HTMLElement} container\n * @param {string} tagname\n * @param {string} classname\n * @param {string} innerHTML\n *\n * @return {HTMLElement}\n */\nexport const createSingletonNode = ( container, tagname, classname, innerHTML='' ) => {\n\n\t// Find all nodes matching the description\n\tlet nodes = container.querySelectorAll( '.' + classname );\n\n\t// Check all matches to find one which is a direct child of\n\t// the specified container\n\tfor( let i = 0; i < nodes.length; i++ ) {\n\t\tlet testNode = nodes[i];\n\t\tif( testNode.parentNode === container ) {\n\t\t\treturn testNode;\n\t\t}\n\t}\n\n\t// If no node was found, create it now\n\tlet node = document.createElement( tagname );\n\tnode.className = classname;\n\tnode.innerHTML = innerHTML;\n\tcontainer.appendChild( node );\n\n\treturn node;\n\n}\n\n/**\n * Injects the given CSS styles into the DOM.\n *\n * @param {string} value\n */\nexport const createStyleSheet = ( value ) => {\n\n\tlet tag = document.createElement( 'style' );\n\ttag.type = 'text/css';\n\n\tif( value && value.length > 0 ) {\n\t\tif( tag.styleSheet ) {\n\t\t\ttag.styleSheet.cssText = value;\n\t\t}\n\t\telse {\n\t\t\ttag.appendChild( document.createTextNode( value ) );\n\t\t}\n\t}\n\n\tdocument.head.appendChild( tag );\n\n\treturn tag;\n\n}\n\n/**\n * Returns a key:value hash of all query params.\n */\nexport const getQueryHash = () => {\n\n\tlet query = {};\n\n\tlocation.search.replace( /[A-Z0-9]+?=([\\w\\.%-]*)/gi, a => {\n\t\tquery[ a.split( '=' ).shift() ] = a.split( '=' ).pop();\n\t} );\n\n\t// Basic deserialization\n\tfor( let i in query ) {\n\t\tlet value = query[ i ];\n\n\t\tquery[ i ] = deserialize( unescape( value ) );\n\t}\n\n\t// Do not accept new dependencies via query config to avoid\n\t// the potential of malicious script injection\n\tif( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];\n\n\treturn query;\n\n}\n\n/**\n * Returns the remaining height within the parent of the\n * target element.\n *\n * remaining height = [ configured parent height ] - [ current parent height ]\n *\n * @param {HTMLElement} element\n * @param {number} [height]\n */\nexport const getRemainingHeight = ( element, height = 0 ) => {\n\n\tif( element ) {\n\t\tlet newHeight, oldHeight = element.style.height;\n\n\t\t// Change the .stretch element height to 0 in order find the height of all\n\t\t// the other elements\n\t\telement.style.height = '0px';\n\n\t\t// In Overview mode, the parent (.slide) height is set of 700px.\n\t\t// Restore it temporarily to its natural height.\n\t\telement.parentNode.style.height = 'auto';\n\n\t\tnewHeight = height - element.parentNode.offsetHeight;\n\n\t\t// Restore the old height, just in case\n\t\telement.style.height = oldHeight + 'px';\n\n\t\t// Clear the parent (.slide) height. .removeProperty works in IE9+\n\t\telement.parentNode.style.removeProperty('height');\n\n\t\treturn newHeight;\n\t}\n\n\treturn height;\n\n}\n\nconst fileExtensionToMimeMap = {\n\t'mp4': 'video/mp4',\n\t'm4a': 'video/mp4',\n\t'ogv': 'video/ogg',\n\t'mpeg': 'video/mpeg',\n\t'webm': 'video/webm'\n}\n\n/**\n * Guess the MIME type for common file formats.\n */\nexport const getMimeTypeFromFile = ( filename='' ) => {\n\treturn fileExtensionToMimeMap[filename.split('.').pop()]\n}","const UA = navigator.userAgent;\n\nexport const isMobile = /(iphone|ipod|ipad|android)/gi.test( UA ) ||\n\t\t\t\t\t\t( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS\n\nexport const isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );\n\nexport const isAndroid = /android/gi.test( UA );","/*\n * fitty v2.3.3 - Snugly resizes text to fit its parent container\n * Copyright (c) 2020 Rik Schennink <rik@pqina.nl> (https://pqina.nl/)\n */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };\n\nexports.default = function (w) {\n\n  // no window, early exit\n  if (!w) return;\n\n  // node list to array helper method\n  var toArray = function toArray(nl) {\n    return [].slice.call(nl);\n  };\n\n  // states\n  var DrawState = {\n    IDLE: 0,\n    DIRTY_CONTENT: 1,\n    DIRTY_LAYOUT: 2,\n    DIRTY: 3\n  };\n\n  // all active fitty elements\n  var fitties = [];\n\n  // group all redraw calls till next frame, we cancel each frame request when a new one comes in. If no support for request animation frame, this is an empty function and supports for fitty stops.\n  var redrawFrame = null;\n  var requestRedraw = 'requestAnimationFrame' in w ? function () {\n    w.cancelAnimationFrame(redrawFrame);\n    redrawFrame = w.requestAnimationFrame(function () {\n      return redraw(fitties.filter(function (f) {\n        return f.dirty && f.active;\n      }));\n    });\n  } : function () {};\n\n  // sets all fitties to dirty so they are redrawn on the next redraw loop, then calls redraw\n  var redrawAll = function redrawAll(type) {\n    return function () {\n      fitties.forEach(function (f) {\n        return f.dirty = type;\n      });\n      requestRedraw();\n    };\n  };\n\n  // redraws fitties so they nicely fit their parent container\n  var redraw = function redraw(fitties) {\n\n    // getting info from the DOM at this point should not trigger a reflow, let's gather as much intel as possible before triggering a reflow\n\n    // check if styles of all fitties have been computed\n    fitties.filter(function (f) {\n      return !f.styleComputed;\n    }).forEach(function (f) {\n      f.styleComputed = computeStyle(f);\n    });\n\n    // restyle elements that require pre-styling, this triggers a reflow, please try to prevent by adding CSS rules (see docs)\n    fitties.filter(shouldPreStyle).forEach(applyStyle);\n\n    // we now determine which fitties should be redrawn\n    var fittiesToRedraw = fitties.filter(shouldRedraw);\n\n    // we calculate final styles for these fitties\n    fittiesToRedraw.forEach(calculateStyles);\n\n    // now we apply the calculated styles from our previous loop\n    fittiesToRedraw.forEach(function (f) {\n      applyStyle(f);\n      markAsClean(f);\n    });\n\n    // now we dispatch events for all restyled fitties\n    fittiesToRedraw.forEach(dispatchFitEvent);\n  };\n\n  var markAsClean = function markAsClean(f) {\n    return f.dirty = DrawState.IDLE;\n  };\n\n  var calculateStyles = function calculateStyles(f) {\n\n    // get available width from parent node\n    f.availableWidth = f.element.parentNode.clientWidth;\n\n    // the space our target element uses\n    f.currentWidth = f.element.scrollWidth;\n\n    // remember current font size\n    f.previousFontSize = f.currentFontSize;\n\n    // let's calculate the new font size\n    f.currentFontSize = Math.min(Math.max(f.minSize, f.availableWidth / f.currentWidth * f.previousFontSize), f.maxSize);\n\n    // if allows wrapping, only wrap when at minimum font size (otherwise would break container)\n    f.whiteSpace = f.multiLine && f.currentFontSize === f.minSize ? 'normal' : 'nowrap';\n  };\n\n  // should always redraw if is not dirty layout, if is dirty layout, only redraw if size has changed\n  var shouldRedraw = function shouldRedraw(f) {\n    return f.dirty !== DrawState.DIRTY_LAYOUT || f.dirty === DrawState.DIRTY_LAYOUT && f.element.parentNode.clientWidth !== f.availableWidth;\n  };\n\n  // every fitty element is tested for invalid styles\n  var computeStyle = function computeStyle(f) {\n\n    // get style properties\n    var style = w.getComputedStyle(f.element, null);\n\n    // get current font size in pixels (if we already calculated it, use the calculated version)\n    f.currentFontSize = parseFloat(style.getPropertyValue('font-size'));\n\n    // get display type and wrap mode\n    f.display = style.getPropertyValue('display');\n    f.whiteSpace = style.getPropertyValue('white-space');\n  };\n\n  // determines if this fitty requires initial styling, can be prevented by applying correct styles through CSS\n  var shouldPreStyle = function shouldPreStyle(f) {\n\n    var preStyle = false;\n\n    // if we already tested for prestyling we don't have to do it again\n    if (f.preStyleTestCompleted) return false;\n\n    // should have an inline style, if not, apply\n    if (!/inline-/.test(f.display)) {\n      preStyle = true;\n      f.display = 'inline-block';\n    }\n\n    // to correctly calculate dimensions the element should have whiteSpace set to nowrap\n    if (f.whiteSpace !== 'nowrap') {\n      preStyle = true;\n      f.whiteSpace = 'nowrap';\n    }\n\n    // we don't have to do this twice\n    f.preStyleTestCompleted = true;\n\n    return preStyle;\n  };\n\n  // apply styles to single fitty\n  var applyStyle = function applyStyle(f) {\n    f.element.style.whiteSpace = f.whiteSpace;\n    f.element.style.display = f.display;\n    f.element.style.fontSize = f.currentFontSize + 'px';\n  };\n\n  // dispatch a fit event on a fitty\n  var dispatchFitEvent = function dispatchFitEvent(f) {\n    f.element.dispatchEvent(new CustomEvent('fit', {\n      detail: {\n        oldValue: f.previousFontSize,\n        newValue: f.currentFontSize,\n        scaleFactor: f.currentFontSize / f.previousFontSize\n      }\n    }));\n  };\n\n  // fit method, marks the fitty as dirty and requests a redraw (this will also redraw any other fitty marked as dirty)\n  var fit = function fit(f, type) {\n    return function () {\n      f.dirty = type;\n      if (!f.active) return;\n      requestRedraw();\n    };\n  };\n\n  var init = function init(f) {\n\n    // save some of the original CSS properties before we change them\n    f.originalStyle = {\n      whiteSpace: f.element.style.whiteSpace,\n      display: f.element.style.display,\n      fontSize: f.element.style.fontSize\n    };\n\n    // should we observe DOM mutations\n    observeMutations(f);\n\n    // this is a new fitty so we need to validate if it's styles are in order\n    f.newbie = true;\n\n    // because it's a new fitty it should also be dirty, we want it to redraw on the first loop\n    f.dirty = true;\n\n    // we want to be able to update this fitty\n    fitties.push(f);\n  };\n\n  var destroy = function destroy(f) {\n    return function () {\n\n      // remove from fitties array\n      fitties = fitties.filter(function (_) {\n        return _.element !== f.element;\n      });\n\n      // stop observing DOM\n      if (f.observeMutations) f.observer.disconnect();\n\n      // reset the CSS properties we changes\n      f.element.style.whiteSpace = f.originalStyle.whiteSpace;\n      f.element.style.display = f.originalStyle.display;\n      f.element.style.fontSize = f.originalStyle.fontSize;\n    };\n  };\n\n  // add a new fitty, does not redraw said fitty\n  var subscribe = function subscribe(f) {\n    return function () {\n      if (f.active) return;\n      f.active = true;\n      requestRedraw();\n    };\n  };\n\n  // remove an existing fitty\n  var unsubscribe = function unsubscribe(f) {\n    return function () {\n      return f.active = false;\n    };\n  };\n\n  var observeMutations = function observeMutations(f) {\n\n    // no observing?\n    if (!f.observeMutations) return;\n\n    // start observing mutations\n    f.observer = new MutationObserver(fit(f, DrawState.DIRTY_CONTENT));\n\n    // start observing\n    f.observer.observe(f.element, f.observeMutations);\n  };\n\n  // default mutation observer settings\n  var mutationObserverDefaultSetting = {\n    subtree: true,\n    childList: true,\n    characterData: true\n  };\n\n  // default fitty options\n  var defaultOptions = {\n    minSize: 16,\n    maxSize: 512,\n    multiLine: true,\n    observeMutations: 'MutationObserver' in w ? mutationObserverDefaultSetting : false\n  };\n\n  // array of elements in, fitty instances out\n  function fittyCreate(elements, options) {\n\n    // set options object\n    var fittyOptions = _extends({}, defaultOptions, options);\n\n    // create fitties\n    var publicFitties = elements.map(function (element) {\n\n      // create fitty instance\n      var f = _extends({}, fittyOptions, {\n\n        // internal options for this fitty\n        element: element,\n        active: true\n      });\n\n      // initialise this fitty\n      init(f);\n\n      // expose API\n      return {\n        element: element,\n        fit: fit(f, DrawState.DIRTY),\n        unfreeze: subscribe(f),\n        freeze: unsubscribe(f),\n        unsubscribe: destroy(f)\n      };\n    });\n\n    // call redraw on newly initiated fitties\n    requestRedraw();\n\n    // expose fitties\n    return publicFitties;\n  }\n\n  // fitty creation function\n  function fitty(target) {\n    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n\n\n    // if target is a string\n    return typeof target === 'string' ?\n\n    // treat it as a querySelector\n    fittyCreate(toArray(document.querySelectorAll(target)), options) :\n\n    // create single fitty\n    fittyCreate([target], options)[0];\n  }\n\n  // handles viewport changes, redraws all fitties, but only does so after a timeout\n  var resizeDebounce = null;\n  var onWindowResized = function onWindowResized() {\n    w.clearTimeout(resizeDebounce);\n    resizeDebounce = w.setTimeout(redrawAll(DrawState.DIRTY_LAYOUT), fitty.observeWindowDelay);\n  };\n\n  // define observe window property, so when we set it to true or false events are automatically added and removed\n  var events = ['resize', 'orientationchange'];\n  Object.defineProperty(fitty, 'observeWindow', {\n    set: function set(enabled) {\n      var method = (enabled ? 'add' : 'remove') + 'EventListener';\n      events.forEach(function (e) {\n        w[method](e, onWindowResized);\n      });\n    }\n  });\n\n  // fitty global properties (by setting observeWindow to true the events above get added)\n  fitty.observeWindow = true;\n  fitty.observeWindowDelay = 100;\n\n  // public fit all method, will force redraw no matter what\n  fitty.fitAll = redrawAll(DrawState.DIRTY);\n\n  // export our fitty function, we don't want to keep it to our selves\n  return fitty;\n}(typeof window === 'undefined' ? null : window);","import { extend, queryAll, closest, getMimeTypeFromFile } from '../utils/util.js'\nimport { isMobile } from '../utils/device.js'\n\nimport fitty from 'fitty';\n\n/**\n * Handles loading, unloading and playback of slide\n * content such as images, videos and iframes.\n */\nexport default class SlideContent {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.startEmbeddedIframe = this.startEmbeddedIframe.bind( this );\n\n\t}\n\n\t/**\n\t * Should the given element be preloaded?\n\t * Decides based on local element attributes and global config.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tshouldPreload( element ) {\n\n\t\t// Prefer an explicit global preload setting\n\t\tlet preload = this.Reveal.getConfig().preloadIframes;\n\n\t\t// If no global setting is available, fall back on the element's\n\t\t// own preload setting\n\t\tif( typeof preload !== 'boolean' ) {\n\t\t\tpreload = element.hasAttribute( 'data-preload' );\n\t\t}\n\n\t\treturn preload;\n\t}\n\n\t/**\n\t * Called when the given slide is within the configured view\n\t * distance. Shows the slide element and loads any content\n\t * that is set to load lazily (data-src).\n\t *\n\t * @param {HTMLElement} slide Slide to show\n\t */\n\tload( slide, options = {} ) {\n\n\t\t// Show the slide element\n\t\tslide.style.display = this.Reveal.getConfig().display;\n\n\t\t// Media elements with data-src attributes\n\t\tqueryAll( slide, 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ).forEach( element => {\n\t\t\tif( element.tagName !== 'IFRAME' || this.shouldPreload( element ) ) {\n\t\t\t\telement.setAttribute( 'src', element.getAttribute( 'data-src' ) );\n\t\t\t\telement.setAttribute( 'data-lazy-loaded', '' );\n\t\t\t\telement.removeAttribute( 'data-src' );\n\t\t\t}\n\t\t} );\n\n\t\t// Media elements with <source> children\n\t\tqueryAll( slide, 'video, audio' ).forEach( media => {\n\t\t\tlet sources = 0;\n\n\t\t\tqueryAll( media, 'source[data-src]' ).forEach( source => {\n\t\t\t\tsource.setAttribute( 'src', source.getAttribute( 'data-src' ) );\n\t\t\t\tsource.removeAttribute( 'data-src' );\n\t\t\t\tsource.setAttribute( 'data-lazy-loaded', '' );\n\t\t\t\tsources += 1;\n\t\t\t} );\n\n\t\t\t// Enable inline video playback in mobile Safari\n\t\t\tif( isMobile && media.tagName === 'VIDEO' ) {\n\t\t\t\tmedia.setAttribute( 'playsinline', '' );\n\t\t\t}\n\n\t\t\t// If we rewrote sources for this video/audio element, we need\n\t\t\t// to manually tell it to load from its new origin\n\t\t\tif( sources > 0 ) {\n\t\t\t\tmedia.load();\n\t\t\t}\n\t\t} );\n\n\n\t\t// Show the corresponding background element\n\t\tlet background = slide.slideBackgroundElement;\n\t\tif( background ) {\n\t\t\tbackground.style.display = 'block';\n\n\t\t\tlet backgroundContent = slide.slideBackgroundContentElement;\n\t\t\tlet backgroundIframe = slide.getAttribute( 'data-background-iframe' );\n\n\t\t\t// If the background contains media, load it\n\t\t\tif( background.hasAttribute( 'data-loaded' ) === false ) {\n\t\t\t\tbackground.setAttribute( 'data-loaded', 'true' );\n\n\t\t\t\tlet backgroundImage = slide.getAttribute( 'data-background-image' ),\n\t\t\t\t\tbackgroundVideo = slide.getAttribute( 'data-background-video' ),\n\t\t\t\t\tbackgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),\n\t\t\t\t\tbackgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );\n\n\t\t\t\t// Images\n\t\t\t\tif( backgroundImage ) {\n\t\t\t\t\t// base64\n\t\t\t\t\tif(  /^data:/.test( backgroundImage.trim() ) ) {\n\t\t\t\t\t\tbackgroundContent.style.backgroundImage = `url(${backgroundImage.trim()})`;\n\t\t\t\t\t}\n\t\t\t\t\t// URL(s)\n\t\t\t\t\telse {\n\t\t\t\t\t\tbackgroundContent.style.backgroundImage = backgroundImage.split( ',' ).map( background => {\n\t\t\t\t\t\t\treturn `url(${encodeURI(background.trim())})`;\n\t\t\t\t\t\t}).join( ',' );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Videos\n\t\t\t\telse if ( backgroundVideo && !this.Reveal.isSpeakerNotes() ) {\n\t\t\t\t\tlet video = document.createElement( 'video' );\n\n\t\t\t\t\tif( backgroundVideoLoop ) {\n\t\t\t\t\t\tvideo.setAttribute( 'loop', '' );\n\t\t\t\t\t}\n\n\t\t\t\t\tif( backgroundVideoMuted ) {\n\t\t\t\t\t\tvideo.muted = true;\n\t\t\t\t\t}\n\n\t\t\t\t\t// Enable inline playback in mobile Safari\n\t\t\t\t\t//\n\t\t\t\t\t// Mute is required for video to play when using\n\t\t\t\t\t// swipe gestures to navigate since they don't\n\t\t\t\t\t// count as direct user actions :'(\n\t\t\t\t\tif( isMobile ) {\n\t\t\t\t\t\tvideo.muted = true;\n\t\t\t\t\t\tvideo.setAttribute( 'playsinline', '' );\n\t\t\t\t\t}\n\n\t\t\t\t\t// Support comma separated lists of video sources\n\t\t\t\t\tbackgroundVideo.split( ',' ).forEach( source => {\n\t\t\t\t\t\tlet type = getMimeTypeFromFile( source );\n\t\t\t\t\t\tif( type ) {\n\t\t\t\t\t\t\tvideo.innerHTML += `<source src=\"${source}\" type=\"${type}\">`;\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tvideo.innerHTML += `<source src=\"${source}\">`;\n\t\t\t\t\t\t}\n\t\t\t\t\t} );\n\n\t\t\t\t\tbackgroundContent.appendChild( video );\n\t\t\t\t}\n\t\t\t\t// Iframes\n\t\t\t\telse if( backgroundIframe && options.excludeIframes !== true ) {\n\t\t\t\t\tlet iframe = document.createElement( 'iframe' );\n\t\t\t\t\tiframe.setAttribute( 'allowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'mozallowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'webkitallowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'allow', 'autoplay' );\n\n\t\t\t\t\tiframe.setAttribute( 'data-src', backgroundIframe );\n\n\t\t\t\t\tiframe.style.width  = '100%';\n\t\t\t\t\tiframe.style.height = '100%';\n\t\t\t\t\tiframe.style.maxHeight = '100%';\n\t\t\t\t\tiframe.style.maxWidth = '100%';\n\n\t\t\t\t\tbackgroundContent.appendChild( iframe );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Start loading preloadable iframes\n\t\t\tlet backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );\n\t\t\tif( backgroundIframeElement ) {\n\n\t\t\t\t// Check if this iframe is eligible to be preloaded\n\t\t\t\tif( this.shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {\n\t\t\t\t\tif( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {\n\t\t\t\t\t\tbackgroundIframeElement.setAttribute( 'src', backgroundIframe );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\tthis.layout( slide );\n\n\t}\n\n\t/**\n\t * Applies JS-dependent layout helpers for the given slide,\n\t * if there are any.\n\t */\n\tlayout( slide ) {\n\n\t\t// Autosize text with the r-fit-text class based on the\n\t\t// size of its container. This needs to happen after the\n\t\t// slide is visible in order to measure the text.\n\t\tArray.from( slide.querySelectorAll( '.r-fit-text' ) ).forEach( element => {\n\t\t\tfitty( element, {\n\t\t\t\tminSize: 24,\n\t\t\t\tmaxSize: this.Reveal.getConfig().height * 0.8,\n\t\t\t\tobserveMutations: false,\n\t\t\t\tobserveWindow: false\n\t\t\t} );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Unloads and hides the given slide. This is called when the\n\t * slide is moved outside of the configured view distance.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tunload( slide ) {\n\n\t\t// Hide the slide element\n\t\tslide.style.display = 'none';\n\n\t\t// Hide the corresponding background element\n\t\tlet background = this.Reveal.getSlideBackground( slide );\n\t\tif( background ) {\n\t\t\tbackground.style.display = 'none';\n\n\t\t\t// Unload any background iframes\n\t\t\tqueryAll( background, 'iframe[src]' ).forEach( element => {\n\t\t\t\telement.removeAttribute( 'src' );\n\t\t\t} );\n\t\t}\n\n\t\t// Reset lazy-loaded media elements with src attributes\n\t\tqueryAll( slide, 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ).forEach( element => {\n\t\t\telement.setAttribute( 'data-src', element.getAttribute( 'src' ) );\n\t\t\telement.removeAttribute( 'src' );\n\t\t} );\n\n\t\t// Reset lazy-loaded media elements with <source> children\n\t\tqueryAll( slide, 'video[data-lazy-loaded] source[src], audio source[src]' ).forEach( source => {\n\t\t\tsource.setAttribute( 'data-src', source.getAttribute( 'src' ) );\n\t\t\tsource.removeAttribute( 'src' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Enforces origin-specific format rules for embedded media.\n\t */\n\tformatEmbeddedContent() {\n\n\t\tlet _appendParamToIframeSource = ( sourceAttribute, sourceURL, param ) => {\n\t\t\tqueryAll( this.Reveal.getSlidesElement(), 'iframe['+ sourceAttribute +'*=\"'+ sourceURL +'\"]' ).forEach( el => {\n\t\t\t\tlet src = el.getAttribute( sourceAttribute );\n\t\t\t\tif( src && src.indexOf( param ) === -1 ) {\n\t\t\t\t\tel.setAttribute( sourceAttribute, src + ( !/\\?/.test( src ) ? '?' : '&' ) + param );\n\t\t\t\t}\n\t\t\t});\n\t\t};\n\n\t\t// YouTube frames must include \"?enablejsapi=1\"\n\t\t_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );\n\t\t_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );\n\n\t\t// Vimeo frames must include \"?api=1\"\n\t\t_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );\n\t\t_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );\n\n\t}\n\n\t/**\n\t * Start playback of any embedded content inside of\n\t * the given element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tstartEmbeddedContent( element ) {\n\n\t\tif( element && !this.Reveal.isSpeakerNotes() ) {\n\n\t\t\t// Restart GIFs\n\t\t\tqueryAll( element, 'img[src$=\".gif\"]' ).forEach( el => {\n\t\t\t\t// Setting the same unchanged source like this was confirmed\n\t\t\t\t// to work in Chrome, FF & Safari\n\t\t\t\tel.setAttribute( 'src', el.getAttribute( 'src' ) );\n\t\t\t} );\n\n\t\t\t// HTML5 media elements\n\t\t\tqueryAll( element, 'video, audio' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\t// Prefer an explicit global autoplay setting\n\t\t\t\tlet autoplay = this.Reveal.getConfig().autoPlayMedia;\n\n\t\t\t\t// If no global setting is available, fall back on the element's\n\t\t\t\t// own autoplay setting\n\t\t\t\tif( typeof autoplay !== 'boolean' ) {\n\t\t\t\t\tautoplay = el.hasAttribute( 'data-autoplay' ) || !!closest( el, '.slide-background' );\n\t\t\t\t}\n\n\t\t\t\tif( autoplay && typeof el.play === 'function' ) {\n\n\t\t\t\t\t// If the media is ready, start playback\n\t\t\t\t\tif( el.readyState > 1 ) {\n\t\t\t\t\t\tthis.startEmbeddedMedia( { target: el } );\n\t\t\t\t\t}\n\t\t\t\t\t// Mobile devices never fire a loaded event so instead\n\t\t\t\t\t// of waiting, we initiate playback\n\t\t\t\t\telse if( isMobile ) {\n\t\t\t\t\t\tlet promise = el.play();\n\n\t\t\t\t\t\t// If autoplay does not work, ensure that the controls are visible so\n\t\t\t\t\t\t// that the viewer can start the media on their own\n\t\t\t\t\t\tif( promise && typeof promise.catch === 'function' && el.controls === false ) {\n\t\t\t\t\t\t\tpromise.catch( () => {\n\t\t\t\t\t\t\t\tel.controls = true;\n\n\t\t\t\t\t\t\t\t// Once the video does start playing, hide the controls again\n\t\t\t\t\t\t\t\tel.addEventListener( 'play', () => {\n\t\t\t\t\t\t\t\t\tel.controls = false;\n\t\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\t// If the media isn't loaded, wait before playing\n\t\t\t\t\telse {\n\t\t\t\t\t\tel.removeEventListener( 'loadeddata', this.startEmbeddedMedia ); // remove first to avoid dupes\n\t\t\t\t\t\tel.addEventListener( 'loadeddata', this.startEmbeddedMedia );\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Normal iframes\n\t\t\tqueryAll( element, 'iframe[src]' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tthis.startEmbeddedIframe( { target: el } );\n\t\t\t} );\n\n\t\t\t// Lazy loading iframes\n\t\t\tqueryAll( element, 'iframe[data-src]' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tif( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {\n\t\t\t\t\tel.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes\n\t\t\t\t\tel.addEventListener( 'load', this.startEmbeddedIframe );\n\t\t\t\t\tel.setAttribute( 'src', el.getAttribute( 'data-src' ) );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Starts playing an embedded video/audio element after\n\t * it has finished loading.\n\t *\n\t * @param {object} event\n\t */\n\tstartEmbeddedMedia( event ) {\n\n\t\tlet isAttachedToDOM = !!closest( event.target, 'html' ),\n\t\t\tisVisible  \t\t= !!closest( event.target, '.present' );\n\n\t\tif( isAttachedToDOM && isVisible ) {\n\t\t\tevent.target.currentTime = 0;\n\t\t\tevent.target.play();\n\t\t}\n\n\t\tevent.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );\n\n\t}\n\n\t/**\n\t * \"Starts\" the content of an embedded iframe using the\n\t * postMessage API.\n\t *\n\t * @param {object} event\n\t */\n\tstartEmbeddedIframe( event ) {\n\n\t\tlet iframe = event.target;\n\n\t\tif( iframe && iframe.contentWindow ) {\n\n\t\t\tlet isAttachedToDOM = !!closest( event.target, 'html' ),\n\t\t\t\tisVisible  \t\t= !!closest( event.target, '.present' );\n\n\t\t\tif( isAttachedToDOM && isVisible ) {\n\n\t\t\t\t// Prefer an explicit global autoplay setting\n\t\t\t\tlet autoplay = this.Reveal.getConfig().autoPlayMedia;\n\n\t\t\t\t// If no global setting is available, fall back on the element's\n\t\t\t\t// own autoplay setting\n\t\t\t\tif( typeof autoplay !== 'boolean' ) {\n\t\t\t\t\tautoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closest( iframe, '.slide-background' );\n\t\t\t\t}\n\n\t\t\t\t// YouTube postMessage API\n\t\t\t\tif( /youtube\\.com\\/embed\\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {\n\t\t\t\t\tiframe.contentWindow.postMessage( '{\"event\":\"command\",\"func\":\"playVideo\",\"args\":\"\"}', '*' );\n\t\t\t\t}\n\t\t\t\t// Vimeo postMessage API\n\t\t\t\telse if( /player\\.vimeo\\.com\\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {\n\t\t\t\t\tiframe.contentWindow.postMessage( '{\"method\":\"play\"}', '*' );\n\t\t\t\t}\n\t\t\t\t// Generic postMessage API\n\t\t\t\telse {\n\t\t\t\t\tiframe.contentWindow.postMessage( 'slide:start', '*' );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Stop playback of any embedded content inside of\n\t * the targeted slide.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tstopEmbeddedContent( element, options = {} ) {\n\n\t\toptions = extend( {\n\t\t\t// Defaults\n\t\t\tunloadIframes: true\n\t\t}, options );\n\n\t\tif( element && element.parentNode ) {\n\t\t\t// HTML5 media elements\n\t\t\tqueryAll( element, 'video, audio' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {\n\t\t\t\t\tel.setAttribute('data-paused-by-reveal', '');\n\t\t\t\t\tel.pause();\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Generic postMessage API for non-lazy loaded iframes\n\t\t\tqueryAll( element, 'iframe' ).forEach( el => {\n\t\t\t\tif( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );\n\t\t\t\tel.removeEventListener( 'load', this.startEmbeddedIframe );\n\t\t\t});\n\n\t\t\t// YouTube postMessage API\n\t\t\tqueryAll( element, 'iframe[src*=\"youtube.com/embed/\"]' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {\n\t\t\t\t\tel.contentWindow.postMessage( '{\"event\":\"command\",\"func\":\"pauseVideo\",\"args\":\"\"}', '*' );\n\t\t\t\t}\n\t\t\t});\n\n\t\t\t// Vimeo postMessage API\n\t\t\tqueryAll( element, 'iframe[src*=\"player.vimeo.com/\"]' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {\n\t\t\t\t\tel.contentWindow.postMessage( '{\"method\":\"pause\"}', '*' );\n\t\t\t\t}\n\t\t\t});\n\n\t\t\tif( options.unloadIframes === true ) {\n\t\t\t\t// Unload lazy-loaded iframes\n\t\t\t\tqueryAll( element, 'iframe[data-src]' ).forEach( el => {\n\t\t\t\t\t// Only removing the src doesn't actually unload the frame\n\t\t\t\t\t// in all browsers (Firefox) so we set it to blank first\n\t\t\t\t\tel.setAttribute( 'src', 'about:blank' );\n\t\t\t\t\tel.removeAttribute( 'src' );\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t}\n\n}\n","/**\n * Handles the display of reveal.js' optional slide number.\n */\nexport default class SlideNumber {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'slide-number';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tlet slideNumberDisplay = 'none';\n\t\tif( config.slideNumber && !this.Reveal.isPrintingPDF() ) {\n\t\t\tif( config.showSlideNumber === 'all' ) {\n\t\t\t\tslideNumberDisplay = 'block';\n\t\t\t}\n\t\t\telse if( config.showSlideNumber === 'speaker' && this.Reveal.isSpeakerNotes() ) {\n\t\t\t\tslideNumberDisplay = 'block';\n\t\t\t}\n\t\t}\n\n\t\tthis.element.style.display = slideNumberDisplay;\n\n\t}\n\n\t/**\n\t * Updates the slide number to match the current slide.\n\t */\n\tupdate() {\n\n\t\t// Update slide number if enabled\n\t\tif( this.Reveal.getConfig().slideNumber && this.element ) {\n\t\t\tthis.element.innerHTML = this.getSlideNumber();\n\t\t}\n\n\t}\n\n\t/**\n\t * Returns the HTML string corresponding to the current slide\n\t * number, including formatting.\n\t */\n\tgetSlideNumber( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\t\tlet value;\n\t\tlet format = 'h.v';\n\n\t\tif ( typeof config.slideNumber === 'function' ) {\n\t\t\tvalue = config.slideNumber( slide );\n\t\t} else {\n\t\t\t// Check if a custom number format is available\n\t\t\tif( typeof config.slideNumber === 'string' ) {\n\t\t\t\tformat = config.slideNumber;\n\t\t\t}\n\n\t\t\t// If there are ONLY vertical slides in this deck, always use\n\t\t\t// a flattened slide number\n\t\t\tif( !/c/.test( format ) && this.Reveal.getHorizontalSlides().length === 1 ) {\n\t\t\t\tformat = 'c';\n\t\t\t}\n\n\t\t\t// Offset the current slide number by 1 to make it 1-indexed\n\t\t\tlet horizontalOffset = slide && slide.dataset.visibility === 'uncounted' ? 0 : 1;\n\n\t\t\tvalue = [];\n\t\t\tswitch( format ) {\n\t\t\t\tcase 'c':\n\t\t\t\t\tvalue.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset );\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'c/t':\n\t\t\t\t\tvalue.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset, '/', this.Reveal.getTotalSlides() );\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tlet indices = this.Reveal.getIndices( slide );\n\t\t\t\t\tvalue.push( indices.h + horizontalOffset );\n\t\t\t\t\tlet sep = format === 'h/v' ? '/' : '.';\n\t\t\t\t\tif( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );\n\t\t\t}\n\t\t}\n\n\t\tlet url = '#' + this.Reveal.location.getHash( slide );\n\t\treturn this.formatNumber( value[0], value[1], value[2], url );\n\n\t}\n\n\t/**\n\t * Applies HTML formatting to a slide number before it's\n\t * written to the DOM.\n\t *\n\t * @param {number} a Current slide\n\t * @param {string} delimiter Character to separate slide numbers\n\t * @param {(number|*)} b Total slides\n\t * @param {HTMLElement} [url='#'+locationHash()] The url to link to\n\t * @return {string} HTML string fragment\n\t */\n\tformatNumber( a, delimiter, b, url = '#' + this.Reveal.location.getHash() ) {\n\n\t\tif( typeof b === 'number' && !isNaN( b ) ) {\n\t\t\treturn  `<a href=\"${url}\">\n\t\t\t\t\t<span class=\"slide-number-a\">${a}</span>\n\t\t\t\t\t<span class=\"slide-number-delimiter\">${delimiter}</span>\n\t\t\t\t\t<span class=\"slide-number-b\">${b}</span>\n\t\t\t\t\t</a>`;\n\t\t}\n\t\telse {\n\t\t\treturn `<a href=\"${url}\">\n\t\t\t\t\t<span class=\"slide-number-a\">${a}</span>\n\t\t\t\t\t</a>`;\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","/**\n * Converts various color input formats to an {r:0,g:0,b:0} object.\n *\n * @param {string} color The string representation of a color\n * @example\n * colorToRgb('#000');\n * @example\n * colorToRgb('#000000');\n * @example\n * colorToRgb('rgb(0,0,0)');\n * @example\n * colorToRgb('rgba(0,0,0)');\n *\n * @return {{r: number, g: number, b: number, [a]: number}|null}\n */\nexport const colorToRgb = ( color ) => {\n\n\tlet hex3 = color.match( /^#([0-9a-f]{3})$/i );\n\tif( hex3 && hex3[1] ) {\n\t\thex3 = hex3[1];\n\t\treturn {\n\t\t\tr: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,\n\t\t\tg: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,\n\t\t\tb: parseInt( hex3.charAt( 2 ), 16 ) * 0x11\n\t\t};\n\t}\n\n\tlet hex6 = color.match( /^#([0-9a-f]{6})$/i );\n\tif( hex6 && hex6[1] ) {\n\t\thex6 = hex6[1];\n\t\treturn {\n\t\t\tr: parseInt( hex6.slice( 0, 2 ), 16 ),\n\t\t\tg: parseInt( hex6.slice( 2, 4 ), 16 ),\n\t\t\tb: parseInt( hex6.slice( 4, 6 ), 16 )\n\t\t};\n\t}\n\n\tlet rgb = color.match( /^rgb\\s*\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\)$/i );\n\tif( rgb ) {\n\t\treturn {\n\t\t\tr: parseInt( rgb[1], 10 ),\n\t\t\tg: parseInt( rgb[2], 10 ),\n\t\t\tb: parseInt( rgb[3], 10 )\n\t\t};\n\t}\n\n\tlet rgba = color.match( /^rgba\\s*\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\,\\s*([\\d]+|[\\d]*.[\\d]+)\\s*\\)$/i );\n\tif( rgba ) {\n\t\treturn {\n\t\t\tr: parseInt( rgba[1], 10 ),\n\t\t\tg: parseInt( rgba[2], 10 ),\n\t\t\tb: parseInt( rgba[3], 10 ),\n\t\t\ta: parseFloat( rgba[4] )\n\t\t};\n\t}\n\n\treturn null;\n\n}\n\n/**\n * Calculates brightness on a scale of 0-255.\n *\n * @param {string} color See colorToRgb for supported formats.\n * @see {@link colorToRgb}\n */\nexport const colorBrightness = ( color ) => {\n\n\tif( typeof color === 'string' ) color = colorToRgb( color );\n\n\tif( color ) {\n\t\treturn ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;\n\t}\n\n\treturn null;\n\n}","import { queryAll } from '../utils/util.js'\nimport { colorToRgb, colorBrightness } from '../utils/color.js'\n\n/**\n * Creates and updates slide backgrounds.\n */\nexport default class Backgrounds {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'backgrounds';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Creates the slide background elements and appends them\n\t * to the background container. One element is created per\n\t * slide no matter if the given slide has visible background.\n\t */\n\tcreate() {\n\n\t\t// Clear prior backgrounds\n\t\tthis.element.innerHTML = '';\n\t\tthis.element.classList.add( 'no-transition' );\n\n\t\t// Iterate over all horizontal slides\n\t\tthis.Reveal.getHorizontalSlides().forEach( slideh => {\n\n\t\t\tlet backgroundStack = this.createBackground( slideh, this.element );\n\n\t\t\t// Iterate over all vertical slides\n\t\t\tqueryAll( slideh, 'section' ).forEach( slidev => {\n\n\t\t\t\tthis.createBackground( slidev, backgroundStack );\n\n\t\t\t\tbackgroundStack.classList.add( 'stack' );\n\n\t\t\t} );\n\n\t\t} );\n\n\t\t// Add parallax background if specified\n\t\tif( this.Reveal.getConfig().parallaxBackgroundImage ) {\n\n\t\t\tthis.element.style.backgroundImage = 'url(\"' + this.Reveal.getConfig().parallaxBackgroundImage + '\")';\n\t\t\tthis.element.style.backgroundSize = this.Reveal.getConfig().parallaxBackgroundSize;\n\t\t\tthis.element.style.backgroundRepeat = this.Reveal.getConfig().parallaxBackgroundRepeat;\n\t\t\tthis.element.style.backgroundPosition = this.Reveal.getConfig().parallaxBackgroundPosition;\n\n\t\t\t// Make sure the below properties are set on the element - these properties are\n\t\t\t// needed for proper transitions to be set on the element via CSS. To remove\n\t\t\t// annoying background slide-in effect when the presentation starts, apply\n\t\t\t// these properties after short time delay\n\t\t\tsetTimeout( () => {\n\t\t\t\tthis.Reveal.getRevealElement().classList.add( 'has-parallax-background' );\n\t\t\t}, 1 );\n\n\t\t}\n\t\telse {\n\n\t\t\tthis.element.style.backgroundImage = '';\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'has-parallax-background' );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Creates a background for the given slide.\n\t *\n\t * @param {HTMLElement} slide\n\t * @param {HTMLElement} container The element that the background\n\t * should be appended to\n\t * @return {HTMLElement} New background div\n\t */\n\tcreateBackground( slide, container ) {\n\n\t\t// Main slide background element\n\t\tlet element = document.createElement( 'div' );\n\t\telement.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );\n\n\t\t// Inner background element that wraps images/videos/iframes\n\t\tlet contentElement = document.createElement( 'div' );\n\t\tcontentElement.className = 'slide-background-content';\n\n\t\telement.appendChild( contentElement );\n\t\tcontainer.appendChild( element );\n\n\t\tslide.slideBackgroundElement = element;\n\t\tslide.slideBackgroundContentElement = contentElement;\n\n\t\t// Syncs the background to reflect all current background settings\n\t\tthis.sync( slide );\n\n\t\treturn element;\n\n\t}\n\n\t/**\n\t * Renders all of the visual properties of a slide background\n\t * based on the various background attributes.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tsync( slide ) {\n\n\t\tconst element = slide.slideBackgroundElement,\n\t\t\tcontentElement = slide.slideBackgroundContentElement;\n\n\t\tconst data = {\n\t\t\tbackground: slide.getAttribute( 'data-background' ),\n\t\t\tbackgroundSize: slide.getAttribute( 'data-background-size' ),\n\t\t\tbackgroundImage: slide.getAttribute( 'data-background-image' ),\n\t\t\tbackgroundVideo: slide.getAttribute( 'data-background-video' ),\n\t\t\tbackgroundIframe: slide.getAttribute( 'data-background-iframe' ),\n\t\t\tbackgroundColor: slide.getAttribute( 'data-background-color' ),\n\t\t\tbackgroundGradient: slide.getAttribute( 'data-background-gradient' ),\n\t\t\tbackgroundRepeat: slide.getAttribute( 'data-background-repeat' ),\n\t\t\tbackgroundPosition: slide.getAttribute( 'data-background-position' ),\n\t\t\tbackgroundTransition: slide.getAttribute( 'data-background-transition' ),\n\t\t\tbackgroundOpacity: slide.getAttribute( 'data-background-opacity' ),\n\t\t};\n\n\t\tconst dataPreload = slide.hasAttribute( 'data-preload' );\n\n\t\t// Reset the prior background state in case this is not the\n\t\t// initial sync\n\t\tslide.classList.remove( 'has-dark-background' );\n\t\tslide.classList.remove( 'has-light-background' );\n\n\t\telement.removeAttribute( 'data-loaded' );\n\t\telement.removeAttribute( 'data-background-hash' );\n\t\telement.removeAttribute( 'data-background-size' );\n\t\telement.removeAttribute( 'data-background-transition' );\n\t\telement.style.backgroundColor = '';\n\n\t\tcontentElement.style.backgroundSize = '';\n\t\tcontentElement.style.backgroundRepeat = '';\n\t\tcontentElement.style.backgroundPosition = '';\n\t\tcontentElement.style.backgroundImage = '';\n\t\tcontentElement.style.opacity = '';\n\t\tcontentElement.innerHTML = '';\n\n\t\tif( data.background ) {\n\t\t\t// Auto-wrap image urls in url(...)\n\t\t\tif( /^(http|file|\\/\\/)/gi.test( data.background ) || /\\.(svg|png|jpg|jpeg|gif|bmp|webp)([?#\\s]|$)/gi.test( data.background ) ) {\n\t\t\t\tslide.setAttribute( 'data-background-image', data.background );\n\t\t\t}\n\t\t\telse {\n\t\t\t\telement.style.background = data.background;\n\t\t\t}\n\t\t}\n\n\t\t// Create a hash for this combination of background settings.\n\t\t// This is used to determine when two slide backgrounds are\n\t\t// the same.\n\t\tif( data.background || data.backgroundColor || data.backgroundGradient || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {\n\t\t\telement.setAttribute( 'data-background-hash', data.background +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundSize +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundImage +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundVideo +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundIframe +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundColor +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundGradient +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundRepeat +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundPosition +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundTransition +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundOpacity );\n\t\t}\n\n\t\t// Additional and optional background properties\n\t\tif( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );\n\t\tif( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;\n\t\tif( data.backgroundGradient ) element.style.backgroundImage = data.backgroundGradient;\n\t\tif( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );\n\n\t\tif( dataPreload ) element.setAttribute( 'data-preload', '' );\n\n\t\t// Background image options are set on the content wrapper\n\t\tif( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;\n\t\tif( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;\n\t\tif( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;\n\t\tif( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;\n\n\t\t// If this slide has a background color, we add a class that\n\t\t// signals if it is light or dark. If the slide has no background\n\t\t// color, no class will be added\n\t\tlet contrastColor = data.backgroundColor;\n\n\t\t// If no bg color was found, or it cannot be converted by colorToRgb, check the computed background\n\t\tif( !contrastColor || !colorToRgb( contrastColor ) ) {\n\t\t\tlet computedBackgroundStyle = window.getComputedStyle( element );\n\t\t\tif( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {\n\t\t\t\tcontrastColor = computedBackgroundStyle.backgroundColor;\n\t\t\t}\n\t\t}\n\n\t\tif( contrastColor ) {\n\t\t\tconst rgb = colorToRgb( contrastColor );\n\n\t\t\t// Ignore fully transparent backgrounds. Some browsers return\n\t\t\t// rgba(0,0,0,0) when reading the computed background color of\n\t\t\t// an element with no background\n\t\t\tif( rgb && rgb.a !== 0 ) {\n\t\t\t\tif( colorBrightness( contrastColor ) < 128 ) {\n\t\t\t\t\tslide.classList.add( 'has-dark-background' );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tslide.classList.add( 'has-light-background' );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the background elements to reflect the current\n\t * slide.\n\t *\n\t * @param {boolean} includeAll If true, the backgrounds of\n\t * all vertical slides (not just the present) will be updated.\n\t */\n\tupdate( includeAll = false ) {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tlet indices = this.Reveal.getIndices();\n\n\t\tlet currentBackground = null;\n\n\t\t// Reverse past/future classes when in RTL mode\n\t\tlet horizontalPast = this.Reveal.getConfig().rtl ? 'future' : 'past',\n\t\t\thorizontalFuture = this.Reveal.getConfig().rtl ? 'past' : 'future';\n\n\t\t// Update the classes of all backgrounds to match the\n\t\t// states of their slides (past/present/future)\n\t\tArray.from( this.element.childNodes ).forEach( ( backgroundh, h ) => {\n\n\t\t\tbackgroundh.classList.remove( 'past', 'present', 'future' );\n\n\t\t\tif( h < indices.h ) {\n\t\t\t\tbackgroundh.classList.add( horizontalPast );\n\t\t\t}\n\t\t\telse if ( h > indices.h ) {\n\t\t\t\tbackgroundh.classList.add( horizontalFuture );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbackgroundh.classList.add( 'present' );\n\n\t\t\t\t// Store a reference to the current background element\n\t\t\t\tcurrentBackground = backgroundh;\n\t\t\t}\n\n\t\t\tif( includeAll || h === indices.h ) {\n\t\t\t\tqueryAll( backgroundh, '.slide-background' ).forEach( ( backgroundv, v ) => {\n\n\t\t\t\t\tbackgroundv.classList.remove( 'past', 'present', 'future' );\n\n\t\t\t\t\tif( v < indices.v ) {\n\t\t\t\t\t\tbackgroundv.classList.add( 'past' );\n\t\t\t\t\t}\n\t\t\t\t\telse if ( v > indices.v ) {\n\t\t\t\t\t\tbackgroundv.classList.add( 'future' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tbackgroundv.classList.add( 'present' );\n\n\t\t\t\t\t\t// Only if this is the present horizontal and vertical slide\n\t\t\t\t\t\tif( h === indices.h ) currentBackground = backgroundv;\n\t\t\t\t\t}\n\n\t\t\t\t} );\n\t\t\t}\n\n\t\t} );\n\n\t\t// Stop content inside of previous backgrounds\n\t\tif( this.previousBackground ) {\n\n\t\t\tthis.Reveal.slideContent.stopEmbeddedContent( this.previousBackground, { unloadIframes: !this.Reveal.slideContent.shouldPreload( this.previousBackground ) } );\n\n\t\t}\n\n\t\t// Start content in the current background\n\t\tif( currentBackground ) {\n\n\t\t\tthis.Reveal.slideContent.startEmbeddedContent( currentBackground );\n\n\t\t\tlet currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );\n\t\t\tif( currentBackgroundContent ) {\n\n\t\t\t\tlet backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';\n\n\t\t\t\t// Restart GIFs (doesn't work in Firefox)\n\t\t\t\tif( /\\.gif/i.test( backgroundImageURL ) ) {\n\t\t\t\t\tcurrentBackgroundContent.style.backgroundImage = '';\n\t\t\t\t\twindow.getComputedStyle( currentBackgroundContent ).opacity;\n\t\t\t\t\tcurrentBackgroundContent.style.backgroundImage = backgroundImageURL;\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\t// Don't transition between identical backgrounds. This\n\t\t\t// prevents unwanted flicker.\n\t\t\tlet previousBackgroundHash = this.previousBackground ? this.previousBackground.getAttribute( 'data-background-hash' ) : null;\n\t\t\tlet currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );\n\t\t\tif( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== this.previousBackground ) {\n\t\t\t\tthis.element.classList.add( 'no-transition' );\n\t\t\t}\n\n\t\t\tthis.previousBackground = currentBackground;\n\n\t\t}\n\n\t\t// If there's a background brightness flag for this slide,\n\t\t// bubble it to the .reveal container\n\t\tif( currentSlide ) {\n\t\t\t[ 'has-light-background', 'has-dark-background' ].forEach( classToBubble => {\n\t\t\t\tif( currentSlide.classList.contains( classToBubble ) ) {\n\t\t\t\t\tthis.Reveal.getRevealElement().classList.add( classToBubble );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.getRevealElement().classList.remove( classToBubble );\n\t\t\t\t}\n\t\t\t}, this );\n\t\t}\n\n\t\t// Allow the first background to apply without transition\n\t\tsetTimeout( () => {\n\t\t\tthis.element.classList.remove( 'no-transition' );\n\t\t}, 1 );\n\n\t}\n\n\t/**\n\t * Updates the position of the parallax background based\n\t * on the current slide index.\n\t */\n\tupdateParallax() {\n\n\t\tlet indices = this.Reveal.getIndices();\n\n\t\tif( this.Reveal.getConfig().parallaxBackgroundImage ) {\n\n\t\t\tlet horizontalSlides = this.Reveal.getHorizontalSlides(),\n\t\t\t\tverticalSlides = this.Reveal.getVerticalSlides();\n\n\t\t\tlet backgroundSize = this.element.style.backgroundSize.split( ' ' ),\n\t\t\t\tbackgroundWidth, backgroundHeight;\n\n\t\t\tif( backgroundSize.length === 1 ) {\n\t\t\t\tbackgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbackgroundWidth = parseInt( backgroundSize[0], 10 );\n\t\t\t\tbackgroundHeight = parseInt( backgroundSize[1], 10 );\n\t\t\t}\n\n\t\t\tlet slideWidth = this.element.offsetWidth,\n\t\t\t\thorizontalSlideCount = horizontalSlides.length,\n\t\t\t\thorizontalOffsetMultiplier,\n\t\t\t\thorizontalOffset;\n\n\t\t\tif( typeof this.Reveal.getConfig().parallaxBackgroundHorizontal === 'number' ) {\n\t\t\t\thorizontalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundHorizontal;\n\t\t\t}\n\t\t\telse {\n\t\t\t\thorizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;\n\t\t\t}\n\n\t\t\thorizontalOffset = horizontalOffsetMultiplier * indices.h * -1;\n\n\t\t\tlet slideHeight = this.element.offsetHeight,\n\t\t\t\tverticalSlideCount = verticalSlides.length,\n\t\t\t\tverticalOffsetMultiplier,\n\t\t\t\tverticalOffset;\n\n\t\t\tif( typeof this.Reveal.getConfig().parallaxBackgroundVertical === 'number' ) {\n\t\t\t\tverticalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundVertical;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tverticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );\n\t\t\t}\n\n\t\t\tverticalOffset = verticalSlideCount > 0 ?  verticalOffsetMultiplier * indices.v : 0;\n\n\t\t\tthis.element.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';\n\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}\n","\nexport const SLIDES_SELECTOR = '.slides section';\nexport const HORIZONTAL_SLIDES_SELECTOR = '.slides>section';\nexport const VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section';\n\n// Methods that may not be invoked via the postMessage API\nexport const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener|showPreview/;\n\n// Regex for retrieving the fragment style from a class attribute\nexport const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;","import { queryAll, extend, createStyleSheet, matches, closest } from '../utils/util.js'\nimport { FRAGMENT_STYLE_REGEX } from '../utils/constants.js'\n\n// Counter used to generate unique IDs for auto-animated elements\nlet autoAnimateCounter = 0;\n\n/**\n * Automatically animates matching elements across\n * slides with the [data-auto-animate] attribute.\n */\nexport default class AutoAnimate {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Runs an auto-animation between the given slides.\n\t *\n\t * @param  {HTMLElement} fromSlide\n\t * @param  {HTMLElement} toSlide\n\t */\n\trun( fromSlide, toSlide ) {\n\n\t\t// Clean up after prior animations\n\t\tthis.reset();\n\n\t\tlet allSlides = this.Reveal.getSlides();\n\t\tlet toSlideIndex = allSlides.indexOf( toSlide );\n\t\tlet fromSlideIndex = allSlides.indexOf( fromSlide );\n\n\t\t// Ensure that both slides are auto-animate targets with the same data-auto-animate-id value\n\t\t// (including null if absent on both) and that data-auto-animate-restart isn't set on the\n\t\t// physically latter slide (independent of slide direction)\n\t\tif( fromSlide.hasAttribute( 'data-auto-animate' ) && toSlide.hasAttribute( 'data-auto-animate' )\n\t\t\t\t&& fromSlide.getAttribute( 'data-auto-animate-id' ) === toSlide.getAttribute( 'data-auto-animate-id' ) \n\t\t\t\t&& !( toSlideIndex > fromSlideIndex ? toSlide : fromSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {\n\n\t\t\t// Create a new auto-animate sheet\n\t\t\tthis.autoAnimateStyleSheet = this.autoAnimateStyleSheet || createStyleSheet();\n\n\t\t\tlet animationOptions = this.getAutoAnimateOptions( toSlide );\n\n\t\t\t// Set our starting state\n\t\t\tfromSlide.dataset.autoAnimate = 'pending';\n\t\t\ttoSlide.dataset.autoAnimate = 'pending';\n\n\t\t\t// Flag the navigation direction, needed for fragment buildup\n\t\t\tanimationOptions.slideDirection = toSlideIndex > fromSlideIndex ? 'forward' : 'backward';\n\n\t\t\t// If the from-slide is hidden because it has moved outside\n\t\t\t// the view distance, we need to temporarily show it while\n\t\t\t// measuring\n\t\t\tlet fromSlideIsHidden = fromSlide.style.display === 'none';\n\t\t\tif( fromSlideIsHidden ) fromSlide.style.display = this.Reveal.getConfig().display;\n\n\t\t\t// Inject our auto-animate styles for this transition\n\t\t\tlet css = this.getAutoAnimatableElements( fromSlide, toSlide ).map( elements => {\n\t\t\t\treturn this.autoAnimateElements( elements.from, elements.to, elements.options || {}, animationOptions, autoAnimateCounter++ );\n\t\t\t} );\n\n\t\t\tif( fromSlideIsHidden ) fromSlide.style.display = 'none';\n\n\t\t\t// Animate unmatched elements, if enabled\n\t\t\tif( toSlide.dataset.autoAnimateUnmatched !== 'false' && this.Reveal.getConfig().autoAnimateUnmatched === true ) {\n\n\t\t\t\t// Our default timings for unmatched elements\n\t\t\t\tlet defaultUnmatchedDuration = animationOptions.duration * 0.8,\n\t\t\t\t\tdefaultUnmatchedDelay = animationOptions.duration * 0.2;\n\n\t\t\t\tthis.getUnmatchedAutoAnimateElements( toSlide ).forEach( unmatchedElement => {\n\n\t\t\t\t\tlet unmatchedOptions = this.getAutoAnimateOptions( unmatchedElement, animationOptions );\n\t\t\t\t\tlet id = 'unmatched';\n\n\t\t\t\t\t// If there is a duration or delay set specifically for this\n\t\t\t\t\t// element our unmatched elements should adhere to those\n\t\t\t\t\tif( unmatchedOptions.duration !== animationOptions.duration || unmatchedOptions.delay !== animationOptions.delay ) {\n\t\t\t\t\t\tid = 'unmatched-' + autoAnimateCounter++;\n\t\t\t\t\t\tcss.push( `[data-auto-animate=\"running\"] [data-auto-animate-target=\"${id}\"] { transition: opacity ${unmatchedOptions.duration}s ease ${unmatchedOptions.delay}s; }` );\n\t\t\t\t\t}\n\n\t\t\t\t\tunmatchedElement.dataset.autoAnimateTarget = id;\n\n\t\t\t\t}, this );\n\n\t\t\t\t// Our default transition for unmatched elements\n\t\t\t\tcss.push( `[data-auto-animate=\"running\"] [data-auto-animate-target=\"unmatched\"] { transition: opacity ${defaultUnmatchedDuration}s ease ${defaultUnmatchedDelay}s; }` );\n\n\t\t\t}\n\n\t\t\t// Setting the whole chunk of CSS at once is the most\n\t\t\t// efficient way to do this. Using sheet.insertRule\n\t\t\t// is multiple factors slower.\n\t\t\tthis.autoAnimateStyleSheet.innerHTML = css.join( '' );\n\n\t\t\t// Start the animation next cycle\n\t\t\trequestAnimationFrame( () => {\n\t\t\t\tif( this.autoAnimateStyleSheet ) {\n\t\t\t\t\t// This forces our newly injected styles to be applied in Firefox\n\t\t\t\t\tgetComputedStyle( this.autoAnimateStyleSheet ).fontWeight;\n\n\t\t\t\t\ttoSlide.dataset.autoAnimate = 'running';\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'autoanimate',\n\t\t\t\tdata: {\n\t\t\t\t\tfromSlide,\n\t\t\t\t\ttoSlide,\n\t\t\t\t\tsheet: this.autoAnimateStyleSheet\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Rolls back all changes that we've made to the DOM so\n\t * that as part of animating.\n\t */\n\treset() {\n\n\t\t// Reset slides\n\t\tqueryAll( this.Reveal.getRevealElement(), '[data-auto-animate]:not([data-auto-animate=\"\"])' ).forEach( element => {\n\t\t\telement.dataset.autoAnimate = '';\n\t\t} );\n\n\t\t// Reset elements\n\t\tqueryAll( this.Reveal.getRevealElement(), '[data-auto-animate-target]' ).forEach( element => {\n\t\t\tdelete element.dataset.autoAnimateTarget;\n\t\t} );\n\n\t\t// Remove the animation sheet\n\t\tif( this.autoAnimateStyleSheet && this.autoAnimateStyleSheet.parentNode ) {\n\t\t\tthis.autoAnimateStyleSheet.parentNode.removeChild( this.autoAnimateStyleSheet );\n\t\t\tthis.autoAnimateStyleSheet = null;\n\t\t}\n\n\t}\n\n\t/**\n\t * Creates a FLIP animation where the `to` element starts out\n\t * in the `from` element position and animates to its original\n\t * state.\n\t *\n\t * @param {HTMLElement} from\n\t * @param {HTMLElement} to\n\t * @param {Object} elementOptions Options for this element pair\n\t * @param {Object} animationOptions Options set at the slide level\n\t * @param {String} id Unique ID that we can use to identify this\n\t * auto-animate element in the DOM\n\t */\n\tautoAnimateElements( from, to, elementOptions, animationOptions, id ) {\n\n\t\t// 'from' elements are given a data-auto-animate-target with no value,\n\t\t// 'to' elements are are given a data-auto-animate-target with an ID\n\t\tfrom.dataset.autoAnimateTarget = '';\n\t\tto.dataset.autoAnimateTarget = id;\n\n\t\t// Each element may override any of the auto-animate options\n\t\t// like transition easing, duration and delay via data-attributes\n\t\tlet options = this.getAutoAnimateOptions( to, animationOptions );\n\n\t\t// If we're using a custom element matcher the element options\n\t\t// may contain additional transition overrides\n\t\tif( typeof elementOptions.delay !== 'undefined' ) options.delay = elementOptions.delay;\n\t\tif( typeof elementOptions.duration !== 'undefined' ) options.duration = elementOptions.duration;\n\t\tif( typeof elementOptions.easing !== 'undefined' ) options.easing = elementOptions.easing;\n\n\t\tlet fromProps = this.getAutoAnimatableProperties( 'from', from, elementOptions ),\n\t\t\ttoProps = this.getAutoAnimatableProperties( 'to', to, elementOptions );\n\n\t\t// Maintain fragment visibility for matching elements when\n\t\t// we're navigating forwards, this way the viewer won't need\n\t\t// to step through the same fragments twice\n\t\tif( to.classList.contains( 'fragment' ) ) {\n\n\t\t\t// Don't auto-animate the opacity of fragments to avoid\n\t\t\t// conflicts with fragment animations\n\t\t\tdelete toProps.styles['opacity'];\n\n\t\t\tif( from.classList.contains( 'fragment' ) ) {\n\n\t\t\t\tlet fromFragmentStyle = ( from.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];\n\t\t\t\tlet toFragmentStyle = ( to.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];\n\n\t\t\t\t// Only skip the fragment if the fragment animation style\n\t\t\t\t// remains unchanged\n\t\t\t\tif( fromFragmentStyle === toFragmentStyle && animationOptions.slideDirection === 'forward' ) {\n\t\t\t\t\tto.classList.add( 'visible', 'disabled' );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t// If translation and/or scaling are enabled, css transform\n\t\t// the 'to' element so that it matches the position and size\n\t\t// of the 'from' element\n\t\tif( elementOptions.translate !== false || elementOptions.scale !== false ) {\n\n\t\t\tlet presentationScale = this.Reveal.getScale();\n\n\t\t\tlet delta = {\n\t\t\t\tx: ( fromProps.x - toProps.x ) / presentationScale,\n\t\t\t\ty: ( fromProps.y - toProps.y ) / presentationScale,\n\t\t\t\tscaleX: fromProps.width / toProps.width,\n\t\t\t\tscaleY: fromProps.height / toProps.height\n\t\t\t};\n\n\t\t\t// Limit decimal points to avoid 0.0001px blur and stutter\n\t\t\tdelta.x = Math.round( delta.x * 1000 ) / 1000;\n\t\t\tdelta.y = Math.round( delta.y * 1000 ) / 1000;\n\t\t\tdelta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;\n\t\t\tdelta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;\n\n\t\t\tlet translate = elementOptions.translate !== false && ( delta.x !== 0 || delta.y !== 0 ),\n\t\t\t\tscale = elementOptions.scale !== false && ( delta.scaleX !== 0 || delta.scaleY !== 0 );\n\n\t\t\t// No need to transform if nothing's changed\n\t\t\tif( translate || scale ) {\n\n\t\t\t\tlet transform = [];\n\n\t\t\t\tif( translate ) transform.push( `translate(${delta.x}px, ${delta.y}px)` );\n\t\t\t\tif( scale ) transform.push( `scale(${delta.scaleX}, ${delta.scaleY})` );\n\n\t\t\t\tfromProps.styles['transform'] = transform.join( ' ' );\n\t\t\t\tfromProps.styles['transform-origin'] = 'top left';\n\n\t\t\t\ttoProps.styles['transform'] = 'none';\n\n\t\t\t}\n\n\t\t}\n\n\t\t// Delete all unchanged 'to' styles\n\t\tfor( let propertyName in toProps.styles ) {\n\t\t\tconst toValue = toProps.styles[propertyName];\n\t\t\tconst fromValue = fromProps.styles[propertyName];\n\n\t\t\tif( toValue === fromValue ) {\n\t\t\t\tdelete toProps.styles[propertyName];\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// If these property values were set via a custom matcher providing\n\t\t\t\t// an explicit 'from' and/or 'to' value, we always inject those values.\n\t\t\t\tif( toValue.explicitValue === true ) {\n\t\t\t\t\ttoProps.styles[propertyName] = toValue.value;\n\t\t\t\t}\n\n\t\t\t\tif( fromValue.explicitValue === true ) {\n\t\t\t\t\tfromProps.styles[propertyName] = fromValue.value;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tlet css = '';\n\n\t\tlet toStyleProperties = Object.keys( toProps.styles );\n\n\t\t// Only create animate this element IF at least one style\n\t\t// property has changed\n\t\tif( toStyleProperties.length > 0 ) {\n\n\t\t\t// Instantly move to the 'from' state\n\t\t\tfromProps.styles['transition'] = 'none';\n\n\t\t\t// Animate towards the 'to' state\n\t\t\ttoProps.styles['transition'] = `all ${options.duration}s ${options.easing} ${options.delay}s`;\n\t\t\ttoProps.styles['transition-property'] = toStyleProperties.join( ', ' );\n\t\t\ttoProps.styles['will-change'] = toStyleProperties.join( ', ' );\n\n\t\t\t// Build up our custom CSS. We need to override inline styles\n\t\t\t// so we need to make our styles vErY IMPORTANT!1!!\n\t\t\tlet fromCSS = Object.keys( fromProps.styles ).map( propertyName => {\n\t\t\t\treturn propertyName + ': ' + fromProps.styles[propertyName] + ' !important;';\n\t\t\t} ).join( '' );\n\n\t\t\tlet toCSS = Object.keys( toProps.styles ).map( propertyName => {\n\t\t\t\treturn propertyName + ': ' + toProps.styles[propertyName] + ' !important;';\n\t\t\t} ).join( '' );\n\n\t\t\tcss = \t'[data-auto-animate-target=\"'+ id +'\"] {'+ fromCSS +'}' +\n\t\t\t\t\t'[data-auto-animate=\"running\"] [data-auto-animate-target=\"'+ id +'\"] {'+ toCSS +'}';\n\n\t\t}\n\n\t\treturn css;\n\n\t}\n\n\t/**\n\t * Returns the auto-animate options for the given element.\n\t *\n\t * @param {HTMLElement} element Element to pick up options\n\t * from, either a slide or an animation target\n\t * @param {Object} [inheritedOptions] Optional set of existing\n\t * options\n\t */\n\tgetAutoAnimateOptions( element, inheritedOptions ) {\n\n\t\tlet options = {\n\t\t\teasing: this.Reveal.getConfig().autoAnimateEasing,\n\t\t\tduration: this.Reveal.getConfig().autoAnimateDuration,\n\t\t\tdelay: 0\n\t\t};\n\n\t\toptions = extend( options, inheritedOptions );\n\n\t\t// Inherit options from parent elements\n\t\tif( element.parentNode ) {\n\t\t\tlet autoAnimatedParent = closest( element.parentNode, '[data-auto-animate-target]' );\n\t\t\tif( autoAnimatedParent ) {\n\t\t\t\toptions = this.getAutoAnimateOptions( autoAnimatedParent, options );\n\t\t\t}\n\t\t}\n\n\t\tif( element.dataset.autoAnimateEasing ) {\n\t\t\toptions.easing = element.dataset.autoAnimateEasing;\n\t\t}\n\n\t\tif( element.dataset.autoAnimateDuration ) {\n\t\t\toptions.duration = parseFloat( element.dataset.autoAnimateDuration );\n\t\t}\n\n\t\tif( element.dataset.autoAnimateDelay ) {\n\t\t\toptions.delay = parseFloat( element.dataset.autoAnimateDelay );\n\t\t}\n\n\t\treturn options;\n\n\t}\n\n\t/**\n\t * Returns an object containing all of the properties\n\t * that can be auto-animated for the given element and\n\t * their current computed values.\n\t *\n\t * @param {String} direction 'from' or 'to'\n\t */\n\tgetAutoAnimatableProperties( direction, element, elementOptions ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\tlet properties = { styles: [] };\n\n\t\t// Position and size\n\t\tif( elementOptions.translate !== false || elementOptions.scale !== false ) {\n\t\t\tlet bounds;\n\n\t\t\t// Custom auto-animate may optionally return a custom tailored\n\t\t\t// measurement function\n\t\t\tif( typeof elementOptions.measure === 'function' ) {\n\t\t\t\tbounds = elementOptions.measure( element );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif( config.center ) {\n\t\t\t\t\t// More precise, but breaks when used in combination\n\t\t\t\t\t// with zoom for scaling the deck ¯\\_(ツ)_/¯\n\t\t\t\t\tbounds = element.getBoundingClientRect();\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tlet scale = this.Reveal.getScale();\n\t\t\t\t\tbounds = {\n\t\t\t\t\t\tx: element.offsetLeft * scale,\n\t\t\t\t\t\ty: element.offsetTop * scale,\n\t\t\t\t\t\twidth: element.offsetWidth * scale,\n\t\t\t\t\t\theight: element.offsetHeight * scale\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tproperties.x = bounds.x;\n\t\t\tproperties.y = bounds.y;\n\t\t\tproperties.width = bounds.width;\n\t\t\tproperties.height = bounds.height;\n\t\t}\n\n\t\tconst computedStyles = getComputedStyle( element );\n\n\t\t// CSS styles\n\t\t( elementOptions.styles || config.autoAnimateStyles ).forEach( style => {\n\t\t\tlet value;\n\n\t\t\t// `style` is either the property name directly, or an object\n\t\t\t// definition of a style property\n\t\t\tif( typeof style === 'string' ) style = { property: style };\n\n\t\t\tif( typeof style.from !== 'undefined' && direction === 'from' ) {\n\t\t\t\tvalue = { value: style.from, explicitValue: true };\n\t\t\t}\n\t\t\telse if( typeof style.to !== 'undefined' && direction === 'to' ) {\n\t\t\t\tvalue = { value: style.to, explicitValue: true };\n\t\t\t}\n\t\t\telse {\n\t\t\t\tvalue = computedStyles[style.property];\n\t\t\t}\n\n\t\t\tif( value !== '' ) {\n\t\t\t\tproperties.styles[style.property] = value;\n\t\t\t}\n\t\t} );\n\n\t\treturn properties;\n\n\t}\n\n\t/**\n\t * Get a list of all element pairs that we can animate\n\t * between the given slides.\n\t *\n\t * @param {HTMLElement} fromSlide\n\t * @param {HTMLElement} toSlide\n\t *\n\t * @return {Array} Each value is an array where [0] is\n\t * the element we're animating from and [1] is the\n\t * element we're animating to\n\t */\n\tgetAutoAnimatableElements( fromSlide, toSlide ) {\n\n\t\tlet matcher = typeof this.Reveal.getConfig().autoAnimateMatcher === 'function' ? this.Reveal.getConfig().autoAnimateMatcher : this.getAutoAnimatePairs;\n\n\t\tlet pairs = matcher.call( this, fromSlide, toSlide );\n\n\t\tlet reserved = [];\n\n\t\t// Remove duplicate pairs\n\t\treturn pairs.filter( ( pair, index ) => {\n\t\t\tif( reserved.indexOf( pair.to ) === -1 ) {\n\t\t\t\treserved.push( pair.to );\n\t\t\t\treturn true;\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Identifies matching elements between slides.\n\t *\n\t * You can specify a custom matcher function by using\n\t * the `autoAnimateMatcher` config option.\n\t */\n\tgetAutoAnimatePairs( fromSlide, toSlide ) {\n\n\t\tlet pairs = [];\n\n\t\tconst codeNodes = 'pre';\n\t\tconst textNodes = 'h1, h2, h3, h4, h5, h6, p, li';\n\t\tconst mediaNodes = 'img, video, iframe';\n\n\t\t// Eplicit matches via data-id\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', node => {\n\t\t\treturn node.nodeName + ':::' + node.getAttribute( 'data-id' );\n\t\t} );\n\n\t\t// Text\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, textNodes, node => {\n\t\t\treturn node.nodeName + ':::' + node.innerText;\n\t\t} );\n\n\t\t// Media\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, mediaNodes, node => {\n\t\t\treturn node.nodeName + ':::' + ( node.getAttribute( 'src' ) || node.getAttribute( 'data-src' ) );\n\t\t} );\n\n\t\t// Code\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, codeNodes, node => {\n\t\t\treturn node.nodeName + ':::' + node.innerText;\n\t\t} );\n\n\t\tpairs.forEach( pair => {\n\n\t\t\t// Disable scale transformations on text nodes, we transition\n\t\t\t// each individual text property instead\n\t\t\tif( matches( pair.from, textNodes ) ) {\n\t\t\t\tpair.options = { scale: false };\n\t\t\t}\n\t\t\t// Animate individual lines of code\n\t\t\telse if( matches( pair.from, codeNodes ) ) {\n\n\t\t\t\t// Transition the code block's width and height instead of scaling\n\t\t\t\t// to prevent its content from being squished\n\t\t\t\tpair.options = { scale: false, styles: [ 'width', 'height' ] };\n\n\t\t\t\t// Lines of code\n\t\t\t\tthis.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-code', node => {\n\t\t\t\t\treturn node.textContent;\n\t\t\t\t}, {\n\t\t\t\t\tscale: false,\n\t\t\t\t\tstyles: [],\n\t\t\t\t\tmeasure: this.getLocalBoundingBox.bind( this )\n\t\t\t\t} );\n\n\t\t\t\t// Line numbers\n\t\t\t\tthis.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-line[data-line-number]', node => {\n\t\t\t\t\treturn node.getAttribute( 'data-line-number' );\n\t\t\t\t}, {\n\t\t\t\t\tscale: false,\n\t\t\t\t\tstyles: [ 'width' ],\n\t\t\t\t\tmeasure: this.getLocalBoundingBox.bind( this )\n\t\t\t\t} );\n\n\t\t\t}\n\n\t\t}, this );\n\n\t\treturn pairs;\n\n\t}\n\n\t/**\n\t * Helper method which returns a bounding box based on\n\t * the given elements offset coordinates.\n\t *\n\t * @param {HTMLElement} element\n\t * @return {Object} x, y, width, height\n\t */\n\tgetLocalBoundingBox( element ) {\n\n\t\tconst presentationScale = this.Reveal.getScale();\n\n\t\treturn {\n\t\t\tx: Math.round( ( element.offsetLeft * presentationScale ) * 100 ) / 100,\n\t\t\ty: Math.round( ( element.offsetTop * presentationScale ) * 100 ) / 100,\n\t\t\twidth: Math.round( ( element.offsetWidth * presentationScale ) * 100 ) / 100,\n\t\t\theight: Math.round( ( element.offsetHeight * presentationScale ) * 100 ) / 100\n\t\t};\n\n\t}\n\n\t/**\n\t * Finds matching elements between two slides.\n\t *\n\t * @param {Array} pairs            \tList of pairs to push matches to\n\t * @param {HTMLElement} fromScope   Scope within the from element exists\n\t * @param {HTMLElement} toScope     Scope within the to element exists\n\t * @param {String} selector         CSS selector of the element to match\n\t * @param {Function} serializer     A function that accepts an element and returns\n\t *                                  a stringified ID based on its contents\n\t * @param {Object} animationOptions Optional config options for this pair\n\t */\n\tfindAutoAnimateMatches( pairs, fromScope, toScope, selector, serializer, animationOptions ) {\n\n\t\tlet fromMatches = {};\n\t\tlet toMatches = {};\n\n\t\t[].slice.call( fromScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {\n\t\t\tconst key = serializer( element );\n\t\t\tif( typeof key === 'string' && key.length ) {\n\t\t\t\tfromMatches[key] = fromMatches[key] || [];\n\t\t\t\tfromMatches[key].push( element );\n\t\t\t}\n\t\t} );\n\n\t\t[].slice.call( toScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {\n\t\t\tconst key = serializer( element );\n\t\t\ttoMatches[key] = toMatches[key] || [];\n\t\t\ttoMatches[key].push( element );\n\n\t\t\tlet fromElement;\n\n\t\t\t// Retrieve the 'from' element\n\t\t\tif( fromMatches[key] ) {\n\t\t\t\tconst pimaryIndex = toMatches[key].length - 1;\n\t\t\t\tconst secondaryIndex = fromMatches[key].length - 1;\n\n\t\t\t\t// If there are multiple identical from elements, retrieve\n\t\t\t\t// the one at the same index as our to-element.\n\t\t\t\tif( fromMatches[key][ pimaryIndex ] ) {\n\t\t\t\t\tfromElement = fromMatches[key][ pimaryIndex ];\n\t\t\t\t\tfromMatches[key][ pimaryIndex ] = null;\n\t\t\t\t}\n\t\t\t\t// If there are no matching from-elements at the same index,\n\t\t\t\t// use the last one.\n\t\t\t\telse if( fromMatches[key][ secondaryIndex ] ) {\n\t\t\t\t\tfromElement = fromMatches[key][ secondaryIndex ];\n\t\t\t\t\tfromMatches[key][ secondaryIndex ] = null;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If we've got a matching pair, push it to the list of pairs\n\t\t\tif( fromElement ) {\n\t\t\t\tpairs.push({\n\t\t\t\t\tfrom: fromElement,\n\t\t\t\t\tto: element,\n\t\t\t\t\toptions: animationOptions\n\t\t\t\t});\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Returns a all elements within the given scope that should\n\t * be considered unmatched in an auto-animate transition. If\n\t * fading of unmatched elements is turned on, these elements\n\t * will fade when going between auto-animate slides.\n\t *\n\t * Note that parents of auto-animate targets are NOT considerd\n\t * unmatched since fading them would break the auto-animation.\n\t *\n\t * @param {HTMLElement} rootElement\n\t * @return {Array}\n\t */\n\tgetUnmatchedAutoAnimateElements( rootElement ) {\n\n\t\treturn [].slice.call( rootElement.children ).reduce( ( result, element ) => {\n\n\t\t\tconst containsAnimatedElements = element.querySelector( '[data-auto-animate-target]' );\n\n\t\t\t// The element is unmatched if\n\t\t\t// - It is not an auto-animate target\n\t\t\t// - It does not contain any auto-animate targets\n\t\t\tif( !element.hasAttribute( 'data-auto-animate-target' ) && !containsAnimatedElements ) {\n\t\t\t\tresult.push( element );\n\t\t\t}\n\n\t\t\tif( element.querySelector( '[data-auto-animate-target]' ) ) {\n\t\t\t\tresult = result.concat( this.getUnmatchedAutoAnimateElements( element ) );\n\t\t\t}\n\n\t\t\treturn result;\n\n\t\t}, [] );\n\n\t}\n\n}\n","import { extend, queryAll } from '../utils/util.js'\n\n/**\n * Handles sorting and navigation of slide fragments.\n * Fragments are elements within a slide that are\n * revealed/animated incrementally.\n */\nexport default class Fragments {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.fragments === false ) {\n\t\t\tthis.disable();\n\t\t}\n\t\telse if( oldConfig.fragments === false ) {\n\t\t\tthis.enable();\n\t\t}\n\n\t}\n\n\t/**\n\t * If fragments are disabled in the deck, they should all be\n\t * visible rather than stepped through.\n\t */\n\tdisable() {\n\n\t\tqueryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {\n\t\t\telement.classList.add( 'visible' );\n\t\t\telement.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Reverse of #disable(). Only called if fragments have\n\t * previously been disabled.\n\t */\n\tenable() {\n\n\t\tqueryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {\n\t\t\telement.classList.remove( 'visible' );\n\t\t\telement.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Returns an object describing the available fragment\n\t * directions.\n\t *\n\t * @return {{prev: boolean, next: boolean}}\n\t */\n\tavailableRoutes() {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\t\t\tlet fragments = currentSlide.querySelectorAll( '.fragment:not(.disabled)' );\n\t\t\tlet hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.disabled):not(.visible)' );\n\n\t\t\treturn {\n\t\t\t\tprev: fragments.length - hiddenFragments.length > 0,\n\t\t\t\tnext: !!hiddenFragments.length\n\t\t\t};\n\t\t}\n\t\telse {\n\t\t\treturn { prev: false, next: false };\n\t\t}\n\n\t}\n\n\t/**\n\t * Return a sorted fragments list, ordered by an increasing\n\t * \"data-fragment-index\" attribute.\n\t *\n\t * Fragments will be revealed in the order that they are returned by\n\t * this function, so you can use the index attributes to control the\n\t * order of fragment appearance.\n\t *\n\t * To maintain a sensible default fragment order, fragments are presumed\n\t * to be passed in document order. This function adds a \"fragment-index\"\n\t * attribute to each node if such an attribute is not already present,\n\t * and sets that attribute to an integer value which is the position of\n\t * the fragment within the fragments list.\n\t *\n\t * @param {object[]|*} fragments\n\t * @param {boolean} grouped If true the returned array will contain\n\t * nested arrays for all fragments with the same index\n\t * @return {object[]} sorted Sorted array of fragments\n\t */\n\tsort( fragments, grouped = false ) {\n\n\t\tfragments = Array.from( fragments );\n\n\t\tlet ordered = [],\n\t\t\tunordered = [],\n\t\t\tsorted = [];\n\n\t\t// Group ordered and unordered elements\n\t\tfragments.forEach( fragment => {\n\t\t\tif( fragment.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\tlet index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );\n\n\t\t\t\tif( !ordered[index] ) {\n\t\t\t\t\tordered[index] = [];\n\t\t\t\t}\n\n\t\t\t\tordered[index].push( fragment );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tunordered.push( [ fragment ] );\n\t\t\t}\n\t\t} );\n\n\t\t// Append fragments without explicit indices in their\n\t\t// DOM order\n\t\tordered = ordered.concat( unordered );\n\n\t\t// Manually count the index up per group to ensure there\n\t\t// are no gaps\n\t\tlet index = 0;\n\n\t\t// Push all fragments in their sorted order to an array,\n\t\t// this flattens the groups\n\t\tordered.forEach( group => {\n\t\t\tgroup.forEach( fragment => {\n\t\t\t\tsorted.push( fragment );\n\t\t\t\tfragment.setAttribute( 'data-fragment-index', index );\n\t\t\t} );\n\n\t\t\tindex ++;\n\t\t} );\n\n\t\treturn grouped === true ? ordered : sorted;\n\n\t}\n\n\t/**\n\t * Sorts and formats all of fragments in the\n\t * presentation.\n\t */\n\tsortAll() {\n\n\t\tthis.Reveal.getHorizontalSlides().forEach( horizontalSlide => {\n\n\t\t\tlet verticalSlides = queryAll( horizontalSlide, 'section' );\n\t\t\tverticalSlides.forEach( ( verticalSlide, y ) => {\n\n\t\t\t\tthis.sort( verticalSlide.querySelectorAll( '.fragment' ) );\n\n\t\t\t}, this );\n\n\t\t\tif( verticalSlides.length === 0 ) this.sort( horizontalSlide.querySelectorAll( '.fragment' ) );\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Refreshes the fragments on the current slide so that they\n\t * have the appropriate classes (.visible + .current-fragment).\n\t *\n\t * @param {number} [index] The index of the current fragment\n\t * @param {array} [fragments] Array containing all fragments\n\t * in the current slide\n\t *\n\t * @return {{shown: array, hidden: array}}\n\t */\n\tupdate( index, fragments ) {\n\n\t\tlet changedFragments = {\n\t\t\tshown: [],\n\t\t\thidden: []\n\t\t};\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\n\t\t\tfragments = fragments || this.sort( currentSlide.querySelectorAll( '.fragment' ) );\n\n\t\t\tif( fragments.length ) {\n\n\t\t\t\tlet maxIndex = 0;\n\n\t\t\t\tif( typeof index !== 'number' ) {\n\t\t\t\t\tlet currentFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();\n\t\t\t\t\tif( currentFragment ) {\n\t\t\t\t\t\tindex = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tArray.from( fragments ).forEach( ( el, i ) => {\n\n\t\t\t\t\tif( el.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\t\t\ti = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );\n\t\t\t\t\t}\n\n\t\t\t\t\tmaxIndex = Math.max( maxIndex, i );\n\n\t\t\t\t\t// Visible fragments\n\t\t\t\t\tif( i <= index ) {\n\t\t\t\t\t\tlet wasVisible = el.classList.contains( 'visible' )\n\t\t\t\t\t\tel.classList.add( 'visible' );\n\t\t\t\t\t\tel.classList.remove( 'current-fragment' );\n\n\t\t\t\t\t\tif( i === index ) {\n\t\t\t\t\t\t\t// Announce the fragments one by one to the Screen Reader\n\t\t\t\t\t\t\tthis.Reveal.announceStatus( this.Reveal.getStatusText( el ) );\n\n\t\t\t\t\t\t\tel.classList.add( 'current-fragment' );\n\t\t\t\t\t\t\tthis.Reveal.slideContent.startEmbeddedContent( el );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tif( !wasVisible ) {\n\t\t\t\t\t\t\tchangedFragments.shown.push( el )\n\t\t\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\t\t\ttarget: el,\n\t\t\t\t\t\t\t\ttype: 'visible',\n\t\t\t\t\t\t\t\tbubbles: false\n\t\t\t\t\t\t\t});\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\t// Hidden fragments\n\t\t\t\t\telse {\n\t\t\t\t\t\tlet wasVisible = el.classList.contains( 'visible' )\n\t\t\t\t\t\tel.classList.remove( 'visible' );\n\t\t\t\t\t\tel.classList.remove( 'current-fragment' );\n\n\t\t\t\t\t\tif( wasVisible ) {\n\t\t\t\t\t\t\tthis.Reveal.slideContent.stopEmbeddedContent( el );\n\t\t\t\t\t\t\tchangedFragments.hidden.push( el );\n\t\t\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\t\t\ttarget: el,\n\t\t\t\t\t\t\t\ttype: 'hidden',\n\t\t\t\t\t\t\t\tbubbles: false\n\t\t\t\t\t\t\t});\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t} );\n\n\t\t\t\t// Write the current fragment index to the slide <section>.\n\t\t\t\t// This can be used by end users to apply styles based on\n\t\t\t\t// the current fragment index.\n\t\t\t\tindex = typeof index === 'number' ? index : -1;\n\t\t\t\tindex = Math.max( Math.min( index, maxIndex ), -1 );\n\t\t\t\tcurrentSlide.setAttribute( 'data-fragment', index );\n\n\t\t\t}\n\n\t\t}\n\n\t\treturn changedFragments;\n\n\t}\n\n\t/**\n\t * Formats the fragments on the given slide so that they have\n\t * valid indices. Call this if fragments are changed in the DOM\n\t * after reveal.js has already initialized.\n\t *\n\t * @param {HTMLElement} slide\n\t * @return {Array} a list of the HTML fragments that were synced\n\t */\n\tsync( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\treturn this.sort( slide.querySelectorAll( '.fragment' ) );\n\n\t}\n\n\t/**\n\t * Navigate to the specified slide fragment.\n\t *\n\t * @param {?number} index The index of the fragment that\n\t * should be shown, -1 means all are invisible\n\t * @param {number} offset Integer offset to apply to the\n\t * fragment index\n\t *\n\t * @return {boolean} true if a change was made in any\n\t * fragments visibility as part of this call\n\t */\n\tgoto( index, offset = 0 ) {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\n\t\t\tlet fragments = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled)' ) );\n\t\t\tif( fragments.length ) {\n\n\t\t\t\t// If no index is specified, find the current\n\t\t\t\tif( typeof index !== 'number' ) {\n\t\t\t\t\tlet lastVisibleFragment = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled).visible' ) ).pop();\n\n\t\t\t\t\tif( lastVisibleFragment ) {\n\t\t\t\t\t\tindex = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tindex = -1;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Apply the offset if there is one\n\t\t\t\tindex += offset;\n\n\t\t\t\tlet changedFragments = this.update( index, fragments );\n\n\t\t\t\tif( changedFragments.hidden.length ) {\n\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\ttype: 'fragmenthidden',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\tfragment: changedFragments.hidden[0],\n\t\t\t\t\t\t\tfragments: changedFragments.hidden\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tif( changedFragments.shown.length ) {\n\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\ttype: 'fragmentshown',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\tfragment: changedFragments.shown[0],\n\t\t\t\t\t\t\tfragments: changedFragments.shown\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tthis.Reveal.controls.update();\n\t\t\t\tthis.Reveal.progress.update();\n\n\t\t\t\tif( this.Reveal.getConfig().fragmentInURL ) {\n\t\t\t\t\tthis.Reveal.location.writeURL();\n\t\t\t\t}\n\n\t\t\t\treturn !!( changedFragments.shown.length || changedFragments.hidden.length );\n\n\t\t\t}\n\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Navigate to the next slide fragment.\n\t *\n\t * @return {boolean} true if there was a next fragment,\n\t * false otherwise\n\t */\n\tnext() {\n\n\t\treturn this.goto( null, 1 );\n\n\t}\n\n\t/**\n\t * Navigate to the previous slide fragment.\n\t *\n\t * @return {boolean} true if there was a previous fragment,\n\t * false otherwise\n\t */\n\tprev() {\n\n\t\treturn this.goto( null, -1 );\n\n\t}\n\n}","import { SLIDES_SELECTOR } from '../utils/constants.js'\nimport { extend, queryAll, transformElement } from '../utils/util.js'\n\n/**\n * Handles all logic related to the overview mode\n * (birds-eye view of all slides).\n */\nexport default class Overview {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.active = false;\n\n\t\tthis.onSlideClicked = this.onSlideClicked.bind( this );\n\n\t}\n\n\t/**\n\t * Displays the overview of slides (quick nav) by scaling\n\t * down and arranging all slide elements.\n\t */\n\tactivate() {\n\n\t\t// Only proceed if enabled in config\n\t\tif( this.Reveal.getConfig().overview && !this.isActive() ) {\n\n\t\t\tthis.active = true;\n\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'overview' );\n\n\t\t\t// Don't auto-slide while in overview mode\n\t\t\tthis.Reveal.cancelAutoSlide();\n\n\t\t\t// Move the backgrounds element into the slide container to\n\t\t\t// that the same scaling is applied\n\t\t\tthis.Reveal.getSlidesElement().appendChild( this.Reveal.getBackgroundsElement() );\n\n\t\t\t// Clicking on an overview slide navigates to it\n\t\t\tqueryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {\n\t\t\t\tif( !slide.classList.contains( 'stack' ) ) {\n\t\t\t\t\tslide.addEventListener( 'click', this.onSlideClicked, true );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Calculate slide sizes\n\t\t\tconst margin = 70;\n\t\t\tconst slideSize = this.Reveal.getComputedSlideSize();\n\t\t\tthis.overviewSlideWidth = slideSize.width + margin;\n\t\t\tthis.overviewSlideHeight = slideSize.height + margin;\n\n\t\t\t// Reverse in RTL mode\n\t\t\tif( this.Reveal.getConfig().rtl ) {\n\t\t\t\tthis.overviewSlideWidth = -this.overviewSlideWidth;\n\t\t\t}\n\n\t\t\tthis.Reveal.updateSlidesVisibility();\n\n\t\t\tthis.layout();\n\t\t\tthis.update();\n\n\t\t\tthis.Reveal.layout();\n\n\t\t\tconst indices = this.Reveal.getIndices();\n\n\t\t\t// Notify observers of the overview showing\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'overviewshown',\n\t\t\t\tdata: {\n\t\t\t\t\t'indexh': indices.h,\n\t\t\t\t\t'indexv': indices.v,\n\t\t\t\t\t'currentSlide': this.Reveal.getCurrentSlide()\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Uses CSS transforms to position all slides in a grid for\n\t * display inside of the overview mode.\n\t */\n\tlayout() {\n\n\t\t// Layout slides\n\t\tthis.Reveal.getHorizontalSlides().forEach( ( hslide, h ) => {\n\t\t\thslide.setAttribute( 'data-index-h', h );\n\t\t\ttransformElement( hslide, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );\n\n\t\t\tif( hslide.classList.contains( 'stack' ) ) {\n\n\t\t\t\tqueryAll( hslide, 'section' ).forEach( ( vslide, v ) => {\n\t\t\t\t\tvslide.setAttribute( 'data-index-h', h );\n\t\t\t\t\tvslide.setAttribute( 'data-index-v', v );\n\n\t\t\t\t\ttransformElement( vslide, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );\n\t\t\t\t} );\n\n\t\t\t}\n\t\t} );\n\n\t\t// Layout slide backgrounds\n\t\tArray.from( this.Reveal.getBackgroundsElement().childNodes ).forEach( ( hbackground, h ) => {\n\t\t\ttransformElement( hbackground, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );\n\n\t\t\tqueryAll( hbackground, '.slide-background' ).forEach( ( vbackground, v ) => {\n\t\t\t\ttransformElement( vbackground, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );\n\t\t\t} );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Moves the overview viewport to the current slides.\n\t * Called each time the current slide changes.\n\t */\n\tupdate() {\n\n\t\tconst vmin = Math.min( window.innerWidth, window.innerHeight );\n\t\tconst scale = Math.max( vmin / 5, 150 ) / vmin;\n\t\tconst indices = this.Reveal.getIndices();\n\n\t\tthis.Reveal.transformSlides( {\n\t\t\toverview: [\n\t\t\t\t'scale('+ scale +')',\n\t\t\t\t'translateX('+ ( -indices.h * this.overviewSlideWidth ) +'px)',\n\t\t\t\t'translateY('+ ( -indices.v * this.overviewSlideHeight ) +'px)'\n\t\t\t].join( ' ' )\n\t\t} );\n\n\t}\n\n\t/**\n\t * Exits the slide overview and enters the currently\n\t * active slide.\n\t */\n\tdeactivate() {\n\n\t\t// Only proceed if enabled in config\n\t\tif( this.Reveal.getConfig().overview ) {\n\n\t\t\tthis.active = false;\n\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'overview' );\n\n\t\t\t// Temporarily add a class so that transitions can do different things\n\t\t\t// depending on whether they are exiting/entering overview, or just\n\t\t\t// moving from slide to slide\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'overview-deactivating' );\n\n\t\t\tsetTimeout( () => {\n\t\t\t\tthis.Reveal.getRevealElement().classList.remove( 'overview-deactivating' );\n\t\t\t}, 1 );\n\n\t\t\t// Move the background element back out\n\t\t\tthis.Reveal.getRevealElement().appendChild( this.Reveal.getBackgroundsElement() );\n\n\t\t\t// Clean up changes made to slides\n\t\t\tqueryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {\n\t\t\t\ttransformElement( slide, '' );\n\n\t\t\t\tslide.removeEventListener( 'click', this.onSlideClicked, true );\n\t\t\t} );\n\n\t\t\t// Clean up changes made to backgrounds\n\t\t\tqueryAll( this.Reveal.getBackgroundsElement(), '.slide-background' ).forEach( background => {\n\t\t\t\ttransformElement( background, '' );\n\t\t\t} );\n\n\t\t\tthis.Reveal.transformSlides( { overview: '' } );\n\n\t\t\tconst indices = this.Reveal.getIndices();\n\n\t\t\tthis.Reveal.slide( indices.h, indices.v );\n\t\t\tthis.Reveal.layout();\n\t\t\tthis.Reveal.cueAutoSlide();\n\n\t\t\t// Notify observers of the overview hiding\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'overviewhidden',\n\t\t\t\tdata: {\n\t\t\t\t\t'indexh': indices.h,\n\t\t\t\t\t'indexv': indices.v,\n\t\t\t\t\t'currentSlide': this.Reveal.getCurrentSlide()\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\t}\n\n\t/**\n\t * Toggles the slide overview mode on and off.\n\t *\n\t * @param {Boolean} [override] Flag which overrides the\n\t * toggle logic and forcibly sets the desired state. True means\n\t * overview is open, false means it's closed.\n\t */\n\ttoggle( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? this.activate() : this.deactivate();\n\t\t}\n\t\telse {\n\t\t\tthis.isActive() ? this.deactivate() : this.activate();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if the overview is currently active.\n\t *\n\t * @return {Boolean} true if the overview is active,\n\t * false otherwise\n\t */\n\tisActive() {\n\n\t\treturn this.active;\n\n\t}\n\n\t/**\n\t * Invoked when a slide is and we're in the overview.\n\t *\n\t * @param {object} event\n\t */\n\tonSlideClicked( event ) {\n\n\t\tif( this.isActive() ) {\n\t\t\tevent.preventDefault();\n\n\t\t\tlet element = event.target;\n\n\t\t\twhile( element && !element.nodeName.match( /section/gi ) ) {\n\t\t\t\telement = element.parentNode;\n\t\t\t}\n\n\t\t\tif( element && !element.classList.contains( 'disabled' ) ) {\n\n\t\t\t\tthis.deactivate();\n\n\t\t\t\tif( element.nodeName.match( /section/gi ) ) {\n\t\t\t\t\tlet h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),\n\t\t\t\t\t\tv = parseInt( element.getAttribute( 'data-index-v' ), 10 );\n\n\t\t\t\t\tthis.Reveal.slide( h, v );\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\n\t}\n\n}","import { enterFullscreen } from '../utils/util.js'\n\n/**\n * Handles all reveal.js keyboard interactions.\n */\nexport default class Keyboard {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// A key:value map of keyboard keys and descriptions of\n\t\t// the actions they trigger\n\t\tthis.shortcuts = {};\n\n\t\t// Holds custom key code mappings\n\t\tthis.bindings = {};\n\n\t\tthis.onDocumentKeyDown = this.onDocumentKeyDown.bind( this );\n\t\tthis.onDocumentKeyPress = this.onDocumentKeyPress.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.navigationMode === 'linear' ) {\n\t\t\tthis.shortcuts['&#8594;  ,  &#8595;  ,  SPACE  ,  N  ,  L  ,  J'] = 'Next slide';\n\t\t\tthis.shortcuts['&#8592;  ,  &#8593;  ,  P  ,  H  ,  K']           = 'Previous slide';\n\t\t}\n\t\telse {\n\t\t\tthis.shortcuts['N  ,  SPACE']   = 'Next slide';\n\t\t\tthis.shortcuts['P  ,  Shift SPACE']             = 'Previous slide';\n\t\t\tthis.shortcuts['&#8592;  ,  H'] = 'Navigate left';\n\t\t\tthis.shortcuts['&#8594;  ,  L'] = 'Navigate right';\n\t\t\tthis.shortcuts['&#8593;  ,  K'] = 'Navigate up';\n\t\t\tthis.shortcuts['&#8595;  ,  J'] = 'Navigate down';\n\t\t}\n\n\t\tthis.shortcuts['Alt + &#8592;/&#8593/&#8594;/&#8595;']        = 'Navigate without fragments';\n\t\tthis.shortcuts['Shift + &#8592;/&#8593/&#8594;/&#8595;']      = 'Jump to first/last slide';\n\t\tthis.shortcuts['B  ,  .']                       = 'Pause';\n\t\tthis.shortcuts['F']                             = 'Fullscreen';\n\t\tthis.shortcuts['ESC, O']                        = 'Slide overview';\n\n\t}\n\n\t/**\n\t * Starts listening for keyboard events.\n\t */\n\tbind() {\n\n\t\tdocument.addEventListener( 'keydown', this.onDocumentKeyDown, false );\n\t\tdocument.addEventListener( 'keypress', this.onDocumentKeyPress, false );\n\n\t}\n\n\t/**\n\t * Stops listening for keyboard events.\n\t */\n\tunbind() {\n\n\t\tdocument.removeEventListener( 'keydown', this.onDocumentKeyDown, false );\n\t\tdocument.removeEventListener( 'keypress', this.onDocumentKeyPress, false );\n\n\t}\n\n\t/**\n\t * Add a custom key binding with optional description to\n\t * be added to the help screen.\n\t */\n\taddKeyBinding( binding, callback ) {\n\n\t\tif( typeof binding === 'object' && binding.keyCode ) {\n\t\t\tthis.bindings[binding.keyCode] = {\n\t\t\t\tcallback: callback,\n\t\t\t\tkey: binding.key,\n\t\t\t\tdescription: binding.description\n\t\t\t};\n\t\t}\n\t\telse {\n\t\t\tthis.bindings[binding] = {\n\t\t\t\tcallback: callback,\n\t\t\t\tkey: null,\n\t\t\t\tdescription: null\n\t\t\t};\n\t\t}\n\n\t}\n\n\t/**\n\t * Removes the specified custom key binding.\n\t */\n\tremoveKeyBinding( keyCode ) {\n\n\t\tdelete this.bindings[keyCode];\n\n\t}\n\n\t/**\n\t * Programmatically triggers a keyboard event\n\t *\n\t * @param {int} keyCode\n\t */\n\ttriggerKey( keyCode ) {\n\n\t\tthis.onDocumentKeyDown( { keyCode } );\n\n\t}\n\n\t/**\n\t * Registers a new shortcut to include in the help overlay\n\t *\n\t * @param {String} key\n\t * @param {String} value\n\t */\n\tregisterKeyboardShortcut( key, value ) {\n\n\t\tthis.shortcuts[key] = value;\n\n\t}\n\n\tgetShortcuts() {\n\n\t\treturn this.shortcuts;\n\n\t}\n\n\tgetBindings() {\n\n\t\treturn this.bindings;\n\n\t}\n\n\t/**\n\t * Handler for the document level 'keypress' event.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentKeyPress( event ) {\n\n\t\t// Check if the pressed key is question mark\n\t\tif( event.shiftKey && event.charCode === 63 ) {\n\t\t\tthis.Reveal.toggleHelp();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the document level 'keydown' event.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentKeyDown( event ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\t// If there's a condition specified and it returns false,\n\t\t// ignore this event\n\t\tif( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// If keyboardCondition is set, only capture keyboard events\n\t\t// for embedded decks when they are focused\n\t\tif( config.keyboardCondition === 'focused' && !this.Reveal.isFocused() ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Shorthand\n\t\tlet keyCode = event.keyCode;\n\n\t\t// Remember if auto-sliding was paused so we can toggle it\n\t\tlet autoSlideWasPaused = !this.Reveal.isAutoSliding();\n\n\t\tthis.Reveal.onUserInput( event );\n\n\t\t// Is there a focused element that could be using the keyboard?\n\t\tlet activeElementIsCE = document.activeElement && document.activeElement.isContentEditable === true;\n\t\tlet activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );\n\t\tlet activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);\n\n\t\t// Whitelist certain modifiers for slide navigation shortcuts\n\t\tlet isNavigationKey = [32, 37, 38, 39, 40, 78, 80].indexOf( event.keyCode ) !== -1;\n\n\t\t// Prevent all other events when a modifier is pressed\n\t\tlet unusedModifier = \t!( isNavigationKey && event.shiftKey || event.altKey ) &&\n\t\t\t\t\t\t\t\t( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );\n\n\t\t// Disregard the event if there's a focused element or a\n\t\t// keyboard modifier key is present\n\t\tif( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;\n\n\t\t// While paused only allow resume keyboard events; 'b', 'v', '.'\n\t\tlet resumeKeyCodes = [66,86,190,191];\n\t\tlet key;\n\n\t\t// Custom key bindings for togglePause should be able to resume\n\t\tif( typeof config.keyboard === 'object' ) {\n\t\t\tfor( key in config.keyboard ) {\n\t\t\t\tif( config.keyboard[key] === 'togglePause' ) {\n\t\t\t\t\tresumeKeyCodes.push( parseInt( key, 10 ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif( this.Reveal.isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Use linear navigation if we're configured to OR if\n\t\t// the presentation is one-dimensional\n\t\tlet useLinearMode = config.navigationMode === 'linear' || !this.Reveal.hasHorizontalSlides() || !this.Reveal.hasVerticalSlides();\n\n\t\tlet triggered = false;\n\n\t\t// 1. User defined key bindings\n\t\tif( typeof config.keyboard === 'object' ) {\n\n\t\t\tfor( key in config.keyboard ) {\n\n\t\t\t\t// Check if this binding matches the pressed key\n\t\t\t\tif( parseInt( key, 10 ) === keyCode ) {\n\n\t\t\t\t\tlet value = config.keyboard[ key ];\n\n\t\t\t\t\t// Callback function\n\t\t\t\t\tif( typeof value === 'function' ) {\n\t\t\t\t\t\tvalue.apply( null, [ event ] );\n\t\t\t\t\t}\n\t\t\t\t\t// String shortcuts to reveal.js API\n\t\t\t\t\telse if( typeof value === 'string' && typeof this.Reveal[ value ] === 'function' ) {\n\t\t\t\t\t\tthis.Reveal[ value ].call();\n\t\t\t\t\t}\n\n\t\t\t\t\ttriggered = true;\n\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t// 2. Registered custom key bindings\n\t\tif( triggered === false ) {\n\n\t\t\tfor( key in this.bindings ) {\n\n\t\t\t\t// Check if this binding matches the pressed key\n\t\t\t\tif( parseInt( key, 10 ) === keyCode ) {\n\n\t\t\t\t\tlet action = this.bindings[ key ].callback;\n\n\t\t\t\t\t// Callback function\n\t\t\t\t\tif( typeof action === 'function' ) {\n\t\t\t\t\t\taction.apply( null, [ event ] );\n\t\t\t\t\t}\n\t\t\t\t\t// String shortcuts to reveal.js API\n\t\t\t\t\telse if( typeof action === 'string' && typeof this.Reveal[ action ] === 'function' ) {\n\t\t\t\t\t\tthis.Reveal[ action ].call();\n\t\t\t\t\t}\n\n\t\t\t\t\ttriggered = true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// 3. System defined key bindings\n\t\tif( triggered === false ) {\n\n\t\t\t// Assume true and try to prove false\n\t\t\ttriggered = true;\n\n\t\t\t// P, PAGE UP\n\t\t\tif( keyCode === 80 || keyCode === 33 ) {\n\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t}\n\t\t\t// N, PAGE DOWN\n\t\t\telse if( keyCode === 78 || keyCode === 34 ) {\n\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t}\n\t\t\t// H, LEFT\n\t\t\telse if( keyCode === 72 || keyCode === 37 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( 0 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.left({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// L, RIGHT\n\t\t\telse if( keyCode === 76 || keyCode === 39 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.right({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// K, UP\n\t\t\telse if( keyCode === 75 || keyCode === 38 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( undefined, 0 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.up({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// J, DOWN\n\t\t\telse if( keyCode === 74 || keyCode === 40 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( undefined, Number.MAX_VALUE );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.down({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// HOME\n\t\t\telse if( keyCode === 36 ) {\n\t\t\t\tthis.Reveal.slide( 0 );\n\t\t\t}\n\t\t\t// END\n\t\t\telse if( keyCode === 35 ) {\n\t\t\t\tthis.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );\n\t\t\t}\n\t\t\t// SPACE\n\t\t\telse if( keyCode === 32 ) {\n\t\t\t\tif( this.Reveal.overview.isActive() ) {\n\t\t\t\t\tthis.Reveal.overview.deactivate();\n\t\t\t\t}\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS \"BLACK SCREEN\" BUTTON\n\t\t\telse if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {\n\t\t\t\tthis.Reveal.togglePause();\n\t\t\t}\n\t\t\t// F\n\t\t\telse if( keyCode === 70 ) {\n\t\t\t\tenterFullscreen( config.embedded ? this.Reveal.getViewportElement() : document.documentElement );\n\t\t\t}\n\t\t\t// A\n\t\t\telse if( keyCode === 65 ) {\n\t\t\t\tif ( config.autoSlideStoppable ) {\n\t\t\t\t\tthis.Reveal.toggleAutoSlide( autoSlideWasPaused );\n\t\t\t\t}\n\t\t\t}\n\t\t\telse {\n\t\t\t\ttriggered = false;\n\t\t\t}\n\n\t\t}\n\n\t\t// If the input resulted in a triggered action we should prevent\n\t\t// the browsers default behavior\n\t\tif( triggered ) {\n\t\t\tevent.preventDefault && event.preventDefault();\n\t\t}\n\t\t// ESC or O key\n\t\telse if( keyCode === 27 || keyCode === 79 ) {\n\t\t\tif( this.Reveal.closeOverlay() === false ) {\n\t\t\t\tthis.Reveal.overview.toggle();\n\t\t\t}\n\n\t\t\tevent.preventDefault && event.preventDefault();\n\t\t}\n\n\t\t// If auto-sliding is enabled we need to cue up\n\t\t// another timeout\n\t\tthis.Reveal.cueAutoSlide();\n\n\t}\n\n}","/**\n * Reads and writes the URL based on reveal.js' current state.\n */\nexport default class Location {\n\n\t// The minimum number of milliseconds that must pass between\n\t// calls to history.replaceState\n\tMAX_REPLACE_STATE_FREQUENCY = 1000\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Delays updates to the URL due to a Chrome thumbnailer bug\n\t\tthis.writeURLTimeout = 0;\n\n\t\tthis.replaceStateTimestamp = 0;\n\n\t\tthis.onWindowHashChange = this.onWindowHashChange.bind( this );\n\n\t}\n\n\tbind() {\n\n\t\twindow.addEventListener( 'hashchange', this.onWindowHashChange, false );\n\n\t}\n\n\tunbind() {\n\n\t\twindow.removeEventListener( 'hashchange', this.onWindowHashChange, false );\n\n\t}\n\n\t/**\n\t * Returns the slide indices for the given hash link.\n\t *\n\t * @param {string} [hash] the hash string that we want to\n\t * find the indices for\n\t *\n\t * @returns slide indices or null\n\t */\n\tgetIndicesFromHash( hash=window.location.hash ) {\n\n\t\t// Attempt to parse the hash as either an index or name\n\t\tlet name = hash.replace( /^#\\/?/, '' );\n\t\tlet bits = name.split( '/' );\n\n\t\t// If the first bit is not fully numeric and there is a name we\n\t\t// can assume that this is a named link\n\t\tif( !/^[0-9]*$/.test( bits[0] ) && name.length ) {\n\t\t\tlet element;\n\n\t\t\tlet f;\n\n\t\t\t// Parse named links with fragments (#/named-link/2)\n\t\t\tif( /\\/[-\\d]+$/g.test( name ) ) {\n\t\t\t\tf = parseInt( name.split( '/' ).pop(), 10 );\n\t\t\t\tf = isNaN(f) ? undefined : f;\n\t\t\t\tname = name.split( '/' ).shift();\n\t\t\t}\n\n\t\t\t// Ensure the named link is a valid HTML ID attribute\n\t\t\ttry {\n\t\t\t\telement = document.getElementById( decodeURIComponent( name ) );\n\t\t\t}\n\t\t\tcatch ( error ) { }\n\n\t\t\tif( element ) {\n\t\t\t\treturn { ...this.Reveal.getIndices( element ), f };\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tconst config = this.Reveal.getConfig();\n\t\t\tlet hashIndexBase = config.hashOneBasedIndex ? 1 : 0;\n\n\t\t\t// Read the index components of the hash\n\t\t\tlet h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,\n\t\t\t\tv = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,\n\t\t\t\tf;\n\n\t\t\tif( config.fragmentInURL ) {\n\t\t\t\tf = parseInt( bits[2], 10 );\n\t\t\t\tif( isNaN( f ) ) {\n\t\t\t\t\tf = undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn { h, v, f };\n\t\t}\n\n\t\t// The hash couldn't be parsed or no matching named link was found\n\t\treturn null\n\n\t}\n\n\t/**\n\t * Reads the current URL (hash) and navigates accordingly.\n\t */\n\treadURL() {\n\n\t\tconst currentIndices = this.Reveal.getIndices();\n\t\tconst newIndices = this.getIndicesFromHash();\n\n\t\tif( newIndices ) {\n\t\t\tif( ( newIndices.h !== currentIndices.h || newIndices.v !== currentIndices.v || newIndices.f !== undefined ) ) {\n\t\t\t\t\tthis.Reveal.slide( newIndices.h, newIndices.v, newIndices.f );\n\t\t\t}\n\t\t}\n\t\t// If no new indices are available, we're trying to navigate to\n\t\t// a slide hash that does not exist\n\t\telse {\n\t\t\tthis.Reveal.slide( currentIndices.h || 0, currentIndices.v || 0 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the page URL (hash) to reflect the current\n\t * state.\n\t *\n\t * @param {number} delay The time in ms to wait before\n\t * writing the hash\n\t */\n\twriteURL( delay ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\n\t\t// Make sure there's never more than one timeout running\n\t\tclearTimeout( this.writeURLTimeout );\n\n\t\t// If a delay is specified, timeout this call\n\t\tif( typeof delay === 'number' ) {\n\t\t\tthis.writeURLTimeout = setTimeout( this.writeURL, delay );\n\t\t}\n\t\telse if( currentSlide ) {\n\n\t\t\tlet hash = this.getHash();\n\n\t\t\t// If we're configured to push to history OR the history\n\t\t\t// API is not avaialble.\n\t\t\tif( config.history ) {\n\t\t\t\twindow.location.hash = hash;\n\t\t\t}\n\t\t\t// If we're configured to reflect the current slide in the\n\t\t\t// URL without pushing to history.\n\t\t\telse if( config.hash ) {\n\t\t\t\t// If the hash is empty, don't add it to the URL\n\t\t\t\tif( hash === '/' ) {\n\t\t\t\t\tthis.debouncedReplaceState( window.location.pathname + window.location.search );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.debouncedReplaceState( '#' + hash );\n\t\t\t\t}\n\t\t\t}\n\t\t\t// UPDATE: The below nuking of all hash changes breaks\n\t\t\t// anchors on pages where reveal.js is running. Removed\n\t\t\t// in 4.0. Why was it here in the first place? ¯\\_(ツ)_/¯\n\t\t\t//\n\t\t\t// If history and hash are both disabled, a hash may still\n\t\t\t// be added to the URL by clicking on a href with a hash\n\t\t\t// target. Counter this by always removing the hash.\n\t\t\t// else {\n\t\t\t// \twindow.history.replaceState( null, null, window.location.pathname + window.location.search );\n\t\t\t// }\n\n\t\t}\n\n\t}\n\n\treplaceState( url ) {\n\n\t\twindow.history.replaceState( null, null, url );\n\t\tthis.replaceStateTimestamp = Date.now();\n\n\t}\n\n\tdebouncedReplaceState( url ) {\n\n\t\tclearTimeout( this.replaceStateTimeout );\n\n\t\tif( Date.now() - this.replaceStateTimestamp > this.MAX_REPLACE_STATE_FREQUENCY ) {\n\t\t\tthis.replaceState( url );\n\t\t}\n\t\telse {\n\t\t\tthis.replaceStateTimeout = setTimeout( () => this.replaceState( url ), this.MAX_REPLACE_STATE_FREQUENCY );\n\t\t}\n\n\t}\n\n\t/**\n\t * Return a hash URL that will resolve to the given slide location.\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide to link to\n\t */\n\tgetHash( slide ) {\n\n\t\tlet url = '/';\n\n\t\t// Attempt to create a named link based on the slide's ID\n\t\tlet s = slide || this.Reveal.getCurrentSlide();\n\t\tlet id = s ? s.getAttribute( 'id' ) : null;\n\t\tif( id ) {\n\t\t\tid = encodeURIComponent( id );\n\t\t}\n\n\t\tlet index = this.Reveal.getIndices( slide );\n\t\tif( !this.Reveal.getConfig().fragmentInURL ) {\n\t\t\tindex.f = undefined;\n\t\t}\n\n\t\t// If the current slide has an ID, use that as a named link,\n\t\t// but we don't support named links with a fragment index\n\t\tif( typeof id === 'string' && id.length ) {\n\t\t\turl = '/' + id;\n\n\t\t\t// If there is also a fragment, append that at the end\n\t\t\t// of the named link, like: #/named-link/2\n\t\t\tif( index.f >= 0 ) url += '/' + index.f;\n\t\t}\n\t\t// Otherwise use the /h/v index\n\t\telse {\n\t\t\tlet hashIndexBase = this.Reveal.getConfig().hashOneBasedIndex ? 1 : 0;\n\t\t\tif( index.h > 0 || index.v > 0 || index.f >= 0 ) url += index.h + hashIndexBase;\n\t\t\tif( index.v > 0 || index.f >= 0 ) url += '/' + (index.v + hashIndexBase );\n\t\t\tif( index.f >= 0 ) url += '/' + index.f;\n\t\t}\n\n\t\treturn url;\n\n\t}\n\n\t/**\n\t * Handler for the window level 'hashchange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tonWindowHashChange( event ) {\n\n\t\tthis.readURL();\n\n\t}\n\n}","import { queryAll } from '../utils/util.js'\nimport { isAndroid } from '../utils/device.js'\n\n/**\n * Manages our presentation controls. This includes both\n * the built-in control arrows as well as event monitoring\n * of any elements within the presentation with either of the\n * following helper classes:\n * - .navigate-up\n * - .navigate-right\n * - .navigate-down\n * - .navigate-left\n * - .navigate-next\n * - .navigate-prev\n */\nexport default class Controls {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onNavigateLeftClicked = this.onNavigateLeftClicked.bind( this );\n\t\tthis.onNavigateRightClicked = this.onNavigateRightClicked.bind( this );\n\t\tthis.onNavigateUpClicked = this.onNavigateUpClicked.bind( this );\n\t\tthis.onNavigateDownClicked = this.onNavigateDownClicked.bind( this );\n\t\tthis.onNavigatePrevClicked = this.onNavigatePrevClicked.bind( this );\n\t\tthis.onNavigateNextClicked = this.onNavigateNextClicked.bind( this );\n\n\t}\n\n\trender() {\n\n\t\tconst rtl = this.Reveal.getConfig().rtl;\n\t\tconst revealElement = this.Reveal.getRevealElement();\n\n\t\tthis.element = document.createElement( 'aside' );\n\t\tthis.element.className = 'controls';\n\t\tthis.element.innerHTML =\n\t\t\t`<button class=\"navigate-left\" aria-label=\"${ rtl ? 'next slide' : 'previous slide' }\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-right\" aria-label=\"${ rtl ? 'previous slide' : 'next slide' }\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-up\" aria-label=\"above slide\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-down\" aria-label=\"below slide\"><div class=\"controls-arrow\"></div></button>`;\n\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t\t// There can be multiple instances of controls throughout the page\n\t\tthis.controlsLeft = queryAll( revealElement, '.navigate-left' );\n\t\tthis.controlsRight = queryAll( revealElement, '.navigate-right' );\n\t\tthis.controlsUp = queryAll( revealElement, '.navigate-up' );\n\t\tthis.controlsDown = queryAll( revealElement, '.navigate-down' );\n\t\tthis.controlsPrev = queryAll( revealElement, '.navigate-prev' );\n\t\tthis.controlsNext = queryAll( revealElement, '.navigate-next' );\n\n\t\t// The left, right and down arrows in the standard reveal.js controls\n\t\tthis.controlsRightArrow = this.element.querySelector( '.navigate-right' );\n\t\tthis.controlsLeftArrow = this.element.querySelector( '.navigate-left' );\n\t\tthis.controlsDownArrow = this.element.querySelector( '.navigate-down' );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tthis.element.style.display = config.controls ? 'block' : 'none';\n\n\t\tthis.element.setAttribute( 'data-controls-layout', config.controlsLayout );\n\t\tthis.element.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );\n\n\t}\n\n\tbind() {\n\n\t\t// Listen to both touch and click events, in case the device\n\t\t// supports both\n\t\tlet pointerEvents = [ 'touchstart', 'click' ];\n\n\t\t// Only support touch for Android, fixes double navigations in\n\t\t// stock browser\n\t\tif( isAndroid ) {\n\t\t\tpointerEvents = [ 'touchstart' ];\n\t\t}\n\n\t\tpointerEvents.forEach( eventName => {\n\t\t\tthis.controlsLeft.forEach( el => el.addEventListener( eventName, this.onNavigateLeftClicked, false ) );\n\t\t\tthis.controlsRight.forEach( el => el.addEventListener( eventName, this.onNavigateRightClicked, false ) );\n\t\t\tthis.controlsUp.forEach( el => el.addEventListener( eventName, this.onNavigateUpClicked, false ) );\n\t\t\tthis.controlsDown.forEach( el => el.addEventListener( eventName, this.onNavigateDownClicked, false ) );\n\t\t\tthis.controlsPrev.forEach( el => el.addEventListener( eventName, this.onNavigatePrevClicked, false ) );\n\t\t\tthis.controlsNext.forEach( el => el.addEventListener( eventName, this.onNavigateNextClicked, false ) );\n\t\t} );\n\n\t}\n\n\tunbind() {\n\n\t\t[ 'touchstart', 'click' ].forEach( eventName => {\n\t\t\tthis.controlsLeft.forEach( el => el.removeEventListener( eventName, this.onNavigateLeftClicked, false ) );\n\t\t\tthis.controlsRight.forEach( el => el.removeEventListener( eventName, this.onNavigateRightClicked, false ) );\n\t\t\tthis.controlsUp.forEach( el => el.removeEventListener( eventName, this.onNavigateUpClicked, false ) );\n\t\t\tthis.controlsDown.forEach( el => el.removeEventListener( eventName, this.onNavigateDownClicked, false ) );\n\t\t\tthis.controlsPrev.forEach( el => el.removeEventListener( eventName, this.onNavigatePrevClicked, false ) );\n\t\t\tthis.controlsNext.forEach( el => el.removeEventListener( eventName, this.onNavigateNextClicked, false ) );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Updates the state of all control/navigation arrows.\n\t */\n\tupdate() {\n\n\t\tlet routes = this.Reveal.availableRoutes();\n\n\t\t// Remove the 'enabled' class from all directions\n\t\t[...this.controlsLeft, ...this.controlsRight, ...this.controlsUp, ...this.controlsDown, ...this.controlsPrev, ...this.controlsNext].forEach( node => {\n\t\t\tnode.classList.remove( 'enabled', 'fragmented' );\n\n\t\t\t// Set 'disabled' attribute on all directions\n\t\t\tnode.setAttribute( 'disabled', 'disabled' );\n\t\t} );\n\n\t\t// Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons\n\t\tif( routes.left ) this.controlsLeft.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.right ) this.controlsRight.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.up ) this.controlsUp.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.down ) this.controlsDown.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t// Prev/next buttons\n\t\tif( routes.left || routes.up ) this.controlsPrev.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.right || routes.down ) this.controlsNext.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t// Highlight fragment directions\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide ) {\n\n\t\t\tlet fragmentsRoutes = this.Reveal.fragments.availableRoutes();\n\n\t\t\t// Always apply fragment decorator to prev/next buttons\n\t\t\tif( fragmentsRoutes.prev ) this.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\tif( fragmentsRoutes.next ) this.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t\t// Apply fragment decorators to directional buttons based on\n\t\t\t// what slide axis they are in\n\t\t\tif( this.Reveal.isVerticalSlide( currentSlide ) ) {\n\t\t\t\tif( fragmentsRoutes.prev ) this.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t\tif( fragmentsRoutes.next ) this.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif( fragmentsRoutes.prev ) this.controlsLeft.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t\tif( fragmentsRoutes.next ) this.controlsRight.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t}\n\n\t\t}\n\n\t\tif( this.Reveal.getConfig().controlsTutorial ) {\n\n\t\t\tlet indices = this.Reveal.getIndices();\n\n\t\t\t// Highlight control arrows with an animation to ensure\n\t\t\t// that the viewer knows how to navigate\n\t\t\tif( !this.Reveal.hasNavigatedVertically() && routes.down ) {\n\t\t\t\tthis.controlsDownArrow.classList.add( 'highlight' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.controlsDownArrow.classList.remove( 'highlight' );\n\n\t\t\t\tif( this.Reveal.getConfig().rtl ) {\n\n\t\t\t\t\tif( !this.Reveal.hasNavigatedHorizontally() && routes.left && indices.v === 0 ) {\n\t\t\t\t\t\tthis.controlsLeftArrow.classList.add( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.controlsLeftArrow.classList.remove( 'highlight' );\n\t\t\t\t\t}\n\n\t\t\t\t} else {\n\n\t\t\t\t\tif( !this.Reveal.hasNavigatedHorizontally() && routes.right && indices.v === 0 ) {\n\t\t\t\t\t\tthis.controlsRightArrow.classList.add( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.controlsRightArrow.classList.remove( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tdestroy() {\n\n\t\tthis.unbind();\n\t\tthis.element.remove();\n\n\t}\n\n\t/**\n\t * Event handlers for navigation control buttons.\n\t */\n\tonNavigateLeftClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tif( this.Reveal.getConfig().navigationMode === 'linear' ) {\n\t\t\tthis.Reveal.prev();\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.left();\n\t\t}\n\n\t}\n\n\tonNavigateRightClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tif( this.Reveal.getConfig().navigationMode === 'linear' ) {\n\t\t\tthis.Reveal.next();\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.right();\n\t\t}\n\n\t}\n\n\tonNavigateUpClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.up();\n\n\t}\n\n\tonNavigateDownClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.down();\n\n\t}\n\n\tonNavigatePrevClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.prev();\n\n\t}\n\n\tonNavigateNextClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.next();\n\n\t}\n\n\n}","/**\n * Creates a visual progress bar for the presentation.\n */\nexport default class Progress {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onProgressClicked = this.onProgressClicked.bind( this );\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'progress';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t\tthis.bar = document.createElement( 'span' );\n\t\tthis.element.appendChild( this.bar );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tthis.element.style.display = config.progress ? 'block' : 'none';\n\n\t}\n\n\tbind() {\n\n\t\tif( this.Reveal.getConfig().progress && this.element ) {\n\t\t\tthis.element.addEventListener( 'click', this.onProgressClicked, false );\n\t\t}\n\n\t}\n\n\tunbind() {\n\n\t\tif ( this.Reveal.getConfig().progress && this.element ) {\n\t\t\tthis.element.removeEventListener( 'click', this.onProgressClicked, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the progress bar to reflect the current slide.\n\t */\n\tupdate() {\n\n\t\t// Update progress if enabled\n\t\tif( this.Reveal.getConfig().progress && this.bar ) {\n\n\t\t\tlet scale = this.Reveal.getProgress();\n\n\t\t\t// Don't fill the progress bar if there's only one slide\n\t\t\tif( this.Reveal.getTotalSlides() < 2 ) {\n\t\t\t\tscale = 0;\n\t\t\t}\n\n\t\t\tthis.bar.style.transform = 'scaleX('+ scale +')';\n\n\t\t}\n\n\t}\n\n\tgetMaxWidth() {\n\n\t\treturn this.Reveal.getRevealElement().offsetWidth;\n\n\t}\n\n\t/**\n\t * Clicking on the progress bar results in a navigation to the\n\t * closest approximate horizontal slide using this equation:\n\t *\n\t * ( clickX / presentationWidth ) * numberOfSlides\n\t *\n\t * @param {object} event\n\t */\n\tonProgressClicked( event ) {\n\n\t\tthis.Reveal.onUserInput( event );\n\n\t\tevent.preventDefault();\n\n\t\tlet slides = this.Reveal.getSlides();\n\t\tlet slidesTotal = slides.length;\n\t\tlet slideIndex = Math.floor( ( event.clientX / this.getMaxWidth() ) * slidesTotal );\n\n\t\tif( this.Reveal.getConfig().rtl ) {\n\t\t\tslideIndex = slidesTotal - slideIndex;\n\t\t}\n\n\t\tlet targetIndices = this.Reveal.getIndices(slides[slideIndex]);\n\t\tthis.Reveal.slide( targetIndices.h, targetIndices.v );\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","/**\n * Handles hiding of the pointer/cursor when inactive.\n */\nexport default class Pointer {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Throttles mouse wheel navigation\n\t\tthis.lastMouseWheelStep = 0;\n\n\t\t// Is the mouse pointer currently hidden from view\n\t\tthis.cursorHidden = false;\n\n\t\t// Timeout used to determine when the cursor is inactive\n\t\tthis.cursorInactiveTimeout = 0;\n\n\t\tthis.onDocumentCursorActive = this.onDocumentCursorActive.bind( this );\n\t\tthis.onDocumentMouseScroll = this.onDocumentMouseScroll.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.mouseWheel ) {\n\t\t\tdocument.addEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF\n\t\t\tdocument.addEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\t}\n\t\telse {\n\t\t\tdocument.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF\n\t\t\tdocument.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\t}\n\n\t\t// Auto-hide the mouse pointer when its inactive\n\t\tif( config.hideInactiveCursor ) {\n\t\t\tdocument.addEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\t\tdocument.addEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\t\t}\n\t\telse {\n\t\t\tthis.showCursor();\n\n\t\t\tdocument.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\t\tdocument.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Shows the mouse pointer after it has been hidden with\n\t * #hideCursor.\n\t */\n\tshowCursor() {\n\n\t\tif( this.cursorHidden ) {\n\t\t\tthis.cursorHidden = false;\n\t\t\tthis.Reveal.getRevealElement().style.cursor = '';\n\t\t}\n\n\t}\n\n\t/**\n\t * Hides the mouse pointer when it's on top of the .reveal\n\t * container.\n\t */\n\thideCursor() {\n\n\t\tif( this.cursorHidden === false ) {\n\t\t\tthis.cursorHidden = true;\n\t\t\tthis.Reveal.getRevealElement().style.cursor = 'none';\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.showCursor();\n\n\t\tdocument.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false );\n\t\tdocument.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\tdocument.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\tdocument.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\n\t}\n\n\t/**\n\t * Called whenever there is mouse input at the document level\n\t * to determine if the cursor is active or not.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentCursorActive( event ) {\n\n\t\tthis.showCursor();\n\n\t\tclearTimeout( this.cursorInactiveTimeout );\n\n\t\tthis.cursorInactiveTimeout = setTimeout( this.hideCursor.bind( this ), this.Reveal.getConfig().hideCursorTime );\n\n\t}\n\n\t/**\n\t * Handles mouse wheel scrolling, throttled to avoid skipping\n\t * multiple slides.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentMouseScroll( event ) {\n\n\t\tif( Date.now() - this.lastMouseWheelStep > 1000 ) {\n\n\t\t\tthis.lastMouseWheelStep = Date.now();\n\n\t\t\tlet delta = event.detail || -event.wheelDelta;\n\t\t\tif( delta > 0 ) {\n\t\t\t\tthis.Reveal.next();\n\t\t\t}\n\t\t\telse if( delta < 0 ) {\n\t\t\t\tthis.Reveal.prev();\n\t\t\t}\n\n\t\t}\n\n\t}\n\n}","/**\n * Loads a JavaScript file from the given URL and executes it.\n *\n * @param {string} url Address of the .js file to load\n * @param {function} callback Method to invoke when the script\n * has loaded and executed\n */\nexport const loadScript = ( url, callback ) => {\n\n\tconst script = document.createElement( 'script' );\n\tscript.type = 'text/javascript';\n\tscript.async = false;\n\tscript.defer = false;\n\tscript.src = url;\n\n\tif( typeof callback === 'function' ) {\n\n\t\t// Success callback\n\t\tscript.onload = script.onreadystatechange = event => {\n\t\t\tif( event.type === 'load' || /loaded|complete/.test( script.readyState ) ) {\n\n\t\t\t\t// Kill event listeners\n\t\t\t\tscript.onload = script.onreadystatechange = script.onerror = null;\n\n\t\t\t\tcallback();\n\n\t\t\t}\n\t\t};\n\n\t\t// Error callback\n\t\tscript.onerror = err => {\n\n\t\t\t// Kill event listeners\n\t\t\tscript.onload = script.onreadystatechange = script.onerror = null;\n\n\t\t\tcallback( new Error( 'Failed loading script: ' + script.src + '\\n' + err ) );\n\n\t\t};\n\n\t}\n\n\t// Append the script at the end of <head>\n\tconst head = document.querySelector( 'head' );\n\thead.insertBefore( script, head.lastChild );\n\n}","import { loadScript } from '../utils/loader.js'\n\n/**\n * Manages loading and registering of reveal.js plugins.\n */\nexport default class Plugins {\n\n\tconstructor( reveal ) {\n\n\t\tthis.Reveal = reveal;\n\n\t\t// Flags our current state (idle -> loading -> loaded)\n\t\tthis.state = 'idle';\n\n\t\t// An id:instance map of currently registed plugins\n\t\tthis.registeredPlugins = {};\n\n\t\tthis.asyncDependencies = [];\n\n\t}\n\n\t/**\n\t * Loads reveal.js dependencies, registers and\n\t * initializes plugins.\n\t *\n\t * Plugins are direct references to a reveal.js plugin\n\t * object that we register and initialize after any\n\t * synchronous dependencies have loaded.\n\t *\n\t * Dependencies are defined via the 'dependencies' config\n\t * option and will be loaded prior to starting reveal.js.\n\t * Some dependencies may have an 'async' flag, if so they\n\t * will load after reveal.js has been started up.\n\t */\n\tload( plugins, dependencies ) {\n\n\t\tthis.state = 'loading';\n\n\t\tplugins.forEach( this.registerPlugin.bind( this ) );\n\n\t\treturn new Promise( resolve => {\n\n\t\t\tlet scripts = [],\n\t\t\t\tscriptsToLoad = 0;\n\n\t\t\tdependencies.forEach( s => {\n\t\t\t\t// Load if there's no condition or the condition is truthy\n\t\t\t\tif( !s.condition || s.condition() ) {\n\t\t\t\t\tif( s.async ) {\n\t\t\t\t\t\tthis.asyncDependencies.push( s );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tscripts.push( s );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tif( scripts.length ) {\n\t\t\t\tscriptsToLoad = scripts.length;\n\n\t\t\t\tconst scriptLoadedCallback = (s) => {\n\t\t\t\t\tif( s && typeof s.callback === 'function' ) s.callback();\n\n\t\t\t\t\tif( --scriptsToLoad === 0 ) {\n\t\t\t\t\t\tthis.initPlugins().then( resolve );\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\t// Load synchronous scripts\n\t\t\t\tscripts.forEach( s => {\n\t\t\t\t\tif( typeof s.id === 'string' ) {\n\t\t\t\t\t\tthis.registerPlugin( s );\n\t\t\t\t\t\tscriptLoadedCallback( s );\n\t\t\t\t\t}\n\t\t\t\t\telse if( typeof s.src === 'string' ) {\n\t\t\t\t\t\tloadScript( s.src, () => scriptLoadedCallback(s) );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tconsole.warn( 'Unrecognized plugin format', s );\n\t\t\t\t\t\tscriptLoadedCallback();\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.initPlugins().then( resolve );\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Initializes our plugins and waits for them to be ready\n\t * before proceeding.\n\t */\n\tinitPlugins() {\n\n\t\treturn new Promise( resolve => {\n\n\t\t\tlet pluginValues = Object.values( this.registeredPlugins );\n\t\t\tlet pluginsToInitialize = pluginValues.length;\n\n\t\t\t// If there are no plugins, skip this step\n\t\t\tif( pluginsToInitialize === 0 ) {\n\t\t\t\tthis.loadAsync().then( resolve );\n\t\t\t}\n\t\t\t// ... otherwise initialize plugins\n\t\t\telse {\n\n\t\t\t\tlet initNextPlugin;\n\n\t\t\t\tlet afterPlugInitialized = () => {\n\t\t\t\t\tif( --pluginsToInitialize === 0 ) {\n\t\t\t\t\t\tthis.loadAsync().then( resolve );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tinitNextPlugin();\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\tlet i = 0;\n\n\t\t\t\t// Initialize plugins serially\n\t\t\t\tinitNextPlugin = () => {\n\n\t\t\t\t\tlet plugin = pluginValues[i++];\n\n\t\t\t\t\t// If the plugin has an 'init' method, invoke it\n\t\t\t\t\tif( typeof plugin.init === 'function' ) {\n\t\t\t\t\t\tlet promise = plugin.init( this.Reveal );\n\n\t\t\t\t\t\t// If the plugin returned a Promise, wait for it\n\t\t\t\t\t\tif( promise && typeof promise.then === 'function' ) {\n\t\t\t\t\t\t\tpromise.then( afterPlugInitialized );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tafterPlugInitialized();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tafterPlugInitialized();\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tinitNextPlugin();\n\n\t\t\t}\n\n\t\t} )\n\n\t}\n\n\t/**\n\t * Loads all async reveal.js dependencies.\n\t */\n\tloadAsync() {\n\n\t\tthis.state = 'loaded';\n\n\t\tif( this.asyncDependencies.length ) {\n\t\t\tthis.asyncDependencies.forEach( s => {\n\t\t\t\tloadScript( s.src, s.callback );\n\t\t\t} );\n\t\t}\n\n\t\treturn Promise.resolve();\n\n\t}\n\n\t/**\n\t * Registers a new plugin with this reveal.js instance.\n\t *\n\t * reveal.js waits for all regisered plugins to initialize\n\t * before considering itself ready, as long as the plugin\n\t * is registered before calling `Reveal.initialize()`.\n\t */\n\tregisterPlugin( plugin ) {\n\n\t\t// Backwards compatibility to make reveal.js ~3.9.0\n\t\t// plugins work with reveal.js 4.0.0\n\t\tif( arguments.length === 2 && typeof arguments[0] === 'string' ) {\n\t\t\tplugin = arguments[1];\n\t\t\tplugin.id = arguments[0];\n\t\t}\n\t\t// Plugin can optionally be a function which we call\n\t\t// to create an instance of the plugin\n\t\telse if( typeof plugin === 'function' ) {\n\t\t\tplugin = plugin();\n\t\t}\n\n\t\tlet id = plugin.id;\n\n\t\tif( typeof id !== 'string' ) {\n\t\t\tconsole.warn( 'Unrecognized plugin format; can\\'t find plugin.id', plugin );\n\t\t}\n\t\telse if( this.registeredPlugins[id] === undefined ) {\n\t\t\tthis.registeredPlugins[id] = plugin;\n\n\t\t\t// If a plugin is registered after reveal.js is loaded,\n\t\t\t// initialize it right away\n\t\t\tif( this.state === 'loaded' && typeof plugin.init === 'function' ) {\n\t\t\t\tplugin.init( this.Reveal );\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tconsole.warn( 'reveal.js: \"'+ id +'\" plugin has already been registered' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if a specific plugin has been registered.\n\t *\n\t * @param {String} id Unique plugin identifier\n\t */\n\thasPlugin( id ) {\n\n\t\treturn !!this.registeredPlugins[id];\n\n\t}\n\n\t/**\n\t * Returns the specific plugin instance, if a plugin\n\t * with the given ID has been registered.\n\t *\n\t * @param {String} id Unique plugin identifier\n\t */\n\tgetPlugin( id ) {\n\n\t\treturn this.registeredPlugins[id];\n\n\t}\n\n\tgetRegisteredPlugins() {\n\n\t\treturn this.registeredPlugins;\n\n\t}\n\n\tdestroy() {\n\n\t\tObject.values( this.registeredPlugins ).forEach( plugin => {\n\t\t\tif( typeof plugin.destroy === 'function' ) {\n\t\t\t\tplugin.destroy();\n\t\t\t}\n\t\t} );\n\n\t\tthis.registeredPlugins = {};\n\t\tthis.asyncDependencies = [];\n\n\t}\n\n}\n","import { SLIDES_SELECTOR } from '../utils/constants.js'\nimport { queryAll, createStyleSheet } from '../utils/util.js'\n\n/**\n * Setups up our presentation for printing/exporting to PDF.\n */\nexport default class Print {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Configures the presentation for printing to a static\n\t * PDF.\n\t */\n\tasync setupPDF() {\n\n\t\tconst config = this.Reveal.getConfig();\n\t\tconst slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )\n\n\t\t// Compute slide numbers now, before we start duplicating slides\n\t\tconst injectPageNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );\n\n\t\tconst slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );\n\n\t\t// Dimensions of the PDF pages\n\t\tconst pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),\n\t\t\tpageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );\n\n\t\t// Dimensions of slides within the pages\n\t\tconst slideWidth = slideSize.width,\n\t\t\tslideHeight = slideSize.height;\n\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\t// Let the browser know what page size we want to print\n\t\tcreateStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );\n\n\t\t// Limit the size of certain elements to the dimensions of the slide\n\t\tcreateStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );\n\n\t\tdocument.documentElement.classList.add( 'print-pdf' );\n\t\tdocument.body.style.width = pageWidth + 'px';\n\t\tdocument.body.style.height = pageHeight + 'px';\n\n\t\tconst viewportElement = document.querySelector( '.reveal-viewport' );\n\t\tlet presentationBackground;\n\t\tif( viewportElement ) {\n\t\t\tconst viewportStyles = window.getComputedStyle( viewportElement );\n\t\t\tif( viewportStyles && viewportStyles.background ) {\n\t\t\t\tpresentationBackground = viewportStyles.background;\n\t\t\t}\n\t\t}\n\n\t\t// Make sure stretch elements fit on slide\n\t\tawait new Promise( requestAnimationFrame );\n\t\tthis.Reveal.layoutSlideContents( slideWidth, slideHeight );\n\n\t\t// Batch scrollHeight access to prevent layout thrashing\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\tconst slideScrollHeights = slides.map( slide => slide.scrollHeight );\n\n\t\tconst pages = [];\n\t\tconst pageContainer = slides[0].parentNode;\n\t\tlet slideNumber = 1;\n\n\t\t// Slide and slide background layout\n\t\tslides.forEach( function( slide, index ) {\n\n\t\t\t// Vertical stacks are not centred since their section\n\t\t\t// children will be\n\t\t\tif( slide.classList.contains( 'stack' ) === false ) {\n\t\t\t\t// Center the slide inside of the page, giving the slide some margin\n\t\t\t\tlet left = ( pageWidth - slideWidth ) / 2;\n\t\t\t\tlet top = ( pageHeight - slideHeight ) / 2;\n\n\t\t\t\tconst contentHeight = slideScrollHeights[ index ];\n\t\t\t\tlet numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );\n\n\t\t\t\t// Adhere to configured pages per slide limit\n\t\t\t\tnumberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );\n\n\t\t\t\t// Center slides vertically\n\t\t\t\tif( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {\n\t\t\t\t\ttop = Math.max( ( pageHeight - contentHeight ) / 2, 0 );\n\t\t\t\t}\n\n\t\t\t\t// Wrap the slide in a page element and hide its overflow\n\t\t\t\t// so that no page ever flows onto another\n\t\t\t\tconst page = document.createElement( 'div' );\n\t\t\t\tpages.push( page );\n\n\t\t\t\tpage.className = 'pdf-page';\n\t\t\t\tpage.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';\n\n\t\t\t\t// Copy the presentation-wide background to each individual\n\t\t\t\t// page when printing\n\t\t\t\tif( presentationBackground ) {\n\t\t\t\t\tpage.style.background = presentationBackground;\n\t\t\t\t}\n\n\t\t\t\tpage.appendChild( slide );\n\n\t\t\t\t// Position the slide inside of the page\n\t\t\t\tslide.style.left = left + 'px';\n\t\t\t\tslide.style.top = top + 'px';\n\t\t\t\tslide.style.width = slideWidth + 'px';\n\n\t\t\t\t// Re-run the slide layout so that r-fit-text is applied based on\n\t\t\t\t// the printed slide size\n\t\t\t\tthis.Reveal.slideContent.layout( slide )\n\n\t\t\t\tif( slide.slideBackgroundElement ) {\n\t\t\t\t\tpage.insertBefore( slide.slideBackgroundElement, slide );\n\t\t\t\t}\n\n\t\t\t\t// Inject notes if `showNotes` is enabled\n\t\t\t\tif( config.showNotes ) {\n\n\t\t\t\t\t// Are there notes for this slide?\n\t\t\t\t\tconst notes = this.Reveal.getSlideNotes( slide );\n\t\t\t\t\tif( notes ) {\n\n\t\t\t\t\t\tconst notesSpacing = 8;\n\t\t\t\t\t\tconst notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';\n\t\t\t\t\t\tconst notesElement = document.createElement( 'div' );\n\t\t\t\t\t\tnotesElement.classList.add( 'speaker-notes' );\n\t\t\t\t\t\tnotesElement.classList.add( 'speaker-notes-pdf' );\n\t\t\t\t\t\tnotesElement.setAttribute( 'data-layout', notesLayout );\n\t\t\t\t\t\tnotesElement.innerHTML = notes;\n\n\t\t\t\t\t\tif( notesLayout === 'separate-page' ) {\n\t\t\t\t\t\t\tpages.push( notesElement );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tnotesElement.style.left = notesSpacing + 'px';\n\t\t\t\t\t\t\tnotesElement.style.bottom = notesSpacing + 'px';\n\t\t\t\t\t\t\tnotesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';\n\t\t\t\t\t\t\tpage.appendChild( notesElement );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\t// Inject page numbers if `slideNumbers` are enabled\n\t\t\t\tif( injectPageNumbers ) {\n\t\t\t\t\tconst numberElement = document.createElement( 'div' );\n\t\t\t\t\tnumberElement.classList.add( 'slide-number' );\n\t\t\t\t\tnumberElement.classList.add( 'slide-number-pdf' );\n\t\t\t\t\tnumberElement.innerHTML = slideNumber++;\n\t\t\t\t\tpage.appendChild( numberElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy page and show fragments one after another\n\t\t\t\tif( config.pdfSeparateFragments ) {\n\n\t\t\t\t\t// Each fragment 'group' is an array containing one or more\n\t\t\t\t\t// fragments. Multiple fragments that appear at the same time\n\t\t\t\t\t// are part of the same group.\n\t\t\t\t\tconst fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );\n\n\t\t\t\t\tlet previousFragmentStep;\n\n\t\t\t\t\tfragmentGroups.forEach( function( fragments, index ) {\n\n\t\t\t\t\t\t// Remove 'current-fragment' from the previous group\n\t\t\t\t\t\tif( previousFragmentStep ) {\n\t\t\t\t\t\t\tpreviousFragmentStep.forEach( function( fragment ) {\n\t\t\t\t\t\t\t\tfragment.classList.remove( 'current-fragment' );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\t// Show the fragments for the current index\n\t\t\t\t\t\tfragments.forEach( function( fragment ) {\n\t\t\t\t\t\t\tfragment.classList.add( 'visible', 'current-fragment' );\n\t\t\t\t\t\t}, this );\n\n\t\t\t\t\t\t// Create a separate page for the current fragment state\n\t\t\t\t\t\tconst clonedPage = page.cloneNode( true );\n\n\t\t\t\t\t\t// Inject unique page numbers for fragments\n\t\t\t\t\t\tif( injectPageNumbers ) {\n\t\t\t\t\t\t\tconst numberElement = clonedPage.querySelector( '.slide-number-pdf' );\n\t\t\t\t\t\t\tconst fragmentNumber = index + 1;\n\t\t\t\t\t\t\tnumberElement.innerHTML += '.' + fragmentNumber;\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tpages.push( clonedPage );\n\n\t\t\t\t\t\tpreviousFragmentStep = fragments;\n\n\t\t\t\t\t}, this );\n\n\t\t\t\t\t// Reset the first/original page so that all fragments are hidden\n\t\t\t\t\tfragmentGroups.forEach( function( fragments ) {\n\t\t\t\t\t\tfragments.forEach( function( fragment ) {\n\t\t\t\t\t\t\tfragment.classList.remove( 'visible', 'current-fragment' );\n\t\t\t\t\t\t} );\n\t\t\t\t\t} );\n\n\t\t\t\t}\n\t\t\t\t// Show all fragments\n\t\t\t\telse {\n\t\t\t\t\tqueryAll( page, '.fragment:not(.fade-out)' ).forEach( function( fragment ) {\n\t\t\t\t\t\tfragment.classList.add( 'visible' );\n\t\t\t\t\t} );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}, this );\n\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\tpages.forEach( page => pageContainer.appendChild( page ) );\n\n\t\t// Notify subscribers that the PDF layout is good to go\n\t\tthis.Reveal.dispatchEvent({ type: 'pdf-ready' });\n\n\t}\n\n\t/**\n\t * Checks if this instance is being used to print a PDF.\n\t */\n\tisPrintingPDF() {\n\n\t\treturn ( /print-pdf/gi ).test( window.location.search );\n\n\t}\n\n}\n","import { isAndroid } from '../utils/device.js'\nimport { matches } from '../utils/util.js'\n\nconst SWIPE_THRESHOLD = 40;\n\n/**\n * Controls all touch interactions and navigations for\n * a presentation.\n */\nexport default class Touch {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Holds information about the currently ongoing touch interaction\n\t\tthis.touchStartX = 0;\n\t\tthis.touchStartY = 0;\n\t\tthis.touchStartCount = 0;\n\t\tthis.touchCaptured = false;\n\n\t\tthis.onPointerDown = this.onPointerDown.bind( this );\n\t\tthis.onPointerMove = this.onPointerMove.bind( this );\n\t\tthis.onPointerUp = this.onPointerUp.bind( this );\n\t\tthis.onTouchStart = this.onTouchStart.bind( this );\n\t\tthis.onTouchMove = this.onTouchMove.bind( this );\n\t\tthis.onTouchEnd = this.onTouchEnd.bind( this );\n\n\t}\n\n\t/**\n\t *\n\t */\n\tbind() {\n\n\t\tlet revealElement = this.Reveal.getRevealElement();\n\n\t\tif( 'onpointerdown' in window ) {\n\t\t\t// Use W3C pointer events\n\t\t\trevealElement.addEventListener( 'pointerdown', this.onPointerDown, false );\n\t\t\trevealElement.addEventListener( 'pointermove', this.onPointerMove, false );\n\t\t\trevealElement.addEventListener( 'pointerup', this.onPointerUp, false );\n\t\t}\n\t\telse if( window.navigator.msPointerEnabled ) {\n\t\t\t// IE 10 uses prefixed version of pointer events\n\t\t\trevealElement.addEventListener( 'MSPointerDown', this.onPointerDown, false );\n\t\t\trevealElement.addEventListener( 'MSPointerMove', this.onPointerMove, false );\n\t\t\trevealElement.addEventListener( 'MSPointerUp', this.onPointerUp, false );\n\t\t}\n\t\telse {\n\t\t\t// Fall back to touch events\n\t\t\trevealElement.addEventListener( 'touchstart', this.onTouchStart, false );\n\t\t\trevealElement.addEventListener( 'touchmove', this.onTouchMove, false );\n\t\t\trevealElement.addEventListener( 'touchend', this.onTouchEnd, false );\n\t\t}\n\n\t}\n\n\t/**\n\t *\n\t */\n\tunbind() {\n\n\t\tlet revealElement = this.Reveal.getRevealElement();\n\n\t\trevealElement.removeEventListener( 'pointerdown', this.onPointerDown, false );\n\t\trevealElement.removeEventListener( 'pointermove', this.onPointerMove, false );\n\t\trevealElement.removeEventListener( 'pointerup', this.onPointerUp, false );\n\n\t\trevealElement.removeEventListener( 'MSPointerDown', this.onPointerDown, false );\n\t\trevealElement.removeEventListener( 'MSPointerMove', this.onPointerMove, false );\n\t\trevealElement.removeEventListener( 'MSPointerUp', this.onPointerUp, false );\n\n\t\trevealElement.removeEventListener( 'touchstart', this.onTouchStart, false );\n\t\trevealElement.removeEventListener( 'touchmove', this.onTouchMove, false );\n\t\trevealElement.removeEventListener( 'touchend', this.onTouchEnd, false );\n\n\t}\n\n\t/**\n\t * Checks if the target element prevents the triggering of\n\t * swipe navigation.\n\t */\n\tisSwipePrevented( target ) {\n\n\t\t// Prevent accidental swipes when scrubbing timelines\n\t\tif( matches( target, 'video, audio' ) ) return true;\n\n\t\twhile( target && typeof target.hasAttribute === 'function' ) {\n\t\t\tif( target.hasAttribute( 'data-prevent-swipe' ) ) return true;\n\t\t\ttarget = target.parentNode;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Handler for the 'touchstart' event, enables support for\n\t * swipe and pinch gestures.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchStart( event ) {\n\n\t\tif( this.isSwipePrevented( event.target ) ) return true;\n\n\t\tthis.touchStartX = event.touches[0].clientX;\n\t\tthis.touchStartY = event.touches[0].clientY;\n\t\tthis.touchStartCount = event.touches.length;\n\n\t}\n\n\t/**\n\t * Handler for the 'touchmove' event.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchMove( event ) {\n\n\t\tif( this.isSwipePrevented( event.target ) ) return true;\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\t// Each touch should only trigger one action\n\t\tif( !this.touchCaptured ) {\n\t\t\tthis.Reveal.onUserInput( event );\n\n\t\t\tlet currentX = event.touches[0].clientX;\n\t\t\tlet currentY = event.touches[0].clientY;\n\n\t\t\t// There was only one touch point, look for a swipe\n\t\t\tif( event.touches.length === 1 && this.touchStartCount !== 2 ) {\n\n\t\t\t\tlet availableRoutes = this.Reveal.availableRoutes({ includeFragments: true });\n\n\t\t\t\tlet deltaX = currentX - this.touchStartX,\n\t\t\t\t\tdeltaY = currentY - this.touchStartY;\n\n\t\t\t\tif( deltaX > SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tif( config.rtl ) {\n\t\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.left();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaX < -SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tif( config.rtl ) {\n\t\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.right();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaY > SWIPE_THRESHOLD && availableRoutes.up ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.up();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaY < -SWIPE_THRESHOLD && availableRoutes.down ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.down();\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// If we're embedded, only block touch events if they have\n\t\t\t\t// triggered an action\n\t\t\t\tif( config.embedded ) {\n\t\t\t\t\tif( this.touchCaptured || this.Reveal.isVerticalSlide() ) {\n\t\t\t\t\t\tevent.preventDefault();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Not embedded? Block them all to avoid needless tossing\n\t\t\t\t// around of the viewport in iOS\n\t\t\t\telse {\n\t\t\t\t\tevent.preventDefault();\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\t\t// There's a bug with swiping on some Android devices unless\n\t\t// the default action is always prevented\n\t\telse if( isAndroid ) {\n\t\t\tevent.preventDefault();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the 'touchend' event.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchEnd( event ) {\n\n\t\tthis.touchCaptured = false;\n\n\t}\n\n\t/**\n\t * Convert pointer down to touch start.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerDown( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" ) {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchStart( event );\n\t\t}\n\n\t}\n\n\t/**\n\t * Convert pointer move to touch move.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerMove( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" )  {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchMove( event );\n\t\t}\n\n\t}\n\n\t/**\n\t * Convert pointer up to touch end.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerUp( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" )  {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchEnd( event );\n\t\t}\n\n\t}\n\n}","import { closest } from '../utils/util.js'\n\n/**\n * Manages focus when a presentation is embedded. This\n * helps us only capture keyboard from the presentation\n * a user is currently interacting with in a page where\n * multiple presentations are embedded.\n */\n\nconst STATE_FOCUS = 'focus';\nconst STATE_BLUR = 'blur';\n\nexport default class Focus {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onRevealPointerDown = this.onRevealPointerDown.bind( this );\n\t\tthis.onDocumentPointerDown = this.onDocumentPointerDown.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.embedded ) {\n\t\t\tthis.blur();\n\t\t}\n\t\telse {\n\t\t\tthis.focus();\n\t\t\tthis.unbind();\n\t\t}\n\n\t}\n\n\tbind() {\n\n\t\tif( this.Reveal.getConfig().embedded ) {\n\t\t\tthis.Reveal.getRevealElement().addEventListener( 'pointerdown', this.onRevealPointerDown, false );\n\t\t}\n\n\t}\n\n\tunbind() {\n\n\t\tthis.Reveal.getRevealElement().removeEventListener( 'pointerdown', this.onRevealPointerDown, false );\n\t\tdocument.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\n\t}\n\n\tfocus() {\n\n\t\tif( this.state !== STATE_FOCUS ) {\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'focused' );\n\t\t\tdocument.addEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\t\t}\n\n\t\tthis.state = STATE_FOCUS;\n\n\t}\n\n\tblur() {\n\n\t\tif( this.state !== STATE_BLUR ) {\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'focused' );\n\t\t\tdocument.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\t\t}\n\n\t\tthis.state = STATE_BLUR;\n\n\t}\n\n\tisFocused() {\n\n\t\treturn this.state === STATE_FOCUS;\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.Reveal.getRevealElement().classList.remove( 'focused' );\n\n\t}\n\n\tonRevealPointerDown( event ) {\n\n\t\tthis.focus();\n\n\t}\n\n\tonDocumentPointerDown( event ) {\n\n\t\tlet revealElement = closest( event.target, '.reveal' );\n\t\tif( !revealElement || revealElement !== this.Reveal.getRevealElement() ) {\n\t\t\tthis.blur();\n\t\t}\n\n\t}\n\n}","/**\n * Handles the showing and \n */\nexport default class Notes {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'speaker-notes';\n\t\tthis.element.setAttribute( 'data-prevent-swipe', '' );\n\t\tthis.element.setAttribute( 'tabindex', '0' );\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.showNotes ) {\n\t\t\tthis.element.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Pick up notes from the current slide and display them\n\t * to the viewer.\n\t *\n\t * @see {@link config.showNotes}\n\t */\n\tupdate() {\n\n\t\tif( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) {\n\n\t\t\tthis.element.innerHTML = this.getSlideNotes() || '<span class=\"notes-placeholder\">No notes on this slide.</span>';\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the visibility of the speaker notes sidebar that\n\t * is used to share annotated slides. The notes sidebar is\n\t * only visible if showNotes is true and there are notes on\n\t * one or more slides in the deck.\n\t */\n\tupdateVisibility() {\n\n\t\tif( this.Reveal.getConfig().showNotes && this.hasNotes() && !this.Reveal.print.isPrintingPDF() ) {\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'show-notes' );\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'show-notes' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if there are speaker notes for ANY slide in the\n\t * presentation.\n\t */\n\thasNotes() {\n\n\t\treturn this.Reveal.getSlidesElement().querySelectorAll( '[data-notes], aside.notes' ).length > 0;\n\n\t}\n\n\t/**\n\t * Checks if this presentation is running inside of the\n\t * speaker notes window.\n\t *\n\t * @return {boolean}\n\t */\n\tisSpeakerNotesWindow() {\n\n\t\treturn !!window.location.search.match( /receiver/gi );\n\n\t}\n\n\t/**\n\t * Retrieves the speaker notes from a slide. Notes can be\n\t * defined in two ways:\n\t * 1. As a data-notes attribute on the slide <section>\n\t * 2. As an <aside class=\"notes\"> inside of the slide\n\t *\n\t * @param {HTMLElement} [slide=currentSlide]\n\t * @return {(string|null)}\n\t */\n\tgetSlideNotes( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\t// Notes can be specified via the data-notes attribute...\n\t\tif( slide.hasAttribute( 'data-notes' ) ) {\n\t\t\treturn slide.getAttribute( 'data-notes' );\n\t\t}\n\n\t\t// ... or using an <aside class=\"notes\"> element\n\t\tlet notesElement = slide.querySelector( 'aside.notes' );\n\t\tif( notesElement ) {\n\t\t\treturn notesElement.innerHTML;\n\t\t}\n\n\t\treturn null;\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","/**\n * UI component that lets the use control auto-slide\n * playback via play/pause.\n */\nexport default class Playback {\n\n\t/**\n\t * @param {HTMLElement} container The component will append\n\t * itself to this\n\t * @param {function} progressCheck A method which will be\n\t * called frequently to get the current playback progress on\n\t * a range of 0-1\n\t */\n\tconstructor( container, progressCheck ) {\n\n\t\t// Cosmetics\n\t\tthis.diameter = 100;\n\t\tthis.diameter2 = this.diameter/2;\n\t\tthis.thickness = 6;\n\n\t\t// Flags if we are currently playing\n\t\tthis.playing = false;\n\n\t\t// Current progress on a 0-1 range\n\t\tthis.progress = 0;\n\n\t\t// Used to loop the animation smoothly\n\t\tthis.progressOffset = 1;\n\n\t\tthis.container = container;\n\t\tthis.progressCheck = progressCheck;\n\n\t\tthis.canvas = document.createElement( 'canvas' );\n\t\tthis.canvas.className = 'playback';\n\t\tthis.canvas.width = this.diameter;\n\t\tthis.canvas.height = this.diameter;\n\t\tthis.canvas.style.width = this.diameter2 + 'px';\n\t\tthis.canvas.style.height = this.diameter2 + 'px';\n\t\tthis.context = this.canvas.getContext( '2d' );\n\n\t\tthis.container.appendChild( this.canvas );\n\n\t\tthis.render();\n\n\t}\n\n\tsetPlaying( value ) {\n\n\t\tconst wasPlaying = this.playing;\n\n\t\tthis.playing = value;\n\n\t\t// Start repainting if we weren't already\n\t\tif( !wasPlaying && this.playing ) {\n\t\t\tthis.animate();\n\t\t}\n\t\telse {\n\t\t\tthis.render();\n\t\t}\n\n\t}\n\n\tanimate() {\n\n\t\tconst progressBefore = this.progress;\n\n\t\tthis.progress = this.progressCheck();\n\n\t\t// When we loop, offset the progress so that it eases\n\t\t// smoothly rather than immediately resetting\n\t\tif( progressBefore > 0.8 && this.progress < 0.2 ) {\n\t\t\tthis.progressOffset = this.progress;\n\t\t}\n\n\t\tthis.render();\n\n\t\tif( this.playing ) {\n\t\t\trequestAnimationFrame( this.animate.bind( this ) );\n\t\t}\n\n\t}\n\n\t/**\n\t * Renders the current progress and playback state.\n\t */\n\trender() {\n\n\t\tlet progress = this.playing ? this.progress : 0,\n\t\t\tradius = ( this.diameter2 ) - this.thickness,\n\t\t\tx = this.diameter2,\n\t\t\ty = this.diameter2,\n\t\t\ticonSize = 28;\n\n\t\t// Ease towards 1\n\t\tthis.progressOffset += ( 1 - this.progressOffset ) * 0.1;\n\n\t\tconst endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );\n\t\tconst startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );\n\n\t\tthis.context.save();\n\t\tthis.context.clearRect( 0, 0, this.diameter, this.diameter );\n\n\t\t// Solid background color\n\t\tthis.context.beginPath();\n\t\tthis.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );\n\t\tthis.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';\n\t\tthis.context.fill();\n\n\t\t// Draw progress track\n\t\tthis.context.beginPath();\n\t\tthis.context.arc( x, y, radius, 0, Math.PI * 2, false );\n\t\tthis.context.lineWidth = this.thickness;\n\t\tthis.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';\n\t\tthis.context.stroke();\n\n\t\tif( this.playing ) {\n\t\t\t// Draw progress on top of track\n\t\t\tthis.context.beginPath();\n\t\t\tthis.context.arc( x, y, radius, startAngle, endAngle, false );\n\t\t\tthis.context.lineWidth = this.thickness;\n\t\t\tthis.context.strokeStyle = '#fff';\n\t\t\tthis.context.stroke();\n\t\t}\n\n\t\tthis.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );\n\n\t\t// Draw play/pause icons\n\t\tif( this.playing ) {\n\t\t\tthis.context.fillStyle = '#fff';\n\t\t\tthis.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );\n\t\t\tthis.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );\n\t\t}\n\t\telse {\n\t\t\tthis.context.beginPath();\n\t\t\tthis.context.translate( 4, 0 );\n\t\t\tthis.context.moveTo( 0, 0 );\n\t\t\tthis.context.lineTo( iconSize - 4, iconSize / 2 );\n\t\t\tthis.context.lineTo( 0, iconSize );\n\t\t\tthis.context.fillStyle = '#fff';\n\t\t\tthis.context.fill();\n\t\t}\n\n\t\tthis.context.restore();\n\n\t}\n\n\ton( type, listener ) {\n\t\tthis.canvas.addEventListener( type, listener, false );\n\t}\n\n\toff( type, listener ) {\n\t\tthis.canvas.removeEventListener( type, listener, false );\n\t}\n\n\tdestroy() {\n\n\t\tthis.playing = false;\n\n\t\tif( this.canvas.parentNode ) {\n\t\t\tthis.container.removeChild( this.canvas );\n\t\t}\n\n\t}\n\n}","/**\n * The default reveal.js config object.\n */\nexport default {\n\n\t// The \"normal\" size of the presentation, aspect ratio will be preserved\n\t// when the presentation is scaled to fit different resolutions\n\twidth: 960,\n\theight: 700,\n\n\t// Factor of the display size that should remain empty around the content\n\tmargin: 0.04,\n\n\t// Bounds for smallest/largest possible scale to apply to content\n\tminScale: 0.2,\n\tmaxScale: 2.0,\n\n\t// Display presentation control arrows\n\tcontrols: true,\n\n\t// Help the user learn the controls by providing hints, for example by\n\t// bouncing the down arrow when they first encounter a vertical slide\n\tcontrolsTutorial: true,\n\n\t// Determines where controls appear, \"edges\" or \"bottom-right\"\n\tcontrolsLayout: 'bottom-right',\n\n\t// Visibility rule for backwards navigation arrows; \"faded\", \"hidden\"\n\t// or \"visible\"\n\tcontrolsBackArrows: 'faded',\n\n\t// Display a presentation progress bar\n\tprogress: true,\n\n\t// Display the page number of the current slide\n\t// - true:    Show slide number\n\t// - false:   Hide slide number\n\t//\n\t// Can optionally be set as a string that specifies the number formatting:\n\t// - \"h.v\":\t  Horizontal . vertical slide number (default)\n\t// - \"h/v\":\t  Horizontal / vertical slide number\n\t// - \"c\":\t  Flattened slide number\n\t// - \"c/t\":\t  Flattened slide number / total slides\n\t//\n\t// Alternatively, you can provide a function that returns the slide\n\t// number for the current slide. The function should take in a slide\n\t// object and return an array with one string [slideNumber] or\n\t// three strings [n1,delimiter,n2]. See #formatSlideNumber().\n\tslideNumber: false,\n\n\t// Can be used to limit the contexts in which the slide number appears\n\t// - \"all\":      Always show the slide number\n\t// - \"print\":    Only when printing to PDF\n\t// - \"speaker\":  Only in the speaker view\n\tshowSlideNumber: 'all',\n\n\t// Use 1 based indexing for # links to match slide number (default is zero\n\t// based)\n\thashOneBasedIndex: false,\n\n\t// Add the current slide number to the URL hash so that reloading the\n\t// page/copying the URL will return you to the same slide\n\thash: false,\n\n\t// Flags if we should monitor the hash and change slides accordingly\n\trespondToHashChanges: true,\n\n\t// Push each slide change to the browser history.  Implies `hash: true`\n\thistory: false,\n\n\t// Enable keyboard shortcuts for navigation\n\tkeyboard: true,\n\n\t// Optional function that blocks keyboard events when retuning false\n\t//\n\t// If you set this to 'focused', we will only capture keyboard events\n\t// for embedded decks when they are in focus\n\tkeyboardCondition: null,\n\n\t// Disables the default reveal.js slide layout (scaling and centering)\n\t// so that you can use custom CSS layout\n\tdisableLayout: false,\n\n\t// Enable the slide overview mode\n\toverview: true,\n\n\t// Vertical centering of slides\n\tcenter: true,\n\n\t// Enables touch navigation on devices with touch input\n\ttouch: true,\n\n\t// Loop the presentation\n\tloop: false,\n\n\t// Change the presentation direction to be RTL\n\trtl: false,\n\n\t// Changes the behavior of our navigation directions.\n\t//\n\t// \"default\"\n\t// Left/right arrow keys step between horizontal slides, up/down\n\t// arrow keys step between vertical slides. Space key steps through\n\t// all slides (both horizontal and vertical).\n\t//\n\t// \"linear\"\n\t// Removes the up/down arrows. Left/right arrows step through all\n\t// slides (both horizontal and vertical).\n\t//\n\t// \"grid\"\n\t// When this is enabled, stepping left/right from a vertical stack\n\t// to an adjacent vertical stack will land you at the same vertical\n\t// index.\n\t//\n\t// Consider a deck with six slides ordered in two vertical stacks:\n\t// 1.1    2.1\n\t// 1.2    2.2\n\t// 1.3    2.3\n\t//\n\t// If you're on slide 1.3 and navigate right, you will normally move\n\t// from 1.3 -> 2.1. If \"grid\" is used, the same navigation takes you\n\t// from 1.3 -> 2.3.\n\tnavigationMode: 'default',\n\n\t// Randomizes the order of slides each time the presentation loads\n\tshuffle: false,\n\n\t// Turns fragments on and off globally\n\tfragments: true,\n\n\t// Flags whether to include the current fragment in the URL,\n\t// so that reloading brings you to the same fragment position\n\tfragmentInURL: true,\n\n\t// Flags if the presentation is running in an embedded mode,\n\t// i.e. contained within a limited portion of the screen\n\tembedded: false,\n\n\t// Flags if we should show a help overlay when the question-mark\n\t// key is pressed\n\thelp: true,\n\n\t// Flags if it should be possible to pause the presentation (blackout)\n\tpause: true,\n\n\t// Flags if speaker notes should be visible to all viewers\n\tshowNotes: false,\n\n\t// Flags if slides with data-visibility=\"hidden\" should be kep visible\n\tshowHiddenSlides: false,\n\n\t// Global override for autoplaying embedded media (video/audio/iframe)\n\t// - null:   Media will only autoplay if data-autoplay is present\n\t// - true:   All media will autoplay, regardless of individual setting\n\t// - false:  No media will autoplay, regardless of individual setting\n\tautoPlayMedia: null,\n\n\t// Global override for preloading lazy-loaded iframes\n\t// - null:   Iframes with data-src AND data-preload will be loaded when within\n\t//           the viewDistance, iframes with only data-src will be loaded when visible\n\t// - true:   All iframes with data-src will be loaded when within the viewDistance\n\t// - false:  All iframes with data-src will be loaded only when visible\n\tpreloadIframes: null,\n\n\t// Can be used to globally disable auto-animation\n\tautoAnimate: true,\n\n\t// Optionally provide a custom element matcher that will be\n\t// used to dictate which elements we can animate between.\n\tautoAnimateMatcher: null,\n\n\t// Default settings for our auto-animate transitions, can be\n\t// overridden per-slide or per-element via data arguments\n\tautoAnimateEasing: 'ease',\n\tautoAnimateDuration: 1.0,\n\tautoAnimateUnmatched: true,\n\n\t// CSS properties that can be auto-animated. Position & scale\n\t// is matched separately so there's no need to include styles\n\t// like top/right/bottom/left, width/height or margin.\n\tautoAnimateStyles: [\n\t\t'opacity',\n\t\t'color',\n\t\t'background-color',\n\t\t'padding',\n\t\t'font-size',\n\t\t'line-height',\n\t\t'letter-spacing',\n\t\t'border-width',\n\t\t'border-color',\n\t\t'border-radius',\n\t\t'outline',\n\t\t'outline-offset'\n\t],\n\n\t// Controls automatic progression to the next slide\n\t// - 0:      Auto-sliding only happens if the data-autoslide HTML attribute\n\t//           is present on the current slide or fragment\n\t// - 1+:     All slides will progress automatically at the given interval\n\t// - false:  No auto-sliding, even if data-autoslide is present\n\tautoSlide: 0,\n\n\t// Stop auto-sliding after user input\n\tautoSlideStoppable: true,\n\n\t// Use this method for navigation when auto-sliding (defaults to navigateNext)\n\tautoSlideMethod: null,\n\n\t// Specify the average time in seconds that you think you will spend\n\t// presenting each slide. This is used to show a pacing timer in the\n\t// speaker view\n\tdefaultTiming: null,\n\n\t// Enable slide navigation via mouse wheel\n\tmouseWheel: false,\n\n\t// Opens links in an iframe preview overlay\n\t// Add `data-preview-link` and `data-preview-link=\"false\"` to customise each link\n\t// individually\n\tpreviewLinks: false,\n\n\t// Exposes the reveal.js API through window.postMessage\n\tpostMessage: true,\n\n\t// Dispatches all reveal.js events to the parent window through postMessage\n\tpostMessageEvents: false,\n\n\t// Focuses body when page changes visibility to ensure keyboard shortcuts work\n\tfocusBodyOnPageVisibilityChange: true,\n\n\t// Transition style\n\ttransition: 'slide', // none/fade/slide/convex/concave/zoom\n\n\t// Transition speed\n\ttransitionSpeed: 'default', // default/fast/slow\n\n\t// Transition style for full page slide backgrounds\n\tbackgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom\n\n\t// Parallax background image\n\tparallaxBackgroundImage: '', // CSS syntax, e.g. \"a.jpg\"\n\n\t// Parallax background size\n\tparallaxBackgroundSize: '', // CSS syntax, e.g. \"3000px 2000px\"\n\n\t// Parallax background repeat\n\tparallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit\n\n\t// Parallax background position\n\tparallaxBackgroundPosition: '', // CSS syntax, e.g. \"top left\"\n\n\t// Amount of pixels to move the parallax background per slide step\n\tparallaxBackgroundHorizontal: null,\n\tparallaxBackgroundVertical: null,\n\n\t// The maximum number of pages a single slide can expand onto when printing\n\t// to PDF, unlimited by default\n\tpdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,\n\n\t// Prints each fragment on a separate slide\n\tpdfSeparateFragments: true,\n\n\t// Offset used to reduce the height of content within exported PDF pages.\n\t// This exists to account for environment differences based on how you\n\t// print to PDF. CLI printing options, like phantomjs and wkpdf, can end\n\t// on precisely the total height of the document whereas in-browser\n\t// printing has to end one pixel before.\n\tpdfPageHeightOffset: -1,\n\n\t// Number of slides away from the current that are visible\n\tviewDistance: 3,\n\n\t// Number of slides away from the current that are visible on mobile\n\t// devices. It is advisable to set this to a lower number than\n\t// viewDistance in order to save resources.\n\tmobileViewDistance: 2,\n\n\t// The display mode that will be used to show slides\n\tdisplay: 'block',\n\n\t// Hide cursor if inactive\n\thideInactiveCursor: true,\n\n\t// Time before the cursor is hidden (in ms)\n\thideCursorTime: 5000,\n\n\t// Script dependencies to load\n\tdependencies: [],\n\n\t// Plugin objects to register and use for this presentation\n\tplugins: []\n\n}","import SlideContent from './controllers/slidecontent.js'\nimport SlideNumber from './controllers/slidenumber.js'\nimport Backgrounds from './controllers/backgrounds.js'\nimport AutoAnimate from './controllers/autoanimate.js'\nimport Fragments from './controllers/fragments.js'\nimport Overview from './controllers/overview.js'\nimport Keyboard from './controllers/keyboard.js'\nimport Location from './controllers/location.js'\nimport Controls from './controllers/controls.js'\nimport Progress from './controllers/progress.js'\nimport Pointer from './controllers/pointer.js'\nimport Plugins from './controllers/plugins.js'\nimport Print from './controllers/print.js'\nimport Touch from './controllers/touch.js'\nimport Focus from './controllers/focus.js'\nimport Notes from './controllers/notes.js'\nimport Playback from './components/playback.js'\nimport defaultConfig from './config.js'\nimport * as Util from './utils/util.js'\nimport * as Device from './utils/device.js'\nimport {\n\tSLIDES_SELECTOR,\n\tHORIZONTAL_SLIDES_SELECTOR,\n\tVERTICAL_SLIDES_SELECTOR,\n\tPOST_MESSAGE_METHOD_BLACKLIST\n} from './utils/constants.js'\n\n// The reveal.js version\nexport const VERSION = '4.3.1';\n\n/**\n * reveal.js\n * https://revealjs.com\n * MIT licensed\n *\n * Copyright (C) 2011-2022 Hakim El Hattab, https://hakim.se\n */\nexport default function( revealElement, options ) {\n\n\t// Support initialization with no args, one arg\n\t// [options] or two args [revealElement, options]\n\tif( arguments.length < 2 ) {\n\t\toptions = arguments[0];\n\t\trevealElement = document.querySelector( '.reveal' );\n\t}\n\n\tconst Reveal = {};\n\n\t// Configuration defaults, can be overridden at initialization time\n\tlet config = {},\n\n\t\t// Flags if reveal.js is loaded (has dispatched the 'ready' event)\n\t\tready = false,\n\n\t\t// The horizontal and vertical index of the currently active slide\n\t\tindexh,\n\t\tindexv,\n\n\t\t// The previous and current slide HTML elements\n\t\tpreviousSlide,\n\t\tcurrentSlide,\n\n\t\t// Remember which directions that the user has navigated towards\n\t\tnavigationHistory = {\n\t\t\thasNavigatedHorizontally: false,\n\t\t\thasNavigatedVertically: false\n\t\t},\n\n\t\t// Slides may have a data-state attribute which we pick up and apply\n\t\t// as a class to the body. This list contains the combined state of\n\t\t// all current slides.\n\t\tstate = [],\n\n\t\t// The current scale of the presentation (see width/height config)\n\t\tscale = 1,\n\n\t\t// CSS transform that is currently applied to the slides container,\n\t\t// split into two groups\n\t\tslidesTransform = { layout: '', overview: '' },\n\n\t\t// Cached references to DOM elements\n\t\tdom = {},\n\n\t\t// Flags if the interaction event listeners are bound\n\t\teventsAreBound = false,\n\n\t\t// The current slide transition state; idle or running\n\t\ttransition = 'idle',\n\n\t\t// The current auto-slide duration\n\t\tautoSlide = 0,\n\n\t\t// Auto slide properties\n\t\tautoSlidePlayer,\n\t\tautoSlideTimeout = 0,\n\t\tautoSlideStartTime = -1,\n\t\tautoSlidePaused = false,\n\n\t\t// Controllers for different aspects of our presentation. They're\n\t\t// all given direct references to this Reveal instance since there\n\t\t// may be multiple presentations running in parallel.\n\t\tslideContent = new SlideContent( Reveal ),\n\t\tslideNumber = new SlideNumber( Reveal ),\n\t\tautoAnimate = new AutoAnimate( Reveal ),\n\t\tbackgrounds = new Backgrounds( Reveal ),\n\t\tfragments = new Fragments( Reveal ),\n\t\toverview = new Overview( Reveal ),\n\t\tkeyboard = new Keyboard( Reveal ),\n\t\tlocation = new Location( Reveal ),\n\t\tcontrols = new Controls( Reveal ),\n\t\tprogress = new Progress( Reveal ),\n\t\tpointer = new Pointer( Reveal ),\n\t\tplugins = new Plugins( Reveal ),\n\t\tprint = new Print( Reveal ),\n\t\tfocus = new Focus( Reveal ),\n\t\ttouch = new Touch( Reveal ),\n\t\tnotes = new Notes( Reveal );\n\n\t/**\n\t * Starts up the presentation.\n\t */\n\tfunction initialize( initOptions ) {\n\n\t\tif( !revealElement ) throw 'Unable to find presentation root (<div class=\"reveal\">).';\n\n\t\t// Cache references to key DOM elements\n\t\tdom.wrapper = revealElement;\n\t\tdom.slides = revealElement.querySelector( '.slides' );\n\n\t\tif( !dom.slides ) throw 'Unable to find slides container (<div class=\"slides\">).';\n\n\t\t// Compose our config object in order of increasing precedence:\n\t\t// 1. Default reveal.js options\n\t\t// 2. Options provided via Reveal.configure() prior to\n\t\t//    initialization\n\t\t// 3. Options passed to the Reveal constructor\n\t\t// 4. Options passed to Reveal.initialize\n\t\t// 5. Query params\n\t\tconfig = { ...defaultConfig, ...config, ...options, ...initOptions, ...Util.getQueryHash() };\n\n\t\tsetViewport();\n\n\t\t// Force a layout when the whole page, incl fonts, has loaded\n\t\twindow.addEventListener( 'load', layout, false );\n\n\t\t// Register plugins and load dependencies, then move on to #start()\n\t\tplugins.load( config.plugins, config.dependencies ).then( start );\n\n\t\treturn new Promise( resolve => Reveal.on( 'ready', resolve ) );\n\n\t}\n\n\t/**\n\t * Encase the presentation in a reveal.js viewport. The\n\t * extent of the viewport differs based on configuration.\n\t */\n\tfunction setViewport() {\n\n\t\t// Embedded decks use the reveal element as their viewport\n\t\tif( config.embedded === true ) {\n\t\t\tdom.viewport = Util.closest( revealElement, '.reveal-viewport' ) || revealElement;\n\t\t}\n\t\t// Full-page decks use the body as their viewport\n\t\telse {\n\t\t\tdom.viewport = document.body;\n\t\t\tdocument.documentElement.classList.add( 'reveal-full-page' );\n\t\t}\n\n\t\tdom.viewport.classList.add( 'reveal-viewport' );\n\n\t}\n\n\t/**\n\t * Starts up reveal.js by binding input events and navigating\n\t * to the current URL deeplink if there is one.\n\t */\n\tfunction start() {\n\n\t\tready = true;\n\n\t\t// Remove slides hidden with data-visibility\n\t\tremoveHiddenSlides();\n\n\t\t// Make sure we've got all the DOM elements we need\n\t\tsetupDOM();\n\n\t\t// Listen to messages posted to this window\n\t\tsetupPostMessage();\n\n\t\t// Prevent the slides from being scrolled out of view\n\t\tsetupScrollPrevention();\n\n\t\t// Adds bindings for fullscreen mode\n\t\tsetupFullscreen();\n\n\t\t// Resets all vertical slides so that only the first is visible\n\t\tresetVerticalSlides();\n\n\t\t// Updates the presentation to match the current configuration values\n\t\tconfigure();\n\n\t\t// Read the initial hash\n\t\tlocation.readURL();\n\n\t\t// Create slide backgrounds\n\t\tbackgrounds.update( true );\n\n\t\t// Notify listeners that the presentation is ready but use a 1ms\n\t\t// timeout to ensure it's not fired synchronously after #initialize()\n\t\tsetTimeout( () => {\n\t\t\t// Enable transitions now that we're loaded\n\t\t\tdom.slides.classList.remove( 'no-transition' );\n\n\t\t\tdom.wrapper.classList.add( 'ready' );\n\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'ready',\n\t\t\t\tdata: {\n\t\t\t\t\tindexh,\n\t\t\t\t\tindexv,\n\t\t\t\t\tcurrentSlide\n\t\t\t\t}\n\t\t\t});\n\t\t}, 1 );\n\n\t\t// Special setup and config is required when printing to PDF\n\t\tif( print.isPrintingPDF() ) {\n\t\t\tremoveEventListeners();\n\n\t\t\t// The document needs to have loaded for the PDF layout\n\t\t\t// measurements to be accurate\n\t\t\tif( document.readyState === 'complete' ) {\n\t\t\t\tprint.setupPDF();\n\t\t\t}\n\t\t\telse {\n\t\t\t\twindow.addEventListener( 'load', () => {\n\t\t\t\t\tprint.setupPDF();\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Removes all slides with data-visibility=\"hidden\". This\n\t * is done right before the rest of the presentation is\n\t * initialized.\n\t *\n\t * If you want to show all hidden slides, initialize\n\t * reveal.js with showHiddenSlides set to true.\n\t */\n\tfunction removeHiddenSlides() {\n\n\t\tif( !config.showHiddenSlides ) {\n\t\t\tUtil.queryAll( dom.wrapper, 'section[data-visibility=\"hidden\"]' ).forEach( slide => {\n\t\t\t\tslide.parentNode.removeChild( slide );\n\t\t\t} );\n\t\t}\n\n\t}\n\n\t/**\n\t * Finds and stores references to DOM elements which are\n\t * required by the presentation. If a required element is\n\t * not found, it is created.\n\t */\n\tfunction setupDOM() {\n\n\t\t// Prevent transitions while we're loading\n\t\tdom.slides.classList.add( 'no-transition' );\n\n\t\tif( Device.isMobile ) {\n\t\t\tdom.wrapper.classList.add( 'no-hover' );\n\t\t}\n\t\telse {\n\t\t\tdom.wrapper.classList.remove( 'no-hover' );\n\t\t}\n\n\t\tbackgrounds.render();\n\t\tslideNumber.render();\n\t\tcontrols.render();\n\t\tprogress.render();\n\t\tnotes.render();\n\n\t\t// Overlay graphic which is displayed during the paused mode\n\t\tdom.pauseOverlay = Util.createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class=\"resume-button\">Resume presentation</button>' : null );\n\n\t\tdom.statusElement = createStatusElement();\n\n\t\tdom.wrapper.setAttribute( 'role', 'application' );\n\t}\n\n\t/**\n\t * Creates a hidden div with role aria-live to announce the\n\t * current slide content. Hide the div off-screen to make it\n\t * available only to Assistive Technologies.\n\t *\n\t * @return {HTMLElement}\n\t */\n\tfunction createStatusElement() {\n\n\t\tlet statusElement = dom.wrapper.querySelector( '.aria-status' );\n\t\tif( !statusElement ) {\n\t\t\tstatusElement = document.createElement( 'div' );\n\t\t\tstatusElement.style.position = 'absolute';\n\t\t\tstatusElement.style.height = '1px';\n\t\t\tstatusElement.style.width = '1px';\n\t\t\tstatusElement.style.overflow = 'hidden';\n\t\t\tstatusElement.style.clip = 'rect( 1px, 1px, 1px, 1px )';\n\t\t\tstatusElement.classList.add( 'aria-status' );\n\t\t\tstatusElement.setAttribute( 'aria-live', 'polite' );\n\t\t\tstatusElement.setAttribute( 'aria-atomic','true' );\n\t\t\tdom.wrapper.appendChild( statusElement );\n\t\t}\n\t\treturn statusElement;\n\n\t}\n\n\t/**\n\t * Announces the given text to screen readers.\n\t */\n\tfunction announceStatus( value ) {\n\n\t\tdom.statusElement.textContent = value;\n\n\t}\n\n\t/**\n\t * Converts the given HTML element into a string of text\n\t * that can be announced to a screen reader. Hidden\n\t * elements are excluded.\n\t */\n\tfunction getStatusText( node ) {\n\n\t\tlet text = '';\n\n\t\t// Text node\n\t\tif( node.nodeType === 3 ) {\n\t\t\ttext += node.textContent;\n\t\t}\n\t\t// Element node\n\t\telse if( node.nodeType === 1 ) {\n\n\t\t\tlet isAriaHidden = node.getAttribute( 'aria-hidden' );\n\t\t\tlet isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';\n\t\t\tif( isAriaHidden !== 'true' && !isDisplayHidden ) {\n\n\t\t\t\tArray.from( node.childNodes ).forEach( child => {\n\t\t\t\t\ttext += getStatusText( child );\n\t\t\t\t} );\n\n\t\t\t}\n\n\t\t}\n\n\t\ttext = text.trim();\n\n\t\treturn text === '' ? '' : text + ' ';\n\n\t}\n\n\t/**\n\t * This is an unfortunate necessity. Some actions – such as\n\t * an input field being focused in an iframe or using the\n\t * keyboard to expand text selection beyond the bounds of\n\t * a slide – can trigger our content to be pushed out of view.\n\t * This scrolling can not be prevented by hiding overflow in\n\t * CSS (we already do) so we have to resort to repeatedly\n\t * checking if the slides have been offset :(\n\t */\n\tfunction setupScrollPrevention() {\n\n\t\tsetInterval( () => {\n\t\t\tif( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {\n\t\t\t\tdom.wrapper.scrollTop = 0;\n\t\t\t\tdom.wrapper.scrollLeft = 0;\n\t\t\t}\n\t\t}, 1000 );\n\n\t}\n\n\t/**\n\t * After entering fullscreen we need to force a layout to\n\t * get our presentations to scale correctly. This behavior\n\t * is inconsistent across browsers but a force layout seems\n\t * to normalize it.\n\t */\n\tfunction setupFullscreen() {\n\n\t\tdocument.addEventListener( 'fullscreenchange', onFullscreenChange );\n\t\tdocument.addEventListener( 'webkitfullscreenchange', onFullscreenChange );\n\n\t}\n\n\t/**\n\t * Registers a listener to postMessage events, this makes it\n\t * possible to call all reveal.js API methods from another\n\t * window. For example:\n\t *\n\t * revealWindow.postMessage( JSON.stringify({\n\t *   method: 'slide',\n\t *   args: [ 2 ]\n\t * }), '*' );\n\t */\n\tfunction setupPostMessage() {\n\n\t\tif( config.postMessage ) {\n\t\t\twindow.addEventListener( 'message', onPostMessage, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Applies the configuration settings from the config\n\t * object. May be called multiple times.\n\t *\n\t * @param {object} options\n\t */\n\tfunction configure( options ) {\n\n\t\tconst oldConfig = { ...config }\n\n\t\t// New config options may be passed when this method\n\t\t// is invoked through the API after initialization\n\t\tif( typeof options === 'object' ) Util.extend( config, options );\n\n\t\t// Abort if reveal.js hasn't finished loading, config\n\t\t// changes will be applied automatically once ready\n\t\tif( Reveal.isReady() ===  false ) return;\n\n\t\tconst numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;\n\n\t\t// The transition is added as a class on the .reveal element\n\t\tdom.wrapper.classList.remove( oldConfig.transition );\n\t\tdom.wrapper.classList.add( config.transition );\n\n\t\tdom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );\n\t\tdom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );\n\n\t\t// Expose our configured slide dimensions as custom props\n\t\tdom.viewport.style.setProperty( '--slide-width', config.width + 'px' );\n\t\tdom.viewport.style.setProperty( '--slide-height', config.height + 'px' );\n\n\t\tif( config.shuffle ) {\n\t\t\tshuffle();\n\t\t}\n\n\t\tUtil.toggleClass( dom.wrapper, 'embedded', config.embedded );\n\t\tUtil.toggleClass( dom.wrapper, 'rtl', config.rtl );\n\t\tUtil.toggleClass( dom.wrapper, 'center', config.center );\n\n\t\t// Exit the paused mode if it was configured off\n\t\tif( config.pause === false ) {\n\t\t\tresume();\n\t\t}\n\n\t\t// Iframe link previews\n\t\tif( config.previewLinks ) {\n\t\t\tenablePreviewLinks();\n\t\t\tdisablePreviewLinks( '[data-preview-link=false]' );\n\t\t}\n\t\telse {\n\t\t\tdisablePreviewLinks();\n\t\t\tenablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );\n\t\t}\n\n\t\t// Reset all changes made by auto-animations\n\t\tautoAnimate.reset();\n\n\t\t// Remove existing auto-slide controls\n\t\tif( autoSlidePlayer ) {\n\t\t\tautoSlidePlayer.destroy();\n\t\t\tautoSlidePlayer = null;\n\t\t}\n\n\t\t// Generate auto-slide controls if needed\n\t\tif( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable ) {\n\t\t\tautoSlidePlayer = new Playback( dom.wrapper, () => {\n\t\t\t\treturn Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );\n\t\t\t} );\n\n\t\t\tautoSlidePlayer.on( 'click', onAutoSlidePlayerClick );\n\t\t\tautoSlidePaused = false;\n\t\t}\n\n\t\t// Add the navigation mode to the DOM so we can adjust styling\n\t\tif( config.navigationMode !== 'default' ) {\n\t\t\tdom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );\n\t\t}\n\t\telse {\n\t\t\tdom.wrapper.removeAttribute( 'data-navigation-mode' );\n\t\t}\n\n\t\tnotes.configure( config, oldConfig );\n\t\tfocus.configure( config, oldConfig );\n\t\tpointer.configure( config, oldConfig );\n\t\tcontrols.configure( config, oldConfig );\n\t\tprogress.configure( config, oldConfig );\n\t\tkeyboard.configure( config, oldConfig );\n\t\tfragments.configure( config, oldConfig );\n\t\tslideNumber.configure( config, oldConfig );\n\n\t\tsync();\n\n\t}\n\n\t/**\n\t * Binds all event listeners.\n\t */\n\tfunction addEventListeners() {\n\n\t\teventsAreBound = true;\n\n\t\twindow.addEventListener( 'resize', onWindowResize, false );\n\n\t\tif( config.touch ) touch.bind();\n\t\tif( config.keyboard ) keyboard.bind();\n\t\tif( config.progress ) progress.bind();\n\t\tif( config.respondToHashChanges ) location.bind();\n\t\tcontrols.bind();\n\t\tfocus.bind();\n\n\t\tdom.slides.addEventListener( 'click', onSlidesClicked, false );\n\t\tdom.slides.addEventListener( 'transitionend', onTransitionEnd, false );\n\t\tdom.pauseOverlay.addEventListener( 'click', resume, false );\n\n\t\tif( config.focusBodyOnPageVisibilityChange ) {\n\t\t\tdocument.addEventListener( 'visibilitychange', onPageVisibilityChange, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Unbinds all event listeners.\n\t */\n\tfunction removeEventListeners() {\n\n\t\teventsAreBound = false;\n\n\t\ttouch.unbind();\n\t\tfocus.unbind();\n\t\tkeyboard.unbind();\n\t\tcontrols.unbind();\n\t\tprogress.unbind();\n\t\tlocation.unbind();\n\n\t\twindow.removeEventListener( 'resize', onWindowResize, false );\n\n\t\tdom.slides.removeEventListener( 'click', onSlidesClicked, false );\n\t\tdom.slides.removeEventListener( 'transitionend', onTransitionEnd, false );\n\t\tdom.pauseOverlay.removeEventListener( 'click', resume, false );\n\n\t}\n\n\t/**\n\t * Uninitializes reveal.js by undoing changes made to the\n\t * DOM and removing all event listeners.\n\t */\n\tfunction destroy() {\n\n\t\tremoveEventListeners();\n\t\tcancelAutoSlide();\n\t\tdisablePreviewLinks();\n\n\t\t// Destroy controllers\n\t\tnotes.destroy();\n\t\tfocus.destroy();\n\t\tplugins.destroy();\n\t\tpointer.destroy();\n\t\tcontrols.destroy();\n\t\tprogress.destroy();\n\t\tbackgrounds.destroy();\n\t\tslideNumber.destroy();\n\n\t\t// Remove event listeners\n\t\tdocument.removeEventListener( 'fullscreenchange', onFullscreenChange );\n\t\tdocument.removeEventListener( 'webkitfullscreenchange', onFullscreenChange );\n\t\tdocument.removeEventListener( 'visibilitychange', onPageVisibilityChange, false );\n\t\twindow.removeEventListener( 'message', onPostMessage, false );\n\t\twindow.removeEventListener( 'load', layout, false );\n\n\t\t// Undo DOM changes\n\t\tif( dom.pauseOverlay ) dom.pauseOverlay.remove();\n\t\tif( dom.statusElement ) dom.statusElement.remove();\n\n\t\tdocument.documentElement.classList.remove( 'reveal-full-page' );\n\n\t\tdom.wrapper.classList.remove( 'ready', 'center', 'has-horizontal-slides', 'has-vertical-slides' );\n\t\tdom.wrapper.removeAttribute( 'data-transition-speed' );\n\t\tdom.wrapper.removeAttribute( 'data-background-transition' );\n\n\t\tdom.viewport.classList.remove( 'reveal-viewport' );\n\t\tdom.viewport.style.removeProperty( '--slide-width' );\n\t\tdom.viewport.style.removeProperty( '--slide-height' );\n\n\t\tdom.slides.style.removeProperty( 'width' );\n\t\tdom.slides.style.removeProperty( 'height' );\n\t\tdom.slides.style.removeProperty( 'zoom' );\n\t\tdom.slides.style.removeProperty( 'left' );\n\t\tdom.slides.style.removeProperty( 'top' );\n\t\tdom.slides.style.removeProperty( 'bottom' );\n\t\tdom.slides.style.removeProperty( 'right' );\n\t\tdom.slides.style.removeProperty( 'transform' );\n\n\t\tArray.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( slide => {\n\t\t\tslide.style.removeProperty( 'display' );\n\t\t\tslide.style.removeProperty( 'top' );\n\t\t\tslide.removeAttribute( 'hidden' );\n\t\t\tslide.removeAttribute( 'aria-hidden' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Adds a listener to one of our custom reveal.js events,\n\t * like slidechanged.\n\t */\n\tfunction on( type, listener, useCapture ) {\n\n\t\trevealElement.addEventListener( type, listener, useCapture );\n\n\t}\n\n\t/**\n\t * Unsubscribes from a reveal.js event.\n\t */\n\tfunction off( type, listener, useCapture ) {\n\n\t\trevealElement.removeEventListener( type, listener, useCapture );\n\n\t}\n\n\t/**\n\t * Applies CSS transforms to the slides container. The container\n\t * is transformed from two separate sources: layout and the overview\n\t * mode.\n\t *\n\t * @param {object} transforms\n\t */\n\tfunction transformSlides( transforms ) {\n\n\t\t// Pick up new transforms from arguments\n\t\tif( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;\n\t\tif( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;\n\n\t\t// Apply the transforms to the slides container\n\t\tif( slidesTransform.layout ) {\n\t\t\tUtil.transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );\n\t\t}\n\t\telse {\n\t\t\tUtil.transformElement( dom.slides, slidesTransform.overview );\n\t\t}\n\n\t}\n\n\t/**\n\t * Dispatches an event of the specified type from the\n\t * reveal DOM element.\n\t */\n\tfunction dispatchEvent({ target=dom.wrapper, type, data, bubbles=true }) {\n\n\t\tlet event = document.createEvent( 'HTMLEvents', 1, 2 );\n\t\tevent.initEvent( type, bubbles, true );\n\t\tUtil.extend( event, data );\n\t\ttarget.dispatchEvent( event );\n\n\t\tif( target === dom.wrapper ) {\n\t\t\t// If we're in an iframe, post each reveal.js event to the\n\t\t\t// parent window. Used by the notes plugin\n\t\t\tdispatchPostMessage( type );\n\t\t}\n\n\t\treturn event;\n\n\t}\n\n\t/**\n\t * Dispatched a postMessage of the given type from our window.\n\t */\n\tfunction dispatchPostMessage( type, data ) {\n\n\t\tif( config.postMessageEvents && window.parent !== window.self ) {\n\t\t\tlet message = {\n\t\t\t\tnamespace: 'reveal',\n\t\t\t\teventName: type,\n\t\t\t\tstate: getState()\n\t\t\t};\n\n\t\t\tUtil.extend( message, data );\n\n\t\t\twindow.parent.postMessage( JSON.stringify( message ), '*' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Bind preview frame links.\n\t *\n\t * @param {string} [selector=a] - selector for anchors\n\t */\n\tfunction enablePreviewLinks( selector = 'a' ) {\n\n\t\tArray.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {\n\t\t\tif( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {\n\t\t\t\telement.addEventListener( 'click', onPreviewLinkClicked, false );\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Unbind preview frame links.\n\t */\n\tfunction disablePreviewLinks( selector = 'a' ) {\n\n\t\tArray.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {\n\t\t\tif( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {\n\t\t\t\telement.removeEventListener( 'click', onPreviewLinkClicked, false );\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Opens a preview window for the target URL.\n\t *\n\t * @param {string} url - url for preview iframe src\n\t */\n\tfunction showPreview( url ) {\n\n\t\tcloseOverlay();\n\n\t\tdom.overlay = document.createElement( 'div' );\n\t\tdom.overlay.classList.add( 'overlay' );\n\t\tdom.overlay.classList.add( 'overlay-preview' );\n\t\tdom.wrapper.appendChild( dom.overlay );\n\n\t\tdom.overlay.innerHTML =\n\t\t\t`<header>\n\t\t\t\t<a class=\"close\" href=\"#\"><span class=\"icon\"></span></a>\n\t\t\t\t<a class=\"external\" href=\"${url}\" target=\"_blank\"><span class=\"icon\"></span></a>\n\t\t\t</header>\n\t\t\t<div class=\"spinner\"></div>\n\t\t\t<div class=\"viewport\">\n\t\t\t\t<iframe src=\"${url}\"></iframe>\n\t\t\t\t<small class=\"viewport-inner\">\n\t\t\t\t\t<span class=\"x-frame-error\">Unable to load iframe. This is likely due to the site's policy (x-frame-options).</span>\n\t\t\t\t</small>\n\t\t\t</div>`;\n\n\t\tdom.overlay.querySelector( 'iframe' ).addEventListener( 'load', event => {\n\t\t\tdom.overlay.classList.add( 'loaded' );\n\t\t}, false );\n\n\t\tdom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {\n\t\t\tcloseOverlay();\n\t\t\tevent.preventDefault();\n\t\t}, false );\n\n\t\tdom.overlay.querySelector( '.external' ).addEventListener( 'click', event => {\n\t\t\tcloseOverlay();\n\t\t}, false );\n\n\t}\n\n\t/**\n\t * Open or close help overlay window.\n\t *\n\t * @param {Boolean} [override] Flag which overrides the\n\t * toggle logic and forcibly sets the desired state. True means\n\t * help is open, false means it's closed.\n\t */\n\tfunction toggleHelp( override ){\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? showHelp() : closeOverlay();\n\t\t}\n\t\telse {\n\t\t\tif( dom.overlay ) {\n\t\t\t\tcloseOverlay();\n\t\t\t}\n\t\t\telse {\n\t\t\t\tshowHelp();\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Opens an overlay window with help material.\n\t */\n\tfunction showHelp() {\n\n\t\tif( config.help ) {\n\n\t\t\tcloseOverlay();\n\n\t\t\tdom.overlay = document.createElement( 'div' );\n\t\t\tdom.overlay.classList.add( 'overlay' );\n\t\t\tdom.overlay.classList.add( 'overlay-help' );\n\t\t\tdom.wrapper.appendChild( dom.overlay );\n\n\t\t\tlet html = '<p class=\"title\">Keyboard Shortcuts</p><br/>';\n\n\t\t\tlet shortcuts = keyboard.getShortcuts(),\n\t\t\t\tbindings = keyboard.getBindings();\n\n\t\t\thtml += '<table><th>KEY</th><th>ACTION</th>';\n\t\t\tfor( let key in shortcuts ) {\n\t\t\t\thtml += `<tr><td>${key}</td><td>${shortcuts[ key ]}</td></tr>`;\n\t\t\t}\n\n\t\t\t// Add custom key bindings that have associated descriptions\n\t\t\tfor( let binding in bindings ) {\n\t\t\t\tif( bindings[binding].key && bindings[binding].description ) {\n\t\t\t\t\thtml += `<tr><td>${bindings[binding].key}</td><td>${bindings[binding].description}</td></tr>`;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\thtml += '</table>';\n\n\t\t\tdom.overlay.innerHTML = `\n\t\t\t\t<header>\n\t\t\t\t\t<a class=\"close\" href=\"#\"><span class=\"icon\"></span></a>\n\t\t\t\t</header>\n\t\t\t\t<div class=\"viewport\">\n\t\t\t\t\t<div class=\"viewport-inner\">${html}</div>\n\t\t\t\t</div>\n\t\t\t`;\n\n\t\t\tdom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {\n\t\t\t\tcloseOverlay();\n\t\t\t\tevent.preventDefault();\n\t\t\t}, false );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Closes any currently open overlay.\n\t */\n\tfunction closeOverlay() {\n\n\t\tif( dom.overlay ) {\n\t\t\tdom.overlay.parentNode.removeChild( dom.overlay );\n\t\t\tdom.overlay = null;\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Applies JavaScript-controlled layout rules to the\n\t * presentation.\n\t */\n\tfunction layout() {\n\n\t\tif( dom.wrapper && !print.isPrintingPDF() ) {\n\n\t\t\tif( !config.disableLayout ) {\n\n\t\t\t\t// On some mobile devices '100vh' is taller than the visible\n\t\t\t\t// viewport which leads to part of the presentation being\n\t\t\t\t// cut off. To work around this we define our own '--vh' custom\n\t\t\t\t// property where 100x adds up to the correct height.\n\t\t\t\t//\n\t\t\t\t// https://css-tricks.com/the-trick-to-viewport-units-on-mobile/\n\t\t\t\tif( Device.isMobile && !config.embedded ) {\n\t\t\t\t\tdocument.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );\n\t\t\t\t}\n\n\t\t\t\tconst size = getComputedSlideSize();\n\n\t\t\t\tconst oldScale = scale;\n\n\t\t\t\t// Layout the contents of the slides\n\t\t\t\tlayoutSlideContents( config.width, config.height );\n\n\t\t\t\tdom.slides.style.width = size.width + 'px';\n\t\t\t\tdom.slides.style.height = size.height + 'px';\n\n\t\t\t\t// Determine scale of content to fit within available space\n\t\t\t\tscale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );\n\n\t\t\t\t// Respect max/min scale settings\n\t\t\t\tscale = Math.max( scale, config.minScale );\n\t\t\t\tscale = Math.min( scale, config.maxScale );\n\n\t\t\t\t// Don't apply any scaling styles if scale is 1\n\t\t\t\tif( scale === 1 ) {\n\t\t\t\t\tdom.slides.style.zoom = '';\n\t\t\t\t\tdom.slides.style.left = '';\n\t\t\t\t\tdom.slides.style.top = '';\n\t\t\t\t\tdom.slides.style.bottom = '';\n\t\t\t\t\tdom.slides.style.right = '';\n\t\t\t\t\ttransformSlides( { layout: '' } );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tdom.slides.style.zoom = '';\n\t\t\t\t\tdom.slides.style.left = '50%';\n\t\t\t\t\tdom.slides.style.top = '50%';\n\t\t\t\t\tdom.slides.style.bottom = 'auto';\n\t\t\t\t\tdom.slides.style.right = 'auto';\n\t\t\t\t\ttransformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );\n\t\t\t\t}\n\n\t\t\t\t// Select all slides, vertical and horizontal\n\t\t\t\tconst slides = Array.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );\n\n\t\t\t\tfor( let i = 0, len = slides.length; i < len; i++ ) {\n\t\t\t\t\tconst slide = slides[ i ];\n\n\t\t\t\t\t// Don't bother updating invisible slides\n\t\t\t\t\tif( slide.style.display === 'none' ) {\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\tif( config.center || slide.classList.contains( 'center' ) ) {\n\t\t\t\t\t\t// Vertical stacks are not centred since their section\n\t\t\t\t\t\t// children will be\n\t\t\t\t\t\tif( slide.classList.contains( 'stack' ) ) {\n\t\t\t\t\t\t\tslide.style.top = 0;\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tslide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tslide.style.top = '';\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tif( oldScale !== scale ) {\n\t\t\t\t\tdispatchEvent({\n\t\t\t\t\t\ttype: 'resize',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\toldScale,\n\t\t\t\t\t\t\tscale,\n\t\t\t\t\t\t\tsize\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdom.viewport.style.setProperty( '--slide-scale', scale );\n\n\t\t\tprogress.update();\n\t\t\tbackgrounds.updateParallax();\n\n\t\t\tif( overview.isActive() ) {\n\t\t\t\toverview.update();\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Applies layout logic to the contents of all slides in\n\t * the presentation.\n\t *\n\t * @param {string|number} width\n\t * @param {string|number} height\n\t */\n\tfunction layoutSlideContents( width, height ) {\n\n\t\t// Handle sizing of elements with the 'r-stretch' class\n\t\tUtil.queryAll( dom.slides, 'section > .stretch, section > .r-stretch' ).forEach( element => {\n\n\t\t\t// Determine how much vertical space we can use\n\t\t\tlet remainingHeight = Util.getRemainingHeight( element, height );\n\n\t\t\t// Consider the aspect ratio of media elements\n\t\t\tif( /(img|video)/gi.test( element.nodeName ) ) {\n\t\t\t\tconst nw = element.naturalWidth || element.videoWidth,\n\t\t\t\t\t  nh = element.naturalHeight || element.videoHeight;\n\n\t\t\t\tconst es = Math.min( width / nw, remainingHeight / nh );\n\n\t\t\t\telement.style.width = ( nw * es ) + 'px';\n\t\t\t\telement.style.height = ( nh * es ) + 'px';\n\n\t\t\t}\n\t\t\telse {\n\t\t\t\telement.style.width = width + 'px';\n\t\t\t\telement.style.height = remainingHeight + 'px';\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Calculates the computed pixel size of our slides. These\n\t * values are based on the width and height configuration\n\t * options.\n\t *\n\t * @param {number} [presentationWidth=dom.wrapper.offsetWidth]\n\t * @param {number} [presentationHeight=dom.wrapper.offsetHeight]\n\t */\n\tfunction getComputedSlideSize( presentationWidth, presentationHeight ) {\n\n\t\tconst size = {\n\t\t\t// Slide size\n\t\t\twidth: config.width,\n\t\t\theight: config.height,\n\n\t\t\t// Presentation size\n\t\t\tpresentationWidth: presentationWidth || dom.wrapper.offsetWidth,\n\t\t\tpresentationHeight: presentationHeight || dom.wrapper.offsetHeight\n\t\t};\n\n\t\t// Reduce available space by margin\n\t\tsize.presentationWidth -= ( size.presentationWidth * config.margin );\n\t\tsize.presentationHeight -= ( size.presentationHeight * config.margin );\n\n\t\t// Slide width may be a percentage of available width\n\t\tif( typeof size.width === 'string' && /%$/.test( size.width ) ) {\n\t\t\tsize.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;\n\t\t}\n\n\t\t// Slide height may be a percentage of available height\n\t\tif( typeof size.height === 'string' && /%$/.test( size.height ) ) {\n\t\t\tsize.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;\n\t\t}\n\n\t\treturn size;\n\n\t}\n\n\t/**\n\t * Stores the vertical index of a stack so that the same\n\t * vertical slide can be selected when navigating to and\n\t * from the stack.\n\t *\n\t * @param {HTMLElement} stack The vertical stack element\n\t * @param {string|number} [v=0] Index to memorize\n\t */\n\tfunction setPreviousVerticalIndex( stack, v ) {\n\n\t\tif( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {\n\t\t\tstack.setAttribute( 'data-previous-indexv', v || 0 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Retrieves the vertical index which was stored using\n\t * #setPreviousVerticalIndex() or 0 if no previous index\n\t * exists.\n\t *\n\t * @param {HTMLElement} stack The vertical stack element\n\t */\n\tfunction getPreviousVerticalIndex( stack ) {\n\n\t\tif( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {\n\t\t\t// Prefer manually defined start-indexv\n\t\t\tconst attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';\n\n\t\t\treturn parseInt( stack.getAttribute( attributeName ) || 0, 10 );\n\t\t}\n\n\t\treturn 0;\n\n\t}\n\n\t/**\n\t * Checks if the current or specified slide is vertical\n\t * (nested within another slide).\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide to check\n\t * orientation of\n\t * @return {Boolean}\n\t */\n\tfunction isVerticalSlide( slide = currentSlide ) {\n\n\t\treturn slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );\n\n\t}\n\n\t/**\n\t * Returns true if we're on the last slide in the current\n\t * vertical stack.\n\t */\n\tfunction isLastVerticalSlide() {\n\n\t\tif( currentSlide && isVerticalSlide( currentSlide ) ) {\n\t\t\t// Does this slide have a next sibling?\n\t\t\tif( currentSlide.nextElementSibling ) return false;\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Returns true if we're currently on the first slide in\n\t * the presentation.\n\t */\n\tfunction isFirstSlide() {\n\n\t\treturn indexh === 0 && indexv === 0;\n\n\t}\n\n\t/**\n\t * Returns true if we're currently on the last slide in\n\t * the presenation. If the last slide is a stack, we only\n\t * consider this the last slide if it's at the end of the\n\t * stack.\n\t */\n\tfunction isLastSlide() {\n\n\t\tif( currentSlide ) {\n\t\t\t// Does this slide have a next sibling?\n\t\t\tif( currentSlide.nextElementSibling ) return false;\n\n\t\t\t// If it's vertical, does its parent have a next sibling?\n\t\t\tif( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Enters the paused mode which fades everything on screen to\n\t * black.\n\t */\n\tfunction pause() {\n\n\t\tif( config.pause ) {\n\t\t\tconst wasPaused = dom.wrapper.classList.contains( 'paused' );\n\n\t\t\tcancelAutoSlide();\n\t\t\tdom.wrapper.classList.add( 'paused' );\n\n\t\t\tif( wasPaused === false ) {\n\t\t\t\tdispatchEvent({ type: 'paused' });\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Exits from the paused mode.\n\t */\n\tfunction resume() {\n\n\t\tconst wasPaused = dom.wrapper.classList.contains( 'paused' );\n\t\tdom.wrapper.classList.remove( 'paused' );\n\n\t\tcueAutoSlide();\n\n\t\tif( wasPaused ) {\n\t\t\tdispatchEvent({ type: 'resumed' });\n\t\t}\n\n\t}\n\n\t/**\n\t * Toggles the paused mode on and off.\n\t */\n\tfunction togglePause( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? pause() : resume();\n\t\t}\n\t\telse {\n\t\t\tisPaused() ? resume() : pause();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if we are currently in the paused mode.\n\t *\n\t * @return {Boolean}\n\t */\n\tfunction isPaused() {\n\n\t\treturn dom.wrapper.classList.contains( 'paused' );\n\n\t}\n\n\t/**\n\t * Toggles the auto slide mode on and off.\n\t *\n\t * @param {Boolean} [override] Flag which sets the desired state.\n\t * True means autoplay starts, false means it stops.\n\t */\n\n\tfunction toggleAutoSlide( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? resumeAutoSlide() : pauseAutoSlide();\n\t\t}\n\n\t\telse {\n\t\t\tautoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if the auto slide mode is currently on.\n\t *\n\t * @return {Boolean}\n\t */\n\tfunction isAutoSliding() {\n\n\t\treturn !!( autoSlide && !autoSlidePaused );\n\n\t}\n\n\t/**\n\t * Steps from the current point in the presentation to the\n\t * slide which matches the specified horizontal and vertical\n\t * indices.\n\t *\n\t * @param {number} [h=indexh] Horizontal index of the target slide\n\t * @param {number} [v=indexv] Vertical index of the target slide\n\t * @param {number} [f] Index of a fragment within the\n\t * target slide to activate\n\t * @param {number} [origin] Origin for use in multimaster environments\n\t */\n\tfunction slide( h, v, f, origin ) {\n\n\t\t// Dispatch an event before hte slide\n\t\tconst slidechange = dispatchEvent({\n\t\t\ttype: 'beforeslidechange',\n\t\t\tdata: {\n\t\t\t\tindexh: h === undefined ? indexh : h,\n\t\t\t\tindexv: v === undefined ? indexv : v,\n\t\t\t\torigin\n\t\t\t}\n\t\t});\n\n\t\t// Abort if this slide change was prevented by an event listener\n\t\tif( slidechange.defaultPrevented ) return;\n\n\t\t// Remember where we were at before\n\t\tpreviousSlide = currentSlide;\n\n\t\t// Query all horizontal slides in the deck\n\t\tconst horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );\n\n\t\t// Abort if there are no slides\n\t\tif( horizontalSlides.length === 0 ) return;\n\n\t\t// If no vertical index is specified and the upcoming slide is a\n\t\t// stack, resume at its previous vertical index\n\t\tif( v === undefined && !overview.isActive() ) {\n\t\t\tv = getPreviousVerticalIndex( horizontalSlides[ h ] );\n\t\t}\n\n\t\t// If we were on a vertical stack, remember what vertical index\n\t\t// it was on so we can resume at the same position when returning\n\t\tif( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {\n\t\t\tsetPreviousVerticalIndex( previousSlide.parentNode, indexv );\n\t\t}\n\n\t\t// Remember the state before this slide\n\t\tconst stateBefore = state.concat();\n\n\t\t// Reset the state array\n\t\tstate.length = 0;\n\n\t\tlet indexhBefore = indexh || 0,\n\t\t\tindexvBefore = indexv || 0;\n\n\t\t// Activate and transition to the new slide\n\t\tindexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );\n\t\tindexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );\n\n\t\t// Dispatch an event if the slide changed\n\t\tlet slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );\n\n\t\t// Ensure that the previous slide is never the same as the current\n\t\tif( !slideChanged ) previousSlide = null;\n\n\t\t// Find the current horizontal slide and any possible vertical slides\n\t\t// within it\n\t\tlet currentHorizontalSlide = horizontalSlides[ indexh ],\n\t\t\tcurrentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );\n\n\t\t// Store references to the previous and current slides\n\t\tcurrentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;\n\n\t\tlet autoAnimateTransition = false;\n\n\t\t// Detect if we're moving between two auto-animated slides\n\t\tif( slideChanged && previousSlide && currentSlide && !overview.isActive() ) {\n\n\t\t\t// If this is an auto-animated transition, we disable the\n\t\t\t// regular slide transition\n\t\t\t//\n\t\t\t// Note 20-03-2020:\n\t\t\t// This needs to happen before we update slide visibility,\n\t\t\t// otherwise transitions will still run in Safari.\n\t\t\tif( previousSlide.hasAttribute( 'data-auto-animate' ) && currentSlide.hasAttribute( 'data-auto-animate' )\n\t\t\t\t\t&& previousSlide.getAttribute( 'data-auto-animate-id' ) === currentSlide.getAttribute( 'data-auto-animate-id' )\n\t\t\t\t\t&& !( ( indexh > indexhBefore || indexv > indexvBefore ) ? currentSlide : previousSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {\n\n\t\t\t\tautoAnimateTransition = true;\n\t\t\t\tdom.slides.classList.add( 'disable-slide-transitions' );\n\t\t\t}\n\n\t\t\ttransition = 'running';\n\n\t\t}\n\n\t\t// Update the visibility of slides now that the indices have changed\n\t\tupdateSlidesVisibility();\n\n\t\tlayout();\n\n\t\t// Update the overview if it's currently active\n\t\tif( overview.isActive() ) {\n\t\t\toverview.update();\n\t\t}\n\n\t\t// Show fragment, if specified\n\t\tif( typeof f !== 'undefined' ) {\n\t\t\tfragments.goto( f );\n\t\t}\n\n\t\t// Solves an edge case where the previous slide maintains the\n\t\t// 'present' class when navigating between adjacent vertical\n\t\t// stacks\n\t\tif( previousSlide && previousSlide !== currentSlide ) {\n\t\t\tpreviousSlide.classList.remove( 'present' );\n\t\t\tpreviousSlide.setAttribute( 'aria-hidden', 'true' );\n\n\t\t\t// Reset all slides upon navigate to home\n\t\t\tif( isFirstSlide() ) {\n\t\t\t\t// Launch async task\n\t\t\t\tsetTimeout( () => {\n\t\t\t\t\tgetVerticalStacks().forEach( slide => {\n\t\t\t\t\t\tsetPreviousVerticalIndex( slide, 0 );\n\t\t\t\t\t} );\n\t\t\t\t}, 0 );\n\t\t\t}\n\t\t}\n\n\t\t// Apply the new state\n\t\tstateLoop: for( let i = 0, len = state.length; i < len; i++ ) {\n\t\t\t// Check if this state existed on the previous slide. If it\n\t\t\t// did, we will avoid adding it repeatedly\n\t\t\tfor( let j = 0; j < stateBefore.length; j++ ) {\n\t\t\t\tif( stateBefore[j] === state[i] ) {\n\t\t\t\t\tstateBefore.splice( j, 1 );\n\t\t\t\t\tcontinue stateLoop;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdom.viewport.classList.add( state[i] );\n\n\t\t\t// Dispatch custom event matching the state's name\n\t\t\tdispatchEvent({ type: state[i] });\n\t\t}\n\n\t\t// Clean up the remains of the previous state\n\t\twhile( stateBefore.length ) {\n\t\t\tdom.viewport.classList.remove( stateBefore.pop() );\n\t\t}\n\n\t\tif( slideChanged ) {\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'slidechanged',\n\t\t\t\tdata: {\n\t\t\t\t\tindexh,\n\t\t\t\t\tindexv,\n\t\t\t\t\tpreviousSlide,\n\t\t\t\t\tcurrentSlide,\n\t\t\t\t\torigin\n\t\t\t\t}\n\t\t\t});\n\t\t}\n\n\t\t// Handle embedded content\n\t\tif( slideChanged || !previousSlide ) {\n\t\t\tslideContent.stopEmbeddedContent( previousSlide );\n\t\t\tslideContent.startEmbeddedContent( currentSlide );\n\t\t}\n\n\t\t// Announce the current slide contents to screen readers\n\t\t// Use animation frame to prevent getComputedStyle in getStatusText\n\t\t// from triggering layout mid-frame\n\t\trequestAnimationFrame( () => {\n\t\t\tannounceStatus( getStatusText( currentSlide ) );\n\t\t});\n\n\t\tprogress.update();\n\t\tcontrols.update();\n\t\tnotes.update();\n\t\tbackgrounds.update();\n\t\tbackgrounds.updateParallax();\n\t\tslideNumber.update();\n\t\tfragments.update();\n\n\t\t// Update the URL hash\n\t\tlocation.writeURL();\n\n\t\tcueAutoSlide();\n\n\t\t// Auto-animation\n\t\tif( autoAnimateTransition ) {\n\n\t\t\tsetTimeout( () => {\n\t\t\t\tdom.slides.classList.remove( 'disable-slide-transitions' );\n\t\t\t}, 0 );\n\n\t\t\tif( config.autoAnimate ) {\n\t\t\t\t// Run the auto-animation between our slides\n\t\t\t\tautoAnimate.run( previousSlide, currentSlide );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Syncs the presentation with the current DOM. Useful\n\t * when new slides or control elements are added or when\n\t * the configuration has changed.\n\t */\n\tfunction sync() {\n\n\t\t// Subscribe to input\n\t\tremoveEventListeners();\n\t\taddEventListeners();\n\n\t\t// Force a layout to make sure the current config is accounted for\n\t\tlayout();\n\n\t\t// Reflect the current autoSlide value\n\t\tautoSlide = config.autoSlide;\n\n\t\t// Start auto-sliding if it's enabled\n\t\tcueAutoSlide();\n\n\t\t// Re-create all slide backgrounds\n\t\tbackgrounds.create();\n\n\t\t// Write the current hash to the URL\n\t\tlocation.writeURL();\n\n\t\tfragments.sortAll();\n\n\t\tcontrols.update();\n\t\tprogress.update();\n\n\t\tupdateSlidesVisibility();\n\n\t\tnotes.update();\n\t\tnotes.updateVisibility();\n\t\tbackgrounds.update( true );\n\t\tslideNumber.update();\n\t\tslideContent.formatEmbeddedContent();\n\n\t\t// Start or stop embedded content depending on global config\n\t\tif( config.autoPlayMedia === false ) {\n\t\t\tslideContent.stopEmbeddedContent( currentSlide, { unloadIframes: false } );\n\t\t}\n\t\telse {\n\t\t\tslideContent.startEmbeddedContent( currentSlide );\n\t\t}\n\n\t\tif( overview.isActive() ) {\n\t\t\toverview.layout();\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates reveal.js to keep in sync with new slide attributes. For\n\t * example, if you add a new `data-background-image` you can call\n\t * this to have reveal.js render the new background image.\n\t *\n\t * Similar to #sync() but more efficient when you only need to\n\t * refresh a specific slide.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tfunction syncSlide( slide = currentSlide ) {\n\n\t\tbackgrounds.sync( slide );\n\t\tfragments.sync( slide );\n\n\t\tslideContent.load( slide );\n\n\t\tbackgrounds.update();\n\t\tnotes.update();\n\n\t}\n\n\t/**\n\t * Resets all vertical slides so that only the first\n\t * is visible.\n\t */\n\tfunction resetVerticalSlides() {\n\n\t\tgetHorizontalSlides().forEach( horizontalSlide => {\n\n\t\t\tUtil.queryAll( horizontalSlide, 'section' ).forEach( ( verticalSlide, y ) => {\n\n\t\t\t\tif( y > 0 ) {\n\t\t\t\t\tverticalSlide.classList.remove( 'present' );\n\t\t\t\t\tverticalSlide.classList.remove( 'past' );\n\t\t\t\t\tverticalSlide.classList.add( 'future' );\n\t\t\t\t\tverticalSlide.setAttribute( 'aria-hidden', 'true' );\n\t\t\t\t}\n\n\t\t\t} );\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Randomly shuffles all slides in the deck.\n\t */\n\tfunction shuffle( slides = getHorizontalSlides() ) {\n\n\t\tslides.forEach( ( slide, i ) => {\n\n\t\t\t// Insert the slide next to a randomly picked sibling slide\n\t\t\t// slide. This may cause the slide to insert before itself,\n\t\t\t// but that's not an issue.\n\t\t\tlet beforeSlide = slides[ Math.floor( Math.random() * slides.length ) ];\n\t\t\tif( beforeSlide.parentNode === slide.parentNode ) {\n\t\t\t\tslide.parentNode.insertBefore( slide, beforeSlide );\n\t\t\t}\n\n\t\t\t// Randomize the order of vertical slides (if there are any)\n\t\t\tlet verticalSlides = slide.querySelectorAll( 'section' );\n\t\t\tif( verticalSlides.length ) {\n\t\t\t\tshuffle( verticalSlides );\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Updates one dimension of slides by showing the slide\n\t * with the specified index.\n\t *\n\t * @param {string} selector A CSS selector that will fetch\n\t * the group of slides we are working with\n\t * @param {number} index The index of the slide that should be\n\t * shown\n\t *\n\t * @return {number} The index of the slide that is now shown,\n\t * might differ from the passed in index if it was out of\n\t * bounds.\n\t */\n\tfunction updateSlides( selector, index ) {\n\n\t\t// Select all slides and convert the NodeList result to\n\t\t// an array\n\t\tlet slides = Util.queryAll( dom.wrapper, selector ),\n\t\t\tslidesLength = slides.length;\n\n\t\tlet printMode = print.isPrintingPDF();\n\t\tlet loopedForwards = false;\n\t\tlet loopedBackwards = false;\n\n\t\tif( slidesLength ) {\n\n\t\t\t// Should the index loop?\n\t\t\tif( config.loop ) {\n\t\t\t\tif( index >= slidesLength ) loopedForwards = true;\n\n\t\t\t\tindex %= slidesLength;\n\n\t\t\t\tif( index < 0 ) {\n\t\t\t\t\tindex = slidesLength + index;\n\t\t\t\t\tloopedBackwards = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Enforce max and minimum index bounds\n\t\t\tindex = Math.max( Math.min( index, slidesLength - 1 ), 0 );\n\n\t\t\tfor( let i = 0; i < slidesLength; i++ ) {\n\t\t\t\tlet element = slides[i];\n\n\t\t\t\tlet reverse = config.rtl && !isVerticalSlide( element );\n\n\t\t\t\t// Avoid .remove() with multiple args for IE11 support\n\t\t\t\telement.classList.remove( 'past' );\n\t\t\t\telement.classList.remove( 'present' );\n\t\t\t\telement.classList.remove( 'future' );\n\n\t\t\t\t// http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute\n\t\t\t\telement.setAttribute( 'hidden', '' );\n\t\t\t\telement.setAttribute( 'aria-hidden', 'true' );\n\n\t\t\t\t// If this element contains vertical slides\n\t\t\t\tif( element.querySelector( 'section' ) ) {\n\t\t\t\t\telement.classList.add( 'stack' );\n\t\t\t\t}\n\n\t\t\t\t// If we're printing static slides, all slides are \"present\"\n\t\t\t\tif( printMode ) {\n\t\t\t\t\telement.classList.add( 'present' );\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif( i < index ) {\n\t\t\t\t\t// Any element previous to index is given the 'past' class\n\t\t\t\t\telement.classList.add( reverse ? 'future' : 'past' );\n\n\t\t\t\t\tif( config.fragments ) {\n\t\t\t\t\t\t// Show all fragments in prior slides\n\t\t\t\t\t\tshowFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( i > index ) {\n\t\t\t\t\t// Any element subsequent to index is given the 'future' class\n\t\t\t\t\telement.classList.add( reverse ? 'past' : 'future' );\n\n\t\t\t\t\tif( config.fragments ) {\n\t\t\t\t\t\t// Hide all fragments in future slides\n\t\t\t\t\t\thideFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Update the visibility of fragments when a presentation loops\n\t\t\t\t// in either direction\n\t\t\t\telse if( i === index && config.fragments ) {\n\t\t\t\t\tif( loopedForwards ) {\n\t\t\t\t\t\thideFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t\telse if( loopedBackwards ) {\n\t\t\t\t\t\tshowFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tlet slide = slides[index];\n\t\t\tlet wasPresent = slide.classList.contains( 'present' );\n\n\t\t\t// Mark the current slide as present\n\t\t\tslide.classList.add( 'present' );\n\t\t\tslide.removeAttribute( 'hidden' );\n\t\t\tslide.removeAttribute( 'aria-hidden' );\n\n\t\t\tif( !wasPresent ) {\n\t\t\t\t// Dispatch an event indicating the slide is now visible\n\t\t\t\tdispatchEvent({\n\t\t\t\t\ttarget: slide,\n\t\t\t\t\ttype: 'visible',\n\t\t\t\t\tbubbles: false\n\t\t\t\t});\n\t\t\t}\n\n\t\t\t// If this slide has a state associated with it, add it\n\t\t\t// onto the current state of the deck\n\t\t\tlet slideState = slide.getAttribute( 'data-state' );\n\t\t\tif( slideState ) {\n\t\t\t\tstate = state.concat( slideState.split( ' ' ) );\n\t\t\t}\n\n\t\t}\n\t\telse {\n\t\t\t// Since there are no slides we can't be anywhere beyond the\n\t\t\t// zeroth index\n\t\t\tindex = 0;\n\t\t}\n\n\t\treturn index;\n\n\t}\n\n\t/**\n\t * Shows all fragment elements within the given contaienr.\n\t */\n\tfunction showFragmentsIn( container ) {\n\n\t\tUtil.queryAll( container, '.fragment' ).forEach( fragment => {\n\t\t\tfragment.classList.add( 'visible' );\n\t\t\tfragment.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Hides all fragment elements within the given contaienr.\n\t */\n\tfunction hideFragmentsIn( container ) {\n\n\t\tUtil.queryAll( container, '.fragment.visible' ).forEach( fragment => {\n\t\t\tfragment.classList.remove( 'visible', 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Optimization method; hide all slides that are far away\n\t * from the present slide.\n\t */\n\tfunction updateSlidesVisibility() {\n\n\t\t// Select all slides and convert the NodeList result to\n\t\t// an array\n\t\tlet horizontalSlides = getHorizontalSlides(),\n\t\t\thorizontalSlidesLength = horizontalSlides.length,\n\t\t\tdistanceX,\n\t\t\tdistanceY;\n\n\t\tif( horizontalSlidesLength && typeof indexh !== 'undefined' ) {\n\n\t\t\t// The number of steps away from the present slide that will\n\t\t\t// be visible\n\t\t\tlet viewDistance = overview.isActive() ? 10 : config.viewDistance;\n\n\t\t\t// Shorten the view distance on devices that typically have\n\t\t\t// less resources\n\t\t\tif( Device.isMobile ) {\n\t\t\t\tviewDistance = overview.isActive() ? 6 : config.mobileViewDistance;\n\t\t\t}\n\n\t\t\t// All slides need to be visible when exporting to PDF\n\t\t\tif( print.isPrintingPDF() ) {\n\t\t\t\tviewDistance = Number.MAX_VALUE;\n\t\t\t}\n\n\t\t\tfor( let x = 0; x < horizontalSlidesLength; x++ ) {\n\t\t\t\tlet horizontalSlide = horizontalSlides[x];\n\n\t\t\t\tlet verticalSlides = Util.queryAll( horizontalSlide, 'section' ),\n\t\t\t\t\tverticalSlidesLength = verticalSlides.length;\n\n\t\t\t\t// Determine how far away this slide is from the present\n\t\t\t\tdistanceX = Math.abs( ( indexh || 0 ) - x ) || 0;\n\n\t\t\t\t// If the presentation is looped, distance should measure\n\t\t\t\t// 1 between the first and last slides\n\t\t\t\tif( config.loop ) {\n\t\t\t\t\tdistanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;\n\t\t\t\t}\n\n\t\t\t\t// Show the horizontal slide if it's within the view distance\n\t\t\t\tif( distanceX < viewDistance ) {\n\t\t\t\t\tslideContent.load( horizontalSlide );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tslideContent.unload( horizontalSlide );\n\t\t\t\t}\n\n\t\t\t\tif( verticalSlidesLength ) {\n\n\t\t\t\t\tlet oy = getPreviousVerticalIndex( horizontalSlide );\n\n\t\t\t\t\tfor( let y = 0; y < verticalSlidesLength; y++ ) {\n\t\t\t\t\t\tlet verticalSlide = verticalSlides[y];\n\n\t\t\t\t\t\tdistanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );\n\n\t\t\t\t\t\tif( distanceX + distanceY < viewDistance ) {\n\t\t\t\t\t\t\tslideContent.load( verticalSlide );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tslideContent.unload( verticalSlide );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Flag if there are ANY vertical slides, anywhere in the deck\n\t\t\tif( hasVerticalSlides() ) {\n\t\t\t\tdom.wrapper.classList.add( 'has-vertical-slides' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tdom.wrapper.classList.remove( 'has-vertical-slides' );\n\t\t\t}\n\n\t\t\t// Flag if there are ANY horizontal slides, anywhere in the deck\n\t\t\tif( hasHorizontalSlides() ) {\n\t\t\t\tdom.wrapper.classList.add( 'has-horizontal-slides' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tdom.wrapper.classList.remove( 'has-horizontal-slides' );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Determine what available routes there are for navigation.\n\t *\n\t * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}\n\t */\n\tfunction availableRoutes({ includeFragments = false } = {}) {\n\n\t\tlet horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),\n\t\t\tverticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );\n\n\t\tlet routes = {\n\t\t\tleft: indexh > 0,\n\t\t\tright: indexh < horizontalSlides.length - 1,\n\t\t\tup: indexv > 0,\n\t\t\tdown: indexv < verticalSlides.length - 1\n\t\t};\n\n\t\t// Looped presentations can always be navigated as long as\n\t\t// there are slides available\n\t\tif( config.loop ) {\n\t\t\tif( horizontalSlides.length > 1 ) {\n\t\t\t\troutes.left = true;\n\t\t\t\troutes.right = true;\n\t\t\t}\n\n\t\t\tif( verticalSlides.length > 1 ) {\n\t\t\t\troutes.up = true;\n\t\t\t\troutes.down = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( horizontalSlides.length > 1 && config.navigationMode === 'linear' ) {\n\t\t\troutes.right = routes.right || routes.down;\n\t\t\troutes.left = routes.left || routes.up;\n\t\t}\n\n\t\t// If includeFragments is set, a route will be considered\n\t\t// availalbe if either a slid OR fragment is available in\n\t\t// the given direction\n\t\tif( includeFragments === true ) {\n\t\t\tlet fragmentRoutes = fragments.availableRoutes();\n\t\t\troutes.left = routes.left || fragmentRoutes.prev;\n\t\t\troutes.up = routes.up || fragmentRoutes.prev;\n\t\t\troutes.down = routes.down || fragmentRoutes.next;\n\t\t\troutes.right = routes.right || fragmentRoutes.next;\n\t\t}\n\n\t\t// Reverse horizontal controls for rtl\n\t\tif( config.rtl ) {\n\t\t\tlet left = routes.left;\n\t\t\troutes.left = routes.right;\n\t\t\troutes.right = left;\n\t\t}\n\n\t\treturn routes;\n\n\t}\n\n\t/**\n\t * Returns the number of past slides. This can be used as a global\n\t * flattened index for slides.\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide we're counting before\n\t *\n\t * @return {number} Past slide count\n\t */\n\tfunction getSlidePastCount( slide = currentSlide ) {\n\n\t\tlet horizontalSlides = getHorizontalSlides();\n\n\t\t// The number of past slides\n\t\tlet pastCount = 0;\n\n\t\t// Step through all slides and count the past ones\n\t\tmainLoop: for( let i = 0; i < horizontalSlides.length; i++ ) {\n\n\t\t\tlet horizontalSlide = horizontalSlides[i];\n\t\t\tlet verticalSlides = horizontalSlide.querySelectorAll( 'section' );\n\n\t\t\tfor( let j = 0; j < verticalSlides.length; j++ ) {\n\n\t\t\t\t// Stop as soon as we arrive at the present\n\t\t\t\tif( verticalSlides[j] === slide ) {\n\t\t\t\t\tbreak mainLoop;\n\t\t\t\t}\n\n\t\t\t\t// Don't count slides with the \"uncounted\" class\n\t\t\t\tif( verticalSlides[j].dataset.visibility !== 'uncounted' ) {\n\t\t\t\t\tpastCount++;\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\t// Stop as soon as we arrive at the present\n\t\t\tif( horizontalSlide === slide ) {\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\t// Don't count the wrapping section for vertical slides and\n\t\t\t// slides marked as uncounted\n\t\t\tif( horizontalSlide.classList.contains( 'stack' ) === false && horizontalSlide.dataset.visibility !== 'uncounted' ) {\n\t\t\t\tpastCount++;\n\t\t\t}\n\n\t\t}\n\n\t\treturn pastCount;\n\n\t}\n\n\t/**\n\t * Returns a value ranging from 0-1 that represents\n\t * how far into the presentation we have navigated.\n\t *\n\t * @return {number}\n\t */\n\tfunction getProgress() {\n\n\t\t// The number of past and total slides\n\t\tlet totalCount = getTotalSlides();\n\t\tlet pastCount = getSlidePastCount();\n\n\t\tif( currentSlide ) {\n\n\t\t\tlet allFragments = currentSlide.querySelectorAll( '.fragment' );\n\n\t\t\t// If there are fragments in the current slide those should be\n\t\t\t// accounted for in the progress.\n\t\t\tif( allFragments.length > 0 ) {\n\t\t\t\tlet visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );\n\n\t\t\t\t// This value represents how big a portion of the slide progress\n\t\t\t\t// that is made up by its fragments (0-1)\n\t\t\t\tlet fragmentWeight = 0.9;\n\n\t\t\t\t// Add fragment progress to the past slide count\n\t\t\t\tpastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;\n\t\t\t}\n\n\t\t}\n\n\t\treturn Math.min( pastCount / ( totalCount - 1 ), 1 );\n\n\t}\n\n\t/**\n\t * Retrieves the h/v location and fragment of the current,\n\t * or specified, slide.\n\t *\n\t * @param {HTMLElement} [slide] If specified, the returned\n\t * index will be for this slide rather than the currently\n\t * active one\n\t *\n\t * @return {{h: number, v: number, f: number}}\n\t */\n\tfunction getIndices( slide ) {\n\n\t\t// By default, return the current indices\n\t\tlet h = indexh,\n\t\t\tv = indexv,\n\t\t\tf;\n\n\t\t// If a slide is specified, return the indices of that slide\n\t\tif( slide ) {\n\t\t\tlet isVertical = isVerticalSlide( slide );\n\t\t\tlet slideh = isVertical ? slide.parentNode : slide;\n\n\t\t\t// Select all horizontal slides\n\t\t\tlet horizontalSlides = getHorizontalSlides();\n\n\t\t\t// Now that we know which the horizontal slide is, get its index\n\t\t\th = Math.max( horizontalSlides.indexOf( slideh ), 0 );\n\n\t\t\t// Assume we're not vertical\n\t\t\tv = undefined;\n\n\t\t\t// If this is a vertical slide, grab the vertical index\n\t\t\tif( isVertical ) {\n\t\t\t\tv = Math.max( Util.queryAll( slide.parentNode, 'section' ).indexOf( slide ), 0 );\n\t\t\t}\n\t\t}\n\n\t\tif( !slide && currentSlide ) {\n\t\t\tlet hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;\n\t\t\tif( hasFragments ) {\n\t\t\t\tlet currentFragment = currentSlide.querySelector( '.current-fragment' );\n\t\t\t\tif( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\t\tf = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tf = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn { h, v, f };\n\n\t}\n\n\t/**\n\t * Retrieves all slides in this presentation.\n\t */\n\tfunction getSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, SLIDES_SELECTOR + ':not(.stack):not([data-visibility=\"uncounted\"])' );\n\n\t}\n\n\t/**\n\t * Returns a list of all horizontal slides in the deck. Each\n\t * vertical stack is included as one horizontal slide in the\n\t * resulting array.\n\t */\n\tfunction getHorizontalSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR );\n\n\t}\n\n\t/**\n\t * Returns all vertical slides that exist within this deck.\n\t */\n\tfunction getVerticalSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, '.slides>section>section' );\n\n\t}\n\n\t/**\n\t * Returns all vertical stacks (each stack can contain multiple slides).\n\t */\n\tfunction getVerticalStacks() {\n\n\t\treturn Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.stack');\n\n\t}\n\n\t/**\n\t * Returns true if there are at least two horizontal slides.\n\t */\n\tfunction hasHorizontalSlides() {\n\n\t\treturn getHorizontalSlides().length > 1;\n\t}\n\n\t/**\n\t * Returns true if there are at least two vertical slides.\n\t */\n\tfunction hasVerticalSlides() {\n\n\t\treturn getVerticalSlides().length > 1;\n\n\t}\n\n\t/**\n\t * Returns an array of objects where each object represents the\n\t * attributes on its respective slide.\n\t */\n\tfunction getSlidesAttributes() {\n\n\t\treturn getSlides().map( slide => {\n\n\t\t\tlet attributes = {};\n\t\t\tfor( let i = 0; i < slide.attributes.length; i++ ) {\n\t\t\t\tlet attribute = slide.attributes[ i ];\n\t\t\t\tattributes[ attribute.name ] = attribute.value;\n\t\t\t}\n\t\t\treturn attributes;\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Retrieves the total number of slides in this presentation.\n\t *\n\t * @return {number}\n\t */\n\tfunction getTotalSlides() {\n\n\t\treturn getSlides().length;\n\n\t}\n\n\t/**\n\t * Returns the slide element matching the specified index.\n\t *\n\t * @return {HTMLElement}\n\t */\n\tfunction getSlide( x, y ) {\n\n\t\tlet horizontalSlide = getHorizontalSlides()[ x ];\n\t\tlet verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );\n\n\t\tif( verticalSlides && verticalSlides.length && typeof y === 'number' ) {\n\t\t\treturn verticalSlides ? verticalSlides[ y ] : undefined;\n\t\t}\n\n\t\treturn horizontalSlide;\n\n\t}\n\n\t/**\n\t * Returns the background element for the given slide.\n\t * All slides, even the ones with no background properties\n\t * defined, have a background element so as long as the\n\t * index is valid an element will be returned.\n\t *\n\t * @param {mixed} x Horizontal background index OR a slide\n\t * HTML element\n\t * @param {number} y Vertical background index\n\t * @return {(HTMLElement[]|*)}\n\t */\n\tfunction getSlideBackground( x, y ) {\n\n\t\tlet slide = typeof x === 'number' ? getSlide( x, y ) : x;\n\t\tif( slide ) {\n\t\t\treturn slide.slideBackgroundElement;\n\t\t}\n\n\t\treturn undefined;\n\n\t}\n\n\t/**\n\t * Retrieves the current state of the presentation as\n\t * an object. This state can then be restored at any\n\t * time.\n\t *\n\t * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}\n\t */\n\tfunction getState() {\n\n\t\tlet indices = getIndices();\n\n\t\treturn {\n\t\t\tindexh: indices.h,\n\t\t\tindexv: indices.v,\n\t\t\tindexf: indices.f,\n\t\t\tpaused: isPaused(),\n\t\t\toverview: overview.isActive()\n\t\t};\n\n\t}\n\n\t/**\n\t * Restores the presentation to the given state.\n\t *\n\t * @param {object} state As generated by getState()\n\t * @see {@link getState} generates the parameter `state`\n\t */\n\tfunction setState( state ) {\n\n\t\tif( typeof state === 'object' ) {\n\t\t\tslide( Util.deserialize( state.indexh ), Util.deserialize( state.indexv ), Util.deserialize( state.indexf ) );\n\n\t\t\tlet pausedFlag = Util.deserialize( state.paused ),\n\t\t\t\toverviewFlag = Util.deserialize( state.overview );\n\n\t\t\tif( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {\n\t\t\t\ttogglePause( pausedFlag );\n\t\t\t}\n\n\t\t\tif( typeof overviewFlag === 'boolean' && overviewFlag !== overview.isActive() ) {\n\t\t\t\toverview.toggle( overviewFlag );\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Cues a new automated slide if enabled in the config.\n\t */\n\tfunction cueAutoSlide() {\n\n\t\tcancelAutoSlide();\n\n\t\tif( currentSlide && config.autoSlide !== false ) {\n\n\t\t\tlet fragment = currentSlide.querySelector( '.current-fragment' );\n\n\t\t\t// When the slide first appears there is no \"current\" fragment so\n\t\t\t// we look for a data-autoslide timing on the first fragment\n\t\t\tif( !fragment ) fragment = currentSlide.querySelector( '.fragment' );\n\n\t\t\tlet fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;\n\t\t\tlet parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;\n\t\t\tlet slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );\n\n\t\t\t// Pick value in the following priority order:\n\t\t\t// 1. Current fragment's data-autoslide\n\t\t\t// 2. Current slide's data-autoslide\n\t\t\t// 3. Parent slide's data-autoslide\n\t\t\t// 4. Global autoSlide setting\n\t\t\tif( fragmentAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( fragmentAutoSlide, 10 );\n\t\t\t}\n\t\t\telse if( slideAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( slideAutoSlide, 10 );\n\t\t\t}\n\t\t\telse if( parentAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( parentAutoSlide, 10 );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tautoSlide = config.autoSlide;\n\n\t\t\t\t// If there are media elements with data-autoplay,\n\t\t\t\t// automatically set the autoSlide duration to the\n\t\t\t\t// length of that media. Not applicable if the slide\n\t\t\t\t// is divided up into fragments.\n\t\t\t\t// playbackRate is accounted for in the duration.\n\t\t\t\tif( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {\n\t\t\t\t\tUtil.queryAll( currentSlide, 'video, audio' ).forEach( el => {\n\t\t\t\t\t\tif( el.hasAttribute( 'data-autoplay' ) ) {\n\t\t\t\t\t\t\tif( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {\n\t\t\t\t\t\t\t\tautoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Cue the next auto-slide if:\n\t\t\t// - There is an autoSlide value\n\t\t\t// - Auto-sliding isn't paused by the user\n\t\t\t// - The presentation isn't paused\n\t\t\t// - The overview isn't active\n\t\t\t// - The presentation isn't over\n\t\t\tif( autoSlide && !autoSlidePaused && !isPaused() && !overview.isActive() && ( !isLastSlide() || fragments.availableRoutes().next || config.loop === true ) ) {\n\t\t\t\tautoSlideTimeout = setTimeout( () => {\n\t\t\t\t\tif( typeof config.autoSlideMethod === 'function' ) {\n\t\t\t\t\t\tconfig.autoSlideMethod()\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tnavigateNext();\n\t\t\t\t\t}\n\t\t\t\t\tcueAutoSlide();\n\t\t\t\t}, autoSlide );\n\t\t\t\tautoSlideStartTime = Date.now();\n\t\t\t}\n\n\t\t\tif( autoSlidePlayer ) {\n\t\t\t\tautoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Cancels any ongoing request to auto-slide.\n\t */\n\tfunction cancelAutoSlide() {\n\n\t\tclearTimeout( autoSlideTimeout );\n\t\tautoSlideTimeout = -1;\n\n\t}\n\n\tfunction pauseAutoSlide() {\n\n\t\tif( autoSlide && !autoSlidePaused ) {\n\t\t\tautoSlidePaused = true;\n\t\t\tdispatchEvent({ type: 'autoslidepaused' });\n\t\t\tclearTimeout( autoSlideTimeout );\n\n\t\t\tif( autoSlidePlayer ) {\n\t\t\t\tautoSlidePlayer.setPlaying( false );\n\t\t\t}\n\t\t}\n\n\t}\n\n\tfunction resumeAutoSlide() {\n\n\t\tif( autoSlide && autoSlidePaused ) {\n\t\t\tautoSlidePaused = false;\n\t\t\tdispatchEvent({ type: 'autoslideresumed' });\n\t\t\tcueAutoSlide();\n\t\t}\n\n\t}\n\n\tfunction navigateLeft({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\n\t\t// Reverse for RTL\n\t\tif( config.rtl ) {\n\t\t\tif( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().left ) {\n\t\t\t\tslide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t\t}\n\t\t}\n\t\t// Normal navigation\n\t\telse if( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().left ) {\n\t\t\tslide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t}\n\n\t}\n\n\tfunction navigateRight({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\n\t\t// Reverse for RTL\n\t\tif( config.rtl ) {\n\t\t\tif( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().right ) {\n\t\t\t\tslide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t\t}\n\t\t}\n\t\t// Normal navigation\n\t\telse if( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().right ) {\n\t\t\tslide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t}\n\n\t}\n\n\tfunction navigateUp({skipFragments=false}={}) {\n\n\t\t// Prioritize hiding fragments\n\t\tif( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().up ) {\n\t\t\tslide( indexh, indexv - 1 );\n\t\t}\n\n\t}\n\n\tfunction navigateDown({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedVertically = true;\n\n\t\t// Prioritize revealing fragments\n\t\tif( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().down ) {\n\t\t\tslide( indexh, indexv + 1 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Navigates backwards, prioritized in the following order:\n\t * 1) Previous fragment\n\t * 2) Previous vertical slide\n\t * 3) Previous horizontal slide\n\t */\n\tfunction navigatePrev({skipFragments=false}={}) {\n\n\t\t// Prioritize revealing fragments\n\t\tif( skipFragments || fragments.prev() === false ) {\n\t\t\tif( availableRoutes().up ) {\n\t\t\t\tnavigateUp({skipFragments});\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// Fetch the previous horizontal slide, if there is one\n\t\t\t\tlet previousSlide;\n\n\t\t\t\tif( config.rtl ) {\n\t\t\t\t\tpreviousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.future' ).pop();\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tpreviousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.past' ).pop();\n\t\t\t\t}\n\n\t\t\t\t// When going backwards and arriving on a stack we start\n\t\t\t\t// at the bottom of the stack\n\t\t\t\tif( previousSlide && previousSlide.classList.contains( 'stack' ) ) {\n\t\t\t\t\tlet v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;\n\t\t\t\t\tlet h = indexh - 1;\n\t\t\t\t\tslide( h, v );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tnavigateLeft({skipFragments});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * The reverse of #navigatePrev().\n\t */\n\tfunction navigateNext({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\t\tnavigationHistory.hasNavigatedVertically = true;\n\n\t\t// Prioritize revealing fragments\n\t\tif( skipFragments || fragments.next() === false ) {\n\n\t\t\tlet routes = availableRoutes();\n\n\t\t\t// When looping is enabled `routes.down` is always available\n\t\t\t// so we need a separate check for when we've reached the\n\t\t\t// end of a stack and should move horizontally\n\t\t\tif( routes.down && routes.right && config.loop && isLastVerticalSlide() ) {\n\t\t\t\troutes.down = false;\n\t\t\t}\n\n\t\t\tif( routes.down ) {\n\t\t\t\tnavigateDown({skipFragments});\n\t\t\t}\n\t\t\telse if( config.rtl ) {\n\t\t\t\tnavigateLeft({skipFragments});\n\t\t\t}\n\t\t\telse {\n\t\t\t\tnavigateRight({skipFragments});\n\t\t\t}\n\t\t}\n\n\t}\n\n\n\t// --------------------------------------------------------------------//\n\t// ----------------------------- EVENTS -------------------------------//\n\t// --------------------------------------------------------------------//\n\n\t/**\n\t * Called by all event handlers that are based on user\n\t * input.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onUserInput( event ) {\n\n\t\tif( config.autoSlideStoppable ) {\n\t\t\tpauseAutoSlide();\n\t\t}\n\n\t}\n\n\t/**\n\t* Listener for post message events posted to this window.\n\t*/\n\tfunction onPostMessage( event ) {\n\n\t\tlet data = event.data;\n\n\t\t// Make sure we're dealing with JSON\n\t\tif( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {\n\t\t\tdata = JSON.parse( data );\n\n\t\t\t// Check if the requested method can be found\n\t\t\tif( data.method && typeof Reveal[data.method] === 'function' ) {\n\n\t\t\t\tif( POST_MESSAGE_METHOD_BLACKLIST.test( data.method ) === false ) {\n\n\t\t\t\t\tconst result = Reveal[data.method].apply( Reveal, data.args );\n\n\t\t\t\t\t// Dispatch a postMessage event with the returned value from\n\t\t\t\t\t// our method invocation for getter functions\n\t\t\t\t\tdispatchPostMessage( 'callback', { method: data.method, result: result } );\n\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tconsole.warn( 'reveal.js: \"'+ data.method +'\" is is blacklisted from the postMessage API' );\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Event listener for transition end on the current slide.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onTransitionEnd( event ) {\n\n\t\tif( transition === 'running' && /section/gi.test( event.target.nodeName ) ) {\n\t\t\ttransition = 'idle';\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'slidetransitionend',\n\t\t\t\tdata: { indexh, indexv, previousSlide, currentSlide }\n\t\t\t});\n\t\t}\n\n\t}\n\n\t/**\n\t * A global listener for all click events inside of the\n\t * .slides container.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onSlidesClicked( event ) {\n\n\t\tconst anchor = Util.closest( event.target, 'a[href^=\"#\"]' );\n\n\t\t// If a hash link is clicked, we find the target slide\n\t\t// and navigate to it. We previously relied on 'hashchange'\n\t\t// for links like these but that prevented media with\n\t\t// audio tracks from playing in mobile browsers since it\n\t\t// wasn't considered a direct interaction with the document.\n\t\tif( anchor ) {\n\t\t\tconst hash = anchor.getAttribute( 'href' );\n\t\t\tconst indices = location.getIndicesFromHash( hash );\n\n\t\t\tif( indices ) {\n\t\t\t\tReveal.slide( indices.h, indices.v, indices.f );\n\t\t\t\tevent.preventDefault();\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the window level 'resize' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onWindowResize( event ) {\n\n\t\tlayout();\n\n\t}\n\n\t/**\n\t * Handle for the window level 'visibilitychange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onPageVisibilityChange( event ) {\n\n\t\t// If, after clicking a link or similar and we're coming back,\n\t\t// focus the document.body to ensure we can use keyboard shortcuts\n\t\tif( document.hidden === false && document.activeElement !== document.body ) {\n\t\t\t// Not all elements support .blur() - SVGs among them.\n\t\t\tif( typeof document.activeElement.blur === 'function' ) {\n\t\t\t\tdocument.activeElement.blur();\n\t\t\t}\n\t\t\tdocument.body.focus();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the document level 'fullscreenchange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onFullscreenChange( event ) {\n\n\t\tlet element = document.fullscreenElement || document.webkitFullscreenElement;\n\t\tif( element === dom.wrapper ) {\n\t\t\tevent.stopImmediatePropagation();\n\n\t\t\t// Timeout to avoid layout shift in Safari\n\t\t\tsetTimeout( () => {\n\t\t\t\tReveal.layout();\n\t\t\t\tReveal.focus.focus(); // focus.focus :'(\n\t\t\t}, 1 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Handles clicks on links that are set to preview in the\n\t * iframe overlay.\n\t *\n\t * @param {object} event\n\t */\n\tfunction onPreviewLinkClicked( event ) {\n\n\t\tif( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {\n\t\t\tlet url = event.currentTarget.getAttribute( 'href' );\n\t\t\tif( url ) {\n\t\t\t\tshowPreview( url );\n\t\t\t\tevent.preventDefault();\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Handles click on the auto-sliding controls element.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onAutoSlidePlayerClick( event ) {\n\n\t\t// Replay\n\t\tif( isLastSlide() && config.loop === false ) {\n\t\t\tslide( 0, 0 );\n\t\t\tresumeAutoSlide();\n\t\t}\n\t\t// Resume\n\t\telse if( autoSlidePaused ) {\n\t\t\tresumeAutoSlide();\n\t\t}\n\t\t// Pause\n\t\telse {\n\t\t\tpauseAutoSlide();\n\t\t}\n\n\t}\n\n\n\t// --------------------------------------------------------------------//\n\t// ------------------------------- API --------------------------------//\n\t// --------------------------------------------------------------------//\n\n\t// The public reveal.js API\n\tconst API = {\n\t\tVERSION,\n\n\t\tinitialize,\n\t\tconfigure,\n\t\tdestroy,\n\n\t\tsync,\n\t\tsyncSlide,\n\t\tsyncFragments: fragments.sync.bind( fragments ),\n\n\t\t// Navigation methods\n\t\tslide,\n\t\tleft: navigateLeft,\n\t\tright: navigateRight,\n\t\tup: navigateUp,\n\t\tdown: navigateDown,\n\t\tprev: navigatePrev,\n\t\tnext: navigateNext,\n\n\t\t// Navigation aliases\n\t\tnavigateLeft, navigateRight, navigateUp, navigateDown, navigatePrev, navigateNext,\n\n\t\t// Fragment methods\n\t\tnavigateFragment: fragments.goto.bind( fragments ),\n\t\tprevFragment: fragments.prev.bind( fragments ),\n\t\tnextFragment: fragments.next.bind( fragments ),\n\n\t\t// Event binding\n\t\ton,\n\t\toff,\n\n\t\t// Legacy event binding methods left in for backwards compatibility\n\t\taddEventListener: on,\n\t\tremoveEventListener: off,\n\n\t\t// Forces an update in slide layout\n\t\tlayout,\n\n\t\t// Randomizes the order of slides\n\t\tshuffle,\n\n\t\t// Returns an object with the available routes as booleans (left/right/top/bottom)\n\t\tavailableRoutes,\n\n\t\t// Returns an object with the available fragments as booleans (prev/next)\n\t\tavailableFragments: fragments.availableRoutes.bind( fragments ),\n\n\t\t// Toggles a help overlay with keyboard shortcuts\n\t\ttoggleHelp,\n\n\t\t// Toggles the overview mode on/off\n\t\ttoggleOverview: overview.toggle.bind( overview ),\n\n\t\t// Toggles the \"black screen\" mode on/off\n\t\ttogglePause,\n\n\t\t// Toggles the auto slide mode on/off\n\t\ttoggleAutoSlide,\n\n\t\t// Slide navigation checks\n\t\tisFirstSlide,\n\t\tisLastSlide,\n\t\tisLastVerticalSlide,\n\t\tisVerticalSlide,\n\n\t\t// State checks\n\t\tisPaused,\n\t\tisAutoSliding,\n\t\tisSpeakerNotes: notes.isSpeakerNotesWindow.bind( notes ),\n\t\tisOverview: overview.isActive.bind( overview ),\n\t\tisFocused: focus.isFocused.bind( focus ),\n\t\tisPrintingPDF: print.isPrintingPDF.bind( print ),\n\n\t\t// Checks if reveal.js has been loaded and is ready for use\n\t\tisReady: () => ready,\n\n\t\t// Slide preloading\n\t\tloadSlide: slideContent.load.bind( slideContent ),\n\t\tunloadSlide: slideContent.unload.bind( slideContent ),\n\n\t\t// Preview management\n\t\tshowPreview,\n\t\thidePreview: closeOverlay,\n\n\t\t// Adds or removes all internal event listeners\n\t\taddEventListeners,\n\t\tremoveEventListeners,\n\t\tdispatchEvent,\n\n\t\t// Facility for persisting and restoring the presentation state\n\t\tgetState,\n\t\tsetState,\n\n\t\t// Presentation progress on range of 0-1\n\t\tgetProgress,\n\n\t\t// Returns the indices of the current, or specified, slide\n\t\tgetIndices,\n\n\t\t// Returns an Array of key:value maps of the attributes of each\n\t\t// slide in the deck\n\t\tgetSlidesAttributes,\n\n\t\t// Returns the number of slides that we have passed\n\t\tgetSlidePastCount,\n\n\t\t// Returns the total number of slides\n\t\tgetTotalSlides,\n\n\t\t// Returns the slide element at the specified index\n\t\tgetSlide,\n\n\t\t// Returns the previous slide element, may be null\n\t\tgetPreviousSlide: () => previousSlide,\n\n\t\t// Returns the current slide element\n\t\tgetCurrentSlide: () => currentSlide,\n\n\t\t// Returns the slide background element at the specified index\n\t\tgetSlideBackground,\n\n\t\t// Returns the speaker notes string for a slide, or null\n\t\tgetSlideNotes: notes.getSlideNotes.bind( notes ),\n\n\t\t// Returns an Array of all slides\n\t\tgetSlides,\n\n\t\t// Returns an array with all horizontal/vertical slides in the deck\n\t\tgetHorizontalSlides,\n\t\tgetVerticalSlides,\n\n\t\t// Checks if the presentation contains two or more horizontal\n\t\t// and vertical slides\n\t\thasHorizontalSlides,\n\t\thasVerticalSlides,\n\n\t\t// Checks if the deck has navigated on either axis at least once\n\t\thasNavigatedHorizontally: () => navigationHistory.hasNavigatedHorizontally,\n\t\thasNavigatedVertically: () => navigationHistory.hasNavigatedVertically,\n\n\t\t// Adds/removes a custom key binding\n\t\taddKeyBinding: keyboard.addKeyBinding.bind( keyboard ),\n\t\tremoveKeyBinding: keyboard.removeKeyBinding.bind( keyboard ),\n\n\t\t// Programmatically triggers a keyboard event\n\t\ttriggerKey: keyboard.triggerKey.bind( keyboard ),\n\n\t\t// Registers a new shortcut to include in the help overlay\n\t\tregisterKeyboardShortcut: keyboard.registerKeyboardShortcut.bind( keyboard ),\n\n\t\tgetComputedSlideSize,\n\n\t\t// Returns the current scale of the presentation content\n\t\tgetScale: () => scale,\n\n\t\t// Returns the current configuration object\n\t\tgetConfig: () => config,\n\n\t\t// Helper method, retrieves query string as a key:value map\n\t\tgetQueryHash: Util.getQueryHash,\n\n\t\t// Returns the path to the current slide as represented in the URL\n\t\tgetSlidePath: location.getHash.bind( location ),\n\n\t\t// Returns reveal.js DOM elements\n\t\tgetRevealElement: () => revealElement,\n\t\tgetSlidesElement: () => dom.slides,\n\t\tgetViewportElement: () => dom.viewport,\n\t\tgetBackgroundsElement: () => backgrounds.element,\n\n\t\t// API for registering and retrieving plugins\n\t\tregisterPlugin: plugins.registerPlugin.bind( plugins ),\n\t\thasPlugin: plugins.hasPlugin.bind( plugins ),\n\t\tgetPlugin: plugins.getPlugin.bind( plugins ),\n\t\tgetPlugins: plugins.getRegisteredPlugins.bind( plugins )\n\n\t};\n\n\t// Our internal API which controllers have access to\n\tUtil.extend( Reveal, {\n\t\t...API,\n\n\t\t// Methods for announcing content to screen readers\n\t\tannounceStatus,\n\t\tgetStatusText,\n\n\t\t// Controllers\n\t\tprint,\n\t\tfocus,\n\t\tprogress,\n\t\tcontrols,\n\t\tlocation,\n\t\toverview,\n\t\tfragments,\n\t\tslideContent,\n\t\tslideNumber,\n\n\t\tonUserInput,\n\t\tcloseOverlay,\n\t\tupdateSlidesVisibility,\n\t\tlayoutSlideContents,\n\t\ttransformSlides,\n\t\tcueAutoSlide,\n\t\tcancelAutoSlide\n\t} );\n\n\treturn API;\n\n};\n","import Deck, { VERSION } from './reveal.js'\n\n/**\n * Expose the Reveal class to the window. To create a\n * new instance:\n * let deck = new Reveal( document.querySelector( '.reveal' ), {\n *   controls: false\n * } );\n * deck.initialize().then(() => {\n *   // reveal.js is ready\n * });\n */\nlet Reveal = Deck;\n\n\n/**\n * The below is a thin shell that mimics the pre 4.0\n * reveal.js API and ensures backwards compatibility.\n * This API only allows for one Reveal instance per\n * page, whereas the new API above lets you run many\n * presentations on the same page.\n *\n * Reveal.initialize( { controls: false } ).then(() => {\n *   // reveal.js is ready\n * });\n */\n\nlet enqueuedAPICalls = [];\n\nReveal.initialize = options => {\n\n\t// Create our singleton reveal.js instance\n\tObject.assign( Reveal, new Deck( document.querySelector( '.reveal' ), options ) );\n\n\t// Invoke any enqueued API calls\n\tenqueuedAPICalls.map( method => method( Reveal ) );\n\n\treturn Reveal.initialize();\n\n}\n\n/**\n * The pre 4.0 API let you add event listener before\n * initializing. We maintain the same behavior by\n * queuing up premature API calls and invoking all\n * of them when Reveal.initialize is called.\n */\n[ 'configure', 'on', 'off', 'addEventListener', 'removeEventListener', 'registerPlugin' ].forEach( method => {\n\tReveal[method] = ( ...args ) => {\n\t\tenqueuedAPICalls.push( deck => deck[method].call( null, ...args ) );\n\t}\n} );\n\nReveal.isReady = () => false;\n\nReveal.VERSION = VERSION;\n\nexport default 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+{"version":3,"file":"reveal.esm.js","sources":["../js/utils/util.js","../js/utils/device.js","../node_modules/fitty/dist/fitty.module.js","../js/controllers/slidecontent.js","../js/controllers/slidenumber.js","../js/utils/color.js","../js/controllers/backgrounds.js","../js/utils/constants.js","../js/controllers/autoanimate.js","../js/controllers/fragments.js","../js/controllers/overview.js","../js/controllers/keyboard.js","../js/controllers/location.js","../js/controllers/controls.js","../js/controllers/progress.js","../js/controllers/pointer.js","../js/utils/loader.js","../js/controllers/plugins.js","../js/controllers/print.js","../js/controllers/touch.js","../js/controllers/focus.js","../js/controllers/notes.js","../js/components/playback.js","../js/config.js","../js/reveal.js","../js/index.js"],"sourcesContent":["/**\n * Extend object a with the properties of object b.\n * If there's a conflict, object b takes precedence.\n *\n * @param {object} a\n * @param {object} b\n */\nexport const extend = ( a, b ) => {\n\n\tfor( let i in b ) {\n\t\ta[ i ] = b[ i ];\n\t}\n\n\treturn a;\n\n}\n\n/**\n * querySelectorAll but returns an Array.\n */\nexport const queryAll = ( el, selector ) => {\n\n\treturn Array.from( el.querySelectorAll( selector ) );\n\n}\n\n/**\n * classList.toggle() with cross browser support\n */\nexport const toggleClass = ( el, className, value ) => {\n\tif( value ) {\n\t\tel.classList.add( className );\n\t}\n\telse {\n\t\tel.classList.remove( className );\n\t}\n}\n\n/**\n * Utility for deserializing a value.\n *\n * @param {*} value\n * @return {*}\n */\nexport const deserialize = ( value ) => {\n\n\tif( typeof value === 'string' ) {\n\t\tif( value === 'null' ) return null;\n\t\telse if( value === 'true' ) return true;\n\t\telse if( value === 'false' ) return false;\n\t\telse if( value.match( /^-?[\\d\\.]+$/ ) ) return parseFloat( value );\n\t}\n\n\treturn value;\n\n}\n\n/**\n * Measures the distance in pixels between point a\n * and point b.\n *\n * @param {object} a point with x/y properties\n * @param {object} b point with x/y properties\n *\n * @return {number}\n */\nexport const distanceBetween = ( a, b ) => {\n\n\tlet dx = a.x - b.x,\n\t\tdy = a.y - b.y;\n\n\treturn Math.sqrt( dx*dx + dy*dy );\n\n}\n\n/**\n * Applies a CSS transform to the target element.\n *\n * @param {HTMLElement} element\n * @param {string} transform\n */\nexport const transformElement = ( element, transform ) => {\n\n\telement.style.transform = transform;\n\n}\n\n/**\n * Element.matches with IE support.\n *\n * @param {HTMLElement} target The element to match\n * @param {String} selector The CSS selector to match\n * the element against\n *\n * @return {Boolean}\n */\nexport const matches = ( target, selector ) => {\n\n\tlet matchesMethod = target.matches || target.matchesSelector || target.msMatchesSelector;\n\n\treturn !!( matchesMethod && matchesMethod.call( target, selector ) );\n\n}\n\n/**\n * Find the closest parent that matches the given\n * selector.\n *\n * @param {HTMLElement} target The child element\n * @param {String} selector The CSS selector to match\n * the parents against\n *\n * @return {HTMLElement} The matched parent or null\n * if no matching parent was found\n */\nexport const closest = ( target, selector ) => {\n\n\t// Native Element.closest\n\tif( typeof target.closest === 'function' ) {\n\t\treturn target.closest( selector );\n\t}\n\n\t// Polyfill\n\twhile( target ) {\n\t\tif( matches( target, selector ) ) {\n\t\t\treturn target;\n\t\t}\n\n\t\t// Keep searching\n\t\ttarget = target.parentNode;\n\t}\n\n\treturn null;\n\n}\n\n/**\n * Handling the fullscreen functionality via the fullscreen API\n *\n * @see http://fullscreen.spec.whatwg.org/\n * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode\n */\nexport const enterFullscreen = element => {\n\n\telement = element || document.documentElement;\n\n\t// Check which implementation is available\n\tlet requestMethod = element.requestFullscreen ||\n\t\t\t\t\t\telement.webkitRequestFullscreen ||\n\t\t\t\t\t\telement.webkitRequestFullScreen ||\n\t\t\t\t\t\telement.mozRequestFullScreen ||\n\t\t\t\t\t\telement.msRequestFullscreen;\n\n\tif( requestMethod ) {\n\t\trequestMethod.apply( element );\n\t}\n\n}\n\n/**\n * Creates an HTML element and returns a reference to it.\n * If the element already exists the existing instance will\n * be returned.\n *\n * @param {HTMLElement} container\n * @param {string} tagname\n * @param {string} classname\n * @param {string} innerHTML\n *\n * @return {HTMLElement}\n */\nexport const createSingletonNode = ( container, tagname, classname, innerHTML='' ) => {\n\n\t// Find all nodes matching the description\n\tlet nodes = container.querySelectorAll( '.' + classname );\n\n\t// Check all matches to find one which is a direct child of\n\t// the specified container\n\tfor( let i = 0; i < nodes.length; i++ ) {\n\t\tlet testNode = nodes[i];\n\t\tif( testNode.parentNode === container ) {\n\t\t\treturn testNode;\n\t\t}\n\t}\n\n\t// If no node was found, create it now\n\tlet node = document.createElement( tagname );\n\tnode.className = classname;\n\tnode.innerHTML = innerHTML;\n\tcontainer.appendChild( node );\n\n\treturn node;\n\n}\n\n/**\n * Injects the given CSS styles into the DOM.\n *\n * @param {string} value\n */\nexport const createStyleSheet = ( value ) => {\n\n\tlet tag = document.createElement( 'style' );\n\ttag.type = 'text/css';\n\n\tif( value && value.length > 0 ) {\n\t\tif( tag.styleSheet ) {\n\t\t\ttag.styleSheet.cssText = value;\n\t\t}\n\t\telse {\n\t\t\ttag.appendChild( document.createTextNode( value ) );\n\t\t}\n\t}\n\n\tdocument.head.appendChild( tag );\n\n\treturn tag;\n\n}\n\n/**\n * Returns a key:value hash of all query params.\n */\nexport const getQueryHash = () => {\n\n\tlet query = {};\n\n\tlocation.search.replace( /[A-Z0-9]+?=([\\w\\.%-]*)/gi, a => {\n\t\tquery[ a.split( '=' ).shift() ] = a.split( '=' ).pop();\n\t} );\n\n\t// Basic deserialization\n\tfor( let i in query ) {\n\t\tlet value = query[ i ];\n\n\t\tquery[ i ] = deserialize( unescape( value ) );\n\t}\n\n\t// Do not accept new dependencies via query config to avoid\n\t// the potential of malicious script injection\n\tif( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];\n\n\treturn query;\n\n}\n\n/**\n * Returns the remaining height within the parent of the\n * target element.\n *\n * remaining height = [ configured parent height ] - [ current parent height ]\n *\n * @param {HTMLElement} element\n * @param {number} [height]\n */\nexport const getRemainingHeight = ( element, height = 0 ) => {\n\n\tif( element ) {\n\t\tlet newHeight, oldHeight = element.style.height;\n\n\t\t// Change the .stretch element height to 0 in order find the height of all\n\t\t// the other elements\n\t\telement.style.height = '0px';\n\n\t\t// In Overview mode, the parent (.slide) height is set of 700px.\n\t\t// Restore it temporarily to its natural height.\n\t\telement.parentNode.style.height = 'auto';\n\n\t\tnewHeight = height - element.parentNode.offsetHeight;\n\n\t\t// Restore the old height, just in case\n\t\telement.style.height = oldHeight + 'px';\n\n\t\t// Clear the parent (.slide) height. .removeProperty works in IE9+\n\t\telement.parentNode.style.removeProperty('height');\n\n\t\treturn newHeight;\n\t}\n\n\treturn height;\n\n}\n\nconst fileExtensionToMimeMap = {\n\t'mp4': 'video/mp4',\n\t'm4a': 'video/mp4',\n\t'ogv': 'video/ogg',\n\t'mpeg': 'video/mpeg',\n\t'webm': 'video/webm'\n}\n\n/**\n * Guess the MIME type for common file formats.\n */\nexport const getMimeTypeFromFile = ( filename='' ) => {\n\treturn fileExtensionToMimeMap[filename.split('.').pop()]\n}","const UA = navigator.userAgent;\n\nexport const isMobile = /(iphone|ipod|ipad|android)/gi.test( UA ) ||\n\t\t\t\t\t\t( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS\n\nexport const isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );\n\nexport const isAndroid = /android/gi.test( UA );","/*\n * fitty v2.3.3 - Snugly resizes text to fit its parent container\n * Copyright (c) 2020 Rik Schennink <rik@pqina.nl> (https://pqina.nl/)\n */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };\n\nexports.default = function (w) {\n\n  // no window, early exit\n  if (!w) return;\n\n  // node list to array helper method\n  var toArray = function toArray(nl) {\n    return [].slice.call(nl);\n  };\n\n  // states\n  var DrawState = {\n    IDLE: 0,\n    DIRTY_CONTENT: 1,\n    DIRTY_LAYOUT: 2,\n    DIRTY: 3\n  };\n\n  // all active fitty elements\n  var fitties = [];\n\n  // group all redraw calls till next frame, we cancel each frame request when a new one comes in. If no support for request animation frame, this is an empty function and supports for fitty stops.\n  var redrawFrame = null;\n  var requestRedraw = 'requestAnimationFrame' in w ? function () {\n    w.cancelAnimationFrame(redrawFrame);\n    redrawFrame = w.requestAnimationFrame(function () {\n      return redraw(fitties.filter(function (f) {\n        return f.dirty && f.active;\n      }));\n    });\n  } : function () {};\n\n  // sets all fitties to dirty so they are redrawn on the next redraw loop, then calls redraw\n  var redrawAll = function redrawAll(type) {\n    return function () {\n      fitties.forEach(function (f) {\n        return f.dirty = type;\n      });\n      requestRedraw();\n    };\n  };\n\n  // redraws fitties so they nicely fit their parent container\n  var redraw = function redraw(fitties) {\n\n    // getting info from the DOM at this point should not trigger a reflow, let's gather as much intel as possible before triggering a reflow\n\n    // check if styles of all fitties have been computed\n    fitties.filter(function (f) {\n      return !f.styleComputed;\n    }).forEach(function (f) {\n      f.styleComputed = computeStyle(f);\n    });\n\n    // restyle elements that require pre-styling, this triggers a reflow, please try to prevent by adding CSS rules (see docs)\n    fitties.filter(shouldPreStyle).forEach(applyStyle);\n\n    // we now determine which fitties should be redrawn\n    var fittiesToRedraw = fitties.filter(shouldRedraw);\n\n    // we calculate final styles for these fitties\n    fittiesToRedraw.forEach(calculateStyles);\n\n    // now we apply the calculated styles from our previous loop\n    fittiesToRedraw.forEach(function (f) {\n      applyStyle(f);\n      markAsClean(f);\n    });\n\n    // now we dispatch events for all restyled fitties\n    fittiesToRedraw.forEach(dispatchFitEvent);\n  };\n\n  var markAsClean = function markAsClean(f) {\n    return f.dirty = DrawState.IDLE;\n  };\n\n  var calculateStyles = function calculateStyles(f) {\n\n    // get available width from parent node\n    f.availableWidth = f.element.parentNode.clientWidth;\n\n    // the space our target element uses\n    f.currentWidth = f.element.scrollWidth;\n\n    // remember current font size\n    f.previousFontSize = f.currentFontSize;\n\n    // let's calculate the new font size\n    f.currentFontSize = Math.min(Math.max(f.minSize, f.availableWidth / f.currentWidth * f.previousFontSize), f.maxSize);\n\n    // if allows wrapping, only wrap when at minimum font size (otherwise would break container)\n    f.whiteSpace = f.multiLine && f.currentFontSize === f.minSize ? 'normal' : 'nowrap';\n  };\n\n  // should always redraw if is not dirty layout, if is dirty layout, only redraw if size has changed\n  var shouldRedraw = function shouldRedraw(f) {\n    return f.dirty !== DrawState.DIRTY_LAYOUT || f.dirty === DrawState.DIRTY_LAYOUT && f.element.parentNode.clientWidth !== f.availableWidth;\n  };\n\n  // every fitty element is tested for invalid styles\n  var computeStyle = function computeStyle(f) {\n\n    // get style properties\n    var style = w.getComputedStyle(f.element, null);\n\n    // get current font size in pixels (if we already calculated it, use the calculated version)\n    f.currentFontSize = parseFloat(style.getPropertyValue('font-size'));\n\n    // get display type and wrap mode\n    f.display = style.getPropertyValue('display');\n    f.whiteSpace = style.getPropertyValue('white-space');\n  };\n\n  // determines if this fitty requires initial styling, can be prevented by applying correct styles through CSS\n  var shouldPreStyle = function shouldPreStyle(f) {\n\n    var preStyle = false;\n\n    // if we already tested for prestyling we don't have to do it again\n    if (f.preStyleTestCompleted) return false;\n\n    // should have an inline style, if not, apply\n    if (!/inline-/.test(f.display)) {\n      preStyle = true;\n      f.display = 'inline-block';\n    }\n\n    // to correctly calculate dimensions the element should have whiteSpace set to nowrap\n    if (f.whiteSpace !== 'nowrap') {\n      preStyle = true;\n      f.whiteSpace = 'nowrap';\n    }\n\n    // we don't have to do this twice\n    f.preStyleTestCompleted = true;\n\n    return preStyle;\n  };\n\n  // apply styles to single fitty\n  var applyStyle = function applyStyle(f) {\n    f.element.style.whiteSpace = f.whiteSpace;\n    f.element.style.display = f.display;\n    f.element.style.fontSize = f.currentFontSize + 'px';\n  };\n\n  // dispatch a fit event on a fitty\n  var dispatchFitEvent = function dispatchFitEvent(f) {\n    f.element.dispatchEvent(new CustomEvent('fit', {\n      detail: {\n        oldValue: f.previousFontSize,\n        newValue: f.currentFontSize,\n        scaleFactor: f.currentFontSize / f.previousFontSize\n      }\n    }));\n  };\n\n  // fit method, marks the fitty as dirty and requests a redraw (this will also redraw any other fitty marked as dirty)\n  var fit = function fit(f, type) {\n    return function () {\n      f.dirty = type;\n      if (!f.active) return;\n      requestRedraw();\n    };\n  };\n\n  var init = function init(f) {\n\n    // save some of the original CSS properties before we change them\n    f.originalStyle = {\n      whiteSpace: f.element.style.whiteSpace,\n      display: f.element.style.display,\n      fontSize: f.element.style.fontSize\n    };\n\n    // should we observe DOM mutations\n    observeMutations(f);\n\n    // this is a new fitty so we need to validate if it's styles are in order\n    f.newbie = true;\n\n    // because it's a new fitty it should also be dirty, we want it to redraw on the first loop\n    f.dirty = true;\n\n    // we want to be able to update this fitty\n    fitties.push(f);\n  };\n\n  var destroy = function destroy(f) {\n    return function () {\n\n      // remove from fitties array\n      fitties = fitties.filter(function (_) {\n        return _.element !== f.element;\n      });\n\n      // stop observing DOM\n      if (f.observeMutations) f.observer.disconnect();\n\n      // reset the CSS properties we changes\n      f.element.style.whiteSpace = f.originalStyle.whiteSpace;\n      f.element.style.display = f.originalStyle.display;\n      f.element.style.fontSize = f.originalStyle.fontSize;\n    };\n  };\n\n  // add a new fitty, does not redraw said fitty\n  var subscribe = function subscribe(f) {\n    return function () {\n      if (f.active) return;\n      f.active = true;\n      requestRedraw();\n    };\n  };\n\n  // remove an existing fitty\n  var unsubscribe = function unsubscribe(f) {\n    return function () {\n      return f.active = false;\n    };\n  };\n\n  var observeMutations = function observeMutations(f) {\n\n    // no observing?\n    if (!f.observeMutations) return;\n\n    // start observing mutations\n    f.observer = new MutationObserver(fit(f, DrawState.DIRTY_CONTENT));\n\n    // start observing\n    f.observer.observe(f.element, f.observeMutations);\n  };\n\n  // default mutation observer settings\n  var mutationObserverDefaultSetting = {\n    subtree: true,\n    childList: true,\n    characterData: true\n  };\n\n  // default fitty options\n  var defaultOptions = {\n    minSize: 16,\n    maxSize: 512,\n    multiLine: true,\n    observeMutations: 'MutationObserver' in w ? mutationObserverDefaultSetting : false\n  };\n\n  // array of elements in, fitty instances out\n  function fittyCreate(elements, options) {\n\n    // set options object\n    var fittyOptions = _extends({}, defaultOptions, options);\n\n    // create fitties\n    var publicFitties = elements.map(function (element) {\n\n      // create fitty instance\n      var f = _extends({}, fittyOptions, {\n\n        // internal options for this fitty\n        element: element,\n        active: true\n      });\n\n      // initialise this fitty\n      init(f);\n\n      // expose API\n      return {\n        element: element,\n        fit: fit(f, DrawState.DIRTY),\n        unfreeze: subscribe(f),\n        freeze: unsubscribe(f),\n        unsubscribe: destroy(f)\n      };\n    });\n\n    // call redraw on newly initiated fitties\n    requestRedraw();\n\n    // expose fitties\n    return publicFitties;\n  }\n\n  // fitty creation function\n  function fitty(target) {\n    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n\n\n    // if target is a string\n    return typeof target === 'string' ?\n\n    // treat it as a querySelector\n    fittyCreate(toArray(document.querySelectorAll(target)), options) :\n\n    // create single fitty\n    fittyCreate([target], options)[0];\n  }\n\n  // handles viewport changes, redraws all fitties, but only does so after a timeout\n  var resizeDebounce = null;\n  var onWindowResized = function onWindowResized() {\n    w.clearTimeout(resizeDebounce);\n    resizeDebounce = w.setTimeout(redrawAll(DrawState.DIRTY_LAYOUT), fitty.observeWindowDelay);\n  };\n\n  // define observe window property, so when we set it to true or false events are automatically added and removed\n  var events = ['resize', 'orientationchange'];\n  Object.defineProperty(fitty, 'observeWindow', {\n    set: function set(enabled) {\n      var method = (enabled ? 'add' : 'remove') + 'EventListener';\n      events.forEach(function (e) {\n        w[method](e, onWindowResized);\n      });\n    }\n  });\n\n  // fitty global properties (by setting observeWindow to true the events above get added)\n  fitty.observeWindow = true;\n  fitty.observeWindowDelay = 100;\n\n  // public fit all method, will force redraw no matter what\n  fitty.fitAll = redrawAll(DrawState.DIRTY);\n\n  // export our fitty function, we don't want to keep it to our selves\n  return fitty;\n}(typeof window === 'undefined' ? null : window);","import { extend, queryAll, closest, getMimeTypeFromFile } from '../utils/util.js'\nimport { isMobile } from '../utils/device.js'\n\nimport fitty from 'fitty';\n\n/**\n * Handles loading, unloading and playback of slide\n * content such as images, videos and iframes.\n */\nexport default class SlideContent {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.startEmbeddedIframe = this.startEmbeddedIframe.bind( this );\n\n\t}\n\n\t/**\n\t * Should the given element be preloaded?\n\t * Decides based on local element attributes and global config.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tshouldPreload( element ) {\n\n\t\t// Prefer an explicit global preload setting\n\t\tlet preload = this.Reveal.getConfig().preloadIframes;\n\n\t\t// If no global setting is available, fall back on the element's\n\t\t// own preload setting\n\t\tif( typeof preload !== 'boolean' ) {\n\t\t\tpreload = element.hasAttribute( 'data-preload' );\n\t\t}\n\n\t\treturn preload;\n\t}\n\n\t/**\n\t * Called when the given slide is within the configured view\n\t * distance. Shows the slide element and loads any content\n\t * that is set to load lazily (data-src).\n\t *\n\t * @param {HTMLElement} slide Slide to show\n\t */\n\tload( slide, options = {} ) {\n\n\t\t// Show the slide element\n\t\tslide.style.display = this.Reveal.getConfig().display;\n\n\t\t// Media elements with data-src attributes\n\t\tqueryAll( slide, 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ).forEach( element => {\n\t\t\tif( element.tagName !== 'IFRAME' || this.shouldPreload( element ) ) {\n\t\t\t\telement.setAttribute( 'src', element.getAttribute( 'data-src' ) );\n\t\t\t\telement.setAttribute( 'data-lazy-loaded', '' );\n\t\t\t\telement.removeAttribute( 'data-src' );\n\t\t\t}\n\t\t} );\n\n\t\t// Media elements with <source> children\n\t\tqueryAll( slide, 'video, audio' ).forEach( media => {\n\t\t\tlet sources = 0;\n\n\t\t\tqueryAll( media, 'source[data-src]' ).forEach( source => {\n\t\t\t\tsource.setAttribute( 'src', source.getAttribute( 'data-src' ) );\n\t\t\t\tsource.removeAttribute( 'data-src' );\n\t\t\t\tsource.setAttribute( 'data-lazy-loaded', '' );\n\t\t\t\tsources += 1;\n\t\t\t} );\n\n\t\t\t// Enable inline video playback in mobile Safari\n\t\t\tif( isMobile && media.tagName === 'VIDEO' ) {\n\t\t\t\tmedia.setAttribute( 'playsinline', '' );\n\t\t\t}\n\n\t\t\t// If we rewrote sources for this video/audio element, we need\n\t\t\t// to manually tell it to load from its new origin\n\t\t\tif( sources > 0 ) {\n\t\t\t\tmedia.load();\n\t\t\t}\n\t\t} );\n\n\n\t\t// Show the corresponding background element\n\t\tlet background = slide.slideBackgroundElement;\n\t\tif( background ) {\n\t\t\tbackground.style.display = 'block';\n\n\t\t\tlet backgroundContent = slide.slideBackgroundContentElement;\n\t\t\tlet backgroundIframe = slide.getAttribute( 'data-background-iframe' );\n\n\t\t\t// If the background contains media, load it\n\t\t\tif( background.hasAttribute( 'data-loaded' ) === false ) {\n\t\t\t\tbackground.setAttribute( 'data-loaded', 'true' );\n\n\t\t\t\tlet backgroundImage = slide.getAttribute( 'data-background-image' ),\n\t\t\t\t\tbackgroundVideo = slide.getAttribute( 'data-background-video' ),\n\t\t\t\t\tbackgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),\n\t\t\t\t\tbackgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );\n\n\t\t\t\t// Images\n\t\t\t\tif( backgroundImage ) {\n\t\t\t\t\t// base64\n\t\t\t\t\tif(  /^data:/.test( backgroundImage.trim() ) ) {\n\t\t\t\t\t\tbackgroundContent.style.backgroundImage = `url(${backgroundImage.trim()})`;\n\t\t\t\t\t}\n\t\t\t\t\t// URL(s)\n\t\t\t\t\telse {\n\t\t\t\t\t\tbackgroundContent.style.backgroundImage = backgroundImage.split( ',' ).map( background => {\n\t\t\t\t\t\t\treturn `url(${encodeURI(background.trim())})`;\n\t\t\t\t\t\t}).join( ',' );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Videos\n\t\t\t\telse if ( backgroundVideo && !this.Reveal.isSpeakerNotes() ) {\n\t\t\t\t\tlet video = document.createElement( 'video' );\n\n\t\t\t\t\tif( backgroundVideoLoop ) {\n\t\t\t\t\t\tvideo.setAttribute( 'loop', '' );\n\t\t\t\t\t}\n\n\t\t\t\t\tif( backgroundVideoMuted ) {\n\t\t\t\t\t\tvideo.muted = true;\n\t\t\t\t\t}\n\n\t\t\t\t\t// Enable inline playback in mobile Safari\n\t\t\t\t\t//\n\t\t\t\t\t// Mute is required for video to play when using\n\t\t\t\t\t// swipe gestures to navigate since they don't\n\t\t\t\t\t// count as direct user actions :'(\n\t\t\t\t\tif( isMobile ) {\n\t\t\t\t\t\tvideo.muted = true;\n\t\t\t\t\t\tvideo.setAttribute( 'playsinline', '' );\n\t\t\t\t\t}\n\n\t\t\t\t\t// Support comma separated lists of video sources\n\t\t\t\t\tbackgroundVideo.split( ',' ).forEach( source => {\n\t\t\t\t\t\tlet type = getMimeTypeFromFile( source );\n\t\t\t\t\t\tif( type ) {\n\t\t\t\t\t\t\tvideo.innerHTML += `<source src=\"${source}\" type=\"${type}\">`;\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tvideo.innerHTML += `<source src=\"${source}\">`;\n\t\t\t\t\t\t}\n\t\t\t\t\t} );\n\n\t\t\t\t\tbackgroundContent.appendChild( video );\n\t\t\t\t}\n\t\t\t\t// Iframes\n\t\t\t\telse if( backgroundIframe && options.excludeIframes !== true ) {\n\t\t\t\t\tlet iframe = document.createElement( 'iframe' );\n\t\t\t\t\tiframe.setAttribute( 'allowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'mozallowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'webkitallowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'allow', 'autoplay' );\n\n\t\t\t\t\tiframe.setAttribute( 'data-src', backgroundIframe );\n\n\t\t\t\t\tiframe.style.width  = '100%';\n\t\t\t\t\tiframe.style.height = '100%';\n\t\t\t\t\tiframe.style.maxHeight = '100%';\n\t\t\t\t\tiframe.style.maxWidth = '100%';\n\n\t\t\t\t\tbackgroundContent.appendChild( iframe );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Start loading preloadable iframes\n\t\t\tlet backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );\n\t\t\tif( backgroundIframeElement ) {\n\n\t\t\t\t// Check if this iframe is eligible to be preloaded\n\t\t\t\tif( this.shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {\n\t\t\t\t\tif( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {\n\t\t\t\t\t\tbackgroundIframeElement.setAttribute( 'src', backgroundIframe );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\tthis.layout( slide );\n\n\t}\n\n\t/**\n\t * Applies JS-dependent layout helpers for the scope.\n\t */\n\tlayout( scopeElement ) {\n\n\t\t// Autosize text with the r-fit-text class based on the\n\t\t// size of its container. This needs to happen after the\n\t\t// slide is visible in order to measure the text.\n\t\tArray.from( scopeElement.querySelectorAll( '.r-fit-text' ) ).forEach( element => {\n\t\t\tfitty( element, {\n\t\t\t\tminSize: 24,\n\t\t\t\tmaxSize: this.Reveal.getConfig().height * 0.8,\n\t\t\t\tobserveMutations: false,\n\t\t\t\tobserveWindow: false\n\t\t\t} );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Unloads and hides the given slide. This is called when the\n\t * slide is moved outside of the configured view distance.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tunload( slide ) {\n\n\t\t// Hide the slide element\n\t\tslide.style.display = 'none';\n\n\t\t// Hide the corresponding background element\n\t\tlet background = this.Reveal.getSlideBackground( slide );\n\t\tif( background ) {\n\t\t\tbackground.style.display = 'none';\n\n\t\t\t// Unload any background iframes\n\t\t\tqueryAll( background, 'iframe[src]' ).forEach( element => {\n\t\t\t\telement.removeAttribute( 'src' );\n\t\t\t} );\n\t\t}\n\n\t\t// Reset lazy-loaded media elements with src attributes\n\t\tqueryAll( slide, 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ).forEach( element => {\n\t\t\telement.setAttribute( 'data-src', element.getAttribute( 'src' ) );\n\t\t\telement.removeAttribute( 'src' );\n\t\t} );\n\n\t\t// Reset lazy-loaded media elements with <source> children\n\t\tqueryAll( slide, 'video[data-lazy-loaded] source[src], audio source[src]' ).forEach( source => {\n\t\t\tsource.setAttribute( 'data-src', source.getAttribute( 'src' ) );\n\t\t\tsource.removeAttribute( 'src' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Enforces origin-specific format rules for embedded media.\n\t */\n\tformatEmbeddedContent() {\n\n\t\tlet _appendParamToIframeSource = ( sourceAttribute, sourceURL, param ) => {\n\t\t\tqueryAll( this.Reveal.getSlidesElement(), 'iframe['+ sourceAttribute +'*=\"'+ sourceURL +'\"]' ).forEach( el => {\n\t\t\t\tlet src = el.getAttribute( sourceAttribute );\n\t\t\t\tif( src && src.indexOf( param ) === -1 ) {\n\t\t\t\t\tel.setAttribute( sourceAttribute, src + ( !/\\?/.test( src ) ? '?' : '&' ) + param );\n\t\t\t\t}\n\t\t\t});\n\t\t};\n\n\t\t// YouTube frames must include \"?enablejsapi=1\"\n\t\t_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );\n\t\t_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );\n\n\t\t// Vimeo frames must include \"?api=1\"\n\t\t_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );\n\t\t_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );\n\n\t}\n\n\t/**\n\t * Start playback of any embedded content inside of\n\t * the given element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tstartEmbeddedContent( element ) {\n\n\t\tif( element && !this.Reveal.isSpeakerNotes() ) {\n\n\t\t\t// Restart GIFs\n\t\t\tqueryAll( element, 'img[src$=\".gif\"]' ).forEach( el => {\n\t\t\t\t// Setting the same unchanged source like this was confirmed\n\t\t\t\t// to work in Chrome, FF & Safari\n\t\t\t\tel.setAttribute( 'src', el.getAttribute( 'src' ) );\n\t\t\t} );\n\n\t\t\t// HTML5 media elements\n\t\t\tqueryAll( element, 'video, audio' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\t// Prefer an explicit global autoplay setting\n\t\t\t\tlet autoplay = this.Reveal.getConfig().autoPlayMedia;\n\n\t\t\t\t// If no global setting is available, fall back on the element's\n\t\t\t\t// own autoplay setting\n\t\t\t\tif( typeof autoplay !== 'boolean' ) {\n\t\t\t\t\tautoplay = el.hasAttribute( 'data-autoplay' ) || !!closest( el, '.slide-background' );\n\t\t\t\t}\n\n\t\t\t\tif( autoplay && typeof el.play === 'function' ) {\n\n\t\t\t\t\t// If the media is ready, start playback\n\t\t\t\t\tif( el.readyState > 1 ) {\n\t\t\t\t\t\tthis.startEmbeddedMedia( { target: el } );\n\t\t\t\t\t}\n\t\t\t\t\t// Mobile devices never fire a loaded event so instead\n\t\t\t\t\t// of waiting, we initiate playback\n\t\t\t\t\telse if( isMobile ) {\n\t\t\t\t\t\tlet promise = el.play();\n\n\t\t\t\t\t\t// If autoplay does not work, ensure that the controls are visible so\n\t\t\t\t\t\t// that the viewer can start the media on their own\n\t\t\t\t\t\tif( promise && typeof promise.catch === 'function' && el.controls === false ) {\n\t\t\t\t\t\t\tpromise.catch( () => {\n\t\t\t\t\t\t\t\tel.controls = true;\n\n\t\t\t\t\t\t\t\t// Once the video does start playing, hide the controls again\n\t\t\t\t\t\t\t\tel.addEventListener( 'play', () => {\n\t\t\t\t\t\t\t\t\tel.controls = false;\n\t\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\t// If the media isn't loaded, wait before playing\n\t\t\t\t\telse {\n\t\t\t\t\t\tel.removeEventListener( 'loadeddata', this.startEmbeddedMedia ); // remove first to avoid dupes\n\t\t\t\t\t\tel.addEventListener( 'loadeddata', this.startEmbeddedMedia );\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Normal iframes\n\t\t\tqueryAll( element, 'iframe[src]' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tthis.startEmbeddedIframe( { target: el } );\n\t\t\t} );\n\n\t\t\t// Lazy loading iframes\n\t\t\tqueryAll( element, 'iframe[data-src]' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tif( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {\n\t\t\t\t\tel.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes\n\t\t\t\t\tel.addEventListener( 'load', this.startEmbeddedIframe );\n\t\t\t\t\tel.setAttribute( 'src', el.getAttribute( 'data-src' ) );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Starts playing an embedded video/audio element after\n\t * it has finished loading.\n\t *\n\t * @param {object} event\n\t */\n\tstartEmbeddedMedia( event ) {\n\n\t\tlet isAttachedToDOM = !!closest( event.target, 'html' ),\n\t\t\tisVisible  \t\t= !!closest( event.target, '.present' );\n\n\t\tif( isAttachedToDOM && isVisible ) {\n\t\t\tevent.target.currentTime = 0;\n\t\t\tevent.target.play();\n\t\t}\n\n\t\tevent.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );\n\n\t}\n\n\t/**\n\t * \"Starts\" the content of an embedded iframe using the\n\t * postMessage API.\n\t *\n\t * @param {object} event\n\t */\n\tstartEmbeddedIframe( event ) {\n\n\t\tlet iframe = event.target;\n\n\t\tif( iframe && iframe.contentWindow ) {\n\n\t\t\tlet isAttachedToDOM = !!closest( event.target, 'html' ),\n\t\t\t\tisVisible  \t\t= !!closest( event.target, '.present' );\n\n\t\t\tif( isAttachedToDOM && isVisible ) {\n\n\t\t\t\t// Prefer an explicit global autoplay setting\n\t\t\t\tlet autoplay = this.Reveal.getConfig().autoPlayMedia;\n\n\t\t\t\t// If no global setting is available, fall back on the element's\n\t\t\t\t// own autoplay setting\n\t\t\t\tif( typeof autoplay !== 'boolean' ) {\n\t\t\t\t\tautoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closest( iframe, '.slide-background' );\n\t\t\t\t}\n\n\t\t\t\t// YouTube postMessage API\n\t\t\t\tif( /youtube\\.com\\/embed\\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {\n\t\t\t\t\tiframe.contentWindow.postMessage( '{\"event\":\"command\",\"func\":\"playVideo\",\"args\":\"\"}', '*' );\n\t\t\t\t}\n\t\t\t\t// Vimeo postMessage API\n\t\t\t\telse if( /player\\.vimeo\\.com\\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {\n\t\t\t\t\tiframe.contentWindow.postMessage( '{\"method\":\"play\"}', '*' );\n\t\t\t\t}\n\t\t\t\t// Generic postMessage API\n\t\t\t\telse {\n\t\t\t\t\tiframe.contentWindow.postMessage( 'slide:start', '*' );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Stop playback of any embedded content inside of\n\t * the targeted slide.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tstopEmbeddedContent( element, options = {} ) {\n\n\t\toptions = extend( {\n\t\t\t// Defaults\n\t\t\tunloadIframes: true\n\t\t}, options );\n\n\t\tif( element && element.parentNode ) {\n\t\t\t// HTML5 media elements\n\t\t\tqueryAll( element, 'video, audio' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {\n\t\t\t\t\tel.setAttribute('data-paused-by-reveal', '');\n\t\t\t\t\tel.pause();\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Generic postMessage API for non-lazy loaded iframes\n\t\t\tqueryAll( element, 'iframe' ).forEach( el => {\n\t\t\t\tif( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );\n\t\t\t\tel.removeEventListener( 'load', this.startEmbeddedIframe );\n\t\t\t});\n\n\t\t\t// YouTube postMessage API\n\t\t\tqueryAll( element, 'iframe[src*=\"youtube.com/embed/\"]' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {\n\t\t\t\t\tel.contentWindow.postMessage( '{\"event\":\"command\",\"func\":\"pauseVideo\",\"args\":\"\"}', '*' );\n\t\t\t\t}\n\t\t\t});\n\n\t\t\t// Vimeo postMessage API\n\t\t\tqueryAll( element, 'iframe[src*=\"player.vimeo.com/\"]' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {\n\t\t\t\t\tel.contentWindow.postMessage( '{\"method\":\"pause\"}', '*' );\n\t\t\t\t}\n\t\t\t});\n\n\t\t\tif( options.unloadIframes === true ) {\n\t\t\t\t// Unload lazy-loaded iframes\n\t\t\t\tqueryAll( element, 'iframe[data-src]' ).forEach( el => {\n\t\t\t\t\t// Only removing the src doesn't actually unload the frame\n\t\t\t\t\t// in all browsers (Firefox) so we set it to blank first\n\t\t\t\t\tel.setAttribute( 'src', 'about:blank' );\n\t\t\t\t\tel.removeAttribute( 'src' );\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t}\n\n}\n","/**\n * Handles the display of reveal.js' optional slide number.\n */\nexport default class SlideNumber {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'slide-number';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tlet slideNumberDisplay = 'none';\n\t\tif( config.slideNumber && !this.Reveal.isPrintingPDF() ) {\n\t\t\tif( config.showSlideNumber === 'all' ) {\n\t\t\t\tslideNumberDisplay = 'block';\n\t\t\t}\n\t\t\telse if( config.showSlideNumber === 'speaker' && this.Reveal.isSpeakerNotes() ) {\n\t\t\t\tslideNumberDisplay = 'block';\n\t\t\t}\n\t\t}\n\n\t\tthis.element.style.display = slideNumberDisplay;\n\n\t}\n\n\t/**\n\t * Updates the slide number to match the current slide.\n\t */\n\tupdate() {\n\n\t\t// Update slide number if enabled\n\t\tif( this.Reveal.getConfig().slideNumber && this.element ) {\n\t\t\tthis.element.innerHTML = this.getSlideNumber();\n\t\t}\n\n\t}\n\n\t/**\n\t * Returns the HTML string corresponding to the current slide\n\t * number, including formatting.\n\t */\n\tgetSlideNumber( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\t\tlet value;\n\t\tlet format = 'h.v';\n\n\t\tif ( typeof config.slideNumber === 'function' ) {\n\t\t\tvalue = config.slideNumber( slide );\n\t\t} else {\n\t\t\t// Check if a custom number format is available\n\t\t\tif( typeof config.slideNumber === 'string' ) {\n\t\t\t\tformat = config.slideNumber;\n\t\t\t}\n\n\t\t\t// If there are ONLY vertical slides in this deck, always use\n\t\t\t// a flattened slide number\n\t\t\tif( !/c/.test( format ) && this.Reveal.getHorizontalSlides().length === 1 ) {\n\t\t\t\tformat = 'c';\n\t\t\t}\n\n\t\t\t// Offset the current slide number by 1 to make it 1-indexed\n\t\t\tlet horizontalOffset = slide && slide.dataset.visibility === 'uncounted' ? 0 : 1;\n\n\t\t\tvalue = [];\n\t\t\tswitch( format ) {\n\t\t\t\tcase 'c':\n\t\t\t\t\tvalue.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset );\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'c/t':\n\t\t\t\t\tvalue.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset, '/', this.Reveal.getTotalSlides() );\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tlet indices = this.Reveal.getIndices( slide );\n\t\t\t\t\tvalue.push( indices.h + horizontalOffset );\n\t\t\t\t\tlet sep = format === 'h/v' ? '/' : '.';\n\t\t\t\t\tif( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );\n\t\t\t}\n\t\t}\n\n\t\tlet url = '#' + this.Reveal.location.getHash( slide );\n\t\treturn this.formatNumber( value[0], value[1], value[2], url );\n\n\t}\n\n\t/**\n\t * Applies HTML formatting to a slide number before it's\n\t * written to the DOM.\n\t *\n\t * @param {number} a Current slide\n\t * @param {string} delimiter Character to separate slide numbers\n\t * @param {(number|*)} b Total slides\n\t * @param {HTMLElement} [url='#'+locationHash()] The url to link to\n\t * @return {string} HTML string fragment\n\t */\n\tformatNumber( a, delimiter, b, url = '#' + this.Reveal.location.getHash() ) {\n\n\t\tif( typeof b === 'number' && !isNaN( b ) ) {\n\t\t\treturn  `<a href=\"${url}\">\n\t\t\t\t\t<span class=\"slide-number-a\">${a}</span>\n\t\t\t\t\t<span class=\"slide-number-delimiter\">${delimiter}</span>\n\t\t\t\t\t<span class=\"slide-number-b\">${b}</span>\n\t\t\t\t\t</a>`;\n\t\t}\n\t\telse {\n\t\t\treturn `<a href=\"${url}\">\n\t\t\t\t\t<span class=\"slide-number-a\">${a}</span>\n\t\t\t\t\t</a>`;\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","/**\n * Converts various color input formats to an {r:0,g:0,b:0} object.\n *\n * @param {string} color The string representation of a color\n * @example\n * colorToRgb('#000');\n * @example\n * colorToRgb('#000000');\n * @example\n * colorToRgb('rgb(0,0,0)');\n * @example\n * colorToRgb('rgba(0,0,0)');\n *\n * @return {{r: number, g: number, b: number, [a]: number}|null}\n */\nexport const colorToRgb = ( color ) => {\n\n\tlet hex3 = color.match( /^#([0-9a-f]{3})$/i );\n\tif( hex3 && hex3[1] ) {\n\t\thex3 = hex3[1];\n\t\treturn {\n\t\t\tr: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,\n\t\t\tg: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,\n\t\t\tb: parseInt( hex3.charAt( 2 ), 16 ) * 0x11\n\t\t};\n\t}\n\n\tlet hex6 = color.match( /^#([0-9a-f]{6})$/i );\n\tif( hex6 && hex6[1] ) {\n\t\thex6 = hex6[1];\n\t\treturn {\n\t\t\tr: parseInt( hex6.slice( 0, 2 ), 16 ),\n\t\t\tg: parseInt( hex6.slice( 2, 4 ), 16 ),\n\t\t\tb: parseInt( hex6.slice( 4, 6 ), 16 )\n\t\t};\n\t}\n\n\tlet rgb = color.match( /^rgb\\s*\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\)$/i );\n\tif( rgb ) {\n\t\treturn {\n\t\t\tr: parseInt( rgb[1], 10 ),\n\t\t\tg: parseInt( rgb[2], 10 ),\n\t\t\tb: parseInt( rgb[3], 10 )\n\t\t};\n\t}\n\n\tlet rgba = color.match( /^rgba\\s*\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\,\\s*([\\d]+|[\\d]*.[\\d]+)\\s*\\)$/i );\n\tif( rgba ) {\n\t\treturn {\n\t\t\tr: parseInt( rgba[1], 10 ),\n\t\t\tg: parseInt( rgba[2], 10 ),\n\t\t\tb: parseInt( rgba[3], 10 ),\n\t\t\ta: parseFloat( rgba[4] )\n\t\t};\n\t}\n\n\treturn null;\n\n}\n\n/**\n * Calculates brightness on a scale of 0-255.\n *\n * @param {string} color See colorToRgb for supported formats.\n * @see {@link colorToRgb}\n */\nexport const colorBrightness = ( color ) => {\n\n\tif( typeof color === 'string' ) color = colorToRgb( color );\n\n\tif( color ) {\n\t\treturn ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;\n\t}\n\n\treturn null;\n\n}","import { queryAll } from '../utils/util.js'\nimport { colorToRgb, colorBrightness } from '../utils/color.js'\n\n/**\n * Creates and updates slide backgrounds.\n */\nexport default class Backgrounds {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'backgrounds';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Creates the slide background elements and appends them\n\t * to the background container. One element is created per\n\t * slide no matter if the given slide has visible background.\n\t */\n\tcreate() {\n\n\t\t// Clear prior backgrounds\n\t\tthis.element.innerHTML = '';\n\t\tthis.element.classList.add( 'no-transition' );\n\n\t\t// Iterate over all horizontal slides\n\t\tthis.Reveal.getHorizontalSlides().forEach( slideh => {\n\n\t\t\tlet backgroundStack = this.createBackground( slideh, this.element );\n\n\t\t\t// Iterate over all vertical slides\n\t\t\tqueryAll( slideh, 'section' ).forEach( slidev => {\n\n\t\t\t\tthis.createBackground( slidev, backgroundStack );\n\n\t\t\t\tbackgroundStack.classList.add( 'stack' );\n\n\t\t\t} );\n\n\t\t} );\n\n\t\t// Add parallax background if specified\n\t\tif( this.Reveal.getConfig().parallaxBackgroundImage ) {\n\n\t\t\tthis.element.style.backgroundImage = 'url(\"' + this.Reveal.getConfig().parallaxBackgroundImage + '\")';\n\t\t\tthis.element.style.backgroundSize = this.Reveal.getConfig().parallaxBackgroundSize;\n\t\t\tthis.element.style.backgroundRepeat = this.Reveal.getConfig().parallaxBackgroundRepeat;\n\t\t\tthis.element.style.backgroundPosition = this.Reveal.getConfig().parallaxBackgroundPosition;\n\n\t\t\t// Make sure the below properties are set on the element - these properties are\n\t\t\t// needed for proper transitions to be set on the element via CSS. To remove\n\t\t\t// annoying background slide-in effect when the presentation starts, apply\n\t\t\t// these properties after short time delay\n\t\t\tsetTimeout( () => {\n\t\t\t\tthis.Reveal.getRevealElement().classList.add( 'has-parallax-background' );\n\t\t\t}, 1 );\n\n\t\t}\n\t\telse {\n\n\t\t\tthis.element.style.backgroundImage = '';\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'has-parallax-background' );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Creates a background for the given slide.\n\t *\n\t * @param {HTMLElement} slide\n\t * @param {HTMLElement} container The element that the background\n\t * should be appended to\n\t * @return {HTMLElement} New background div\n\t */\n\tcreateBackground( slide, container ) {\n\n\t\t// Main slide background element\n\t\tlet element = document.createElement( 'div' );\n\t\telement.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );\n\n\t\t// Inner background element that wraps images/videos/iframes\n\t\tlet contentElement = document.createElement( 'div' );\n\t\tcontentElement.className = 'slide-background-content';\n\n\t\telement.appendChild( contentElement );\n\t\tcontainer.appendChild( element );\n\n\t\tslide.slideBackgroundElement = element;\n\t\tslide.slideBackgroundContentElement = contentElement;\n\n\t\t// Syncs the background to reflect all current background settings\n\t\tthis.sync( slide );\n\n\t\treturn element;\n\n\t}\n\n\t/**\n\t * Renders all of the visual properties of a slide background\n\t * based on the various background attributes.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tsync( slide ) {\n\n\t\tconst element = slide.slideBackgroundElement,\n\t\t\tcontentElement = slide.slideBackgroundContentElement;\n\n\t\tconst data = {\n\t\t\tbackground: slide.getAttribute( 'data-background' ),\n\t\t\tbackgroundSize: slide.getAttribute( 'data-background-size' ),\n\t\t\tbackgroundImage: slide.getAttribute( 'data-background-image' ),\n\t\t\tbackgroundVideo: slide.getAttribute( 'data-background-video' ),\n\t\t\tbackgroundIframe: slide.getAttribute( 'data-background-iframe' ),\n\t\t\tbackgroundColor: slide.getAttribute( 'data-background-color' ),\n\t\t\tbackgroundGradient: slide.getAttribute( 'data-background-gradient' ),\n\t\t\tbackgroundRepeat: slide.getAttribute( 'data-background-repeat' ),\n\t\t\tbackgroundPosition: slide.getAttribute( 'data-background-position' ),\n\t\t\tbackgroundTransition: slide.getAttribute( 'data-background-transition' ),\n\t\t\tbackgroundOpacity: slide.getAttribute( 'data-background-opacity' ),\n\t\t};\n\n\t\tconst dataPreload = slide.hasAttribute( 'data-preload' );\n\n\t\t// Reset the prior background state in case this is not the\n\t\t// initial sync\n\t\tslide.classList.remove( 'has-dark-background' );\n\t\tslide.classList.remove( 'has-light-background' );\n\n\t\telement.removeAttribute( 'data-loaded' );\n\t\telement.removeAttribute( 'data-background-hash' );\n\t\telement.removeAttribute( 'data-background-size' );\n\t\telement.removeAttribute( 'data-background-transition' );\n\t\telement.style.backgroundColor = '';\n\n\t\tcontentElement.style.backgroundSize = '';\n\t\tcontentElement.style.backgroundRepeat = '';\n\t\tcontentElement.style.backgroundPosition = '';\n\t\tcontentElement.style.backgroundImage = '';\n\t\tcontentElement.style.opacity = '';\n\t\tcontentElement.innerHTML = '';\n\n\t\tif( data.background ) {\n\t\t\t// Auto-wrap image urls in url(...)\n\t\t\tif( /^(http|file|\\/\\/)/gi.test( data.background ) || /\\.(svg|png|jpg|jpeg|gif|bmp|webp)([?#\\s]|$)/gi.test( data.background ) ) {\n\t\t\t\tslide.setAttribute( 'data-background-image', data.background );\n\t\t\t}\n\t\t\telse {\n\t\t\t\telement.style.background = data.background;\n\t\t\t}\n\t\t}\n\n\t\t// Create a hash for this combination of background settings.\n\t\t// This is used to determine when two slide backgrounds are\n\t\t// the same.\n\t\tif( data.background || data.backgroundColor || data.backgroundGradient || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {\n\t\t\telement.setAttribute( 'data-background-hash', data.background +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundSize +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundImage +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundVideo +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundIframe +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundColor +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundGradient +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundRepeat +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundPosition +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundTransition +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundOpacity );\n\t\t}\n\n\t\t// Additional and optional background properties\n\t\tif( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );\n\t\tif( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;\n\t\tif( data.backgroundGradient ) element.style.backgroundImage = data.backgroundGradient;\n\t\tif( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );\n\n\t\tif( dataPreload ) element.setAttribute( 'data-preload', '' );\n\n\t\t// Background image options are set on the content wrapper\n\t\tif( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;\n\t\tif( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;\n\t\tif( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;\n\t\tif( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;\n\n\t\t// If this slide has a background color, we add a class that\n\t\t// signals if it is light or dark. If the slide has no background\n\t\t// color, no class will be added\n\t\tlet contrastColor = data.backgroundColor;\n\n\t\t// If no bg color was found, or it cannot be converted by colorToRgb, check the computed background\n\t\tif( !contrastColor || !colorToRgb( contrastColor ) ) {\n\t\t\tlet computedBackgroundStyle = window.getComputedStyle( element );\n\t\t\tif( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {\n\t\t\t\tcontrastColor = computedBackgroundStyle.backgroundColor;\n\t\t\t}\n\t\t}\n\n\t\tif( contrastColor ) {\n\t\t\tconst rgb = colorToRgb( contrastColor );\n\n\t\t\t// Ignore fully transparent backgrounds. Some browsers return\n\t\t\t// rgba(0,0,0,0) when reading the computed background color of\n\t\t\t// an element with no background\n\t\t\tif( rgb && rgb.a !== 0 ) {\n\t\t\t\tif( colorBrightness( contrastColor ) < 128 ) {\n\t\t\t\t\tslide.classList.add( 'has-dark-background' );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tslide.classList.add( 'has-light-background' );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the background elements to reflect the current\n\t * slide.\n\t *\n\t * @param {boolean} includeAll If true, the backgrounds of\n\t * all vertical slides (not just the present) will be updated.\n\t */\n\tupdate( includeAll = false ) {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tlet indices = this.Reveal.getIndices();\n\n\t\tlet currentBackground = null;\n\n\t\t// Reverse past/future classes when in RTL mode\n\t\tlet horizontalPast = this.Reveal.getConfig().rtl ? 'future' : 'past',\n\t\t\thorizontalFuture = this.Reveal.getConfig().rtl ? 'past' : 'future';\n\n\t\t// Update the classes of all backgrounds to match the\n\t\t// states of their slides (past/present/future)\n\t\tArray.from( this.element.childNodes ).forEach( ( backgroundh, h ) => {\n\n\t\t\tbackgroundh.classList.remove( 'past', 'present', 'future' );\n\n\t\t\tif( h < indices.h ) {\n\t\t\t\tbackgroundh.classList.add( horizontalPast );\n\t\t\t}\n\t\t\telse if ( h > indices.h ) {\n\t\t\t\tbackgroundh.classList.add( horizontalFuture );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbackgroundh.classList.add( 'present' );\n\n\t\t\t\t// Store a reference to the current background element\n\t\t\t\tcurrentBackground = backgroundh;\n\t\t\t}\n\n\t\t\tif( includeAll || h === indices.h ) {\n\t\t\t\tqueryAll( backgroundh, '.slide-background' ).forEach( ( backgroundv, v ) => {\n\n\t\t\t\t\tbackgroundv.classList.remove( 'past', 'present', 'future' );\n\n\t\t\t\t\tif( v < indices.v ) {\n\t\t\t\t\t\tbackgroundv.classList.add( 'past' );\n\t\t\t\t\t}\n\t\t\t\t\telse if ( v > indices.v ) {\n\t\t\t\t\t\tbackgroundv.classList.add( 'future' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tbackgroundv.classList.add( 'present' );\n\n\t\t\t\t\t\t// Only if this is the present horizontal and vertical slide\n\t\t\t\t\t\tif( h === indices.h ) currentBackground = backgroundv;\n\t\t\t\t\t}\n\n\t\t\t\t} );\n\t\t\t}\n\n\t\t} );\n\n\t\t// Stop content inside of previous backgrounds\n\t\tif( this.previousBackground ) {\n\n\t\t\tthis.Reveal.slideContent.stopEmbeddedContent( this.previousBackground, { unloadIframes: !this.Reveal.slideContent.shouldPreload( this.previousBackground ) } );\n\n\t\t}\n\n\t\t// Start content in the current background\n\t\tif( currentBackground ) {\n\n\t\t\tthis.Reveal.slideContent.startEmbeddedContent( currentBackground );\n\n\t\t\tlet currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );\n\t\t\tif( currentBackgroundContent ) {\n\n\t\t\t\tlet backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';\n\n\t\t\t\t// Restart GIFs (doesn't work in Firefox)\n\t\t\t\tif( /\\.gif/i.test( backgroundImageURL ) ) {\n\t\t\t\t\tcurrentBackgroundContent.style.backgroundImage = '';\n\t\t\t\t\twindow.getComputedStyle( currentBackgroundContent ).opacity;\n\t\t\t\t\tcurrentBackgroundContent.style.backgroundImage = backgroundImageURL;\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\t// Don't transition between identical backgrounds. This\n\t\t\t// prevents unwanted flicker.\n\t\t\tlet previousBackgroundHash = this.previousBackground ? this.previousBackground.getAttribute( 'data-background-hash' ) : null;\n\t\t\tlet currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );\n\t\t\tif( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== this.previousBackground ) {\n\t\t\t\tthis.element.classList.add( 'no-transition' );\n\t\t\t}\n\n\t\t\tthis.previousBackground = currentBackground;\n\n\t\t}\n\n\t\t// If there's a background brightness flag for this slide,\n\t\t// bubble it to the .reveal container\n\t\tif( currentSlide ) {\n\t\t\t[ 'has-light-background', 'has-dark-background' ].forEach( classToBubble => {\n\t\t\t\tif( currentSlide.classList.contains( classToBubble ) ) {\n\t\t\t\t\tthis.Reveal.getRevealElement().classList.add( classToBubble );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.getRevealElement().classList.remove( classToBubble );\n\t\t\t\t}\n\t\t\t}, this );\n\t\t}\n\n\t\t// Allow the first background to apply without transition\n\t\tsetTimeout( () => {\n\t\t\tthis.element.classList.remove( 'no-transition' );\n\t\t}, 1 );\n\n\t}\n\n\t/**\n\t * Updates the position of the parallax background based\n\t * on the current slide index.\n\t */\n\tupdateParallax() {\n\n\t\tlet indices = this.Reveal.getIndices();\n\n\t\tif( this.Reveal.getConfig().parallaxBackgroundImage ) {\n\n\t\t\tlet horizontalSlides = this.Reveal.getHorizontalSlides(),\n\t\t\t\tverticalSlides = this.Reveal.getVerticalSlides();\n\n\t\t\tlet backgroundSize = this.element.style.backgroundSize.split( ' ' ),\n\t\t\t\tbackgroundWidth, backgroundHeight;\n\n\t\t\tif( backgroundSize.length === 1 ) {\n\t\t\t\tbackgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbackgroundWidth = parseInt( backgroundSize[0], 10 );\n\t\t\t\tbackgroundHeight = parseInt( backgroundSize[1], 10 );\n\t\t\t}\n\n\t\t\tlet slideWidth = this.element.offsetWidth,\n\t\t\t\thorizontalSlideCount = horizontalSlides.length,\n\t\t\t\thorizontalOffsetMultiplier,\n\t\t\t\thorizontalOffset;\n\n\t\t\tif( typeof this.Reveal.getConfig().parallaxBackgroundHorizontal === 'number' ) {\n\t\t\t\thorizontalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundHorizontal;\n\t\t\t}\n\t\t\telse {\n\t\t\t\thorizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;\n\t\t\t}\n\n\t\t\thorizontalOffset = horizontalOffsetMultiplier * indices.h * -1;\n\n\t\t\tlet slideHeight = this.element.offsetHeight,\n\t\t\t\tverticalSlideCount = verticalSlides.length,\n\t\t\t\tverticalOffsetMultiplier,\n\t\t\t\tverticalOffset;\n\n\t\t\tif( typeof this.Reveal.getConfig().parallaxBackgroundVertical === 'number' ) {\n\t\t\t\tverticalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundVertical;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tverticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );\n\t\t\t}\n\n\t\t\tverticalOffset = verticalSlideCount > 0 ?  verticalOffsetMultiplier * indices.v : 0;\n\n\t\t\tthis.element.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';\n\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}\n","\nexport const SLIDES_SELECTOR = '.slides section';\nexport const HORIZONTAL_SLIDES_SELECTOR = '.slides>section';\nexport const VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section';\n\n// Methods that may not be invoked via the postMessage API\nexport const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener|showPreview/;\n\n// Regex for retrieving the fragment style from a class attribute\nexport const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;","import { queryAll, extend, createStyleSheet, matches, closest } from '../utils/util.js'\nimport { FRAGMENT_STYLE_REGEX } from '../utils/constants.js'\n\n// Counter used to generate unique IDs for auto-animated elements\nlet autoAnimateCounter = 0;\n\n/**\n * Automatically animates matching elements across\n * slides with the [data-auto-animate] attribute.\n */\nexport default class AutoAnimate {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Runs an auto-animation between the given slides.\n\t *\n\t * @param  {HTMLElement} fromSlide\n\t * @param  {HTMLElement} toSlide\n\t */\n\trun( fromSlide, toSlide ) {\n\n\t\t// Clean up after prior animations\n\t\tthis.reset();\n\n\t\tlet allSlides = this.Reveal.getSlides();\n\t\tlet toSlideIndex = allSlides.indexOf( toSlide );\n\t\tlet fromSlideIndex = allSlides.indexOf( fromSlide );\n\n\t\t// Ensure that both slides are auto-animate targets with the same data-auto-animate-id value\n\t\t// (including null if absent on both) and that data-auto-animate-restart isn't set on the\n\t\t// physically latter slide (independent of slide direction)\n\t\tif( fromSlide.hasAttribute( 'data-auto-animate' ) && toSlide.hasAttribute( 'data-auto-animate' )\n\t\t\t\t&& fromSlide.getAttribute( 'data-auto-animate-id' ) === toSlide.getAttribute( 'data-auto-animate-id' ) \n\t\t\t\t&& !( toSlideIndex > fromSlideIndex ? toSlide : fromSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {\n\n\t\t\t// Create a new auto-animate sheet\n\t\t\tthis.autoAnimateStyleSheet = this.autoAnimateStyleSheet || createStyleSheet();\n\n\t\t\tlet animationOptions = this.getAutoAnimateOptions( toSlide );\n\n\t\t\t// Set our starting state\n\t\t\tfromSlide.dataset.autoAnimate = 'pending';\n\t\t\ttoSlide.dataset.autoAnimate = 'pending';\n\n\t\t\t// Flag the navigation direction, needed for fragment buildup\n\t\t\tanimationOptions.slideDirection = toSlideIndex > fromSlideIndex ? 'forward' : 'backward';\n\n\t\t\t// If the from-slide is hidden because it has moved outside\n\t\t\t// the view distance, we need to temporarily show it while\n\t\t\t// measuring\n\t\t\tlet fromSlideIsHidden = fromSlide.style.display === 'none';\n\t\t\tif( fromSlideIsHidden ) fromSlide.style.display = this.Reveal.getConfig().display;\n\n\t\t\t// Inject our auto-animate styles for this transition\n\t\t\tlet css = this.getAutoAnimatableElements( fromSlide, toSlide ).map( elements => {\n\t\t\t\treturn this.autoAnimateElements( elements.from, elements.to, elements.options || {}, animationOptions, autoAnimateCounter++ );\n\t\t\t} );\n\n\t\t\tif( fromSlideIsHidden ) fromSlide.style.display = 'none';\n\n\t\t\t// Animate unmatched elements, if enabled\n\t\t\tif( toSlide.dataset.autoAnimateUnmatched !== 'false' && this.Reveal.getConfig().autoAnimateUnmatched === true ) {\n\n\t\t\t\t// Our default timings for unmatched elements\n\t\t\t\tlet defaultUnmatchedDuration = animationOptions.duration * 0.8,\n\t\t\t\t\tdefaultUnmatchedDelay = animationOptions.duration * 0.2;\n\n\t\t\t\tthis.getUnmatchedAutoAnimateElements( toSlide ).forEach( unmatchedElement => {\n\n\t\t\t\t\tlet unmatchedOptions = this.getAutoAnimateOptions( unmatchedElement, animationOptions );\n\t\t\t\t\tlet id = 'unmatched';\n\n\t\t\t\t\t// If there is a duration or delay set specifically for this\n\t\t\t\t\t// element our unmatched elements should adhere to those\n\t\t\t\t\tif( unmatchedOptions.duration !== animationOptions.duration || unmatchedOptions.delay !== animationOptions.delay ) {\n\t\t\t\t\t\tid = 'unmatched-' + autoAnimateCounter++;\n\t\t\t\t\t\tcss.push( `[data-auto-animate=\"running\"] [data-auto-animate-target=\"${id}\"] { transition: opacity ${unmatchedOptions.duration}s ease ${unmatchedOptions.delay}s; }` );\n\t\t\t\t\t}\n\n\t\t\t\t\tunmatchedElement.dataset.autoAnimateTarget = id;\n\n\t\t\t\t}, this );\n\n\t\t\t\t// Our default transition for unmatched elements\n\t\t\t\tcss.push( `[data-auto-animate=\"running\"] [data-auto-animate-target=\"unmatched\"] { transition: opacity ${defaultUnmatchedDuration}s ease ${defaultUnmatchedDelay}s; }` );\n\n\t\t\t}\n\n\t\t\t// Setting the whole chunk of CSS at once is the most\n\t\t\t// efficient way to do this. Using sheet.insertRule\n\t\t\t// is multiple factors slower.\n\t\t\tthis.autoAnimateStyleSheet.innerHTML = css.join( '' );\n\n\t\t\t// Start the animation next cycle\n\t\t\trequestAnimationFrame( () => {\n\t\t\t\tif( this.autoAnimateStyleSheet ) {\n\t\t\t\t\t// This forces our newly injected styles to be applied in Firefox\n\t\t\t\t\tgetComputedStyle( this.autoAnimateStyleSheet ).fontWeight;\n\n\t\t\t\t\ttoSlide.dataset.autoAnimate = 'running';\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'autoanimate',\n\t\t\t\tdata: {\n\t\t\t\t\tfromSlide,\n\t\t\t\t\ttoSlide,\n\t\t\t\t\tsheet: this.autoAnimateStyleSheet\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Rolls back all changes that we've made to the DOM so\n\t * that as part of animating.\n\t */\n\treset() {\n\n\t\t// Reset slides\n\t\tqueryAll( this.Reveal.getRevealElement(), '[data-auto-animate]:not([data-auto-animate=\"\"])' ).forEach( element => {\n\t\t\telement.dataset.autoAnimate = '';\n\t\t} );\n\n\t\t// Reset elements\n\t\tqueryAll( this.Reveal.getRevealElement(), '[data-auto-animate-target]' ).forEach( element => {\n\t\t\tdelete element.dataset.autoAnimateTarget;\n\t\t} );\n\n\t\t// Remove the animation sheet\n\t\tif( this.autoAnimateStyleSheet && this.autoAnimateStyleSheet.parentNode ) {\n\t\t\tthis.autoAnimateStyleSheet.parentNode.removeChild( this.autoAnimateStyleSheet );\n\t\t\tthis.autoAnimateStyleSheet = null;\n\t\t}\n\n\t}\n\n\t/**\n\t * Creates a FLIP animation where the `to` element starts out\n\t * in the `from` element position and animates to its original\n\t * state.\n\t *\n\t * @param {HTMLElement} from\n\t * @param {HTMLElement} to\n\t * @param {Object} elementOptions Options for this element pair\n\t * @param {Object} animationOptions Options set at the slide level\n\t * @param {String} id Unique ID that we can use to identify this\n\t * auto-animate element in the DOM\n\t */\n\tautoAnimateElements( from, to, elementOptions, animationOptions, id ) {\n\n\t\t// 'from' elements are given a data-auto-animate-target with no value,\n\t\t// 'to' elements are are given a data-auto-animate-target with an ID\n\t\tfrom.dataset.autoAnimateTarget = '';\n\t\tto.dataset.autoAnimateTarget = id;\n\n\t\t// Each element may override any of the auto-animate options\n\t\t// like transition easing, duration and delay via data-attributes\n\t\tlet options = this.getAutoAnimateOptions( to, animationOptions );\n\n\t\t// If we're using a custom element matcher the element options\n\t\t// may contain additional transition overrides\n\t\tif( typeof elementOptions.delay !== 'undefined' ) options.delay = elementOptions.delay;\n\t\tif( typeof elementOptions.duration !== 'undefined' ) options.duration = elementOptions.duration;\n\t\tif( typeof elementOptions.easing !== 'undefined' ) options.easing = elementOptions.easing;\n\n\t\tlet fromProps = this.getAutoAnimatableProperties( 'from', from, elementOptions ),\n\t\t\ttoProps = this.getAutoAnimatableProperties( 'to', to, elementOptions );\n\n\t\t// Maintain fragment visibility for matching elements when\n\t\t// we're navigating forwards, this way the viewer won't need\n\t\t// to step through the same fragments twice\n\t\tif( to.classList.contains( 'fragment' ) ) {\n\n\t\t\t// Don't auto-animate the opacity of fragments to avoid\n\t\t\t// conflicts with fragment animations\n\t\t\tdelete toProps.styles['opacity'];\n\n\t\t\tif( from.classList.contains( 'fragment' ) ) {\n\n\t\t\t\tlet fromFragmentStyle = ( from.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];\n\t\t\t\tlet toFragmentStyle = ( to.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];\n\n\t\t\t\t// Only skip the fragment if the fragment animation style\n\t\t\t\t// remains unchanged\n\t\t\t\tif( fromFragmentStyle === toFragmentStyle && animationOptions.slideDirection === 'forward' ) {\n\t\t\t\t\tto.classList.add( 'visible', 'disabled' );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t// If translation and/or scaling are enabled, css transform\n\t\t// the 'to' element so that it matches the position and size\n\t\t// of the 'from' element\n\t\tif( elementOptions.translate !== false || elementOptions.scale !== false ) {\n\n\t\t\tlet presentationScale = this.Reveal.getScale();\n\n\t\t\tlet delta = {\n\t\t\t\tx: ( fromProps.x - toProps.x ) / presentationScale,\n\t\t\t\ty: ( fromProps.y - toProps.y ) / presentationScale,\n\t\t\t\tscaleX: fromProps.width / toProps.width,\n\t\t\t\tscaleY: fromProps.height / toProps.height\n\t\t\t};\n\n\t\t\t// Limit decimal points to avoid 0.0001px blur and stutter\n\t\t\tdelta.x = Math.round( delta.x * 1000 ) / 1000;\n\t\t\tdelta.y = Math.round( delta.y * 1000 ) / 1000;\n\t\t\tdelta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;\n\t\t\tdelta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;\n\n\t\t\tlet translate = elementOptions.translate !== false && ( delta.x !== 0 || delta.y !== 0 ),\n\t\t\t\tscale = elementOptions.scale !== false && ( delta.scaleX !== 0 || delta.scaleY !== 0 );\n\n\t\t\t// No need to transform if nothing's changed\n\t\t\tif( translate || scale ) {\n\n\t\t\t\tlet transform = [];\n\n\t\t\t\tif( translate ) transform.push( `translate(${delta.x}px, ${delta.y}px)` );\n\t\t\t\tif( scale ) transform.push( `scale(${delta.scaleX}, ${delta.scaleY})` );\n\n\t\t\t\tfromProps.styles['transform'] = transform.join( ' ' );\n\t\t\t\tfromProps.styles['transform-origin'] = 'top left';\n\n\t\t\t\ttoProps.styles['transform'] = 'none';\n\n\t\t\t}\n\n\t\t}\n\n\t\t// Delete all unchanged 'to' styles\n\t\tfor( let propertyName in toProps.styles ) {\n\t\t\tconst toValue = toProps.styles[propertyName];\n\t\t\tconst fromValue = fromProps.styles[propertyName];\n\n\t\t\tif( toValue === fromValue ) {\n\t\t\t\tdelete toProps.styles[propertyName];\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// If these property values were set via a custom matcher providing\n\t\t\t\t// an explicit 'from' and/or 'to' value, we always inject those values.\n\t\t\t\tif( toValue.explicitValue === true ) {\n\t\t\t\t\ttoProps.styles[propertyName] = toValue.value;\n\t\t\t\t}\n\n\t\t\t\tif( fromValue.explicitValue === true ) {\n\t\t\t\t\tfromProps.styles[propertyName] = fromValue.value;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tlet css = '';\n\n\t\tlet toStyleProperties = Object.keys( toProps.styles );\n\n\t\t// Only create animate this element IF at least one style\n\t\t// property has changed\n\t\tif( toStyleProperties.length > 0 ) {\n\n\t\t\t// Instantly move to the 'from' state\n\t\t\tfromProps.styles['transition'] = 'none';\n\n\t\t\t// Animate towards the 'to' state\n\t\t\ttoProps.styles['transition'] = `all ${options.duration}s ${options.easing} ${options.delay}s`;\n\t\t\ttoProps.styles['transition-property'] = toStyleProperties.join( ', ' );\n\t\t\ttoProps.styles['will-change'] = toStyleProperties.join( ', ' );\n\n\t\t\t// Build up our custom CSS. We need to override inline styles\n\t\t\t// so we need to make our styles vErY IMPORTANT!1!!\n\t\t\tlet fromCSS = Object.keys( fromProps.styles ).map( propertyName => {\n\t\t\t\treturn propertyName + ': ' + fromProps.styles[propertyName] + ' !important;';\n\t\t\t} ).join( '' );\n\n\t\t\tlet toCSS = Object.keys( toProps.styles ).map( propertyName => {\n\t\t\t\treturn propertyName + ': ' + toProps.styles[propertyName] + ' !important;';\n\t\t\t} ).join( '' );\n\n\t\t\tcss = \t'[data-auto-animate-target=\"'+ id +'\"] {'+ fromCSS +'}' +\n\t\t\t\t\t'[data-auto-animate=\"running\"] [data-auto-animate-target=\"'+ id +'\"] {'+ toCSS +'}';\n\n\t\t}\n\n\t\treturn css;\n\n\t}\n\n\t/**\n\t * Returns the auto-animate options for the given element.\n\t *\n\t * @param {HTMLElement} element Element to pick up options\n\t * from, either a slide or an animation target\n\t * @param {Object} [inheritedOptions] Optional set of existing\n\t * options\n\t */\n\tgetAutoAnimateOptions( element, inheritedOptions ) {\n\n\t\tlet options = {\n\t\t\teasing: this.Reveal.getConfig().autoAnimateEasing,\n\t\t\tduration: this.Reveal.getConfig().autoAnimateDuration,\n\t\t\tdelay: 0\n\t\t};\n\n\t\toptions = extend( options, inheritedOptions );\n\n\t\t// Inherit options from parent elements\n\t\tif( element.parentNode ) {\n\t\t\tlet autoAnimatedParent = closest( element.parentNode, '[data-auto-animate-target]' );\n\t\t\tif( autoAnimatedParent ) {\n\t\t\t\toptions = this.getAutoAnimateOptions( autoAnimatedParent, options );\n\t\t\t}\n\t\t}\n\n\t\tif( element.dataset.autoAnimateEasing ) {\n\t\t\toptions.easing = element.dataset.autoAnimateEasing;\n\t\t}\n\n\t\tif( element.dataset.autoAnimateDuration ) {\n\t\t\toptions.duration = parseFloat( element.dataset.autoAnimateDuration );\n\t\t}\n\n\t\tif( element.dataset.autoAnimateDelay ) {\n\t\t\toptions.delay = parseFloat( element.dataset.autoAnimateDelay );\n\t\t}\n\n\t\treturn options;\n\n\t}\n\n\t/**\n\t * Returns an object containing all of the properties\n\t * that can be auto-animated for the given element and\n\t * their current computed values.\n\t *\n\t * @param {String} direction 'from' or 'to'\n\t */\n\tgetAutoAnimatableProperties( direction, element, elementOptions ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\tlet properties = { styles: [] };\n\n\t\t// Position and size\n\t\tif( elementOptions.translate !== false || elementOptions.scale !== false ) {\n\t\t\tlet bounds;\n\n\t\t\t// Custom auto-animate may optionally return a custom tailored\n\t\t\t// measurement function\n\t\t\tif( typeof elementOptions.measure === 'function' ) {\n\t\t\t\tbounds = elementOptions.measure( element );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif( config.center ) {\n\t\t\t\t\t// More precise, but breaks when used in combination\n\t\t\t\t\t// with zoom for scaling the deck ¯\\_(ツ)_/¯\n\t\t\t\t\tbounds = element.getBoundingClientRect();\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tlet scale = this.Reveal.getScale();\n\t\t\t\t\tbounds = {\n\t\t\t\t\t\tx: element.offsetLeft * scale,\n\t\t\t\t\t\ty: element.offsetTop * scale,\n\t\t\t\t\t\twidth: element.offsetWidth * scale,\n\t\t\t\t\t\theight: element.offsetHeight * scale\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tproperties.x = bounds.x;\n\t\t\tproperties.y = bounds.y;\n\t\t\tproperties.width = bounds.width;\n\t\t\tproperties.height = bounds.height;\n\t\t}\n\n\t\tconst computedStyles = getComputedStyle( element );\n\n\t\t// CSS styles\n\t\t( elementOptions.styles || config.autoAnimateStyles ).forEach( style => {\n\t\t\tlet value;\n\n\t\t\t// `style` is either the property name directly, or an object\n\t\t\t// definition of a style property\n\t\t\tif( typeof style === 'string' ) style = { property: style };\n\n\t\t\tif( typeof style.from !== 'undefined' && direction === 'from' ) {\n\t\t\t\tvalue = { value: style.from, explicitValue: true };\n\t\t\t}\n\t\t\telse if( typeof style.to !== 'undefined' && direction === 'to' ) {\n\t\t\t\tvalue = { value: style.to, explicitValue: true };\n\t\t\t}\n\t\t\telse {\n\t\t\t\tvalue = computedStyles[style.property];\n\t\t\t}\n\n\t\t\tif( value !== '' ) {\n\t\t\t\tproperties.styles[style.property] = value;\n\t\t\t}\n\t\t} );\n\n\t\treturn properties;\n\n\t}\n\n\t/**\n\t * Get a list of all element pairs that we can animate\n\t * between the given slides.\n\t *\n\t * @param {HTMLElement} fromSlide\n\t * @param {HTMLElement} toSlide\n\t *\n\t * @return {Array} Each value is an array where [0] is\n\t * the element we're animating from and [1] is the\n\t * element we're animating to\n\t */\n\tgetAutoAnimatableElements( fromSlide, toSlide ) {\n\n\t\tlet matcher = typeof this.Reveal.getConfig().autoAnimateMatcher === 'function' ? this.Reveal.getConfig().autoAnimateMatcher : this.getAutoAnimatePairs;\n\n\t\tlet pairs = matcher.call( this, fromSlide, toSlide );\n\n\t\tlet reserved = [];\n\n\t\t// Remove duplicate pairs\n\t\treturn pairs.filter( ( pair, index ) => {\n\t\t\tif( reserved.indexOf( pair.to ) === -1 ) {\n\t\t\t\treserved.push( pair.to );\n\t\t\t\treturn true;\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Identifies matching elements between slides.\n\t *\n\t * You can specify a custom matcher function by using\n\t * the `autoAnimateMatcher` config option.\n\t */\n\tgetAutoAnimatePairs( fromSlide, toSlide ) {\n\n\t\tlet pairs = [];\n\n\t\tconst codeNodes = 'pre';\n\t\tconst textNodes = 'h1, h2, h3, h4, h5, h6, p, li';\n\t\tconst mediaNodes = 'img, video, iframe';\n\n\t\t// Eplicit matches via data-id\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', node => {\n\t\t\treturn node.nodeName + ':::' + node.getAttribute( 'data-id' );\n\t\t} );\n\n\t\t// Text\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, textNodes, node => {\n\t\t\treturn node.nodeName + ':::' + node.innerText;\n\t\t} );\n\n\t\t// Media\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, mediaNodes, node => {\n\t\t\treturn node.nodeName + ':::' + ( node.getAttribute( 'src' ) || node.getAttribute( 'data-src' ) );\n\t\t} );\n\n\t\t// Code\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, codeNodes, node => {\n\t\t\treturn node.nodeName + ':::' + node.innerText;\n\t\t} );\n\n\t\tpairs.forEach( pair => {\n\n\t\t\t// Disable scale transformations on text nodes, we transition\n\t\t\t// each individual text property instead\n\t\t\tif( matches( pair.from, textNodes ) ) {\n\t\t\t\tpair.options = { scale: false };\n\t\t\t}\n\t\t\t// Animate individual lines of code\n\t\t\telse if( matches( pair.from, codeNodes ) ) {\n\n\t\t\t\t// Transition the code block's width and height instead of scaling\n\t\t\t\t// to prevent its content from being squished\n\t\t\t\tpair.options = { scale: false, styles: [ 'width', 'height' ] };\n\n\t\t\t\t// Lines of code\n\t\t\t\tthis.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-code', node => {\n\t\t\t\t\treturn node.textContent;\n\t\t\t\t}, {\n\t\t\t\t\tscale: false,\n\t\t\t\t\tstyles: [],\n\t\t\t\t\tmeasure: this.getLocalBoundingBox.bind( this )\n\t\t\t\t} );\n\n\t\t\t\t// Line numbers\n\t\t\t\tthis.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-line[data-line-number]', node => {\n\t\t\t\t\treturn node.getAttribute( 'data-line-number' );\n\t\t\t\t}, {\n\t\t\t\t\tscale: false,\n\t\t\t\t\tstyles: [ 'width' ],\n\t\t\t\t\tmeasure: this.getLocalBoundingBox.bind( this )\n\t\t\t\t} );\n\n\t\t\t}\n\n\t\t}, this );\n\n\t\treturn pairs;\n\n\t}\n\n\t/**\n\t * Helper method which returns a bounding box based on\n\t * the given elements offset coordinates.\n\t *\n\t * @param {HTMLElement} element\n\t * @return {Object} x, y, width, height\n\t */\n\tgetLocalBoundingBox( element ) {\n\n\t\tconst presentationScale = this.Reveal.getScale();\n\n\t\treturn {\n\t\t\tx: Math.round( ( element.offsetLeft * presentationScale ) * 100 ) / 100,\n\t\t\ty: Math.round( ( element.offsetTop * presentationScale ) * 100 ) / 100,\n\t\t\twidth: Math.round( ( element.offsetWidth * presentationScale ) * 100 ) / 100,\n\t\t\theight: Math.round( ( element.offsetHeight * presentationScale ) * 100 ) / 100\n\t\t};\n\n\t}\n\n\t/**\n\t * Finds matching elements between two slides.\n\t *\n\t * @param {Array} pairs            \tList of pairs to push matches to\n\t * @param {HTMLElement} fromScope   Scope within the from element exists\n\t * @param {HTMLElement} toScope     Scope within the to element exists\n\t * @param {String} selector         CSS selector of the element to match\n\t * @param {Function} serializer     A function that accepts an element and returns\n\t *                                  a stringified ID based on its contents\n\t * @param {Object} animationOptions Optional config options for this pair\n\t */\n\tfindAutoAnimateMatches( pairs, fromScope, toScope, selector, serializer, animationOptions ) {\n\n\t\tlet fromMatches = {};\n\t\tlet toMatches = {};\n\n\t\t[].slice.call( fromScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {\n\t\t\tconst key = serializer( element );\n\t\t\tif( typeof key === 'string' && key.length ) {\n\t\t\t\tfromMatches[key] = fromMatches[key] || [];\n\t\t\t\tfromMatches[key].push( element );\n\t\t\t}\n\t\t} );\n\n\t\t[].slice.call( toScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {\n\t\t\tconst key = serializer( element );\n\t\t\ttoMatches[key] = toMatches[key] || [];\n\t\t\ttoMatches[key].push( element );\n\n\t\t\tlet fromElement;\n\n\t\t\t// Retrieve the 'from' element\n\t\t\tif( fromMatches[key] ) {\n\t\t\t\tconst pimaryIndex = toMatches[key].length - 1;\n\t\t\t\tconst secondaryIndex = fromMatches[key].length - 1;\n\n\t\t\t\t// If there are multiple identical from elements, retrieve\n\t\t\t\t// the one at the same index as our to-element.\n\t\t\t\tif( fromMatches[key][ pimaryIndex ] ) {\n\t\t\t\t\tfromElement = fromMatches[key][ pimaryIndex ];\n\t\t\t\t\tfromMatches[key][ pimaryIndex ] = null;\n\t\t\t\t}\n\t\t\t\t// If there are no matching from-elements at the same index,\n\t\t\t\t// use the last one.\n\t\t\t\telse if( fromMatches[key][ secondaryIndex ] ) {\n\t\t\t\t\tfromElement = fromMatches[key][ secondaryIndex ];\n\t\t\t\t\tfromMatches[key][ secondaryIndex ] = null;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If we've got a matching pair, push it to the list of pairs\n\t\t\tif( fromElement ) {\n\t\t\t\tpairs.push({\n\t\t\t\t\tfrom: fromElement,\n\t\t\t\t\tto: element,\n\t\t\t\t\toptions: animationOptions\n\t\t\t\t});\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Returns a all elements within the given scope that should\n\t * be considered unmatched in an auto-animate transition. If\n\t * fading of unmatched elements is turned on, these elements\n\t * will fade when going between auto-animate slides.\n\t *\n\t * Note that parents of auto-animate targets are NOT considerd\n\t * unmatched since fading them would break the auto-animation.\n\t *\n\t * @param {HTMLElement} rootElement\n\t * @return {Array}\n\t */\n\tgetUnmatchedAutoAnimateElements( rootElement ) {\n\n\t\treturn [].slice.call( rootElement.children ).reduce( ( result, element ) => {\n\n\t\t\tconst containsAnimatedElements = element.querySelector( '[data-auto-animate-target]' );\n\n\t\t\t// The element is unmatched if\n\t\t\t// - It is not an auto-animate target\n\t\t\t// - It does not contain any auto-animate targets\n\t\t\tif( !element.hasAttribute( 'data-auto-animate-target' ) && !containsAnimatedElements ) {\n\t\t\t\tresult.push( element );\n\t\t\t}\n\n\t\t\tif( element.querySelector( '[data-auto-animate-target]' ) ) {\n\t\t\t\tresult = result.concat( this.getUnmatchedAutoAnimateElements( element ) );\n\t\t\t}\n\n\t\t\treturn result;\n\n\t\t}, [] );\n\n\t}\n\n}\n","import { extend, queryAll } from '../utils/util.js'\n\n/**\n * Handles sorting and navigation of slide fragments.\n * Fragments are elements within a slide that are\n * revealed/animated incrementally.\n */\nexport default class Fragments {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.fragments === false ) {\n\t\t\tthis.disable();\n\t\t}\n\t\telse if( oldConfig.fragments === false ) {\n\t\t\tthis.enable();\n\t\t}\n\n\t}\n\n\t/**\n\t * If fragments are disabled in the deck, they should all be\n\t * visible rather than stepped through.\n\t */\n\tdisable() {\n\n\t\tqueryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {\n\t\t\telement.classList.add( 'visible' );\n\t\t\telement.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Reverse of #disable(). Only called if fragments have\n\t * previously been disabled.\n\t */\n\tenable() {\n\n\t\tqueryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {\n\t\t\telement.classList.remove( 'visible' );\n\t\t\telement.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Returns an object describing the available fragment\n\t * directions.\n\t *\n\t * @return {{prev: boolean, next: boolean}}\n\t */\n\tavailableRoutes() {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\t\t\tlet fragments = currentSlide.querySelectorAll( '.fragment:not(.disabled)' );\n\t\t\tlet hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.disabled):not(.visible)' );\n\n\t\t\treturn {\n\t\t\t\tprev: fragments.length - hiddenFragments.length > 0,\n\t\t\t\tnext: !!hiddenFragments.length\n\t\t\t};\n\t\t}\n\t\telse {\n\t\t\treturn { prev: false, next: false };\n\t\t}\n\n\t}\n\n\t/**\n\t * Return a sorted fragments list, ordered by an increasing\n\t * \"data-fragment-index\" attribute.\n\t *\n\t * Fragments will be revealed in the order that they are returned by\n\t * this function, so you can use the index attributes to control the\n\t * order of fragment appearance.\n\t *\n\t * To maintain a sensible default fragment order, fragments are presumed\n\t * to be passed in document order. This function adds a \"fragment-index\"\n\t * attribute to each node if such an attribute is not already present,\n\t * and sets that attribute to an integer value which is the position of\n\t * the fragment within the fragments list.\n\t *\n\t * @param {object[]|*} fragments\n\t * @param {boolean} grouped If true the returned array will contain\n\t * nested arrays for all fragments with the same index\n\t * @return {object[]} sorted Sorted array of fragments\n\t */\n\tsort( fragments, grouped = false ) {\n\n\t\tfragments = Array.from( fragments );\n\n\t\tlet ordered = [],\n\t\t\tunordered = [],\n\t\t\tsorted = [];\n\n\t\t// Group ordered and unordered elements\n\t\tfragments.forEach( fragment => {\n\t\t\tif( fragment.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\tlet index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );\n\n\t\t\t\tif( !ordered[index] ) {\n\t\t\t\t\tordered[index] = [];\n\t\t\t\t}\n\n\t\t\t\tordered[index].push( fragment );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tunordered.push( [ fragment ] );\n\t\t\t}\n\t\t} );\n\n\t\t// Append fragments without explicit indices in their\n\t\t// DOM order\n\t\tordered = ordered.concat( unordered );\n\n\t\t// Manually count the index up per group to ensure there\n\t\t// are no gaps\n\t\tlet index = 0;\n\n\t\t// Push all fragments in their sorted order to an array,\n\t\t// this flattens the groups\n\t\tordered.forEach( group => {\n\t\t\tgroup.forEach( fragment => {\n\t\t\t\tsorted.push( fragment );\n\t\t\t\tfragment.setAttribute( 'data-fragment-index', index );\n\t\t\t} );\n\n\t\t\tindex ++;\n\t\t} );\n\n\t\treturn grouped === true ? ordered : sorted;\n\n\t}\n\n\t/**\n\t * Sorts and formats all of fragments in the\n\t * presentation.\n\t */\n\tsortAll() {\n\n\t\tthis.Reveal.getHorizontalSlides().forEach( horizontalSlide => {\n\n\t\t\tlet verticalSlides = queryAll( horizontalSlide, 'section' );\n\t\t\tverticalSlides.forEach( ( verticalSlide, y ) => {\n\n\t\t\t\tthis.sort( verticalSlide.querySelectorAll( '.fragment' ) );\n\n\t\t\t}, this );\n\n\t\t\tif( verticalSlides.length === 0 ) this.sort( horizontalSlide.querySelectorAll( '.fragment' ) );\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Refreshes the fragments on the current slide so that they\n\t * have the appropriate classes (.visible + .current-fragment).\n\t *\n\t * @param {number} [index] The index of the current fragment\n\t * @param {array} [fragments] Array containing all fragments\n\t * in the current slide\n\t *\n\t * @return {{shown: array, hidden: array}}\n\t */\n\tupdate( index, fragments ) {\n\n\t\tlet changedFragments = {\n\t\t\tshown: [],\n\t\t\thidden: []\n\t\t};\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\n\t\t\tfragments = fragments || this.sort( currentSlide.querySelectorAll( '.fragment' ) );\n\n\t\t\tif( fragments.length ) {\n\n\t\t\t\tlet maxIndex = 0;\n\n\t\t\t\tif( typeof index !== 'number' ) {\n\t\t\t\t\tlet currentFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();\n\t\t\t\t\tif( currentFragment ) {\n\t\t\t\t\t\tindex = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tArray.from( fragments ).forEach( ( el, i ) => {\n\n\t\t\t\t\tif( el.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\t\t\ti = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );\n\t\t\t\t\t}\n\n\t\t\t\t\tmaxIndex = Math.max( maxIndex, i );\n\n\t\t\t\t\t// Visible fragments\n\t\t\t\t\tif( i <= index ) {\n\t\t\t\t\t\tlet wasVisible = el.classList.contains( 'visible' )\n\t\t\t\t\t\tel.classList.add( 'visible' );\n\t\t\t\t\t\tel.classList.remove( 'current-fragment' );\n\n\t\t\t\t\t\tif( i === index ) {\n\t\t\t\t\t\t\t// Announce the fragments one by one to the Screen Reader\n\t\t\t\t\t\t\tthis.Reveal.announceStatus( this.Reveal.getStatusText( el ) );\n\n\t\t\t\t\t\t\tel.classList.add( 'current-fragment' );\n\t\t\t\t\t\t\tthis.Reveal.slideContent.startEmbeddedContent( el );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tif( !wasVisible ) {\n\t\t\t\t\t\t\tchangedFragments.shown.push( el )\n\t\t\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\t\t\ttarget: el,\n\t\t\t\t\t\t\t\ttype: 'visible',\n\t\t\t\t\t\t\t\tbubbles: false\n\t\t\t\t\t\t\t});\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\t// Hidden fragments\n\t\t\t\t\telse {\n\t\t\t\t\t\tlet wasVisible = el.classList.contains( 'visible' )\n\t\t\t\t\t\tel.classList.remove( 'visible' );\n\t\t\t\t\t\tel.classList.remove( 'current-fragment' );\n\n\t\t\t\t\t\tif( wasVisible ) {\n\t\t\t\t\t\t\tthis.Reveal.slideContent.stopEmbeddedContent( el );\n\t\t\t\t\t\t\tchangedFragments.hidden.push( el );\n\t\t\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\t\t\ttarget: el,\n\t\t\t\t\t\t\t\ttype: 'hidden',\n\t\t\t\t\t\t\t\tbubbles: false\n\t\t\t\t\t\t\t});\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t} );\n\n\t\t\t\t// Write the current fragment index to the slide <section>.\n\t\t\t\t// This can be used by end users to apply styles based on\n\t\t\t\t// the current fragment index.\n\t\t\t\tindex = typeof index === 'number' ? index : -1;\n\t\t\t\tindex = Math.max( Math.min( index, maxIndex ), -1 );\n\t\t\t\tcurrentSlide.setAttribute( 'data-fragment', index );\n\n\t\t\t}\n\n\t\t}\n\n\t\treturn changedFragments;\n\n\t}\n\n\t/**\n\t * Formats the fragments on the given slide so that they have\n\t * valid indices. Call this if fragments are changed in the DOM\n\t * after reveal.js has already initialized.\n\t *\n\t * @param {HTMLElement} slide\n\t * @return {Array} a list of the HTML fragments that were synced\n\t */\n\tsync( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\treturn this.sort( slide.querySelectorAll( '.fragment' ) );\n\n\t}\n\n\t/**\n\t * Navigate to the specified slide fragment.\n\t *\n\t * @param {?number} index The index of the fragment that\n\t * should be shown, -1 means all are invisible\n\t * @param {number} offset Integer offset to apply to the\n\t * fragment index\n\t *\n\t * @return {boolean} true if a change was made in any\n\t * fragments visibility as part of this call\n\t */\n\tgoto( index, offset = 0 ) {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\n\t\t\tlet fragments = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled)' ) );\n\t\t\tif( fragments.length ) {\n\n\t\t\t\t// If no index is specified, find the current\n\t\t\t\tif( typeof index !== 'number' ) {\n\t\t\t\t\tlet lastVisibleFragment = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled).visible' ) ).pop();\n\n\t\t\t\t\tif( lastVisibleFragment ) {\n\t\t\t\t\t\tindex = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tindex = -1;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Apply the offset if there is one\n\t\t\t\tindex += offset;\n\n\t\t\t\tlet changedFragments = this.update( index, fragments );\n\n\t\t\t\tif( changedFragments.hidden.length ) {\n\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\ttype: 'fragmenthidden',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\tfragment: changedFragments.hidden[0],\n\t\t\t\t\t\t\tfragments: changedFragments.hidden\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tif( changedFragments.shown.length ) {\n\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\ttype: 'fragmentshown',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\tfragment: changedFragments.shown[0],\n\t\t\t\t\t\t\tfragments: changedFragments.shown\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tthis.Reveal.controls.update();\n\t\t\t\tthis.Reveal.progress.update();\n\n\t\t\t\tif( this.Reveal.getConfig().fragmentInURL ) {\n\t\t\t\t\tthis.Reveal.location.writeURL();\n\t\t\t\t}\n\n\t\t\t\treturn !!( changedFragments.shown.length || changedFragments.hidden.length );\n\n\t\t\t}\n\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Navigate to the next slide fragment.\n\t *\n\t * @return {boolean} true if there was a next fragment,\n\t * false otherwise\n\t */\n\tnext() {\n\n\t\treturn this.goto( null, 1 );\n\n\t}\n\n\t/**\n\t * Navigate to the previous slide fragment.\n\t *\n\t * @return {boolean} true if there was a previous fragment,\n\t * false otherwise\n\t */\n\tprev() {\n\n\t\treturn this.goto( null, -1 );\n\n\t}\n\n}","import { SLIDES_SELECTOR } from '../utils/constants.js'\nimport { extend, queryAll, transformElement } from '../utils/util.js'\n\n/**\n * Handles all logic related to the overview mode\n * (birds-eye view of all slides).\n */\nexport default class Overview {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.active = false;\n\n\t\tthis.onSlideClicked = this.onSlideClicked.bind( this );\n\n\t}\n\n\t/**\n\t * Displays the overview of slides (quick nav) by scaling\n\t * down and arranging all slide elements.\n\t */\n\tactivate() {\n\n\t\t// Only proceed if enabled in config\n\t\tif( this.Reveal.getConfig().overview && !this.isActive() ) {\n\n\t\t\tthis.active = true;\n\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'overview' );\n\n\t\t\t// Don't auto-slide while in overview mode\n\t\t\tthis.Reveal.cancelAutoSlide();\n\n\t\t\t// Move the backgrounds element into the slide container to\n\t\t\t// that the same scaling is applied\n\t\t\tthis.Reveal.getSlidesElement().appendChild( this.Reveal.getBackgroundsElement() );\n\n\t\t\t// Clicking on an overview slide navigates to it\n\t\t\tqueryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {\n\t\t\t\tif( !slide.classList.contains( 'stack' ) ) {\n\t\t\t\t\tslide.addEventListener( 'click', this.onSlideClicked, true );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Calculate slide sizes\n\t\t\tconst margin = 70;\n\t\t\tconst slideSize = this.Reveal.getComputedSlideSize();\n\t\t\tthis.overviewSlideWidth = slideSize.width + margin;\n\t\t\tthis.overviewSlideHeight = slideSize.height + margin;\n\n\t\t\t// Reverse in RTL mode\n\t\t\tif( this.Reveal.getConfig().rtl ) {\n\t\t\t\tthis.overviewSlideWidth = -this.overviewSlideWidth;\n\t\t\t}\n\n\t\t\tthis.Reveal.updateSlidesVisibility();\n\n\t\t\tthis.layout();\n\t\t\tthis.update();\n\n\t\t\tthis.Reveal.layout();\n\n\t\t\tconst indices = this.Reveal.getIndices();\n\n\t\t\t// Notify observers of the overview showing\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'overviewshown',\n\t\t\t\tdata: {\n\t\t\t\t\t'indexh': indices.h,\n\t\t\t\t\t'indexv': indices.v,\n\t\t\t\t\t'currentSlide': this.Reveal.getCurrentSlide()\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Uses CSS transforms to position all slides in a grid for\n\t * display inside of the overview mode.\n\t */\n\tlayout() {\n\n\t\t// Layout slides\n\t\tthis.Reveal.getHorizontalSlides().forEach( ( hslide, h ) => {\n\t\t\thslide.setAttribute( 'data-index-h', h );\n\t\t\ttransformElement( hslide, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );\n\n\t\t\tif( hslide.classList.contains( 'stack' ) ) {\n\n\t\t\t\tqueryAll( hslide, 'section' ).forEach( ( vslide, v ) => {\n\t\t\t\t\tvslide.setAttribute( 'data-index-h', h );\n\t\t\t\t\tvslide.setAttribute( 'data-index-v', v );\n\n\t\t\t\t\ttransformElement( vslide, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );\n\t\t\t\t} );\n\n\t\t\t}\n\t\t} );\n\n\t\t// Layout slide backgrounds\n\t\tArray.from( this.Reveal.getBackgroundsElement().childNodes ).forEach( ( hbackground, h ) => {\n\t\t\ttransformElement( hbackground, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );\n\n\t\t\tqueryAll( hbackground, '.slide-background' ).forEach( ( vbackground, v ) => {\n\t\t\t\ttransformElement( vbackground, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );\n\t\t\t} );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Moves the overview viewport to the current slides.\n\t * Called each time the current slide changes.\n\t */\n\tupdate() {\n\n\t\tconst vmin = Math.min( window.innerWidth, window.innerHeight );\n\t\tconst scale = Math.max( vmin / 5, 150 ) / vmin;\n\t\tconst indices = this.Reveal.getIndices();\n\n\t\tthis.Reveal.transformSlides( {\n\t\t\toverview: [\n\t\t\t\t'scale('+ scale +')',\n\t\t\t\t'translateX('+ ( -indices.h * this.overviewSlideWidth ) +'px)',\n\t\t\t\t'translateY('+ ( -indices.v * this.overviewSlideHeight ) +'px)'\n\t\t\t].join( ' ' )\n\t\t} );\n\n\t}\n\n\t/**\n\t * Exits the slide overview and enters the currently\n\t * active slide.\n\t */\n\tdeactivate() {\n\n\t\t// Only proceed if enabled in config\n\t\tif( this.Reveal.getConfig().overview ) {\n\n\t\t\tthis.active = false;\n\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'overview' );\n\n\t\t\t// Temporarily add a class so that transitions can do different things\n\t\t\t// depending on whether they are exiting/entering overview, or just\n\t\t\t// moving from slide to slide\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'overview-deactivating' );\n\n\t\t\tsetTimeout( () => {\n\t\t\t\tthis.Reveal.getRevealElement().classList.remove( 'overview-deactivating' );\n\t\t\t}, 1 );\n\n\t\t\t// Move the background element back out\n\t\t\tthis.Reveal.getRevealElement().appendChild( this.Reveal.getBackgroundsElement() );\n\n\t\t\t// Clean up changes made to slides\n\t\t\tqueryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {\n\t\t\t\ttransformElement( slide, '' );\n\n\t\t\t\tslide.removeEventListener( 'click', this.onSlideClicked, true );\n\t\t\t} );\n\n\t\t\t// Clean up changes made to backgrounds\n\t\t\tqueryAll( this.Reveal.getBackgroundsElement(), '.slide-background' ).forEach( background => {\n\t\t\t\ttransformElement( background, '' );\n\t\t\t} );\n\n\t\t\tthis.Reveal.transformSlides( { overview: '' } );\n\n\t\t\tconst indices = this.Reveal.getIndices();\n\n\t\t\tthis.Reveal.slide( indices.h, indices.v );\n\t\t\tthis.Reveal.layout();\n\t\t\tthis.Reveal.cueAutoSlide();\n\n\t\t\t// Notify observers of the overview hiding\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'overviewhidden',\n\t\t\t\tdata: {\n\t\t\t\t\t'indexh': indices.h,\n\t\t\t\t\t'indexv': indices.v,\n\t\t\t\t\t'currentSlide': this.Reveal.getCurrentSlide()\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\t}\n\n\t/**\n\t * Toggles the slide overview mode on and off.\n\t *\n\t * @param {Boolean} [override] Flag which overrides the\n\t * toggle logic and forcibly sets the desired state. True means\n\t * overview is open, false means it's closed.\n\t */\n\ttoggle( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? this.activate() : this.deactivate();\n\t\t}\n\t\telse {\n\t\t\tthis.isActive() ? this.deactivate() : this.activate();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if the overview is currently active.\n\t *\n\t * @return {Boolean} true if the overview is active,\n\t * false otherwise\n\t */\n\tisActive() {\n\n\t\treturn this.active;\n\n\t}\n\n\t/**\n\t * Invoked when a slide is and we're in the overview.\n\t *\n\t * @param {object} event\n\t */\n\tonSlideClicked( event ) {\n\n\t\tif( this.isActive() ) {\n\t\t\tevent.preventDefault();\n\n\t\t\tlet element = event.target;\n\n\t\t\twhile( element && !element.nodeName.match( /section/gi ) ) {\n\t\t\t\telement = element.parentNode;\n\t\t\t}\n\n\t\t\tif( element && !element.classList.contains( 'disabled' ) ) {\n\n\t\t\t\tthis.deactivate();\n\n\t\t\t\tif( element.nodeName.match( /section/gi ) ) {\n\t\t\t\t\tlet h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),\n\t\t\t\t\t\tv = parseInt( element.getAttribute( 'data-index-v' ), 10 );\n\n\t\t\t\t\tthis.Reveal.slide( h, v );\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\n\t}\n\n}","import { enterFullscreen } from '../utils/util.js'\n\n/**\n * Handles all reveal.js keyboard interactions.\n */\nexport default class Keyboard {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// A key:value map of keyboard keys and descriptions of\n\t\t// the actions they trigger\n\t\tthis.shortcuts = {};\n\n\t\t// Holds custom key code mappings\n\t\tthis.bindings = {};\n\n\t\tthis.onDocumentKeyDown = this.onDocumentKeyDown.bind( this );\n\t\tthis.onDocumentKeyPress = this.onDocumentKeyPress.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.navigationMode === 'linear' ) {\n\t\t\tthis.shortcuts['&#8594;  ,  &#8595;  ,  SPACE  ,  N  ,  L  ,  J'] = 'Next slide';\n\t\t\tthis.shortcuts['&#8592;  ,  &#8593;  ,  P  ,  H  ,  K']           = 'Previous slide';\n\t\t}\n\t\telse {\n\t\t\tthis.shortcuts['N  ,  SPACE']   = 'Next slide';\n\t\t\tthis.shortcuts['P  ,  Shift SPACE']             = 'Previous slide';\n\t\t\tthis.shortcuts['&#8592;  ,  H'] = 'Navigate left';\n\t\t\tthis.shortcuts['&#8594;  ,  L'] = 'Navigate right';\n\t\t\tthis.shortcuts['&#8593;  ,  K'] = 'Navigate up';\n\t\t\tthis.shortcuts['&#8595;  ,  J'] = 'Navigate down';\n\t\t}\n\n\t\tthis.shortcuts['Alt + &#8592;/&#8593/&#8594;/&#8595;']        = 'Navigate without fragments';\n\t\tthis.shortcuts['Shift + &#8592;/&#8593/&#8594;/&#8595;']      = 'Jump to first/last slide';\n\t\tthis.shortcuts['B  ,  .']                       = 'Pause';\n\t\tthis.shortcuts['F']                             = 'Fullscreen';\n\t\tthis.shortcuts['ESC, O']                        = 'Slide overview';\n\n\t}\n\n\t/**\n\t * Starts listening for keyboard events.\n\t */\n\tbind() {\n\n\t\tdocument.addEventListener( 'keydown', this.onDocumentKeyDown, false );\n\t\tdocument.addEventListener( 'keypress', this.onDocumentKeyPress, false );\n\n\t}\n\n\t/**\n\t * Stops listening for keyboard events.\n\t */\n\tunbind() {\n\n\t\tdocument.removeEventListener( 'keydown', this.onDocumentKeyDown, false );\n\t\tdocument.removeEventListener( 'keypress', this.onDocumentKeyPress, false );\n\n\t}\n\n\t/**\n\t * Add a custom key binding with optional description to\n\t * be added to the help screen.\n\t */\n\taddKeyBinding( binding, callback ) {\n\n\t\tif( typeof binding === 'object' && binding.keyCode ) {\n\t\t\tthis.bindings[binding.keyCode] = {\n\t\t\t\tcallback: callback,\n\t\t\t\tkey: binding.key,\n\t\t\t\tdescription: binding.description\n\t\t\t};\n\t\t}\n\t\telse {\n\t\t\tthis.bindings[binding] = {\n\t\t\t\tcallback: callback,\n\t\t\t\tkey: null,\n\t\t\t\tdescription: null\n\t\t\t};\n\t\t}\n\n\t}\n\n\t/**\n\t * Removes the specified custom key binding.\n\t */\n\tremoveKeyBinding( keyCode ) {\n\n\t\tdelete this.bindings[keyCode];\n\n\t}\n\n\t/**\n\t * Programmatically triggers a keyboard event\n\t *\n\t * @param {int} keyCode\n\t */\n\ttriggerKey( keyCode ) {\n\n\t\tthis.onDocumentKeyDown( { keyCode } );\n\n\t}\n\n\t/**\n\t * Registers a new shortcut to include in the help overlay\n\t *\n\t * @param {String} key\n\t * @param {String} value\n\t */\n\tregisterKeyboardShortcut( key, value ) {\n\n\t\tthis.shortcuts[key] = value;\n\n\t}\n\n\tgetShortcuts() {\n\n\t\treturn this.shortcuts;\n\n\t}\n\n\tgetBindings() {\n\n\t\treturn this.bindings;\n\n\t}\n\n\t/**\n\t * Handler for the document level 'keypress' event.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentKeyPress( event ) {\n\n\t\t// Check if the pressed key is question mark\n\t\tif( event.shiftKey && event.charCode === 63 ) {\n\t\t\tthis.Reveal.toggleHelp();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the document level 'keydown' event.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentKeyDown( event ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\t// If there's a condition specified and it returns false,\n\t\t// ignore this event\n\t\tif( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// If keyboardCondition is set, only capture keyboard events\n\t\t// for embedded decks when they are focused\n\t\tif( config.keyboardCondition === 'focused' && !this.Reveal.isFocused() ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Shorthand\n\t\tlet keyCode = event.keyCode;\n\n\t\t// Remember if auto-sliding was paused so we can toggle it\n\t\tlet autoSlideWasPaused = !this.Reveal.isAutoSliding();\n\n\t\tthis.Reveal.onUserInput( event );\n\n\t\t// Is there a focused element that could be using the keyboard?\n\t\tlet activeElementIsCE = document.activeElement && document.activeElement.isContentEditable === true;\n\t\tlet activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );\n\t\tlet activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);\n\n\t\t// Whitelist certain modifiers for slide navigation shortcuts\n\t\tlet isNavigationKey = [32, 37, 38, 39, 40, 78, 80].indexOf( event.keyCode ) !== -1;\n\n\t\t// Prevent all other events when a modifier is pressed\n\t\tlet unusedModifier = \t!( isNavigationKey && event.shiftKey || event.altKey ) &&\n\t\t\t\t\t\t\t\t( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );\n\n\t\t// Disregard the event if there's a focused element or a\n\t\t// keyboard modifier key is present\n\t\tif( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;\n\n\t\t// While paused only allow resume keyboard events; 'b', 'v', '.'\n\t\tlet resumeKeyCodes = [66,86,190,191];\n\t\tlet key;\n\n\t\t// Custom key bindings for togglePause should be able to resume\n\t\tif( typeof config.keyboard === 'object' ) {\n\t\t\tfor( key in config.keyboard ) {\n\t\t\t\tif( config.keyboard[key] === 'togglePause' ) {\n\t\t\t\t\tresumeKeyCodes.push( parseInt( key, 10 ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif( this.Reveal.isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Use linear navigation if we're configured to OR if\n\t\t// the presentation is one-dimensional\n\t\tlet useLinearMode = config.navigationMode === 'linear' || !this.Reveal.hasHorizontalSlides() || !this.Reveal.hasVerticalSlides();\n\n\t\tlet triggered = false;\n\n\t\t// 1. User defined key bindings\n\t\tif( typeof config.keyboard === 'object' ) {\n\n\t\t\tfor( key in config.keyboard ) {\n\n\t\t\t\t// Check if this binding matches the pressed key\n\t\t\t\tif( parseInt( key, 10 ) === keyCode ) {\n\n\t\t\t\t\tlet value = config.keyboard[ key ];\n\n\t\t\t\t\t// Callback function\n\t\t\t\t\tif( typeof value === 'function' ) {\n\t\t\t\t\t\tvalue.apply( null, [ event ] );\n\t\t\t\t\t}\n\t\t\t\t\t// String shortcuts to reveal.js API\n\t\t\t\t\telse if( typeof value === 'string' && typeof this.Reveal[ value ] === 'function' ) {\n\t\t\t\t\t\tthis.Reveal[ value ].call();\n\t\t\t\t\t}\n\n\t\t\t\t\ttriggered = true;\n\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t// 2. Registered custom key bindings\n\t\tif( triggered === false ) {\n\n\t\t\tfor( key in this.bindings ) {\n\n\t\t\t\t// Check if this binding matches the pressed key\n\t\t\t\tif( parseInt( key, 10 ) === keyCode ) {\n\n\t\t\t\t\tlet action = this.bindings[ key ].callback;\n\n\t\t\t\t\t// Callback function\n\t\t\t\t\tif( typeof action === 'function' ) {\n\t\t\t\t\t\taction.apply( null, [ event ] );\n\t\t\t\t\t}\n\t\t\t\t\t// String shortcuts to reveal.js API\n\t\t\t\t\telse if( typeof action === 'string' && typeof this.Reveal[ action ] === 'function' ) {\n\t\t\t\t\t\tthis.Reveal[ action ].call();\n\t\t\t\t\t}\n\n\t\t\t\t\ttriggered = true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// 3. System defined key bindings\n\t\tif( triggered === false ) {\n\n\t\t\t// Assume true and try to prove false\n\t\t\ttriggered = true;\n\n\t\t\t// P, PAGE UP\n\t\t\tif( keyCode === 80 || keyCode === 33 ) {\n\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t}\n\t\t\t// N, PAGE DOWN\n\t\t\telse if( keyCode === 78 || keyCode === 34 ) {\n\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t}\n\t\t\t// H, LEFT\n\t\t\telse if( keyCode === 72 || keyCode === 37 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( 0 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.left({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// L, RIGHT\n\t\t\telse if( keyCode === 76 || keyCode === 39 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.right({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// K, UP\n\t\t\telse if( keyCode === 75 || keyCode === 38 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( undefined, 0 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.up({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// J, DOWN\n\t\t\telse if( keyCode === 74 || keyCode === 40 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( undefined, Number.MAX_VALUE );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.down({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// HOME\n\t\t\telse if( keyCode === 36 ) {\n\t\t\t\tthis.Reveal.slide( 0 );\n\t\t\t}\n\t\t\t// END\n\t\t\telse if( keyCode === 35 ) {\n\t\t\t\tthis.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );\n\t\t\t}\n\t\t\t// SPACE\n\t\t\telse if( keyCode === 32 ) {\n\t\t\t\tif( this.Reveal.overview.isActive() ) {\n\t\t\t\t\tthis.Reveal.overview.deactivate();\n\t\t\t\t}\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS \"BLACK SCREEN\" BUTTON\n\t\t\telse if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {\n\t\t\t\tthis.Reveal.togglePause();\n\t\t\t}\n\t\t\t// F\n\t\t\telse if( keyCode === 70 ) {\n\t\t\t\tenterFullscreen( config.embedded ? this.Reveal.getViewportElement() : document.documentElement );\n\t\t\t}\n\t\t\t// A\n\t\t\telse if( keyCode === 65 ) {\n\t\t\t\tif ( config.autoSlideStoppable ) {\n\t\t\t\t\tthis.Reveal.toggleAutoSlide( autoSlideWasPaused );\n\t\t\t\t}\n\t\t\t}\n\t\t\telse {\n\t\t\t\ttriggered = false;\n\t\t\t}\n\n\t\t}\n\n\t\t// If the input resulted in a triggered action we should prevent\n\t\t// the browsers default behavior\n\t\tif( triggered ) {\n\t\t\tevent.preventDefault && event.preventDefault();\n\t\t}\n\t\t// ESC or O key\n\t\telse if( keyCode === 27 || keyCode === 79 ) {\n\t\t\tif( this.Reveal.closeOverlay() === false ) {\n\t\t\t\tthis.Reveal.overview.toggle();\n\t\t\t}\n\n\t\t\tevent.preventDefault && event.preventDefault();\n\t\t}\n\n\t\t// If auto-sliding is enabled we need to cue up\n\t\t// another timeout\n\t\tthis.Reveal.cueAutoSlide();\n\n\t}\n\n}","/**\n * Reads and writes the URL based on reveal.js' current state.\n */\nexport default class Location {\n\n\t// The minimum number of milliseconds that must pass between\n\t// calls to history.replaceState\n\tMAX_REPLACE_STATE_FREQUENCY = 1000\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Delays updates to the URL due to a Chrome thumbnailer bug\n\t\tthis.writeURLTimeout = 0;\n\n\t\tthis.replaceStateTimestamp = 0;\n\n\t\tthis.onWindowHashChange = this.onWindowHashChange.bind( this );\n\n\t}\n\n\tbind() {\n\n\t\twindow.addEventListener( 'hashchange', this.onWindowHashChange, false );\n\n\t}\n\n\tunbind() {\n\n\t\twindow.removeEventListener( 'hashchange', this.onWindowHashChange, false );\n\n\t}\n\n\t/**\n\t * Returns the slide indices for the given hash link.\n\t *\n\t * @param {string} [hash] the hash string that we want to\n\t * find the indices for\n\t *\n\t * @returns slide indices or null\n\t */\n\tgetIndicesFromHash( hash=window.location.hash ) {\n\n\t\t// Attempt to parse the hash as either an index or name\n\t\tlet name = hash.replace( /^#\\/?/, '' );\n\t\tlet bits = name.split( '/' );\n\n\t\t// If the first bit is not fully numeric and there is a name we\n\t\t// can assume that this is a named link\n\t\tif( !/^[0-9]*$/.test( bits[0] ) && name.length ) {\n\t\t\tlet element;\n\n\t\t\tlet f;\n\n\t\t\t// Parse named links with fragments (#/named-link/2)\n\t\t\tif( /\\/[-\\d]+$/g.test( name ) ) {\n\t\t\t\tf = parseInt( name.split( '/' ).pop(), 10 );\n\t\t\t\tf = isNaN(f) ? undefined : f;\n\t\t\t\tname = name.split( '/' ).shift();\n\t\t\t}\n\n\t\t\t// Ensure the named link is a valid HTML ID attribute\n\t\t\ttry {\n\t\t\t\telement = document.getElementById( decodeURIComponent( name ) );\n\t\t\t}\n\t\t\tcatch ( error ) { }\n\n\t\t\tif( element ) {\n\t\t\t\treturn { ...this.Reveal.getIndices( element ), f };\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tconst config = this.Reveal.getConfig();\n\t\t\tlet hashIndexBase = config.hashOneBasedIndex ? 1 : 0;\n\n\t\t\t// Read the index components of the hash\n\t\t\tlet h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,\n\t\t\t\tv = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,\n\t\t\t\tf;\n\n\t\t\tif( config.fragmentInURL ) {\n\t\t\t\tf = parseInt( bits[2], 10 );\n\t\t\t\tif( isNaN( f ) ) {\n\t\t\t\t\tf = undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn { h, v, f };\n\t\t}\n\n\t\t// The hash couldn't be parsed or no matching named link was found\n\t\treturn null\n\n\t}\n\n\t/**\n\t * Reads the current URL (hash) and navigates accordingly.\n\t */\n\treadURL() {\n\n\t\tconst currentIndices = this.Reveal.getIndices();\n\t\tconst newIndices = this.getIndicesFromHash();\n\n\t\tif( newIndices ) {\n\t\t\tif( ( newIndices.h !== currentIndices.h || newIndices.v !== currentIndices.v || newIndices.f !== undefined ) ) {\n\t\t\t\t\tthis.Reveal.slide( newIndices.h, newIndices.v, newIndices.f );\n\t\t\t}\n\t\t}\n\t\t// If no new indices are available, we're trying to navigate to\n\t\t// a slide hash that does not exist\n\t\telse {\n\t\t\tthis.Reveal.slide( currentIndices.h || 0, currentIndices.v || 0 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the page URL (hash) to reflect the current\n\t * state.\n\t *\n\t * @param {number} delay The time in ms to wait before\n\t * writing the hash\n\t */\n\twriteURL( delay ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\n\t\t// Make sure there's never more than one timeout running\n\t\tclearTimeout( this.writeURLTimeout );\n\n\t\t// If a delay is specified, timeout this call\n\t\tif( typeof delay === 'number' ) {\n\t\t\tthis.writeURLTimeout = setTimeout( this.writeURL, delay );\n\t\t}\n\t\telse if( currentSlide ) {\n\n\t\t\tlet hash = this.getHash();\n\n\t\t\t// If we're configured to push to history OR the history\n\t\t\t// API is not avaialble.\n\t\t\tif( config.history ) {\n\t\t\t\twindow.location.hash = hash;\n\t\t\t}\n\t\t\t// If we're configured to reflect the current slide in the\n\t\t\t// URL without pushing to history.\n\t\t\telse if( config.hash ) {\n\t\t\t\t// If the hash is empty, don't add it to the URL\n\t\t\t\tif( hash === '/' ) {\n\t\t\t\t\tthis.debouncedReplaceState( window.location.pathname + window.location.search );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.debouncedReplaceState( '#' + hash );\n\t\t\t\t}\n\t\t\t}\n\t\t\t// UPDATE: The below nuking of all hash changes breaks\n\t\t\t// anchors on pages where reveal.js is running. Removed\n\t\t\t// in 4.0. Why was it here in the first place? ¯\\_(ツ)_/¯\n\t\t\t//\n\t\t\t// If history and hash are both disabled, a hash may still\n\t\t\t// be added to the URL by clicking on a href with a hash\n\t\t\t// target. Counter this by always removing the hash.\n\t\t\t// else {\n\t\t\t// \twindow.history.replaceState( null, null, window.location.pathname + window.location.search );\n\t\t\t// }\n\n\t\t}\n\n\t}\n\n\treplaceState( url ) {\n\n\t\twindow.history.replaceState( null, null, url );\n\t\tthis.replaceStateTimestamp = Date.now();\n\n\t}\n\n\tdebouncedReplaceState( url ) {\n\n\t\tclearTimeout( this.replaceStateTimeout );\n\n\t\tif( Date.now() - this.replaceStateTimestamp > this.MAX_REPLACE_STATE_FREQUENCY ) {\n\t\t\tthis.replaceState( url );\n\t\t}\n\t\telse {\n\t\t\tthis.replaceStateTimeout = setTimeout( () => this.replaceState( url ), this.MAX_REPLACE_STATE_FREQUENCY );\n\t\t}\n\n\t}\n\n\t/**\n\t * Return a hash URL that will resolve to the given slide location.\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide to link to\n\t */\n\tgetHash( slide ) {\n\n\t\tlet url = '/';\n\n\t\t// Attempt to create a named link based on the slide's ID\n\t\tlet s = slide || this.Reveal.getCurrentSlide();\n\t\tlet id = s ? s.getAttribute( 'id' ) : null;\n\t\tif( id ) {\n\t\t\tid = encodeURIComponent( id );\n\t\t}\n\n\t\tlet index = this.Reveal.getIndices( slide );\n\t\tif( !this.Reveal.getConfig().fragmentInURL ) {\n\t\t\tindex.f = undefined;\n\t\t}\n\n\t\t// If the current slide has an ID, use that as a named link,\n\t\t// but we don't support named links with a fragment index\n\t\tif( typeof id === 'string' && id.length ) {\n\t\t\turl = '/' + id;\n\n\t\t\t// If there is also a fragment, append that at the end\n\t\t\t// of the named link, like: #/named-link/2\n\t\t\tif( index.f >= 0 ) url += '/' + index.f;\n\t\t}\n\t\t// Otherwise use the /h/v index\n\t\telse {\n\t\t\tlet hashIndexBase = this.Reveal.getConfig().hashOneBasedIndex ? 1 : 0;\n\t\t\tif( index.h > 0 || index.v > 0 || index.f >= 0 ) url += index.h + hashIndexBase;\n\t\t\tif( index.v > 0 || index.f >= 0 ) url += '/' + (index.v + hashIndexBase );\n\t\t\tif( index.f >= 0 ) url += '/' + index.f;\n\t\t}\n\n\t\treturn url;\n\n\t}\n\n\t/**\n\t * Handler for the window level 'hashchange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tonWindowHashChange( event ) {\n\n\t\tthis.readURL();\n\n\t}\n\n}","import { queryAll } from '../utils/util.js'\nimport { isAndroid } from '../utils/device.js'\n\n/**\n * Manages our presentation controls. This includes both\n * the built-in control arrows as well as event monitoring\n * of any elements within the presentation with either of the\n * following helper classes:\n * - .navigate-up\n * - .navigate-right\n * - .navigate-down\n * - .navigate-left\n * - .navigate-next\n * - .navigate-prev\n */\nexport default class Controls {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onNavigateLeftClicked = this.onNavigateLeftClicked.bind( this );\n\t\tthis.onNavigateRightClicked = this.onNavigateRightClicked.bind( this );\n\t\tthis.onNavigateUpClicked = this.onNavigateUpClicked.bind( this );\n\t\tthis.onNavigateDownClicked = this.onNavigateDownClicked.bind( this );\n\t\tthis.onNavigatePrevClicked = this.onNavigatePrevClicked.bind( this );\n\t\tthis.onNavigateNextClicked = this.onNavigateNextClicked.bind( this );\n\n\t}\n\n\trender() {\n\n\t\tconst rtl = this.Reveal.getConfig().rtl;\n\t\tconst revealElement = this.Reveal.getRevealElement();\n\n\t\tthis.element = document.createElement( 'aside' );\n\t\tthis.element.className = 'controls';\n\t\tthis.element.innerHTML =\n\t\t\t`<button class=\"navigate-left\" aria-label=\"${ rtl ? 'next slide' : 'previous slide' }\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-right\" aria-label=\"${ rtl ? 'previous slide' : 'next slide' }\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-up\" aria-label=\"above slide\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-down\" aria-label=\"below slide\"><div class=\"controls-arrow\"></div></button>`;\n\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t\t// There can be multiple instances of controls throughout the page\n\t\tthis.controlsLeft = queryAll( revealElement, '.navigate-left' );\n\t\tthis.controlsRight = queryAll( revealElement, '.navigate-right' );\n\t\tthis.controlsUp = queryAll( revealElement, '.navigate-up' );\n\t\tthis.controlsDown = queryAll( revealElement, '.navigate-down' );\n\t\tthis.controlsPrev = queryAll( revealElement, '.navigate-prev' );\n\t\tthis.controlsNext = queryAll( revealElement, '.navigate-next' );\n\n\t\t// The left, right and down arrows in the standard reveal.js controls\n\t\tthis.controlsRightArrow = this.element.querySelector( '.navigate-right' );\n\t\tthis.controlsLeftArrow = this.element.querySelector( '.navigate-left' );\n\t\tthis.controlsDownArrow = this.element.querySelector( '.navigate-down' );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tthis.element.style.display = config.controls ? 'block' : 'none';\n\n\t\tthis.element.setAttribute( 'data-controls-layout', config.controlsLayout );\n\t\tthis.element.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );\n\n\t}\n\n\tbind() {\n\n\t\t// Listen to both touch and click events, in case the device\n\t\t// supports both\n\t\tlet pointerEvents = [ 'touchstart', 'click' ];\n\n\t\t// Only support touch for Android, fixes double navigations in\n\t\t// stock browser\n\t\tif( isAndroid ) {\n\t\t\tpointerEvents = [ 'touchstart' ];\n\t\t}\n\n\t\tpointerEvents.forEach( eventName => {\n\t\t\tthis.controlsLeft.forEach( el => el.addEventListener( eventName, this.onNavigateLeftClicked, false ) );\n\t\t\tthis.controlsRight.forEach( el => el.addEventListener( eventName, this.onNavigateRightClicked, false ) );\n\t\t\tthis.controlsUp.forEach( el => el.addEventListener( eventName, this.onNavigateUpClicked, false ) );\n\t\t\tthis.controlsDown.forEach( el => el.addEventListener( eventName, this.onNavigateDownClicked, false ) );\n\t\t\tthis.controlsPrev.forEach( el => el.addEventListener( eventName, this.onNavigatePrevClicked, false ) );\n\t\t\tthis.controlsNext.forEach( el => el.addEventListener( eventName, this.onNavigateNextClicked, false ) );\n\t\t} );\n\n\t}\n\n\tunbind() {\n\n\t\t[ 'touchstart', 'click' ].forEach( eventName => {\n\t\t\tthis.controlsLeft.forEach( el => el.removeEventListener( eventName, this.onNavigateLeftClicked, false ) );\n\t\t\tthis.controlsRight.forEach( el => el.removeEventListener( eventName, this.onNavigateRightClicked, false ) );\n\t\t\tthis.controlsUp.forEach( el => el.removeEventListener( eventName, this.onNavigateUpClicked, false ) );\n\t\t\tthis.controlsDown.forEach( el => el.removeEventListener( eventName, this.onNavigateDownClicked, false ) );\n\t\t\tthis.controlsPrev.forEach( el => el.removeEventListener( eventName, this.onNavigatePrevClicked, false ) );\n\t\t\tthis.controlsNext.forEach( el => el.removeEventListener( eventName, this.onNavigateNextClicked, false ) );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Updates the state of all control/navigation arrows.\n\t */\n\tupdate() {\n\n\t\tlet routes = this.Reveal.availableRoutes();\n\n\t\t// Remove the 'enabled' class from all directions\n\t\t[...this.controlsLeft, ...this.controlsRight, ...this.controlsUp, ...this.controlsDown, ...this.controlsPrev, ...this.controlsNext].forEach( node => {\n\t\t\tnode.classList.remove( 'enabled', 'fragmented' );\n\n\t\t\t// Set 'disabled' attribute on all directions\n\t\t\tnode.setAttribute( 'disabled', 'disabled' );\n\t\t} );\n\n\t\t// Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons\n\t\tif( routes.left ) this.controlsLeft.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.right ) this.controlsRight.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.up ) this.controlsUp.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.down ) this.controlsDown.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t// Prev/next buttons\n\t\tif( routes.left || routes.up ) this.controlsPrev.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.right || routes.down ) this.controlsNext.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t// Highlight fragment directions\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide ) {\n\n\t\t\tlet fragmentsRoutes = this.Reveal.fragments.availableRoutes();\n\n\t\t\t// Always apply fragment decorator to prev/next buttons\n\t\t\tif( fragmentsRoutes.prev ) this.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\tif( fragmentsRoutes.next ) this.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t\t// Apply fragment decorators to directional buttons based on\n\t\t\t// what slide axis they are in\n\t\t\tif( this.Reveal.isVerticalSlide( currentSlide ) ) {\n\t\t\t\tif( fragmentsRoutes.prev ) this.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t\tif( fragmentsRoutes.next ) this.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif( fragmentsRoutes.prev ) this.controlsLeft.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t\tif( fragmentsRoutes.next ) this.controlsRight.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t}\n\n\t\t}\n\n\t\tif( this.Reveal.getConfig().controlsTutorial ) {\n\n\t\t\tlet indices = this.Reveal.getIndices();\n\n\t\t\t// Highlight control arrows with an animation to ensure\n\t\t\t// that the viewer knows how to navigate\n\t\t\tif( !this.Reveal.hasNavigatedVertically() && routes.down ) {\n\t\t\t\tthis.controlsDownArrow.classList.add( 'highlight' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.controlsDownArrow.classList.remove( 'highlight' );\n\n\t\t\t\tif( this.Reveal.getConfig().rtl ) {\n\n\t\t\t\t\tif( !this.Reveal.hasNavigatedHorizontally() && routes.left && indices.v === 0 ) {\n\t\t\t\t\t\tthis.controlsLeftArrow.classList.add( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.controlsLeftArrow.classList.remove( 'highlight' );\n\t\t\t\t\t}\n\n\t\t\t\t} else {\n\n\t\t\t\t\tif( !this.Reveal.hasNavigatedHorizontally() && routes.right && indices.v === 0 ) {\n\t\t\t\t\t\tthis.controlsRightArrow.classList.add( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.controlsRightArrow.classList.remove( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tdestroy() {\n\n\t\tthis.unbind();\n\t\tthis.element.remove();\n\n\t}\n\n\t/**\n\t * Event handlers for navigation control buttons.\n\t */\n\tonNavigateLeftClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tif( this.Reveal.getConfig().navigationMode === 'linear' ) {\n\t\t\tthis.Reveal.prev();\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.left();\n\t\t}\n\n\t}\n\n\tonNavigateRightClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tif( this.Reveal.getConfig().navigationMode === 'linear' ) {\n\t\t\tthis.Reveal.next();\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.right();\n\t\t}\n\n\t}\n\n\tonNavigateUpClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.up();\n\n\t}\n\n\tonNavigateDownClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.down();\n\n\t}\n\n\tonNavigatePrevClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.prev();\n\n\t}\n\n\tonNavigateNextClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.next();\n\n\t}\n\n\n}","/**\n * Creates a visual progress bar for the presentation.\n */\nexport default class Progress {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onProgressClicked = this.onProgressClicked.bind( this );\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'progress';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t\tthis.bar = document.createElement( 'span' );\n\t\tthis.element.appendChild( this.bar );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tthis.element.style.display = config.progress ? 'block' : 'none';\n\n\t}\n\n\tbind() {\n\n\t\tif( this.Reveal.getConfig().progress && this.element ) {\n\t\t\tthis.element.addEventListener( 'click', this.onProgressClicked, false );\n\t\t}\n\n\t}\n\n\tunbind() {\n\n\t\tif ( this.Reveal.getConfig().progress && this.element ) {\n\t\t\tthis.element.removeEventListener( 'click', this.onProgressClicked, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the progress bar to reflect the current slide.\n\t */\n\tupdate() {\n\n\t\t// Update progress if enabled\n\t\tif( this.Reveal.getConfig().progress && this.bar ) {\n\n\t\t\tlet scale = this.Reveal.getProgress();\n\n\t\t\t// Don't fill the progress bar if there's only one slide\n\t\t\tif( this.Reveal.getTotalSlides() < 2 ) {\n\t\t\t\tscale = 0;\n\t\t\t}\n\n\t\t\tthis.bar.style.transform = 'scaleX('+ scale +')';\n\n\t\t}\n\n\t}\n\n\tgetMaxWidth() {\n\n\t\treturn this.Reveal.getRevealElement().offsetWidth;\n\n\t}\n\n\t/**\n\t * Clicking on the progress bar results in a navigation to the\n\t * closest approximate horizontal slide using this equation:\n\t *\n\t * ( clickX / presentationWidth ) * numberOfSlides\n\t *\n\t * @param {object} event\n\t */\n\tonProgressClicked( event ) {\n\n\t\tthis.Reveal.onUserInput( event );\n\n\t\tevent.preventDefault();\n\n\t\tlet slides = this.Reveal.getSlides();\n\t\tlet slidesTotal = slides.length;\n\t\tlet slideIndex = Math.floor( ( event.clientX / this.getMaxWidth() ) * slidesTotal );\n\n\t\tif( this.Reveal.getConfig().rtl ) {\n\t\t\tslideIndex = slidesTotal - slideIndex;\n\t\t}\n\n\t\tlet targetIndices = this.Reveal.getIndices(slides[slideIndex]);\n\t\tthis.Reveal.slide( targetIndices.h, targetIndices.v );\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","/**\n * Handles hiding of the pointer/cursor when inactive.\n */\nexport default class Pointer {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Throttles mouse wheel navigation\n\t\tthis.lastMouseWheelStep = 0;\n\n\t\t// Is the mouse pointer currently hidden from view\n\t\tthis.cursorHidden = false;\n\n\t\t// Timeout used to determine when the cursor is inactive\n\t\tthis.cursorInactiveTimeout = 0;\n\n\t\tthis.onDocumentCursorActive = this.onDocumentCursorActive.bind( this );\n\t\tthis.onDocumentMouseScroll = this.onDocumentMouseScroll.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.mouseWheel ) {\n\t\t\tdocument.addEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF\n\t\t\tdocument.addEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\t}\n\t\telse {\n\t\t\tdocument.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF\n\t\t\tdocument.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\t}\n\n\t\t// Auto-hide the mouse pointer when its inactive\n\t\tif( config.hideInactiveCursor ) {\n\t\t\tdocument.addEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\t\tdocument.addEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\t\t}\n\t\telse {\n\t\t\tthis.showCursor();\n\n\t\t\tdocument.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\t\tdocument.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Shows the mouse pointer after it has been hidden with\n\t * #hideCursor.\n\t */\n\tshowCursor() {\n\n\t\tif( this.cursorHidden ) {\n\t\t\tthis.cursorHidden = false;\n\t\t\tthis.Reveal.getRevealElement().style.cursor = '';\n\t\t}\n\n\t}\n\n\t/**\n\t * Hides the mouse pointer when it's on top of the .reveal\n\t * container.\n\t */\n\thideCursor() {\n\n\t\tif( this.cursorHidden === false ) {\n\t\t\tthis.cursorHidden = true;\n\t\t\tthis.Reveal.getRevealElement().style.cursor = 'none';\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.showCursor();\n\n\t\tdocument.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false );\n\t\tdocument.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\tdocument.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\tdocument.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\n\t}\n\n\t/**\n\t * Called whenever there is mouse input at the document level\n\t * to determine if the cursor is active or not.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentCursorActive( event ) {\n\n\t\tthis.showCursor();\n\n\t\tclearTimeout( this.cursorInactiveTimeout );\n\n\t\tthis.cursorInactiveTimeout = setTimeout( this.hideCursor.bind( this ), this.Reveal.getConfig().hideCursorTime );\n\n\t}\n\n\t/**\n\t * Handles mouse wheel scrolling, throttled to avoid skipping\n\t * multiple slides.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentMouseScroll( event ) {\n\n\t\tif( Date.now() - this.lastMouseWheelStep > 1000 ) {\n\n\t\t\tthis.lastMouseWheelStep = Date.now();\n\n\t\t\tlet delta = event.detail || -event.wheelDelta;\n\t\t\tif( delta > 0 ) {\n\t\t\t\tthis.Reveal.next();\n\t\t\t}\n\t\t\telse if( delta < 0 ) {\n\t\t\t\tthis.Reveal.prev();\n\t\t\t}\n\n\t\t}\n\n\t}\n\n}","/**\n * Loads a JavaScript file from the given URL and executes it.\n *\n * @param {string} url Address of the .js file to load\n * @param {function} callback Method to invoke when the script\n * has loaded and executed\n */\nexport const loadScript = ( url, callback ) => {\n\n\tconst script = document.createElement( 'script' );\n\tscript.type = 'text/javascript';\n\tscript.async = false;\n\tscript.defer = false;\n\tscript.src = url;\n\n\tif( typeof callback === 'function' ) {\n\n\t\t// Success callback\n\t\tscript.onload = script.onreadystatechange = event => {\n\t\t\tif( event.type === 'load' || /loaded|complete/.test( script.readyState ) ) {\n\n\t\t\t\t// Kill event listeners\n\t\t\t\tscript.onload = script.onreadystatechange = script.onerror = null;\n\n\t\t\t\tcallback();\n\n\t\t\t}\n\t\t};\n\n\t\t// Error callback\n\t\tscript.onerror = err => {\n\n\t\t\t// Kill event listeners\n\t\t\tscript.onload = script.onreadystatechange = script.onerror = null;\n\n\t\t\tcallback( new Error( 'Failed loading script: ' + script.src + '\\n' + err ) );\n\n\t\t};\n\n\t}\n\n\t// Append the script at the end of <head>\n\tconst head = document.querySelector( 'head' );\n\thead.insertBefore( script, head.lastChild );\n\n}","import { loadScript } from '../utils/loader.js'\n\n/**\n * Manages loading and registering of reveal.js plugins.\n */\nexport default class Plugins {\n\n\tconstructor( reveal ) {\n\n\t\tthis.Reveal = reveal;\n\n\t\t// Flags our current state (idle -> loading -> loaded)\n\t\tthis.state = 'idle';\n\n\t\t// An id:instance map of currently registed plugins\n\t\tthis.registeredPlugins = {};\n\n\t\tthis.asyncDependencies = [];\n\n\t}\n\n\t/**\n\t * Loads reveal.js dependencies, registers and\n\t * initializes plugins.\n\t *\n\t * Plugins are direct references to a reveal.js plugin\n\t * object that we register and initialize after any\n\t * synchronous dependencies have loaded.\n\t *\n\t * Dependencies are defined via the 'dependencies' config\n\t * option and will be loaded prior to starting reveal.js.\n\t * Some dependencies may have an 'async' flag, if so they\n\t * will load after reveal.js has been started up.\n\t */\n\tload( plugins, dependencies ) {\n\n\t\tthis.state = 'loading';\n\n\t\tplugins.forEach( this.registerPlugin.bind( this ) );\n\n\t\treturn new Promise( resolve => {\n\n\t\t\tlet scripts = [],\n\t\t\t\tscriptsToLoad = 0;\n\n\t\t\tdependencies.forEach( s => {\n\t\t\t\t// Load if there's no condition or the condition is truthy\n\t\t\t\tif( !s.condition || s.condition() ) {\n\t\t\t\t\tif( s.async ) {\n\t\t\t\t\t\tthis.asyncDependencies.push( s );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tscripts.push( s );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tif( scripts.length ) {\n\t\t\t\tscriptsToLoad = scripts.length;\n\n\t\t\t\tconst scriptLoadedCallback = (s) => {\n\t\t\t\t\tif( s && typeof s.callback === 'function' ) s.callback();\n\n\t\t\t\t\tif( --scriptsToLoad === 0 ) {\n\t\t\t\t\t\tthis.initPlugins().then( resolve );\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\t// Load synchronous scripts\n\t\t\t\tscripts.forEach( s => {\n\t\t\t\t\tif( typeof s.id === 'string' ) {\n\t\t\t\t\t\tthis.registerPlugin( s );\n\t\t\t\t\t\tscriptLoadedCallback( s );\n\t\t\t\t\t}\n\t\t\t\t\telse if( typeof s.src === 'string' ) {\n\t\t\t\t\t\tloadScript( s.src, () => scriptLoadedCallback(s) );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tconsole.warn( 'Unrecognized plugin format', s );\n\t\t\t\t\t\tscriptLoadedCallback();\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.initPlugins().then( resolve );\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Initializes our plugins and waits for them to be ready\n\t * before proceeding.\n\t */\n\tinitPlugins() {\n\n\t\treturn new Promise( resolve => {\n\n\t\t\tlet pluginValues = Object.values( this.registeredPlugins );\n\t\t\tlet pluginsToInitialize = pluginValues.length;\n\n\t\t\t// If there are no plugins, skip this step\n\t\t\tif( pluginsToInitialize === 0 ) {\n\t\t\t\tthis.loadAsync().then( resolve );\n\t\t\t}\n\t\t\t// ... otherwise initialize plugins\n\t\t\telse {\n\n\t\t\t\tlet initNextPlugin;\n\n\t\t\t\tlet afterPlugInitialized = () => {\n\t\t\t\t\tif( --pluginsToInitialize === 0 ) {\n\t\t\t\t\t\tthis.loadAsync().then( resolve );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tinitNextPlugin();\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\tlet i = 0;\n\n\t\t\t\t// Initialize plugins serially\n\t\t\t\tinitNextPlugin = () => {\n\n\t\t\t\t\tlet plugin = pluginValues[i++];\n\n\t\t\t\t\t// If the plugin has an 'init' method, invoke it\n\t\t\t\t\tif( typeof plugin.init === 'function' ) {\n\t\t\t\t\t\tlet promise = plugin.init( this.Reveal );\n\n\t\t\t\t\t\t// If the plugin returned a Promise, wait for it\n\t\t\t\t\t\tif( promise && typeof promise.then === 'function' ) {\n\t\t\t\t\t\t\tpromise.then( afterPlugInitialized );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tafterPlugInitialized();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tafterPlugInitialized();\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tinitNextPlugin();\n\n\t\t\t}\n\n\t\t} )\n\n\t}\n\n\t/**\n\t * Loads all async reveal.js dependencies.\n\t */\n\tloadAsync() {\n\n\t\tthis.state = 'loaded';\n\n\t\tif( this.asyncDependencies.length ) {\n\t\t\tthis.asyncDependencies.forEach( s => {\n\t\t\t\tloadScript( s.src, s.callback );\n\t\t\t} );\n\t\t}\n\n\t\treturn Promise.resolve();\n\n\t}\n\n\t/**\n\t * Registers a new plugin with this reveal.js instance.\n\t *\n\t * reveal.js waits for all regisered plugins to initialize\n\t * before considering itself ready, as long as the plugin\n\t * is registered before calling `Reveal.initialize()`.\n\t */\n\tregisterPlugin( plugin ) {\n\n\t\t// Backwards compatibility to make reveal.js ~3.9.0\n\t\t// plugins work with reveal.js 4.0.0\n\t\tif( arguments.length === 2 && typeof arguments[0] === 'string' ) {\n\t\t\tplugin = arguments[1];\n\t\t\tplugin.id = arguments[0];\n\t\t}\n\t\t// Plugin can optionally be a function which we call\n\t\t// to create an instance of the plugin\n\t\telse if( typeof plugin === 'function' ) {\n\t\t\tplugin = plugin();\n\t\t}\n\n\t\tlet id = plugin.id;\n\n\t\tif( typeof id !== 'string' ) {\n\t\t\tconsole.warn( 'Unrecognized plugin format; can\\'t find plugin.id', plugin );\n\t\t}\n\t\telse if( this.registeredPlugins[id] === undefined ) {\n\t\t\tthis.registeredPlugins[id] = plugin;\n\n\t\t\t// If a plugin is registered after reveal.js is loaded,\n\t\t\t// initialize it right away\n\t\t\tif( this.state === 'loaded' && typeof plugin.init === 'function' ) {\n\t\t\t\tplugin.init( this.Reveal );\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tconsole.warn( 'reveal.js: \"'+ id +'\" plugin has already been registered' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if a specific plugin has been registered.\n\t *\n\t * @param {String} id Unique plugin identifier\n\t */\n\thasPlugin( id ) {\n\n\t\treturn !!this.registeredPlugins[id];\n\n\t}\n\n\t/**\n\t * Returns the specific plugin instance, if a plugin\n\t * with the given ID has been registered.\n\t *\n\t * @param {String} id Unique plugin identifier\n\t */\n\tgetPlugin( id ) {\n\n\t\treturn this.registeredPlugins[id];\n\n\t}\n\n\tgetRegisteredPlugins() {\n\n\t\treturn this.registeredPlugins;\n\n\t}\n\n\tdestroy() {\n\n\t\tObject.values( this.registeredPlugins ).forEach( plugin => {\n\t\t\tif( typeof plugin.destroy === 'function' ) {\n\t\t\t\tplugin.destroy();\n\t\t\t}\n\t\t} );\n\n\t\tthis.registeredPlugins = {};\n\t\tthis.asyncDependencies = [];\n\n\t}\n\n}\n","import { SLIDES_SELECTOR } from '../utils/constants.js'\nimport { queryAll, createStyleSheet } from '../utils/util.js'\n\n/**\n * Setups up our presentation for printing/exporting to PDF.\n */\nexport default class Print {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Configures the presentation for printing to a static\n\t * PDF.\n\t */\n\tasync setupPDF() {\n\n\t\tconst config = this.Reveal.getConfig();\n\t\tconst slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )\n\n\t\t// Compute slide numbers now, before we start duplicating slides\n\t\tconst injectPageNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );\n\n\t\tconst slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );\n\n\t\t// Dimensions of the PDF pages\n\t\tconst pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),\n\t\t\tpageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );\n\n\t\t// Dimensions of slides within the pages\n\t\tconst slideWidth = slideSize.width,\n\t\t\tslideHeight = slideSize.height;\n\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\t// Let the browser know what page size we want to print\n\t\tcreateStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );\n\n\t\t// Limit the size of certain elements to the dimensions of the slide\n\t\tcreateStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );\n\n\t\tdocument.documentElement.classList.add( 'print-pdf' );\n\t\tdocument.body.style.width = pageWidth + 'px';\n\t\tdocument.body.style.height = pageHeight + 'px';\n\n\t\tconst viewportElement = document.querySelector( '.reveal-viewport' );\n\t\tlet presentationBackground;\n\t\tif( viewportElement ) {\n\t\t\tconst viewportStyles = window.getComputedStyle( viewportElement );\n\t\t\tif( viewportStyles && viewportStyles.background ) {\n\t\t\t\tpresentationBackground = viewportStyles.background;\n\t\t\t}\n\t\t}\n\n\t\t// Make sure stretch elements fit on slide\n\t\tawait new Promise( requestAnimationFrame );\n\t\tthis.Reveal.layoutSlideContents( slideWidth, slideHeight );\n\n\t\t// Batch scrollHeight access to prevent layout thrashing\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\tconst slideScrollHeights = slides.map( slide => slide.scrollHeight );\n\n\t\tconst pages = [];\n\t\tconst pageContainer = slides[0].parentNode;\n\t\tlet slideNumber = 1;\n\n\t\t// Slide and slide background layout\n\t\tslides.forEach( function( slide, index ) {\n\n\t\t\t// Vertical stacks are not centred since their section\n\t\t\t// children will be\n\t\t\tif( slide.classList.contains( 'stack' ) === false ) {\n\t\t\t\t// Center the slide inside of the page, giving the slide some margin\n\t\t\t\tlet left = ( pageWidth - slideWidth ) / 2;\n\t\t\t\tlet top = ( pageHeight - slideHeight ) / 2;\n\n\t\t\t\tconst contentHeight = slideScrollHeights[ index ];\n\t\t\t\tlet numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );\n\n\t\t\t\t// Adhere to configured pages per slide limit\n\t\t\t\tnumberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );\n\n\t\t\t\t// Center slides vertically\n\t\t\t\tif( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {\n\t\t\t\t\ttop = Math.max( ( pageHeight - contentHeight ) / 2, 0 );\n\t\t\t\t}\n\n\t\t\t\t// Wrap the slide in a page element and hide its overflow\n\t\t\t\t// so that no page ever flows onto another\n\t\t\t\tconst page = document.createElement( 'div' );\n\t\t\t\tpages.push( page );\n\n\t\t\t\tpage.className = 'pdf-page';\n\t\t\t\tpage.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';\n\n\t\t\t\t// Copy the presentation-wide background to each individual\n\t\t\t\t// page when printing\n\t\t\t\tif( presentationBackground ) {\n\t\t\t\t\tpage.style.background = presentationBackground;\n\t\t\t\t}\n\n\t\t\t\tpage.appendChild( slide );\n\n\t\t\t\t// Position the slide inside of the page\n\t\t\t\tslide.style.left = left + 'px';\n\t\t\t\tslide.style.top = top + 'px';\n\t\t\t\tslide.style.width = slideWidth + 'px';\n\n\t\t\t\tthis.Reveal.slideContent.layout( slide );\n\n\t\t\t\tif( slide.slideBackgroundElement ) {\n\t\t\t\t\tpage.insertBefore( slide.slideBackgroundElement, slide );\n\t\t\t\t}\n\n\t\t\t\t// Inject notes if `showNotes` is enabled\n\t\t\t\tif( config.showNotes ) {\n\n\t\t\t\t\t// Are there notes for this slide?\n\t\t\t\t\tconst notes = this.Reveal.getSlideNotes( slide );\n\t\t\t\t\tif( notes ) {\n\n\t\t\t\t\t\tconst notesSpacing = 8;\n\t\t\t\t\t\tconst notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';\n\t\t\t\t\t\tconst notesElement = document.createElement( 'div' );\n\t\t\t\t\t\tnotesElement.classList.add( 'speaker-notes' );\n\t\t\t\t\t\tnotesElement.classList.add( 'speaker-notes-pdf' );\n\t\t\t\t\t\tnotesElement.setAttribute( 'data-layout', notesLayout );\n\t\t\t\t\t\tnotesElement.innerHTML = notes;\n\n\t\t\t\t\t\tif( notesLayout === 'separate-page' ) {\n\t\t\t\t\t\t\tpages.push( notesElement );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tnotesElement.style.left = notesSpacing + 'px';\n\t\t\t\t\t\t\tnotesElement.style.bottom = notesSpacing + 'px';\n\t\t\t\t\t\t\tnotesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';\n\t\t\t\t\t\t\tpage.appendChild( notesElement );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\t// Inject page numbers if `slideNumbers` are enabled\n\t\t\t\tif( injectPageNumbers ) {\n\t\t\t\t\tconst numberElement = document.createElement( 'div' );\n\t\t\t\t\tnumberElement.classList.add( 'slide-number' );\n\t\t\t\t\tnumberElement.classList.add( 'slide-number-pdf' );\n\t\t\t\t\tnumberElement.innerHTML = slideNumber++;\n\t\t\t\t\tpage.appendChild( numberElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy page and show fragments one after another\n\t\t\t\tif( config.pdfSeparateFragments ) {\n\n\t\t\t\t\t// Each fragment 'group' is an array containing one or more\n\t\t\t\t\t// fragments. Multiple fragments that appear at the same time\n\t\t\t\t\t// are part of the same group.\n\t\t\t\t\tconst fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );\n\n\t\t\t\t\tlet previousFragmentStep;\n\n\t\t\t\t\tfragmentGroups.forEach( function( fragments, index ) {\n\n\t\t\t\t\t\t// Remove 'current-fragment' from the previous group\n\t\t\t\t\t\tif( previousFragmentStep ) {\n\t\t\t\t\t\t\tpreviousFragmentStep.forEach( function( fragment ) {\n\t\t\t\t\t\t\t\tfragment.classList.remove( 'current-fragment' );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\t// Show the fragments for the current index\n\t\t\t\t\t\tfragments.forEach( function( fragment ) {\n\t\t\t\t\t\t\tfragment.classList.add( 'visible', 'current-fragment' );\n\t\t\t\t\t\t}, this );\n\n\t\t\t\t\t\t// Create a separate page for the current fragment state\n\t\t\t\t\t\tconst clonedPage = page.cloneNode( true );\n\n\t\t\t\t\t\t// Inject unique page numbers for fragments\n\t\t\t\t\t\tif( injectPageNumbers ) {\n\t\t\t\t\t\t\tconst numberElement = clonedPage.querySelector( '.slide-number-pdf' );\n\t\t\t\t\t\t\tconst fragmentNumber = index + 1;\n\t\t\t\t\t\t\tnumberElement.innerHTML += '.' + fragmentNumber;\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tpages.push( clonedPage );\n\n\t\t\t\t\t\tpreviousFragmentStep = fragments;\n\n\t\t\t\t\t}, this );\n\n\t\t\t\t\t// Reset the first/original page so that all fragments are hidden\n\t\t\t\t\tfragmentGroups.forEach( function( fragments ) {\n\t\t\t\t\t\tfragments.forEach( function( fragment ) {\n\t\t\t\t\t\t\tfragment.classList.remove( 'visible', 'current-fragment' );\n\t\t\t\t\t\t} );\n\t\t\t\t\t} );\n\n\t\t\t\t}\n\t\t\t\t// Show all fragments\n\t\t\t\telse {\n\t\t\t\t\tqueryAll( page, '.fragment:not(.fade-out)' ).forEach( function( fragment ) {\n\t\t\t\t\t\tfragment.classList.add( 'visible' );\n\t\t\t\t\t} );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}, this );\n\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\tpages.forEach( page => pageContainer.appendChild( page ) );\n\n\t\t// Re-run JS-based content layout after the slide is added to page DOM\n\t\tthis.Reveal.slideContent.layout( this.Reveal.getSlidesElement() );\n\n\t\t// Notify subscribers that the PDF layout is good to go\n\t\tthis.Reveal.dispatchEvent({ type: 'pdf-ready' });\n\n\t}\n\n\t/**\n\t * Checks if this instance is being used to print a PDF.\n\t */\n\tisPrintingPDF() {\n\n\t\treturn ( /print-pdf/gi ).test( window.location.search );\n\n\t}\n\n}\n","import { isAndroid } from '../utils/device.js'\nimport { matches } from '../utils/util.js'\n\nconst SWIPE_THRESHOLD = 40;\n\n/**\n * Controls all touch interactions and navigations for\n * a presentation.\n */\nexport default class Touch {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Holds information about the currently ongoing touch interaction\n\t\tthis.touchStartX = 0;\n\t\tthis.touchStartY = 0;\n\t\tthis.touchStartCount = 0;\n\t\tthis.touchCaptured = false;\n\n\t\tthis.onPointerDown = this.onPointerDown.bind( this );\n\t\tthis.onPointerMove = this.onPointerMove.bind( this );\n\t\tthis.onPointerUp = this.onPointerUp.bind( this );\n\t\tthis.onTouchStart = this.onTouchStart.bind( this );\n\t\tthis.onTouchMove = this.onTouchMove.bind( this );\n\t\tthis.onTouchEnd = this.onTouchEnd.bind( this );\n\n\t}\n\n\t/**\n\t *\n\t */\n\tbind() {\n\n\t\tlet revealElement = this.Reveal.getRevealElement();\n\n\t\tif( 'onpointerdown' in window ) {\n\t\t\t// Use W3C pointer events\n\t\t\trevealElement.addEventListener( 'pointerdown', this.onPointerDown, false );\n\t\t\trevealElement.addEventListener( 'pointermove', this.onPointerMove, false );\n\t\t\trevealElement.addEventListener( 'pointerup', this.onPointerUp, false );\n\t\t}\n\t\telse if( window.navigator.msPointerEnabled ) {\n\t\t\t// IE 10 uses prefixed version of pointer events\n\t\t\trevealElement.addEventListener( 'MSPointerDown', this.onPointerDown, false );\n\t\t\trevealElement.addEventListener( 'MSPointerMove', this.onPointerMove, false );\n\t\t\trevealElement.addEventListener( 'MSPointerUp', this.onPointerUp, false );\n\t\t}\n\t\telse {\n\t\t\t// Fall back to touch events\n\t\t\trevealElement.addEventListener( 'touchstart', this.onTouchStart, false );\n\t\t\trevealElement.addEventListener( 'touchmove', this.onTouchMove, false );\n\t\t\trevealElement.addEventListener( 'touchend', this.onTouchEnd, false );\n\t\t}\n\n\t}\n\n\t/**\n\t *\n\t */\n\tunbind() {\n\n\t\tlet revealElement = this.Reveal.getRevealElement();\n\n\t\trevealElement.removeEventListener( 'pointerdown', this.onPointerDown, false );\n\t\trevealElement.removeEventListener( 'pointermove', this.onPointerMove, false );\n\t\trevealElement.removeEventListener( 'pointerup', this.onPointerUp, false );\n\n\t\trevealElement.removeEventListener( 'MSPointerDown', this.onPointerDown, false );\n\t\trevealElement.removeEventListener( 'MSPointerMove', this.onPointerMove, false );\n\t\trevealElement.removeEventListener( 'MSPointerUp', this.onPointerUp, false );\n\n\t\trevealElement.removeEventListener( 'touchstart', this.onTouchStart, false );\n\t\trevealElement.removeEventListener( 'touchmove', this.onTouchMove, false );\n\t\trevealElement.removeEventListener( 'touchend', this.onTouchEnd, false );\n\n\t}\n\n\t/**\n\t * Checks if the target element prevents the triggering of\n\t * swipe navigation.\n\t */\n\tisSwipePrevented( target ) {\n\n\t\t// Prevent accidental swipes when scrubbing timelines\n\t\tif( matches( target, 'video, audio' ) ) return true;\n\n\t\twhile( target && typeof target.hasAttribute === 'function' ) {\n\t\t\tif( target.hasAttribute( 'data-prevent-swipe' ) ) return true;\n\t\t\ttarget = target.parentNode;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Handler for the 'touchstart' event, enables support for\n\t * swipe and pinch gestures.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchStart( event ) {\n\n\t\tif( this.isSwipePrevented( event.target ) ) return true;\n\n\t\tthis.touchStartX = event.touches[0].clientX;\n\t\tthis.touchStartY = event.touches[0].clientY;\n\t\tthis.touchStartCount = event.touches.length;\n\n\t}\n\n\t/**\n\t * Handler for the 'touchmove' event.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchMove( event ) {\n\n\t\tif( this.isSwipePrevented( event.target ) ) return true;\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\t// Each touch should only trigger one action\n\t\tif( !this.touchCaptured ) {\n\t\t\tthis.Reveal.onUserInput( event );\n\n\t\t\tlet currentX = event.touches[0].clientX;\n\t\t\tlet currentY = event.touches[0].clientY;\n\n\t\t\t// There was only one touch point, look for a swipe\n\t\t\tif( event.touches.length === 1 && this.touchStartCount !== 2 ) {\n\n\t\t\t\tlet availableRoutes = this.Reveal.availableRoutes({ includeFragments: true });\n\n\t\t\t\tlet deltaX = currentX - this.touchStartX,\n\t\t\t\t\tdeltaY = currentY - this.touchStartY;\n\n\t\t\t\tif( deltaX > SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tif( config.rtl ) {\n\t\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.left();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaX < -SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tif( config.rtl ) {\n\t\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.right();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaY > SWIPE_THRESHOLD && availableRoutes.up ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.up();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaY < -SWIPE_THRESHOLD && availableRoutes.down ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.down();\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// If we're embedded, only block touch events if they have\n\t\t\t\t// triggered an action\n\t\t\t\tif( config.embedded ) {\n\t\t\t\t\tif( this.touchCaptured || this.Reveal.isVerticalSlide() ) {\n\t\t\t\t\t\tevent.preventDefault();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Not embedded? Block them all to avoid needless tossing\n\t\t\t\t// around of the viewport in iOS\n\t\t\t\telse {\n\t\t\t\t\tevent.preventDefault();\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\t\t// There's a bug with swiping on some Android devices unless\n\t\t// the default action is always prevented\n\t\telse if( isAndroid ) {\n\t\t\tevent.preventDefault();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the 'touchend' event.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchEnd( event ) {\n\n\t\tthis.touchCaptured = false;\n\n\t}\n\n\t/**\n\t * Convert pointer down to touch start.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerDown( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" ) {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchStart( event );\n\t\t}\n\n\t}\n\n\t/**\n\t * Convert pointer move to touch move.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerMove( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" )  {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchMove( event );\n\t\t}\n\n\t}\n\n\t/**\n\t * Convert pointer up to touch end.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerUp( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" )  {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchEnd( event );\n\t\t}\n\n\t}\n\n}","import { closest } from '../utils/util.js'\n\n/**\n * Manages focus when a presentation is embedded. This\n * helps us only capture keyboard from the presentation\n * a user is currently interacting with in a page where\n * multiple presentations are embedded.\n */\n\nconst STATE_FOCUS = 'focus';\nconst STATE_BLUR = 'blur';\n\nexport default class Focus {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onRevealPointerDown = this.onRevealPointerDown.bind( this );\n\t\tthis.onDocumentPointerDown = this.onDocumentPointerDown.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.embedded ) {\n\t\t\tthis.blur();\n\t\t}\n\t\telse {\n\t\t\tthis.focus();\n\t\t\tthis.unbind();\n\t\t}\n\n\t}\n\n\tbind() {\n\n\t\tif( this.Reveal.getConfig().embedded ) {\n\t\t\tthis.Reveal.getRevealElement().addEventListener( 'pointerdown', this.onRevealPointerDown, false );\n\t\t}\n\n\t}\n\n\tunbind() {\n\n\t\tthis.Reveal.getRevealElement().removeEventListener( 'pointerdown', this.onRevealPointerDown, false );\n\t\tdocument.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\n\t}\n\n\tfocus() {\n\n\t\tif( this.state !== STATE_FOCUS ) {\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'focused' );\n\t\t\tdocument.addEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\t\t}\n\n\t\tthis.state = STATE_FOCUS;\n\n\t}\n\n\tblur() {\n\n\t\tif( this.state !== STATE_BLUR ) {\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'focused' );\n\t\t\tdocument.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\t\t}\n\n\t\tthis.state = STATE_BLUR;\n\n\t}\n\n\tisFocused() {\n\n\t\treturn this.state === STATE_FOCUS;\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.Reveal.getRevealElement().classList.remove( 'focused' );\n\n\t}\n\n\tonRevealPointerDown( event ) {\n\n\t\tthis.focus();\n\n\t}\n\n\tonDocumentPointerDown( event ) {\n\n\t\tlet revealElement = closest( event.target, '.reveal' );\n\t\tif( !revealElement || revealElement !== this.Reveal.getRevealElement() ) {\n\t\t\tthis.blur();\n\t\t}\n\n\t}\n\n}","/**\n * Handles the showing and \n */\nexport default class Notes {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'speaker-notes';\n\t\tthis.element.setAttribute( 'data-prevent-swipe', '' );\n\t\tthis.element.setAttribute( 'tabindex', '0' );\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.showNotes ) {\n\t\t\tthis.element.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Pick up notes from the current slide and display them\n\t * to the viewer.\n\t *\n\t * @see {@link config.showNotes}\n\t */\n\tupdate() {\n\n\t\tif( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) {\n\n\t\t\tthis.element.innerHTML = this.getSlideNotes() || '<span class=\"notes-placeholder\">No notes on this slide.</span>';\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the visibility of the speaker notes sidebar that\n\t * is used to share annotated slides. The notes sidebar is\n\t * only visible if showNotes is true and there are notes on\n\t * one or more slides in the deck.\n\t */\n\tupdateVisibility() {\n\n\t\tif( this.Reveal.getConfig().showNotes && this.hasNotes() && !this.Reveal.print.isPrintingPDF() ) {\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'show-notes' );\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'show-notes' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if there are speaker notes for ANY slide in the\n\t * presentation.\n\t */\n\thasNotes() {\n\n\t\treturn this.Reveal.getSlidesElement().querySelectorAll( '[data-notes], aside.notes' ).length > 0;\n\n\t}\n\n\t/**\n\t * Checks if this presentation is running inside of the\n\t * speaker notes window.\n\t *\n\t * @return {boolean}\n\t */\n\tisSpeakerNotesWindow() {\n\n\t\treturn !!window.location.search.match( /receiver/gi );\n\n\t}\n\n\t/**\n\t * Retrieves the speaker notes from a slide. Notes can be\n\t * defined in two ways:\n\t * 1. As a data-notes attribute on the slide <section>\n\t * 2. As an <aside class=\"notes\"> inside of the slide\n\t *\n\t * @param {HTMLElement} [slide=currentSlide]\n\t * @return {(string|null)}\n\t */\n\tgetSlideNotes( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\t// Notes can be specified via the data-notes attribute...\n\t\tif( slide.hasAttribute( 'data-notes' ) ) {\n\t\t\treturn slide.getAttribute( 'data-notes' );\n\t\t}\n\n\t\t// ... or using an <aside class=\"notes\"> element\n\t\tlet notesElement = slide.querySelector( 'aside.notes' );\n\t\tif( notesElement ) {\n\t\t\treturn notesElement.innerHTML;\n\t\t}\n\n\t\treturn null;\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","/**\n * UI component that lets the use control auto-slide\n * playback via play/pause.\n */\nexport default class Playback {\n\n\t/**\n\t * @param {HTMLElement} container The component will append\n\t * itself to this\n\t * @param {function} progressCheck A method which will be\n\t * called frequently to get the current playback progress on\n\t * a range of 0-1\n\t */\n\tconstructor( container, progressCheck ) {\n\n\t\t// Cosmetics\n\t\tthis.diameter = 100;\n\t\tthis.diameter2 = this.diameter/2;\n\t\tthis.thickness = 6;\n\n\t\t// Flags if we are currently playing\n\t\tthis.playing = false;\n\n\t\t// Current progress on a 0-1 range\n\t\tthis.progress = 0;\n\n\t\t// Used to loop the animation smoothly\n\t\tthis.progressOffset = 1;\n\n\t\tthis.container = container;\n\t\tthis.progressCheck = progressCheck;\n\n\t\tthis.canvas = document.createElement( 'canvas' );\n\t\tthis.canvas.className = 'playback';\n\t\tthis.canvas.width = this.diameter;\n\t\tthis.canvas.height = this.diameter;\n\t\tthis.canvas.style.width = this.diameter2 + 'px';\n\t\tthis.canvas.style.height = this.diameter2 + 'px';\n\t\tthis.context = this.canvas.getContext( '2d' );\n\n\t\tthis.container.appendChild( this.canvas );\n\n\t\tthis.render();\n\n\t}\n\n\tsetPlaying( value ) {\n\n\t\tconst wasPlaying = this.playing;\n\n\t\tthis.playing = value;\n\n\t\t// Start repainting if we weren't already\n\t\tif( !wasPlaying && this.playing ) {\n\t\t\tthis.animate();\n\t\t}\n\t\telse {\n\t\t\tthis.render();\n\t\t}\n\n\t}\n\n\tanimate() {\n\n\t\tconst progressBefore = this.progress;\n\n\t\tthis.progress = this.progressCheck();\n\n\t\t// When we loop, offset the progress so that it eases\n\t\t// smoothly rather than immediately resetting\n\t\tif( progressBefore > 0.8 && this.progress < 0.2 ) {\n\t\t\tthis.progressOffset = this.progress;\n\t\t}\n\n\t\tthis.render();\n\n\t\tif( this.playing ) {\n\t\t\trequestAnimationFrame( this.animate.bind( this ) );\n\t\t}\n\n\t}\n\n\t/**\n\t * Renders the current progress and playback state.\n\t */\n\trender() {\n\n\t\tlet progress = this.playing ? this.progress : 0,\n\t\t\tradius = ( this.diameter2 ) - this.thickness,\n\t\t\tx = this.diameter2,\n\t\t\ty = this.diameter2,\n\t\t\ticonSize = 28;\n\n\t\t// Ease towards 1\n\t\tthis.progressOffset += ( 1 - this.progressOffset ) * 0.1;\n\n\t\tconst endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );\n\t\tconst startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );\n\n\t\tthis.context.save();\n\t\tthis.context.clearRect( 0, 0, this.diameter, this.diameter );\n\n\t\t// Solid background color\n\t\tthis.context.beginPath();\n\t\tthis.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );\n\t\tthis.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';\n\t\tthis.context.fill();\n\n\t\t// Draw progress track\n\t\tthis.context.beginPath();\n\t\tthis.context.arc( x, y, radius, 0, Math.PI * 2, false );\n\t\tthis.context.lineWidth = this.thickness;\n\t\tthis.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';\n\t\tthis.context.stroke();\n\n\t\tif( this.playing ) {\n\t\t\t// Draw progress on top of track\n\t\t\tthis.context.beginPath();\n\t\t\tthis.context.arc( x, y, radius, startAngle, endAngle, false );\n\t\t\tthis.context.lineWidth = this.thickness;\n\t\t\tthis.context.strokeStyle = '#fff';\n\t\t\tthis.context.stroke();\n\t\t}\n\n\t\tthis.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );\n\n\t\t// Draw play/pause icons\n\t\tif( this.playing ) {\n\t\t\tthis.context.fillStyle = '#fff';\n\t\t\tthis.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );\n\t\t\tthis.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );\n\t\t}\n\t\telse {\n\t\t\tthis.context.beginPath();\n\t\t\tthis.context.translate( 4, 0 );\n\t\t\tthis.context.moveTo( 0, 0 );\n\t\t\tthis.context.lineTo( iconSize - 4, iconSize / 2 );\n\t\t\tthis.context.lineTo( 0, iconSize );\n\t\t\tthis.context.fillStyle = '#fff';\n\t\t\tthis.context.fill();\n\t\t}\n\n\t\tthis.context.restore();\n\n\t}\n\n\ton( type, listener ) {\n\t\tthis.canvas.addEventListener( type, listener, false );\n\t}\n\n\toff( type, listener ) {\n\t\tthis.canvas.removeEventListener( type, listener, false );\n\t}\n\n\tdestroy() {\n\n\t\tthis.playing = false;\n\n\t\tif( this.canvas.parentNode ) {\n\t\t\tthis.container.removeChild( this.canvas );\n\t\t}\n\n\t}\n\n}","/**\n * The default reveal.js config object.\n */\nexport default {\n\n\t// The \"normal\" size of the presentation, aspect ratio will be preserved\n\t// when the presentation is scaled to fit different resolutions\n\twidth: 960,\n\theight: 700,\n\n\t// Factor of the display size that should remain empty around the content\n\tmargin: 0.04,\n\n\t// Bounds for smallest/largest possible scale to apply to content\n\tminScale: 0.2,\n\tmaxScale: 2.0,\n\n\t// Display presentation control arrows\n\tcontrols: true,\n\n\t// Help the user learn the controls by providing hints, for example by\n\t// bouncing the down arrow when they first encounter a vertical slide\n\tcontrolsTutorial: true,\n\n\t// Determines where controls appear, \"edges\" or \"bottom-right\"\n\tcontrolsLayout: 'bottom-right',\n\n\t// Visibility rule for backwards navigation arrows; \"faded\", \"hidden\"\n\t// or \"visible\"\n\tcontrolsBackArrows: 'faded',\n\n\t// Display a presentation progress bar\n\tprogress: true,\n\n\t// Display the page number of the current slide\n\t// - true:    Show slide number\n\t// - false:   Hide slide number\n\t//\n\t// Can optionally be set as a string that specifies the number formatting:\n\t// - \"h.v\":\t  Horizontal . vertical slide number (default)\n\t// - \"h/v\":\t  Horizontal / vertical slide number\n\t// - \"c\":\t  Flattened slide number\n\t// - \"c/t\":\t  Flattened slide number / total slides\n\t//\n\t// Alternatively, you can provide a function that returns the slide\n\t// number for the current slide. The function should take in a slide\n\t// object and return an array with one string [slideNumber] or\n\t// three strings [n1,delimiter,n2]. See #formatSlideNumber().\n\tslideNumber: false,\n\n\t// Can be used to limit the contexts in which the slide number appears\n\t// - \"all\":      Always show the slide number\n\t// - \"print\":    Only when printing to PDF\n\t// - \"speaker\":  Only in the speaker view\n\tshowSlideNumber: 'all',\n\n\t// Use 1 based indexing for # links to match slide number (default is zero\n\t// based)\n\thashOneBasedIndex: false,\n\n\t// Add the current slide number to the URL hash so that reloading the\n\t// page/copying the URL will return you to the same slide\n\thash: false,\n\n\t// Flags if we should monitor the hash and change slides accordingly\n\trespondToHashChanges: true,\n\n\t// Push each slide change to the browser history.  Implies `hash: true`\n\thistory: false,\n\n\t// Enable keyboard shortcuts for navigation\n\tkeyboard: true,\n\n\t// Optional function that blocks keyboard events when retuning false\n\t//\n\t// If you set this to 'focused', we will only capture keyboard events\n\t// for embedded decks when they are in focus\n\tkeyboardCondition: null,\n\n\t// Disables the default reveal.js slide layout (scaling and centering)\n\t// so that you can use custom CSS layout\n\tdisableLayout: false,\n\n\t// Enable the slide overview mode\n\toverview: true,\n\n\t// Vertical centering of slides\n\tcenter: true,\n\n\t// Enables touch navigation on devices with touch input\n\ttouch: true,\n\n\t// Loop the presentation\n\tloop: false,\n\n\t// Change the presentation direction to be RTL\n\trtl: false,\n\n\t// Changes the behavior of our navigation directions.\n\t//\n\t// \"default\"\n\t// Left/right arrow keys step between horizontal slides, up/down\n\t// arrow keys step between vertical slides. Space key steps through\n\t// all slides (both horizontal and vertical).\n\t//\n\t// \"linear\"\n\t// Removes the up/down arrows. Left/right arrows step through all\n\t// slides (both horizontal and vertical).\n\t//\n\t// \"grid\"\n\t// When this is enabled, stepping left/right from a vertical stack\n\t// to an adjacent vertical stack will land you at the same vertical\n\t// index.\n\t//\n\t// Consider a deck with six slides ordered in two vertical stacks:\n\t// 1.1    2.1\n\t// 1.2    2.2\n\t// 1.3    2.3\n\t//\n\t// If you're on slide 1.3 and navigate right, you will normally move\n\t// from 1.3 -> 2.1. If \"grid\" is used, the same navigation takes you\n\t// from 1.3 -> 2.3.\n\tnavigationMode: 'default',\n\n\t// Randomizes the order of slides each time the presentation loads\n\tshuffle: false,\n\n\t// Turns fragments on and off globally\n\tfragments: true,\n\n\t// Flags whether to include the current fragment in the URL,\n\t// so that reloading brings you to the same fragment position\n\tfragmentInURL: true,\n\n\t// Flags if the presentation is running in an embedded mode,\n\t// i.e. contained within a limited portion of the screen\n\tembedded: false,\n\n\t// Flags if we should show a help overlay when the question-mark\n\t// key is pressed\n\thelp: true,\n\n\t// Flags if it should be possible to pause the presentation (blackout)\n\tpause: true,\n\n\t// Flags if speaker notes should be visible to all viewers\n\tshowNotes: false,\n\n\t// Flags if slides with data-visibility=\"hidden\" should be kep visible\n\tshowHiddenSlides: false,\n\n\t// Global override for autoplaying embedded media (video/audio/iframe)\n\t// - null:   Media will only autoplay if data-autoplay is present\n\t// - true:   All media will autoplay, regardless of individual setting\n\t// - false:  No media will autoplay, regardless of individual setting\n\tautoPlayMedia: null,\n\n\t// Global override for preloading lazy-loaded iframes\n\t// - null:   Iframes with data-src AND data-preload will be loaded when within\n\t//           the viewDistance, iframes with only data-src will be loaded when visible\n\t// - true:   All iframes with data-src will be loaded when within the viewDistance\n\t// - false:  All iframes with data-src will be loaded only when visible\n\tpreloadIframes: null,\n\n\t// Can be used to globally disable auto-animation\n\tautoAnimate: true,\n\n\t// Optionally provide a custom element matcher that will be\n\t// used to dictate which elements we can animate between.\n\tautoAnimateMatcher: null,\n\n\t// Default settings for our auto-animate transitions, can be\n\t// overridden per-slide or per-element via data arguments\n\tautoAnimateEasing: 'ease',\n\tautoAnimateDuration: 1.0,\n\tautoAnimateUnmatched: true,\n\n\t// CSS properties that can be auto-animated. Position & scale\n\t// is matched separately so there's no need to include styles\n\t// like top/right/bottom/left, width/height or margin.\n\tautoAnimateStyles: [\n\t\t'opacity',\n\t\t'color',\n\t\t'background-color',\n\t\t'padding',\n\t\t'font-size',\n\t\t'line-height',\n\t\t'letter-spacing',\n\t\t'border-width',\n\t\t'border-color',\n\t\t'border-radius',\n\t\t'outline',\n\t\t'outline-offset'\n\t],\n\n\t// Controls automatic progression to the next slide\n\t// - 0:      Auto-sliding only happens if the data-autoslide HTML attribute\n\t//           is present on the current slide or fragment\n\t// - 1+:     All slides will progress automatically at the given interval\n\t// - false:  No auto-sliding, even if data-autoslide is present\n\tautoSlide: 0,\n\n\t// Stop auto-sliding after user input\n\tautoSlideStoppable: true,\n\n\t// Use this method for navigation when auto-sliding (defaults to navigateNext)\n\tautoSlideMethod: null,\n\n\t// Specify the average time in seconds that you think you will spend\n\t// presenting each slide. This is used to show a pacing timer in the\n\t// speaker view\n\tdefaultTiming: null,\n\n\t// Enable slide navigation via mouse wheel\n\tmouseWheel: false,\n\n\t// Opens links in an iframe preview overlay\n\t// Add `data-preview-link` and `data-preview-link=\"false\"` to customise each link\n\t// individually\n\tpreviewLinks: false,\n\n\t// Exposes the reveal.js API through window.postMessage\n\tpostMessage: true,\n\n\t// Dispatches all reveal.js events to the parent window through postMessage\n\tpostMessageEvents: false,\n\n\t// Focuses body when page changes visibility to ensure keyboard shortcuts work\n\tfocusBodyOnPageVisibilityChange: true,\n\n\t// Transition style\n\ttransition: 'slide', // none/fade/slide/convex/concave/zoom\n\n\t// Transition speed\n\ttransitionSpeed: 'default', // default/fast/slow\n\n\t// Transition style for full page slide backgrounds\n\tbackgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom\n\n\t// Parallax background image\n\tparallaxBackgroundImage: '', // CSS syntax, e.g. \"a.jpg\"\n\n\t// Parallax background size\n\tparallaxBackgroundSize: '', // CSS syntax, e.g. \"3000px 2000px\"\n\n\t// Parallax background repeat\n\tparallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit\n\n\t// Parallax background position\n\tparallaxBackgroundPosition: '', // CSS syntax, e.g. \"top left\"\n\n\t// Amount of pixels to move the parallax background per slide step\n\tparallaxBackgroundHorizontal: null,\n\tparallaxBackgroundVertical: null,\n\n\t// The maximum number of pages a single slide can expand onto when printing\n\t// to PDF, unlimited by default\n\tpdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,\n\n\t// Prints each fragment on a separate slide\n\tpdfSeparateFragments: true,\n\n\t// Offset used to reduce the height of content within exported PDF pages.\n\t// This exists to account for environment differences based on how you\n\t// print to PDF. CLI printing options, like phantomjs and wkpdf, can end\n\t// on precisely the total height of the document whereas in-browser\n\t// printing has to end one pixel before.\n\tpdfPageHeightOffset: -1,\n\n\t// Number of slides away from the current that are visible\n\tviewDistance: 3,\n\n\t// Number of slides away from the current that are visible on mobile\n\t// devices. It is advisable to set this to a lower number than\n\t// viewDistance in order to save resources.\n\tmobileViewDistance: 2,\n\n\t// The display mode that will be used to show slides\n\tdisplay: 'block',\n\n\t// Hide cursor if inactive\n\thideInactiveCursor: true,\n\n\t// Time before the cursor is hidden (in ms)\n\thideCursorTime: 5000,\n\n\t// Script dependencies to load\n\tdependencies: [],\n\n\t// Plugin objects to register and use for this presentation\n\tplugins: []\n\n}","import SlideContent from './controllers/slidecontent.js'\nimport SlideNumber from './controllers/slidenumber.js'\nimport Backgrounds from './controllers/backgrounds.js'\nimport AutoAnimate from './controllers/autoanimate.js'\nimport Fragments from './controllers/fragments.js'\nimport Overview from './controllers/overview.js'\nimport Keyboard from './controllers/keyboard.js'\nimport Location from './controllers/location.js'\nimport Controls from './controllers/controls.js'\nimport Progress from './controllers/progress.js'\nimport Pointer from './controllers/pointer.js'\nimport Plugins from './controllers/plugins.js'\nimport Print from './controllers/print.js'\nimport Touch from './controllers/touch.js'\nimport Focus from './controllers/focus.js'\nimport Notes from './controllers/notes.js'\nimport Playback from './components/playback.js'\nimport defaultConfig from './config.js'\nimport * as Util from './utils/util.js'\nimport * as Device from './utils/device.js'\nimport {\n\tSLIDES_SELECTOR,\n\tHORIZONTAL_SLIDES_SELECTOR,\n\tVERTICAL_SLIDES_SELECTOR,\n\tPOST_MESSAGE_METHOD_BLACKLIST\n} from './utils/constants.js'\n\n// The reveal.js version\nexport const VERSION = '4.3.1';\n\n/**\n * reveal.js\n * https://revealjs.com\n * MIT licensed\n *\n * Copyright (C) 2011-2022 Hakim El Hattab, https://hakim.se\n */\nexport default function( revealElement, options ) {\n\n\t// Support initialization with no args, one arg\n\t// [options] or two args [revealElement, options]\n\tif( arguments.length < 2 ) {\n\t\toptions = arguments[0];\n\t\trevealElement = document.querySelector( '.reveal' );\n\t}\n\n\tconst Reveal = {};\n\n\t// Configuration defaults, can be overridden at initialization time\n\tlet config = {},\n\n\t\t// Flags if reveal.js is loaded (has dispatched the 'ready' event)\n\t\tready = false,\n\n\t\t// The horizontal and vertical index of the currently active slide\n\t\tindexh,\n\t\tindexv,\n\n\t\t// The previous and current slide HTML elements\n\t\tpreviousSlide,\n\t\tcurrentSlide,\n\n\t\t// Remember which directions that the user has navigated towards\n\t\tnavigationHistory = {\n\t\t\thasNavigatedHorizontally: false,\n\t\t\thasNavigatedVertically: false\n\t\t},\n\n\t\t// Slides may have a data-state attribute which we pick up and apply\n\t\t// as a class to the body. This list contains the combined state of\n\t\t// all current slides.\n\t\tstate = [],\n\n\t\t// The current scale of the presentation (see width/height config)\n\t\tscale = 1,\n\n\t\t// CSS transform that is currently applied to the slides container,\n\t\t// split into two groups\n\t\tslidesTransform = { layout: '', overview: '' },\n\n\t\t// Cached references to DOM elements\n\t\tdom = {},\n\n\t\t// Flags if the interaction event listeners are bound\n\t\teventsAreBound = false,\n\n\t\t// The current slide transition state; idle or running\n\t\ttransition = 'idle',\n\n\t\t// The current auto-slide duration\n\t\tautoSlide = 0,\n\n\t\t// Auto slide properties\n\t\tautoSlidePlayer,\n\t\tautoSlideTimeout = 0,\n\t\tautoSlideStartTime = -1,\n\t\tautoSlidePaused = false,\n\n\t\t// Controllers for different aspects of our presentation. They're\n\t\t// all given direct references to this Reveal instance since there\n\t\t// may be multiple presentations running in parallel.\n\t\tslideContent = new SlideContent( Reveal ),\n\t\tslideNumber = new SlideNumber( Reveal ),\n\t\tautoAnimate = new AutoAnimate( Reveal ),\n\t\tbackgrounds = new Backgrounds( Reveal ),\n\t\tfragments = new Fragments( Reveal ),\n\t\toverview = new Overview( Reveal ),\n\t\tkeyboard = new Keyboard( Reveal ),\n\t\tlocation = new Location( Reveal ),\n\t\tcontrols = new Controls( Reveal ),\n\t\tprogress = new Progress( Reveal ),\n\t\tpointer = new Pointer( Reveal ),\n\t\tplugins = new Plugins( Reveal ),\n\t\tprint = new Print( Reveal ),\n\t\tfocus = new Focus( Reveal ),\n\t\ttouch = new Touch( Reveal ),\n\t\tnotes = new Notes( Reveal );\n\n\t/**\n\t * Starts up the presentation.\n\t */\n\tfunction initialize( initOptions ) {\n\n\t\tif( !revealElement ) throw 'Unable to find presentation root (<div class=\"reveal\">).';\n\n\t\t// Cache references to key DOM elements\n\t\tdom.wrapper = revealElement;\n\t\tdom.slides = revealElement.querySelector( '.slides' );\n\n\t\tif( !dom.slides ) throw 'Unable to find slides container (<div class=\"slides\">).';\n\n\t\t// Compose our config object in order of increasing precedence:\n\t\t// 1. Default reveal.js options\n\t\t// 2. Options provided via Reveal.configure() prior to\n\t\t//    initialization\n\t\t// 3. Options passed to the Reveal constructor\n\t\t// 4. Options passed to Reveal.initialize\n\t\t// 5. Query params\n\t\tconfig = { ...defaultConfig, ...config, ...options, ...initOptions, ...Util.getQueryHash() };\n\n\t\tsetViewport();\n\n\t\t// Force a layout when the whole page, incl fonts, has loaded\n\t\twindow.addEventListener( 'load', layout, false );\n\n\t\t// Register plugins and load dependencies, then move on to #start()\n\t\tplugins.load( config.plugins, config.dependencies ).then( start );\n\n\t\treturn new Promise( resolve => Reveal.on( 'ready', resolve ) );\n\n\t}\n\n\t/**\n\t * Encase the presentation in a reveal.js viewport. The\n\t * extent of the viewport differs based on configuration.\n\t */\n\tfunction setViewport() {\n\n\t\t// Embedded decks use the reveal element as their viewport\n\t\tif( config.embedded === true ) {\n\t\t\tdom.viewport = Util.closest( revealElement, '.reveal-viewport' ) || revealElement;\n\t\t}\n\t\t// Full-page decks use the body as their viewport\n\t\telse {\n\t\t\tdom.viewport = document.body;\n\t\t\tdocument.documentElement.classList.add( 'reveal-full-page' );\n\t\t}\n\n\t\tdom.viewport.classList.add( 'reveal-viewport' );\n\n\t}\n\n\t/**\n\t * Starts up reveal.js by binding input events and navigating\n\t * to the current URL deeplink if there is one.\n\t */\n\tfunction start() {\n\n\t\tready = true;\n\n\t\t// Remove slides hidden with data-visibility\n\t\tremoveHiddenSlides();\n\n\t\t// Make sure we've got all the DOM elements we need\n\t\tsetupDOM();\n\n\t\t// Listen to messages posted to this window\n\t\tsetupPostMessage();\n\n\t\t// Prevent the slides from being scrolled out of view\n\t\tsetupScrollPrevention();\n\n\t\t// Adds bindings for fullscreen mode\n\t\tsetupFullscreen();\n\n\t\t// Resets all vertical slides so that only the first is visible\n\t\tresetVerticalSlides();\n\n\t\t// Updates the presentation to match the current configuration values\n\t\tconfigure();\n\n\t\t// Read the initial hash\n\t\tlocation.readURL();\n\n\t\t// Create slide backgrounds\n\t\tbackgrounds.update( true );\n\n\t\t// Notify listeners that the presentation is ready but use a 1ms\n\t\t// timeout to ensure it's not fired synchronously after #initialize()\n\t\tsetTimeout( () => {\n\t\t\t// Enable transitions now that we're loaded\n\t\t\tdom.slides.classList.remove( 'no-transition' );\n\n\t\t\tdom.wrapper.classList.add( 'ready' );\n\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'ready',\n\t\t\t\tdata: {\n\t\t\t\t\tindexh,\n\t\t\t\t\tindexv,\n\t\t\t\t\tcurrentSlide\n\t\t\t\t}\n\t\t\t});\n\t\t}, 1 );\n\n\t\t// Special setup and config is required when printing to PDF\n\t\tif( print.isPrintingPDF() ) {\n\t\t\tremoveEventListeners();\n\n\t\t\t// The document needs to have loaded for the PDF layout\n\t\t\t// measurements to be accurate\n\t\t\tif( document.readyState === 'complete' ) {\n\t\t\t\tprint.setupPDF();\n\t\t\t}\n\t\t\telse {\n\t\t\t\twindow.addEventListener( 'load', () => {\n\t\t\t\t\tprint.setupPDF();\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Removes all slides with data-visibility=\"hidden\". This\n\t * is done right before the rest of the presentation is\n\t * initialized.\n\t *\n\t * If you want to show all hidden slides, initialize\n\t * reveal.js with showHiddenSlides set to true.\n\t */\n\tfunction removeHiddenSlides() {\n\n\t\tif( !config.showHiddenSlides ) {\n\t\t\tUtil.queryAll( dom.wrapper, 'section[data-visibility=\"hidden\"]' ).forEach( slide => {\n\t\t\t\tslide.parentNode.removeChild( slide );\n\t\t\t} );\n\t\t}\n\n\t}\n\n\t/**\n\t * Finds and stores references to DOM elements which are\n\t * required by the presentation. If a required element is\n\t * not found, it is created.\n\t */\n\tfunction setupDOM() {\n\n\t\t// Prevent transitions while we're loading\n\t\tdom.slides.classList.add( 'no-transition' );\n\n\t\tif( Device.isMobile ) {\n\t\t\tdom.wrapper.classList.add( 'no-hover' );\n\t\t}\n\t\telse {\n\t\t\tdom.wrapper.classList.remove( 'no-hover' );\n\t\t}\n\n\t\tbackgrounds.render();\n\t\tslideNumber.render();\n\t\tcontrols.render();\n\t\tprogress.render();\n\t\tnotes.render();\n\n\t\t// Overlay graphic which is displayed during the paused mode\n\t\tdom.pauseOverlay = Util.createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class=\"resume-button\">Resume presentation</button>' : null );\n\n\t\tdom.statusElement = createStatusElement();\n\n\t\tdom.wrapper.setAttribute( 'role', 'application' );\n\t}\n\n\t/**\n\t * Creates a hidden div with role aria-live to announce the\n\t * current slide content. Hide the div off-screen to make it\n\t * available only to Assistive Technologies.\n\t *\n\t * @return {HTMLElement}\n\t */\n\tfunction createStatusElement() {\n\n\t\tlet statusElement = dom.wrapper.querySelector( '.aria-status' );\n\t\tif( !statusElement ) {\n\t\t\tstatusElement = document.createElement( 'div' );\n\t\t\tstatusElement.style.position = 'absolute';\n\t\t\tstatusElement.style.height = '1px';\n\t\t\tstatusElement.style.width = '1px';\n\t\t\tstatusElement.style.overflow = 'hidden';\n\t\t\tstatusElement.style.clip = 'rect( 1px, 1px, 1px, 1px )';\n\t\t\tstatusElement.classList.add( 'aria-status' );\n\t\t\tstatusElement.setAttribute( 'aria-live', 'polite' );\n\t\t\tstatusElement.setAttribute( 'aria-atomic','true' );\n\t\t\tdom.wrapper.appendChild( statusElement );\n\t\t}\n\t\treturn statusElement;\n\n\t}\n\n\t/**\n\t * Announces the given text to screen readers.\n\t */\n\tfunction announceStatus( value ) {\n\n\t\tdom.statusElement.textContent = value;\n\n\t}\n\n\t/**\n\t * Converts the given HTML element into a string of text\n\t * that can be announced to a screen reader. Hidden\n\t * elements are excluded.\n\t */\n\tfunction getStatusText( node ) {\n\n\t\tlet text = '';\n\n\t\t// Text node\n\t\tif( node.nodeType === 3 ) {\n\t\t\ttext += node.textContent;\n\t\t}\n\t\t// Element node\n\t\telse if( node.nodeType === 1 ) {\n\n\t\t\tlet isAriaHidden = node.getAttribute( 'aria-hidden' );\n\t\t\tlet isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';\n\t\t\tif( isAriaHidden !== 'true' && !isDisplayHidden ) {\n\n\t\t\t\tArray.from( node.childNodes ).forEach( child => {\n\t\t\t\t\ttext += getStatusText( child );\n\t\t\t\t} );\n\n\t\t\t}\n\n\t\t}\n\n\t\ttext = text.trim();\n\n\t\treturn text === '' ? '' : text + ' ';\n\n\t}\n\n\t/**\n\t * This is an unfortunate necessity. Some actions – such as\n\t * an input field being focused in an iframe or using the\n\t * keyboard to expand text selection beyond the bounds of\n\t * a slide – can trigger our content to be pushed out of view.\n\t * This scrolling can not be prevented by hiding overflow in\n\t * CSS (we already do) so we have to resort to repeatedly\n\t * checking if the slides have been offset :(\n\t */\n\tfunction setupScrollPrevention() {\n\n\t\tsetInterval( () => {\n\t\t\tif( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {\n\t\t\t\tdom.wrapper.scrollTop = 0;\n\t\t\t\tdom.wrapper.scrollLeft = 0;\n\t\t\t}\n\t\t}, 1000 );\n\n\t}\n\n\t/**\n\t * After entering fullscreen we need to force a layout to\n\t * get our presentations to scale correctly. This behavior\n\t * is inconsistent across browsers but a force layout seems\n\t * to normalize it.\n\t */\n\tfunction setupFullscreen() {\n\n\t\tdocument.addEventListener( 'fullscreenchange', onFullscreenChange );\n\t\tdocument.addEventListener( 'webkitfullscreenchange', onFullscreenChange );\n\n\t}\n\n\t/**\n\t * Registers a listener to postMessage events, this makes it\n\t * possible to call all reveal.js API methods from another\n\t * window. For example:\n\t *\n\t * revealWindow.postMessage( JSON.stringify({\n\t *   method: 'slide',\n\t *   args: [ 2 ]\n\t * }), '*' );\n\t */\n\tfunction setupPostMessage() {\n\n\t\tif( config.postMessage ) {\n\t\t\twindow.addEventListener( 'message', onPostMessage, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Applies the configuration settings from the config\n\t * object. May be called multiple times.\n\t *\n\t * @param {object} options\n\t */\n\tfunction configure( options ) {\n\n\t\tconst oldConfig = { ...config }\n\n\t\t// New config options may be passed when this method\n\t\t// is invoked through the API after initialization\n\t\tif( typeof options === 'object' ) Util.extend( config, options );\n\n\t\t// Abort if reveal.js hasn't finished loading, config\n\t\t// changes will be applied automatically once ready\n\t\tif( Reveal.isReady() ===  false ) return;\n\n\t\tconst numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;\n\n\t\t// The transition is added as a class on the .reveal element\n\t\tdom.wrapper.classList.remove( oldConfig.transition );\n\t\tdom.wrapper.classList.add( config.transition );\n\n\t\tdom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );\n\t\tdom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );\n\n\t\t// Expose our configured slide dimensions as custom props\n\t\tdom.viewport.style.setProperty( '--slide-width', config.width + 'px' );\n\t\tdom.viewport.style.setProperty( '--slide-height', config.height + 'px' );\n\n\t\tif( config.shuffle ) {\n\t\t\tshuffle();\n\t\t}\n\n\t\tUtil.toggleClass( dom.wrapper, 'embedded', config.embedded );\n\t\tUtil.toggleClass( dom.wrapper, 'rtl', config.rtl );\n\t\tUtil.toggleClass( dom.wrapper, 'center', config.center );\n\n\t\t// Exit the paused mode if it was configured off\n\t\tif( config.pause === false ) {\n\t\t\tresume();\n\t\t}\n\n\t\t// Iframe link previews\n\t\tif( config.previewLinks ) {\n\t\t\tenablePreviewLinks();\n\t\t\tdisablePreviewLinks( '[data-preview-link=false]' );\n\t\t}\n\t\telse {\n\t\t\tdisablePreviewLinks();\n\t\t\tenablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );\n\t\t}\n\n\t\t// Reset all changes made by auto-animations\n\t\tautoAnimate.reset();\n\n\t\t// Remove existing auto-slide controls\n\t\tif( autoSlidePlayer ) {\n\t\t\tautoSlidePlayer.destroy();\n\t\t\tautoSlidePlayer = null;\n\t\t}\n\n\t\t// Generate auto-slide controls if needed\n\t\tif( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable ) {\n\t\t\tautoSlidePlayer = new Playback( dom.wrapper, () => {\n\t\t\t\treturn Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );\n\t\t\t} );\n\n\t\t\tautoSlidePlayer.on( 'click', onAutoSlidePlayerClick );\n\t\t\tautoSlidePaused = false;\n\t\t}\n\n\t\t// Add the navigation mode to the DOM so we can adjust styling\n\t\tif( config.navigationMode !== 'default' ) {\n\t\t\tdom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );\n\t\t}\n\t\telse {\n\t\t\tdom.wrapper.removeAttribute( 'data-navigation-mode' );\n\t\t}\n\n\t\tnotes.configure( config, oldConfig );\n\t\tfocus.configure( config, oldConfig );\n\t\tpointer.configure( config, oldConfig );\n\t\tcontrols.configure( config, oldConfig );\n\t\tprogress.configure( config, oldConfig );\n\t\tkeyboard.configure( config, oldConfig );\n\t\tfragments.configure( config, oldConfig );\n\t\tslideNumber.configure( config, oldConfig );\n\n\t\tsync();\n\n\t}\n\n\t/**\n\t * Binds all event listeners.\n\t */\n\tfunction addEventListeners() {\n\n\t\teventsAreBound = true;\n\n\t\twindow.addEventListener( 'resize', onWindowResize, false );\n\n\t\tif( config.touch ) touch.bind();\n\t\tif( config.keyboard ) keyboard.bind();\n\t\tif( config.progress ) progress.bind();\n\t\tif( config.respondToHashChanges ) location.bind();\n\t\tcontrols.bind();\n\t\tfocus.bind();\n\n\t\tdom.slides.addEventListener( 'click', onSlidesClicked, false );\n\t\tdom.slides.addEventListener( 'transitionend', onTransitionEnd, false );\n\t\tdom.pauseOverlay.addEventListener( 'click', resume, false );\n\n\t\tif( config.focusBodyOnPageVisibilityChange ) {\n\t\t\tdocument.addEventListener( 'visibilitychange', onPageVisibilityChange, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Unbinds all event listeners.\n\t */\n\tfunction removeEventListeners() {\n\n\t\teventsAreBound = false;\n\n\t\ttouch.unbind();\n\t\tfocus.unbind();\n\t\tkeyboard.unbind();\n\t\tcontrols.unbind();\n\t\tprogress.unbind();\n\t\tlocation.unbind();\n\n\t\twindow.removeEventListener( 'resize', onWindowResize, false );\n\n\t\tdom.slides.removeEventListener( 'click', onSlidesClicked, false );\n\t\tdom.slides.removeEventListener( 'transitionend', onTransitionEnd, false );\n\t\tdom.pauseOverlay.removeEventListener( 'click', resume, false );\n\n\t}\n\n\t/**\n\t * Uninitializes reveal.js by undoing changes made to the\n\t * DOM and removing all event listeners.\n\t */\n\tfunction destroy() {\n\n\t\tremoveEventListeners();\n\t\tcancelAutoSlide();\n\t\tdisablePreviewLinks();\n\n\t\t// Destroy controllers\n\t\tnotes.destroy();\n\t\tfocus.destroy();\n\t\tplugins.destroy();\n\t\tpointer.destroy();\n\t\tcontrols.destroy();\n\t\tprogress.destroy();\n\t\tbackgrounds.destroy();\n\t\tslideNumber.destroy();\n\n\t\t// Remove event listeners\n\t\tdocument.removeEventListener( 'fullscreenchange', onFullscreenChange );\n\t\tdocument.removeEventListener( 'webkitfullscreenchange', onFullscreenChange );\n\t\tdocument.removeEventListener( 'visibilitychange', onPageVisibilityChange, false );\n\t\twindow.removeEventListener( 'message', onPostMessage, false );\n\t\twindow.removeEventListener( 'load', layout, false );\n\n\t\t// Undo DOM changes\n\t\tif( dom.pauseOverlay ) dom.pauseOverlay.remove();\n\t\tif( dom.statusElement ) dom.statusElement.remove();\n\n\t\tdocument.documentElement.classList.remove( 'reveal-full-page' );\n\n\t\tdom.wrapper.classList.remove( 'ready', 'center', 'has-horizontal-slides', 'has-vertical-slides' );\n\t\tdom.wrapper.removeAttribute( 'data-transition-speed' );\n\t\tdom.wrapper.removeAttribute( 'data-background-transition' );\n\n\t\tdom.viewport.classList.remove( 'reveal-viewport' );\n\t\tdom.viewport.style.removeProperty( '--slide-width' );\n\t\tdom.viewport.style.removeProperty( '--slide-height' );\n\n\t\tdom.slides.style.removeProperty( 'width' );\n\t\tdom.slides.style.removeProperty( 'height' );\n\t\tdom.slides.style.removeProperty( 'zoom' );\n\t\tdom.slides.style.removeProperty( 'left' );\n\t\tdom.slides.style.removeProperty( 'top' );\n\t\tdom.slides.style.removeProperty( 'bottom' );\n\t\tdom.slides.style.removeProperty( 'right' );\n\t\tdom.slides.style.removeProperty( 'transform' );\n\n\t\tArray.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( slide => {\n\t\t\tslide.style.removeProperty( 'display' );\n\t\t\tslide.style.removeProperty( 'top' );\n\t\t\tslide.removeAttribute( 'hidden' );\n\t\t\tslide.removeAttribute( 'aria-hidden' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Adds a listener to one of our custom reveal.js events,\n\t * like slidechanged.\n\t */\n\tfunction on( type, listener, useCapture ) {\n\n\t\trevealElement.addEventListener( type, listener, useCapture );\n\n\t}\n\n\t/**\n\t * Unsubscribes from a reveal.js event.\n\t */\n\tfunction off( type, listener, useCapture ) {\n\n\t\trevealElement.removeEventListener( type, listener, useCapture );\n\n\t}\n\n\t/**\n\t * Applies CSS transforms to the slides container. The container\n\t * is transformed from two separate sources: layout and the overview\n\t * mode.\n\t *\n\t * @param {object} transforms\n\t */\n\tfunction transformSlides( transforms ) {\n\n\t\t// Pick up new transforms from arguments\n\t\tif( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;\n\t\tif( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;\n\n\t\t// Apply the transforms to the slides container\n\t\tif( slidesTransform.layout ) {\n\t\t\tUtil.transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );\n\t\t}\n\t\telse {\n\t\t\tUtil.transformElement( dom.slides, slidesTransform.overview );\n\t\t}\n\n\t}\n\n\t/**\n\t * Dispatches an event of the specified type from the\n\t * reveal DOM element.\n\t */\n\tfunction dispatchEvent({ target=dom.wrapper, type, data, bubbles=true }) {\n\n\t\tlet event = document.createEvent( 'HTMLEvents', 1, 2 );\n\t\tevent.initEvent( type, bubbles, true );\n\t\tUtil.extend( event, data );\n\t\ttarget.dispatchEvent( event );\n\n\t\tif( target === dom.wrapper ) {\n\t\t\t// If we're in an iframe, post each reveal.js event to the\n\t\t\t// parent window. Used by the notes plugin\n\t\t\tdispatchPostMessage( type );\n\t\t}\n\n\t\treturn event;\n\n\t}\n\n\t/**\n\t * Dispatched a postMessage of the given type from our window.\n\t */\n\tfunction dispatchPostMessage( type, data ) {\n\n\t\tif( config.postMessageEvents && window.parent !== window.self ) {\n\t\t\tlet message = {\n\t\t\t\tnamespace: 'reveal',\n\t\t\t\teventName: type,\n\t\t\t\tstate: getState()\n\t\t\t};\n\n\t\t\tUtil.extend( message, data );\n\n\t\t\twindow.parent.postMessage( JSON.stringify( message ), '*' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Bind preview frame links.\n\t *\n\t * @param {string} [selector=a] - selector for anchors\n\t */\n\tfunction enablePreviewLinks( selector = 'a' ) {\n\n\t\tArray.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {\n\t\t\tif( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {\n\t\t\t\telement.addEventListener( 'click', onPreviewLinkClicked, false );\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Unbind preview frame links.\n\t */\n\tfunction disablePreviewLinks( selector = 'a' ) {\n\n\t\tArray.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {\n\t\t\tif( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {\n\t\t\t\telement.removeEventListener( 'click', onPreviewLinkClicked, false );\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Opens a preview window for the target URL.\n\t *\n\t * @param {string} url - url for preview iframe src\n\t */\n\tfunction showPreview( url ) {\n\n\t\tcloseOverlay();\n\n\t\tdom.overlay = document.createElement( 'div' );\n\t\tdom.overlay.classList.add( 'overlay' );\n\t\tdom.overlay.classList.add( 'overlay-preview' );\n\t\tdom.wrapper.appendChild( dom.overlay );\n\n\t\tdom.overlay.innerHTML =\n\t\t\t`<header>\n\t\t\t\t<a class=\"close\" href=\"#\"><span class=\"icon\"></span></a>\n\t\t\t\t<a class=\"external\" href=\"${url}\" target=\"_blank\"><span class=\"icon\"></span></a>\n\t\t\t</header>\n\t\t\t<div class=\"spinner\"></div>\n\t\t\t<div class=\"viewport\">\n\t\t\t\t<iframe src=\"${url}\"></iframe>\n\t\t\t\t<small class=\"viewport-inner\">\n\t\t\t\t\t<span class=\"x-frame-error\">Unable to load iframe. This is likely due to the site's policy (x-frame-options).</span>\n\t\t\t\t</small>\n\t\t\t</div>`;\n\n\t\tdom.overlay.querySelector( 'iframe' ).addEventListener( 'load', event => {\n\t\t\tdom.overlay.classList.add( 'loaded' );\n\t\t}, false );\n\n\t\tdom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {\n\t\t\tcloseOverlay();\n\t\t\tevent.preventDefault();\n\t\t}, false );\n\n\t\tdom.overlay.querySelector( '.external' ).addEventListener( 'click', event => {\n\t\t\tcloseOverlay();\n\t\t}, false );\n\n\t}\n\n\t/**\n\t * Open or close help overlay window.\n\t *\n\t * @param {Boolean} [override] Flag which overrides the\n\t * toggle logic and forcibly sets the desired state. True means\n\t * help is open, false means it's closed.\n\t */\n\tfunction toggleHelp( override ){\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? showHelp() : closeOverlay();\n\t\t}\n\t\telse {\n\t\t\tif( dom.overlay ) {\n\t\t\t\tcloseOverlay();\n\t\t\t}\n\t\t\telse {\n\t\t\t\tshowHelp();\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Opens an overlay window with help material.\n\t */\n\tfunction showHelp() {\n\n\t\tif( config.help ) {\n\n\t\t\tcloseOverlay();\n\n\t\t\tdom.overlay = document.createElement( 'div' );\n\t\t\tdom.overlay.classList.add( 'overlay' );\n\t\t\tdom.overlay.classList.add( 'overlay-help' );\n\t\t\tdom.wrapper.appendChild( dom.overlay );\n\n\t\t\tlet html = '<p class=\"title\">Keyboard Shortcuts</p><br/>';\n\n\t\t\tlet shortcuts = keyboard.getShortcuts(),\n\t\t\t\tbindings = keyboard.getBindings();\n\n\t\t\thtml += '<table><th>KEY</th><th>ACTION</th>';\n\t\t\tfor( let key in shortcuts ) {\n\t\t\t\thtml += `<tr><td>${key}</td><td>${shortcuts[ key ]}</td></tr>`;\n\t\t\t}\n\n\t\t\t// Add custom key bindings that have associated descriptions\n\t\t\tfor( let binding in bindings ) {\n\t\t\t\tif( bindings[binding].key && bindings[binding].description ) {\n\t\t\t\t\thtml += `<tr><td>${bindings[binding].key}</td><td>${bindings[binding].description}</td></tr>`;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\thtml += '</table>';\n\n\t\t\tdom.overlay.innerHTML = `\n\t\t\t\t<header>\n\t\t\t\t\t<a class=\"close\" href=\"#\"><span class=\"icon\"></span></a>\n\t\t\t\t</header>\n\t\t\t\t<div class=\"viewport\">\n\t\t\t\t\t<div class=\"viewport-inner\">${html}</div>\n\t\t\t\t</div>\n\t\t\t`;\n\n\t\t\tdom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {\n\t\t\t\tcloseOverlay();\n\t\t\t\tevent.preventDefault();\n\t\t\t}, false );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Closes any currently open overlay.\n\t */\n\tfunction closeOverlay() {\n\n\t\tif( dom.overlay ) {\n\t\t\tdom.overlay.parentNode.removeChild( dom.overlay );\n\t\t\tdom.overlay = null;\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Applies JavaScript-controlled layout rules to the\n\t * presentation.\n\t */\n\tfunction layout() {\n\n\t\tif( dom.wrapper && !print.isPrintingPDF() ) {\n\n\t\t\tif( !config.disableLayout ) {\n\n\t\t\t\t// On some mobile devices '100vh' is taller than the visible\n\t\t\t\t// viewport which leads to part of the presentation being\n\t\t\t\t// cut off. To work around this we define our own '--vh' custom\n\t\t\t\t// property where 100x adds up to the correct height.\n\t\t\t\t//\n\t\t\t\t// https://css-tricks.com/the-trick-to-viewport-units-on-mobile/\n\t\t\t\tif( Device.isMobile && !config.embedded ) {\n\t\t\t\t\tdocument.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );\n\t\t\t\t}\n\n\t\t\t\tconst size = getComputedSlideSize();\n\n\t\t\t\tconst oldScale = scale;\n\n\t\t\t\t// Layout the contents of the slides\n\t\t\t\tlayoutSlideContents( config.width, config.height );\n\n\t\t\t\tdom.slides.style.width = size.width + 'px';\n\t\t\t\tdom.slides.style.height = size.height + 'px';\n\n\t\t\t\t// Determine scale of content to fit within available space\n\t\t\t\tscale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );\n\n\t\t\t\t// Respect max/min scale settings\n\t\t\t\tscale = Math.max( scale, config.minScale );\n\t\t\t\tscale = Math.min( scale, config.maxScale );\n\n\t\t\t\t// Don't apply any scaling styles if scale is 1\n\t\t\t\tif( scale === 1 ) {\n\t\t\t\t\tdom.slides.style.zoom = '';\n\t\t\t\t\tdom.slides.style.left = '';\n\t\t\t\t\tdom.slides.style.top = '';\n\t\t\t\t\tdom.slides.style.bottom = '';\n\t\t\t\t\tdom.slides.style.right = '';\n\t\t\t\t\ttransformSlides( { layout: '' } );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tdom.slides.style.zoom = '';\n\t\t\t\t\tdom.slides.style.left = '50%';\n\t\t\t\t\tdom.slides.style.top = '50%';\n\t\t\t\t\tdom.slides.style.bottom = 'auto';\n\t\t\t\t\tdom.slides.style.right = 'auto';\n\t\t\t\t\ttransformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );\n\t\t\t\t}\n\n\t\t\t\t// Select all slides, vertical and horizontal\n\t\t\t\tconst slides = Array.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );\n\n\t\t\t\tfor( let i = 0, len = slides.length; i < len; i++ ) {\n\t\t\t\t\tconst slide = slides[ i ];\n\n\t\t\t\t\t// Don't bother updating invisible slides\n\t\t\t\t\tif( slide.style.display === 'none' ) {\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\tif( config.center || slide.classList.contains( 'center' ) ) {\n\t\t\t\t\t\t// Vertical stacks are not centred since their section\n\t\t\t\t\t\t// children will be\n\t\t\t\t\t\tif( slide.classList.contains( 'stack' ) ) {\n\t\t\t\t\t\t\tslide.style.top = 0;\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tslide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tslide.style.top = '';\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tif( oldScale !== scale ) {\n\t\t\t\t\tdispatchEvent({\n\t\t\t\t\t\ttype: 'resize',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\toldScale,\n\t\t\t\t\t\t\tscale,\n\t\t\t\t\t\t\tsize\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdom.viewport.style.setProperty( '--slide-scale', scale );\n\n\t\t\tprogress.update();\n\t\t\tbackgrounds.updateParallax();\n\n\t\t\tif( overview.isActive() ) {\n\t\t\t\toverview.update();\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Applies layout logic to the contents of all slides in\n\t * the presentation.\n\t *\n\t * @param {string|number} width\n\t * @param {string|number} height\n\t */\n\tfunction layoutSlideContents( width, height ) {\n\n\t\t// Handle sizing of elements with the 'r-stretch' class\n\t\tUtil.queryAll( dom.slides, 'section > .stretch, section > .r-stretch' ).forEach( element => {\n\n\t\t\t// Determine how much vertical space we can use\n\t\t\tlet remainingHeight = Util.getRemainingHeight( element, height );\n\n\t\t\t// Consider the aspect ratio of media elements\n\t\t\tif( /(img|video)/gi.test( element.nodeName ) ) {\n\t\t\t\tconst nw = element.naturalWidth || element.videoWidth,\n\t\t\t\t\t  nh = element.naturalHeight || element.videoHeight;\n\n\t\t\t\tconst es = Math.min( width / nw, remainingHeight / nh );\n\n\t\t\t\telement.style.width = ( nw * es ) + 'px';\n\t\t\t\telement.style.height = ( nh * es ) + 'px';\n\n\t\t\t}\n\t\t\telse {\n\t\t\t\telement.style.width = width + 'px';\n\t\t\t\telement.style.height = remainingHeight + 'px';\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Calculates the computed pixel size of our slides. These\n\t * values are based on the width and height configuration\n\t * options.\n\t *\n\t * @param {number} [presentationWidth=dom.wrapper.offsetWidth]\n\t * @param {number} [presentationHeight=dom.wrapper.offsetHeight]\n\t */\n\tfunction getComputedSlideSize( presentationWidth, presentationHeight ) {\n\n\t\tconst size = {\n\t\t\t// Slide size\n\t\t\twidth: config.width,\n\t\t\theight: config.height,\n\n\t\t\t// Presentation size\n\t\t\tpresentationWidth: presentationWidth || dom.wrapper.offsetWidth,\n\t\t\tpresentationHeight: presentationHeight || dom.wrapper.offsetHeight\n\t\t};\n\n\t\t// Reduce available space by margin\n\t\tsize.presentationWidth -= ( size.presentationWidth * config.margin );\n\t\tsize.presentationHeight -= ( size.presentationHeight * config.margin );\n\n\t\t// Slide width may be a percentage of available width\n\t\tif( typeof size.width === 'string' && /%$/.test( size.width ) ) {\n\t\t\tsize.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;\n\t\t}\n\n\t\t// Slide height may be a percentage of available height\n\t\tif( typeof size.height === 'string' && /%$/.test( size.height ) ) {\n\t\t\tsize.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;\n\t\t}\n\n\t\treturn size;\n\n\t}\n\n\t/**\n\t * Stores the vertical index of a stack so that the same\n\t * vertical slide can be selected when navigating to and\n\t * from the stack.\n\t *\n\t * @param {HTMLElement} stack The vertical stack element\n\t * @param {string|number} [v=0] Index to memorize\n\t */\n\tfunction setPreviousVerticalIndex( stack, v ) {\n\n\t\tif( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {\n\t\t\tstack.setAttribute( 'data-previous-indexv', v || 0 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Retrieves the vertical index which was stored using\n\t * #setPreviousVerticalIndex() or 0 if no previous index\n\t * exists.\n\t *\n\t * @param {HTMLElement} stack The vertical stack element\n\t */\n\tfunction getPreviousVerticalIndex( stack ) {\n\n\t\tif( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {\n\t\t\t// Prefer manually defined start-indexv\n\t\t\tconst attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';\n\n\t\t\treturn parseInt( stack.getAttribute( attributeName ) || 0, 10 );\n\t\t}\n\n\t\treturn 0;\n\n\t}\n\n\t/**\n\t * Checks if the current or specified slide is vertical\n\t * (nested within another slide).\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide to check\n\t * orientation of\n\t * @return {Boolean}\n\t */\n\tfunction isVerticalSlide( slide = currentSlide ) {\n\n\t\treturn slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );\n\n\t}\n\n\t/**\n\t * Returns true if we're on the last slide in the current\n\t * vertical stack.\n\t */\n\tfunction isLastVerticalSlide() {\n\n\t\tif( currentSlide && isVerticalSlide( currentSlide ) ) {\n\t\t\t// Does this slide have a next sibling?\n\t\t\tif( currentSlide.nextElementSibling ) return false;\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Returns true if we're currently on the first slide in\n\t * the presentation.\n\t */\n\tfunction isFirstSlide() {\n\n\t\treturn indexh === 0 && indexv === 0;\n\n\t}\n\n\t/**\n\t * Returns true if we're currently on the last slide in\n\t * the presenation. If the last slide is a stack, we only\n\t * consider this the last slide if it's at the end of the\n\t * stack.\n\t */\n\tfunction isLastSlide() {\n\n\t\tif( currentSlide ) {\n\t\t\t// Does this slide have a next sibling?\n\t\t\tif( currentSlide.nextElementSibling ) return false;\n\n\t\t\t// If it's vertical, does its parent have a next sibling?\n\t\t\tif( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Enters the paused mode which fades everything on screen to\n\t * black.\n\t */\n\tfunction pause() {\n\n\t\tif( config.pause ) {\n\t\t\tconst wasPaused = dom.wrapper.classList.contains( 'paused' );\n\n\t\t\tcancelAutoSlide();\n\t\t\tdom.wrapper.classList.add( 'paused' );\n\n\t\t\tif( wasPaused === false ) {\n\t\t\t\tdispatchEvent({ type: 'paused' });\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Exits from the paused mode.\n\t */\n\tfunction resume() {\n\n\t\tconst wasPaused = dom.wrapper.classList.contains( 'paused' );\n\t\tdom.wrapper.classList.remove( 'paused' );\n\n\t\tcueAutoSlide();\n\n\t\tif( wasPaused ) {\n\t\t\tdispatchEvent({ type: 'resumed' });\n\t\t}\n\n\t}\n\n\t/**\n\t * Toggles the paused mode on and off.\n\t */\n\tfunction togglePause( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? pause() : resume();\n\t\t}\n\t\telse {\n\t\t\tisPaused() ? resume() : pause();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if we are currently in the paused mode.\n\t *\n\t * @return {Boolean}\n\t */\n\tfunction isPaused() {\n\n\t\treturn dom.wrapper.classList.contains( 'paused' );\n\n\t}\n\n\t/**\n\t * Toggles the auto slide mode on and off.\n\t *\n\t * @param {Boolean} [override] Flag which sets the desired state.\n\t * True means autoplay starts, false means it stops.\n\t */\n\n\tfunction toggleAutoSlide( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? resumeAutoSlide() : pauseAutoSlide();\n\t\t}\n\n\t\telse {\n\t\t\tautoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if the auto slide mode is currently on.\n\t *\n\t * @return {Boolean}\n\t */\n\tfunction isAutoSliding() {\n\n\t\treturn !!( autoSlide && !autoSlidePaused );\n\n\t}\n\n\t/**\n\t * Steps from the current point in the presentation to the\n\t * slide which matches the specified horizontal and vertical\n\t * indices.\n\t *\n\t * @param {number} [h=indexh] Horizontal index of the target slide\n\t * @param {number} [v=indexv] Vertical index of the target slide\n\t * @param {number} [f] Index of a fragment within the\n\t * target slide to activate\n\t * @param {number} [origin] Origin for use in multimaster environments\n\t */\n\tfunction slide( h, v, f, origin ) {\n\n\t\t// Dispatch an event before hte slide\n\t\tconst slidechange = dispatchEvent({\n\t\t\ttype: 'beforeslidechange',\n\t\t\tdata: {\n\t\t\t\tindexh: h === undefined ? indexh : h,\n\t\t\t\tindexv: v === undefined ? indexv : v,\n\t\t\t\torigin\n\t\t\t}\n\t\t});\n\n\t\t// Abort if this slide change was prevented by an event listener\n\t\tif( slidechange.defaultPrevented ) return;\n\n\t\t// Remember where we were at before\n\t\tpreviousSlide = currentSlide;\n\n\t\t// Query all horizontal slides in the deck\n\t\tconst horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );\n\n\t\t// Abort if there are no slides\n\t\tif( horizontalSlides.length === 0 ) return;\n\n\t\t// If no vertical index is specified and the upcoming slide is a\n\t\t// stack, resume at its previous vertical index\n\t\tif( v === undefined && !overview.isActive() ) {\n\t\t\tv = getPreviousVerticalIndex( horizontalSlides[ h ] );\n\t\t}\n\n\t\t// If we were on a vertical stack, remember what vertical index\n\t\t// it was on so we can resume at the same position when returning\n\t\tif( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {\n\t\t\tsetPreviousVerticalIndex( previousSlide.parentNode, indexv );\n\t\t}\n\n\t\t// Remember the state before this slide\n\t\tconst stateBefore = state.concat();\n\n\t\t// Reset the state array\n\t\tstate.length = 0;\n\n\t\tlet indexhBefore = indexh || 0,\n\t\t\tindexvBefore = indexv || 0;\n\n\t\t// Activate and transition to the new slide\n\t\tindexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );\n\t\tindexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );\n\n\t\t// Dispatch an event if the slide changed\n\t\tlet slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );\n\n\t\t// Ensure that the previous slide is never the same as the current\n\t\tif( !slideChanged ) previousSlide = null;\n\n\t\t// Find the current horizontal slide and any possible vertical slides\n\t\t// within it\n\t\tlet currentHorizontalSlide = horizontalSlides[ indexh ],\n\t\t\tcurrentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );\n\n\t\t// Store references to the previous and current slides\n\t\tcurrentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;\n\n\t\tlet autoAnimateTransition = false;\n\n\t\t// Detect if we're moving between two auto-animated slides\n\t\tif( slideChanged && previousSlide && currentSlide && !overview.isActive() ) {\n\n\t\t\t// If this is an auto-animated transition, we disable the\n\t\t\t// regular slide transition\n\t\t\t//\n\t\t\t// Note 20-03-2020:\n\t\t\t// This needs to happen before we update slide visibility,\n\t\t\t// otherwise transitions will still run in Safari.\n\t\t\tif( previousSlide.hasAttribute( 'data-auto-animate' ) && currentSlide.hasAttribute( 'data-auto-animate' )\n\t\t\t\t\t&& previousSlide.getAttribute( 'data-auto-animate-id' ) === currentSlide.getAttribute( 'data-auto-animate-id' )\n\t\t\t\t\t&& !( ( indexh > indexhBefore || indexv > indexvBefore ) ? currentSlide : previousSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {\n\n\t\t\t\tautoAnimateTransition = true;\n\t\t\t\tdom.slides.classList.add( 'disable-slide-transitions' );\n\t\t\t}\n\n\t\t\ttransition = 'running';\n\n\t\t}\n\n\t\t// Update the visibility of slides now that the indices have changed\n\t\tupdateSlidesVisibility();\n\n\t\tlayout();\n\n\t\t// Update the overview if it's currently active\n\t\tif( overview.isActive() ) {\n\t\t\toverview.update();\n\t\t}\n\n\t\t// Show fragment, if specified\n\t\tif( typeof f !== 'undefined' ) {\n\t\t\tfragments.goto( f );\n\t\t}\n\n\t\t// Solves an edge case where the previous slide maintains the\n\t\t// 'present' class when navigating between adjacent vertical\n\t\t// stacks\n\t\tif( previousSlide && previousSlide !== currentSlide ) {\n\t\t\tpreviousSlide.classList.remove( 'present' );\n\t\t\tpreviousSlide.setAttribute( 'aria-hidden', 'true' );\n\n\t\t\t// Reset all slides upon navigate to home\n\t\t\tif( isFirstSlide() ) {\n\t\t\t\t// Launch async task\n\t\t\t\tsetTimeout( () => {\n\t\t\t\t\tgetVerticalStacks().forEach( slide => {\n\t\t\t\t\t\tsetPreviousVerticalIndex( slide, 0 );\n\t\t\t\t\t} );\n\t\t\t\t}, 0 );\n\t\t\t}\n\t\t}\n\n\t\t// Apply the new state\n\t\tstateLoop: for( let i = 0, len = state.length; i < len; i++ ) {\n\t\t\t// Check if this state existed on the previous slide. If it\n\t\t\t// did, we will avoid adding it repeatedly\n\t\t\tfor( let j = 0; j < stateBefore.length; j++ ) {\n\t\t\t\tif( stateBefore[j] === state[i] ) {\n\t\t\t\t\tstateBefore.splice( j, 1 );\n\t\t\t\t\tcontinue stateLoop;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdom.viewport.classList.add( state[i] );\n\n\t\t\t// Dispatch custom event matching the state's name\n\t\t\tdispatchEvent({ type: state[i] });\n\t\t}\n\n\t\t// Clean up the remains of the previous state\n\t\twhile( stateBefore.length ) {\n\t\t\tdom.viewport.classList.remove( stateBefore.pop() );\n\t\t}\n\n\t\tif( slideChanged ) {\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'slidechanged',\n\t\t\t\tdata: {\n\t\t\t\t\tindexh,\n\t\t\t\t\tindexv,\n\t\t\t\t\tpreviousSlide,\n\t\t\t\t\tcurrentSlide,\n\t\t\t\t\torigin\n\t\t\t\t}\n\t\t\t});\n\t\t}\n\n\t\t// Handle embedded content\n\t\tif( slideChanged || !previousSlide ) {\n\t\t\tslideContent.stopEmbeddedContent( previousSlide );\n\t\t\tslideContent.startEmbeddedContent( currentSlide );\n\t\t}\n\n\t\t// Announce the current slide contents to screen readers\n\t\t// Use animation frame to prevent getComputedStyle in getStatusText\n\t\t// from triggering layout mid-frame\n\t\trequestAnimationFrame( () => {\n\t\t\tannounceStatus( getStatusText( currentSlide ) );\n\t\t});\n\n\t\tprogress.update();\n\t\tcontrols.update();\n\t\tnotes.update();\n\t\tbackgrounds.update();\n\t\tbackgrounds.updateParallax();\n\t\tslideNumber.update();\n\t\tfragments.update();\n\n\t\t// Update the URL hash\n\t\tlocation.writeURL();\n\n\t\tcueAutoSlide();\n\n\t\t// Auto-animation\n\t\tif( autoAnimateTransition ) {\n\n\t\t\tsetTimeout( () => {\n\t\t\t\tdom.slides.classList.remove( 'disable-slide-transitions' );\n\t\t\t}, 0 );\n\n\t\t\tif( config.autoAnimate ) {\n\t\t\t\t// Run the auto-animation between our slides\n\t\t\t\tautoAnimate.run( previousSlide, currentSlide );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Syncs the presentation with the current DOM. Useful\n\t * when new slides or control elements are added or when\n\t * the configuration has changed.\n\t */\n\tfunction sync() {\n\n\t\t// Subscribe to input\n\t\tremoveEventListeners();\n\t\taddEventListeners();\n\n\t\t// Force a layout to make sure the current config is accounted for\n\t\tlayout();\n\n\t\t// Reflect the current autoSlide value\n\t\tautoSlide = config.autoSlide;\n\n\t\t// Start auto-sliding if it's enabled\n\t\tcueAutoSlide();\n\n\t\t// Re-create all slide backgrounds\n\t\tbackgrounds.create();\n\n\t\t// Write the current hash to the URL\n\t\tlocation.writeURL();\n\n\t\tfragments.sortAll();\n\n\t\tcontrols.update();\n\t\tprogress.update();\n\n\t\tupdateSlidesVisibility();\n\n\t\tnotes.update();\n\t\tnotes.updateVisibility();\n\t\tbackgrounds.update( true );\n\t\tslideNumber.update();\n\t\tslideContent.formatEmbeddedContent();\n\n\t\t// Start or stop embedded content depending on global config\n\t\tif( config.autoPlayMedia === false ) {\n\t\t\tslideContent.stopEmbeddedContent( currentSlide, { unloadIframes: false } );\n\t\t}\n\t\telse {\n\t\t\tslideContent.startEmbeddedContent( currentSlide );\n\t\t}\n\n\t\tif( overview.isActive() ) {\n\t\t\toverview.layout();\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates reveal.js to keep in sync with new slide attributes. For\n\t * example, if you add a new `data-background-image` you can call\n\t * this to have reveal.js render the new background image.\n\t *\n\t * Similar to #sync() but more efficient when you only need to\n\t * refresh a specific slide.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tfunction syncSlide( slide = currentSlide ) {\n\n\t\tbackgrounds.sync( slide );\n\t\tfragments.sync( slide );\n\n\t\tslideContent.load( slide );\n\n\t\tbackgrounds.update();\n\t\tnotes.update();\n\n\t}\n\n\t/**\n\t * Resets all vertical slides so that only the first\n\t * is visible.\n\t */\n\tfunction resetVerticalSlides() {\n\n\t\tgetHorizontalSlides().forEach( horizontalSlide => {\n\n\t\t\tUtil.queryAll( horizontalSlide, 'section' ).forEach( ( verticalSlide, y ) => {\n\n\t\t\t\tif( y > 0 ) {\n\t\t\t\t\tverticalSlide.classList.remove( 'present' );\n\t\t\t\t\tverticalSlide.classList.remove( 'past' );\n\t\t\t\t\tverticalSlide.classList.add( 'future' );\n\t\t\t\t\tverticalSlide.setAttribute( 'aria-hidden', 'true' );\n\t\t\t\t}\n\n\t\t\t} );\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Randomly shuffles all slides in the deck.\n\t */\n\tfunction shuffle( slides = getHorizontalSlides() ) {\n\n\t\tslides.forEach( ( slide, i ) => {\n\n\t\t\t// Insert the slide next to a randomly picked sibling slide\n\t\t\t// slide. This may cause the slide to insert before itself,\n\t\t\t// but that's not an issue.\n\t\t\tlet beforeSlide = slides[ Math.floor( Math.random() * slides.length ) ];\n\t\t\tif( beforeSlide.parentNode === slide.parentNode ) {\n\t\t\t\tslide.parentNode.insertBefore( slide, beforeSlide );\n\t\t\t}\n\n\t\t\t// Randomize the order of vertical slides (if there are any)\n\t\t\tlet verticalSlides = slide.querySelectorAll( 'section' );\n\t\t\tif( verticalSlides.length ) {\n\t\t\t\tshuffle( verticalSlides );\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Updates one dimension of slides by showing the slide\n\t * with the specified index.\n\t *\n\t * @param {string} selector A CSS selector that will fetch\n\t * the group of slides we are working with\n\t * @param {number} index The index of the slide that should be\n\t * shown\n\t *\n\t * @return {number} The index of the slide that is now shown,\n\t * might differ from the passed in index if it was out of\n\t * bounds.\n\t */\n\tfunction updateSlides( selector, index ) {\n\n\t\t// Select all slides and convert the NodeList result to\n\t\t// an array\n\t\tlet slides = Util.queryAll( dom.wrapper, selector ),\n\t\t\tslidesLength = slides.length;\n\n\t\tlet printMode = print.isPrintingPDF();\n\t\tlet loopedForwards = false;\n\t\tlet loopedBackwards = false;\n\n\t\tif( slidesLength ) {\n\n\t\t\t// Should the index loop?\n\t\t\tif( config.loop ) {\n\t\t\t\tif( index >= slidesLength ) loopedForwards = true;\n\n\t\t\t\tindex %= slidesLength;\n\n\t\t\t\tif( index < 0 ) {\n\t\t\t\t\tindex = slidesLength + index;\n\t\t\t\t\tloopedBackwards = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Enforce max and minimum index bounds\n\t\t\tindex = Math.max( Math.min( index, slidesLength - 1 ), 0 );\n\n\t\t\tfor( let i = 0; i < slidesLength; i++ ) {\n\t\t\t\tlet element = slides[i];\n\n\t\t\t\tlet reverse = config.rtl && !isVerticalSlide( element );\n\n\t\t\t\t// Avoid .remove() with multiple args for IE11 support\n\t\t\t\telement.classList.remove( 'past' );\n\t\t\t\telement.classList.remove( 'present' );\n\t\t\t\telement.classList.remove( 'future' );\n\n\t\t\t\t// http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute\n\t\t\t\telement.setAttribute( 'hidden', '' );\n\t\t\t\telement.setAttribute( 'aria-hidden', 'true' );\n\n\t\t\t\t// If this element contains vertical slides\n\t\t\t\tif( element.querySelector( 'section' ) ) {\n\t\t\t\t\telement.classList.add( 'stack' );\n\t\t\t\t}\n\n\t\t\t\t// If we're printing static slides, all slides are \"present\"\n\t\t\t\tif( printMode ) {\n\t\t\t\t\telement.classList.add( 'present' );\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif( i < index ) {\n\t\t\t\t\t// Any element previous to index is given the 'past' class\n\t\t\t\t\telement.classList.add( reverse ? 'future' : 'past' );\n\n\t\t\t\t\tif( config.fragments ) {\n\t\t\t\t\t\t// Show all fragments in prior slides\n\t\t\t\t\t\tshowFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( i > index ) {\n\t\t\t\t\t// Any element subsequent to index is given the 'future' class\n\t\t\t\t\telement.classList.add( reverse ? 'past' : 'future' );\n\n\t\t\t\t\tif( config.fragments ) {\n\t\t\t\t\t\t// Hide all fragments in future slides\n\t\t\t\t\t\thideFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Update the visibility of fragments when a presentation loops\n\t\t\t\t// in either direction\n\t\t\t\telse if( i === index && config.fragments ) {\n\t\t\t\t\tif( loopedForwards ) {\n\t\t\t\t\t\thideFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t\telse if( loopedBackwards ) {\n\t\t\t\t\t\tshowFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tlet slide = slides[index];\n\t\t\tlet wasPresent = slide.classList.contains( 'present' );\n\n\t\t\t// Mark the current slide as present\n\t\t\tslide.classList.add( 'present' );\n\t\t\tslide.removeAttribute( 'hidden' );\n\t\t\tslide.removeAttribute( 'aria-hidden' );\n\n\t\t\tif( !wasPresent ) {\n\t\t\t\t// Dispatch an event indicating the slide is now visible\n\t\t\t\tdispatchEvent({\n\t\t\t\t\ttarget: slide,\n\t\t\t\t\ttype: 'visible',\n\t\t\t\t\tbubbles: false\n\t\t\t\t});\n\t\t\t}\n\n\t\t\t// If this slide has a state associated with it, add it\n\t\t\t// onto the current state of the deck\n\t\t\tlet slideState = slide.getAttribute( 'data-state' );\n\t\t\tif( slideState ) {\n\t\t\t\tstate = state.concat( slideState.split( ' ' ) );\n\t\t\t}\n\n\t\t}\n\t\telse {\n\t\t\t// Since there are no slides we can't be anywhere beyond the\n\t\t\t// zeroth index\n\t\t\tindex = 0;\n\t\t}\n\n\t\treturn index;\n\n\t}\n\n\t/**\n\t * Shows all fragment elements within the given contaienr.\n\t */\n\tfunction showFragmentsIn( container ) {\n\n\t\tUtil.queryAll( container, '.fragment' ).forEach( fragment => {\n\t\t\tfragment.classList.add( 'visible' );\n\t\t\tfragment.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Hides all fragment elements within the given contaienr.\n\t */\n\tfunction hideFragmentsIn( container ) {\n\n\t\tUtil.queryAll( container, '.fragment.visible' ).forEach( fragment => {\n\t\t\tfragment.classList.remove( 'visible', 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Optimization method; hide all slides that are far away\n\t * from the present slide.\n\t */\n\tfunction updateSlidesVisibility() {\n\n\t\t// Select all slides and convert the NodeList result to\n\t\t// an array\n\t\tlet horizontalSlides = getHorizontalSlides(),\n\t\t\thorizontalSlidesLength = horizontalSlides.length,\n\t\t\tdistanceX,\n\t\t\tdistanceY;\n\n\t\tif( horizontalSlidesLength && typeof indexh !== 'undefined' ) {\n\n\t\t\t// The number of steps away from the present slide that will\n\t\t\t// be visible\n\t\t\tlet viewDistance = overview.isActive() ? 10 : config.viewDistance;\n\n\t\t\t// Shorten the view distance on devices that typically have\n\t\t\t// less resources\n\t\t\tif( Device.isMobile ) {\n\t\t\t\tviewDistance = overview.isActive() ? 6 : config.mobileViewDistance;\n\t\t\t}\n\n\t\t\t// All slides need to be visible when exporting to PDF\n\t\t\tif( print.isPrintingPDF() ) {\n\t\t\t\tviewDistance = Number.MAX_VALUE;\n\t\t\t}\n\n\t\t\tfor( let x = 0; x < horizontalSlidesLength; x++ ) {\n\t\t\t\tlet horizontalSlide = horizontalSlides[x];\n\n\t\t\t\tlet verticalSlides = Util.queryAll( horizontalSlide, 'section' ),\n\t\t\t\t\tverticalSlidesLength = verticalSlides.length;\n\n\t\t\t\t// Determine how far away this slide is from the present\n\t\t\t\tdistanceX = Math.abs( ( indexh || 0 ) - x ) || 0;\n\n\t\t\t\t// If the presentation is looped, distance should measure\n\t\t\t\t// 1 between the first and last slides\n\t\t\t\tif( config.loop ) {\n\t\t\t\t\tdistanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;\n\t\t\t\t}\n\n\t\t\t\t// Show the horizontal slide if it's within the view distance\n\t\t\t\tif( distanceX < viewDistance ) {\n\t\t\t\t\tslideContent.load( horizontalSlide );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tslideContent.unload( horizontalSlide );\n\t\t\t\t}\n\n\t\t\t\tif( verticalSlidesLength ) {\n\n\t\t\t\t\tlet oy = getPreviousVerticalIndex( horizontalSlide );\n\n\t\t\t\t\tfor( let y = 0; y < verticalSlidesLength; y++ ) {\n\t\t\t\t\t\tlet verticalSlide = verticalSlides[y];\n\n\t\t\t\t\t\tdistanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );\n\n\t\t\t\t\t\tif( distanceX + distanceY < viewDistance ) {\n\t\t\t\t\t\t\tslideContent.load( verticalSlide );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tslideContent.unload( verticalSlide );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Flag if there are ANY vertical slides, anywhere in the deck\n\t\t\tif( hasVerticalSlides() ) {\n\t\t\t\tdom.wrapper.classList.add( 'has-vertical-slides' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tdom.wrapper.classList.remove( 'has-vertical-slides' );\n\t\t\t}\n\n\t\t\t// Flag if there are ANY horizontal slides, anywhere in the deck\n\t\t\tif( hasHorizontalSlides() ) {\n\t\t\t\tdom.wrapper.classList.add( 'has-horizontal-slides' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tdom.wrapper.classList.remove( 'has-horizontal-slides' );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Determine what available routes there are for navigation.\n\t *\n\t * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}\n\t */\n\tfunction availableRoutes({ includeFragments = false } = {}) {\n\n\t\tlet horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),\n\t\t\tverticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );\n\n\t\tlet routes = {\n\t\t\tleft: indexh > 0,\n\t\t\tright: indexh < horizontalSlides.length - 1,\n\t\t\tup: indexv > 0,\n\t\t\tdown: indexv < verticalSlides.length - 1\n\t\t};\n\n\t\t// Looped presentations can always be navigated as long as\n\t\t// there are slides available\n\t\tif( config.loop ) {\n\t\t\tif( horizontalSlides.length > 1 ) {\n\t\t\t\troutes.left = true;\n\t\t\t\troutes.right = true;\n\t\t\t}\n\n\t\t\tif( verticalSlides.length > 1 ) {\n\t\t\t\troutes.up = true;\n\t\t\t\troutes.down = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( horizontalSlides.length > 1 && config.navigationMode === 'linear' ) {\n\t\t\troutes.right = routes.right || routes.down;\n\t\t\troutes.left = routes.left || routes.up;\n\t\t}\n\n\t\t// If includeFragments is set, a route will be considered\n\t\t// availalbe if either a slid OR fragment is available in\n\t\t// the given direction\n\t\tif( includeFragments === true ) {\n\t\t\tlet fragmentRoutes = fragments.availableRoutes();\n\t\t\troutes.left = routes.left || fragmentRoutes.prev;\n\t\t\troutes.up = routes.up || fragmentRoutes.prev;\n\t\t\troutes.down = routes.down || fragmentRoutes.next;\n\t\t\troutes.right = routes.right || fragmentRoutes.next;\n\t\t}\n\n\t\t// Reverse horizontal controls for rtl\n\t\tif( config.rtl ) {\n\t\t\tlet left = routes.left;\n\t\t\troutes.left = routes.right;\n\t\t\troutes.right = left;\n\t\t}\n\n\t\treturn routes;\n\n\t}\n\n\t/**\n\t * Returns the number of past slides. This can be used as a global\n\t * flattened index for slides.\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide we're counting before\n\t *\n\t * @return {number} Past slide count\n\t */\n\tfunction getSlidePastCount( slide = currentSlide ) {\n\n\t\tlet horizontalSlides = getHorizontalSlides();\n\n\t\t// The number of past slides\n\t\tlet pastCount = 0;\n\n\t\t// Step through all slides and count the past ones\n\t\tmainLoop: for( let i = 0; i < horizontalSlides.length; i++ ) {\n\n\t\t\tlet horizontalSlide = horizontalSlides[i];\n\t\t\tlet verticalSlides = horizontalSlide.querySelectorAll( 'section' );\n\n\t\t\tfor( let j = 0; j < verticalSlides.length; j++ ) {\n\n\t\t\t\t// Stop as soon as we arrive at the present\n\t\t\t\tif( verticalSlides[j] === slide ) {\n\t\t\t\t\tbreak mainLoop;\n\t\t\t\t}\n\n\t\t\t\t// Don't count slides with the \"uncounted\" class\n\t\t\t\tif( verticalSlides[j].dataset.visibility !== 'uncounted' ) {\n\t\t\t\t\tpastCount++;\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\t// Stop as soon as we arrive at the present\n\t\t\tif( horizontalSlide === slide ) {\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\t// Don't count the wrapping section for vertical slides and\n\t\t\t// slides marked as uncounted\n\t\t\tif( horizontalSlide.classList.contains( 'stack' ) === false && horizontalSlide.dataset.visibility !== 'uncounted' ) {\n\t\t\t\tpastCount++;\n\t\t\t}\n\n\t\t}\n\n\t\treturn pastCount;\n\n\t}\n\n\t/**\n\t * Returns a value ranging from 0-1 that represents\n\t * how far into the presentation we have navigated.\n\t *\n\t * @return {number}\n\t */\n\tfunction getProgress() {\n\n\t\t// The number of past and total slides\n\t\tlet totalCount = getTotalSlides();\n\t\tlet pastCount = getSlidePastCount();\n\n\t\tif( currentSlide ) {\n\n\t\t\tlet allFragments = currentSlide.querySelectorAll( '.fragment' );\n\n\t\t\t// If there are fragments in the current slide those should be\n\t\t\t// accounted for in the progress.\n\t\t\tif( allFragments.length > 0 ) {\n\t\t\t\tlet visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );\n\n\t\t\t\t// This value represents how big a portion of the slide progress\n\t\t\t\t// that is made up by its fragments (0-1)\n\t\t\t\tlet fragmentWeight = 0.9;\n\n\t\t\t\t// Add fragment progress to the past slide count\n\t\t\t\tpastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;\n\t\t\t}\n\n\t\t}\n\n\t\treturn Math.min( pastCount / ( totalCount - 1 ), 1 );\n\n\t}\n\n\t/**\n\t * Retrieves the h/v location and fragment of the current,\n\t * or specified, slide.\n\t *\n\t * @param {HTMLElement} [slide] If specified, the returned\n\t * index will be for this slide rather than the currently\n\t * active one\n\t *\n\t * @return {{h: number, v: number, f: number}}\n\t */\n\tfunction getIndices( slide ) {\n\n\t\t// By default, return the current indices\n\t\tlet h = indexh,\n\t\t\tv = indexv,\n\t\t\tf;\n\n\t\t// If a slide is specified, return the indices of that slide\n\t\tif( slide ) {\n\t\t\tlet isVertical = isVerticalSlide( slide );\n\t\t\tlet slideh = isVertical ? slide.parentNode : slide;\n\n\t\t\t// Select all horizontal slides\n\t\t\tlet horizontalSlides = getHorizontalSlides();\n\n\t\t\t// Now that we know which the horizontal slide is, get its index\n\t\t\th = Math.max( horizontalSlides.indexOf( slideh ), 0 );\n\n\t\t\t// Assume we're not vertical\n\t\t\tv = undefined;\n\n\t\t\t// If this is a vertical slide, grab the vertical index\n\t\t\tif( isVertical ) {\n\t\t\t\tv = Math.max( Util.queryAll( slide.parentNode, 'section' ).indexOf( slide ), 0 );\n\t\t\t}\n\t\t}\n\n\t\tif( !slide && currentSlide ) {\n\t\t\tlet hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;\n\t\t\tif( hasFragments ) {\n\t\t\t\tlet currentFragment = currentSlide.querySelector( '.current-fragment' );\n\t\t\t\tif( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\t\tf = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tf = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn { h, v, f };\n\n\t}\n\n\t/**\n\t * Retrieves all slides in this presentation.\n\t */\n\tfunction getSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, SLIDES_SELECTOR + ':not(.stack):not([data-visibility=\"uncounted\"])' );\n\n\t}\n\n\t/**\n\t * Returns a list of all horizontal slides in the deck. Each\n\t * vertical stack is included as one horizontal slide in the\n\t * resulting array.\n\t */\n\tfunction getHorizontalSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR );\n\n\t}\n\n\t/**\n\t * Returns all vertical slides that exist within this deck.\n\t */\n\tfunction getVerticalSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, '.slides>section>section' );\n\n\t}\n\n\t/**\n\t * Returns all vertical stacks (each stack can contain multiple slides).\n\t */\n\tfunction getVerticalStacks() {\n\n\t\treturn Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.stack');\n\n\t}\n\n\t/**\n\t * Returns true if there are at least two horizontal slides.\n\t */\n\tfunction hasHorizontalSlides() {\n\n\t\treturn getHorizontalSlides().length > 1;\n\t}\n\n\t/**\n\t * Returns true if there are at least two vertical slides.\n\t */\n\tfunction hasVerticalSlides() {\n\n\t\treturn getVerticalSlides().length > 1;\n\n\t}\n\n\t/**\n\t * Returns an array of objects where each object represents the\n\t * attributes on its respective slide.\n\t */\n\tfunction getSlidesAttributes() {\n\n\t\treturn getSlides().map( slide => {\n\n\t\t\tlet attributes = {};\n\t\t\tfor( let i = 0; i < slide.attributes.length; i++ ) {\n\t\t\t\tlet attribute = slide.attributes[ i ];\n\t\t\t\tattributes[ attribute.name ] = attribute.value;\n\t\t\t}\n\t\t\treturn attributes;\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Retrieves the total number of slides in this presentation.\n\t *\n\t * @return {number}\n\t */\n\tfunction getTotalSlides() {\n\n\t\treturn getSlides().length;\n\n\t}\n\n\t/**\n\t * Returns the slide element matching the specified index.\n\t *\n\t * @return {HTMLElement}\n\t */\n\tfunction getSlide( x, y ) {\n\n\t\tlet horizontalSlide = getHorizontalSlides()[ x ];\n\t\tlet verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );\n\n\t\tif( verticalSlides && verticalSlides.length && typeof y === 'number' ) {\n\t\t\treturn verticalSlides ? verticalSlides[ y ] : undefined;\n\t\t}\n\n\t\treturn horizontalSlide;\n\n\t}\n\n\t/**\n\t * Returns the background element for the given slide.\n\t * All slides, even the ones with no background properties\n\t * defined, have a background element so as long as the\n\t * index is valid an element will be returned.\n\t *\n\t * @param {mixed} x Horizontal background index OR a slide\n\t * HTML element\n\t * @param {number} y Vertical background index\n\t * @return {(HTMLElement[]|*)}\n\t */\n\tfunction getSlideBackground( x, y ) {\n\n\t\tlet slide = typeof x === 'number' ? getSlide( x, y ) : x;\n\t\tif( slide ) {\n\t\t\treturn slide.slideBackgroundElement;\n\t\t}\n\n\t\treturn undefined;\n\n\t}\n\n\t/**\n\t * Retrieves the current state of the presentation as\n\t * an object. This state can then be restored at any\n\t * time.\n\t *\n\t * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}\n\t */\n\tfunction getState() {\n\n\t\tlet indices = getIndices();\n\n\t\treturn {\n\t\t\tindexh: indices.h,\n\t\t\tindexv: indices.v,\n\t\t\tindexf: indices.f,\n\t\t\tpaused: isPaused(),\n\t\t\toverview: overview.isActive()\n\t\t};\n\n\t}\n\n\t/**\n\t * Restores the presentation to the given state.\n\t *\n\t * @param {object} state As generated by getState()\n\t * @see {@link getState} generates the parameter `state`\n\t */\n\tfunction setState( state ) {\n\n\t\tif( typeof state === 'object' ) {\n\t\t\tslide( Util.deserialize( state.indexh ), Util.deserialize( state.indexv ), Util.deserialize( state.indexf ) );\n\n\t\t\tlet pausedFlag = Util.deserialize( state.paused ),\n\t\t\t\toverviewFlag = Util.deserialize( state.overview );\n\n\t\t\tif( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {\n\t\t\t\ttogglePause( pausedFlag );\n\t\t\t}\n\n\t\t\tif( typeof overviewFlag === 'boolean' && overviewFlag !== overview.isActive() ) {\n\t\t\t\toverview.toggle( overviewFlag );\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Cues a new automated slide if enabled in the config.\n\t */\n\tfunction cueAutoSlide() {\n\n\t\tcancelAutoSlide();\n\n\t\tif( currentSlide && config.autoSlide !== false ) {\n\n\t\t\tlet fragment = currentSlide.querySelector( '.current-fragment' );\n\n\t\t\t// When the slide first appears there is no \"current\" fragment so\n\t\t\t// we look for a data-autoslide timing on the first fragment\n\t\t\tif( !fragment ) fragment = currentSlide.querySelector( '.fragment' );\n\n\t\t\tlet fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;\n\t\t\tlet parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;\n\t\t\tlet slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );\n\n\t\t\t// Pick value in the following priority order:\n\t\t\t// 1. Current fragment's data-autoslide\n\t\t\t// 2. Current slide's data-autoslide\n\t\t\t// 3. Parent slide's data-autoslide\n\t\t\t// 4. Global autoSlide setting\n\t\t\tif( fragmentAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( fragmentAutoSlide, 10 );\n\t\t\t}\n\t\t\telse if( slideAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( slideAutoSlide, 10 );\n\t\t\t}\n\t\t\telse if( parentAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( parentAutoSlide, 10 );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tautoSlide = config.autoSlide;\n\n\t\t\t\t// If there are media elements with data-autoplay,\n\t\t\t\t// automatically set the autoSlide duration to the\n\t\t\t\t// length of that media. Not applicable if the slide\n\t\t\t\t// is divided up into fragments.\n\t\t\t\t// playbackRate is accounted for in the duration.\n\t\t\t\tif( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {\n\t\t\t\t\tUtil.queryAll( currentSlide, 'video, audio' ).forEach( el => {\n\t\t\t\t\t\tif( el.hasAttribute( 'data-autoplay' ) ) {\n\t\t\t\t\t\t\tif( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {\n\t\t\t\t\t\t\t\tautoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Cue the next auto-slide if:\n\t\t\t// - There is an autoSlide value\n\t\t\t// - Auto-sliding isn't paused by the user\n\t\t\t// - The presentation isn't paused\n\t\t\t// - The overview isn't active\n\t\t\t// - The presentation isn't over\n\t\t\tif( autoSlide && !autoSlidePaused && !isPaused() && !overview.isActive() && ( !isLastSlide() || fragments.availableRoutes().next || config.loop === true ) ) {\n\t\t\t\tautoSlideTimeout = setTimeout( () => {\n\t\t\t\t\tif( typeof config.autoSlideMethod === 'function' ) {\n\t\t\t\t\t\tconfig.autoSlideMethod()\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tnavigateNext();\n\t\t\t\t\t}\n\t\t\t\t\tcueAutoSlide();\n\t\t\t\t}, autoSlide );\n\t\t\t\tautoSlideStartTime = Date.now();\n\t\t\t}\n\n\t\t\tif( autoSlidePlayer ) {\n\t\t\t\tautoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Cancels any ongoing request to auto-slide.\n\t */\n\tfunction cancelAutoSlide() {\n\n\t\tclearTimeout( autoSlideTimeout );\n\t\tautoSlideTimeout = -1;\n\n\t}\n\n\tfunction pauseAutoSlide() {\n\n\t\tif( autoSlide && !autoSlidePaused ) {\n\t\t\tautoSlidePaused = true;\n\t\t\tdispatchEvent({ type: 'autoslidepaused' });\n\t\t\tclearTimeout( autoSlideTimeout );\n\n\t\t\tif( autoSlidePlayer ) {\n\t\t\t\tautoSlidePlayer.setPlaying( false );\n\t\t\t}\n\t\t}\n\n\t}\n\n\tfunction resumeAutoSlide() {\n\n\t\tif( autoSlide && autoSlidePaused ) {\n\t\t\tautoSlidePaused = false;\n\t\t\tdispatchEvent({ type: 'autoslideresumed' });\n\t\t\tcueAutoSlide();\n\t\t}\n\n\t}\n\n\tfunction navigateLeft({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\n\t\t// Reverse for RTL\n\t\tif( config.rtl ) {\n\t\t\tif( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().left ) {\n\t\t\t\tslide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t\t}\n\t\t}\n\t\t// Normal navigation\n\t\telse if( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().left ) {\n\t\t\tslide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t}\n\n\t}\n\n\tfunction navigateRight({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\n\t\t// Reverse for RTL\n\t\tif( config.rtl ) {\n\t\t\tif( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().right ) {\n\t\t\t\tslide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t\t}\n\t\t}\n\t\t// Normal navigation\n\t\telse if( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().right ) {\n\t\t\tslide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t}\n\n\t}\n\n\tfunction navigateUp({skipFragments=false}={}) {\n\n\t\t// Prioritize hiding fragments\n\t\tif( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().up ) {\n\t\t\tslide( indexh, indexv - 1 );\n\t\t}\n\n\t}\n\n\tfunction navigateDown({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedVertically = true;\n\n\t\t// Prioritize revealing fragments\n\t\tif( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().down ) {\n\t\t\tslide( indexh, indexv + 1 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Navigates backwards, prioritized in the following order:\n\t * 1) Previous fragment\n\t * 2) Previous vertical slide\n\t * 3) Previous horizontal slide\n\t */\n\tfunction navigatePrev({skipFragments=false}={}) {\n\n\t\t// Prioritize revealing fragments\n\t\tif( skipFragments || fragments.prev() === false ) {\n\t\t\tif( availableRoutes().up ) {\n\t\t\t\tnavigateUp({skipFragments});\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// Fetch the previous horizontal slide, if there is one\n\t\t\t\tlet previousSlide;\n\n\t\t\t\tif( config.rtl ) {\n\t\t\t\t\tpreviousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.future' ).pop();\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tpreviousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.past' ).pop();\n\t\t\t\t}\n\n\t\t\t\t// When going backwards and arriving on a stack we start\n\t\t\t\t// at the bottom of the stack\n\t\t\t\tif( previousSlide && previousSlide.classList.contains( 'stack' ) ) {\n\t\t\t\t\tlet v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;\n\t\t\t\t\tlet h = indexh - 1;\n\t\t\t\t\tslide( h, v );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tnavigateLeft({skipFragments});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * The reverse of #navigatePrev().\n\t */\n\tfunction navigateNext({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\t\tnavigationHistory.hasNavigatedVertically = true;\n\n\t\t// Prioritize revealing fragments\n\t\tif( skipFragments || fragments.next() === false ) {\n\n\t\t\tlet routes = availableRoutes();\n\n\t\t\t// When looping is enabled `routes.down` is always available\n\t\t\t// so we need a separate check for when we've reached the\n\t\t\t// end of a stack and should move horizontally\n\t\t\tif( routes.down && routes.right && config.loop && isLastVerticalSlide() ) {\n\t\t\t\troutes.down = false;\n\t\t\t}\n\n\t\t\tif( routes.down ) {\n\t\t\t\tnavigateDown({skipFragments});\n\t\t\t}\n\t\t\telse if( config.rtl ) {\n\t\t\t\tnavigateLeft({skipFragments});\n\t\t\t}\n\t\t\telse {\n\t\t\t\tnavigateRight({skipFragments});\n\t\t\t}\n\t\t}\n\n\t}\n\n\n\t// --------------------------------------------------------------------//\n\t// ----------------------------- EVENTS -------------------------------//\n\t// --------------------------------------------------------------------//\n\n\t/**\n\t * Called by all event handlers that are based on user\n\t * input.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onUserInput( event ) {\n\n\t\tif( config.autoSlideStoppable ) {\n\t\t\tpauseAutoSlide();\n\t\t}\n\n\t}\n\n\t/**\n\t* Listener for post message events posted to this window.\n\t*/\n\tfunction onPostMessage( event ) {\n\n\t\tlet data = event.data;\n\n\t\t// Make sure we're dealing with JSON\n\t\tif( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {\n\t\t\tdata = JSON.parse( data );\n\n\t\t\t// Check if the requested method can be found\n\t\t\tif( data.method && typeof Reveal[data.method] === 'function' ) {\n\n\t\t\t\tif( POST_MESSAGE_METHOD_BLACKLIST.test( data.method ) === false ) {\n\n\t\t\t\t\tconst result = Reveal[data.method].apply( Reveal, data.args );\n\n\t\t\t\t\t// Dispatch a postMessage event with the returned value from\n\t\t\t\t\t// our method invocation for getter functions\n\t\t\t\t\tdispatchPostMessage( 'callback', { method: data.method, result: result } );\n\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tconsole.warn( 'reveal.js: \"'+ data.method +'\" is is blacklisted from the postMessage API' );\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Event listener for transition end on the current slide.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onTransitionEnd( event ) {\n\n\t\tif( transition === 'running' && /section/gi.test( event.target.nodeName ) ) {\n\t\t\ttransition = 'idle';\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'slidetransitionend',\n\t\t\t\tdata: { indexh, indexv, previousSlide, currentSlide }\n\t\t\t});\n\t\t}\n\n\t}\n\n\t/**\n\t * A global listener for all click events inside of the\n\t * .slides container.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onSlidesClicked( event ) {\n\n\t\tconst anchor = Util.closest( event.target, 'a[href^=\"#\"]' );\n\n\t\t// If a hash link is clicked, we find the target slide\n\t\t// and navigate to it. We previously relied on 'hashchange'\n\t\t// for links like these but that prevented media with\n\t\t// audio tracks from playing in mobile browsers since it\n\t\t// wasn't considered a direct interaction with the document.\n\t\tif( anchor ) {\n\t\t\tconst hash = anchor.getAttribute( 'href' );\n\t\t\tconst indices = location.getIndicesFromHash( hash );\n\n\t\t\tif( indices ) {\n\t\t\t\tReveal.slide( indices.h, indices.v, indices.f );\n\t\t\t\tevent.preventDefault();\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the window level 'resize' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onWindowResize( event ) {\n\n\t\tlayout();\n\n\t}\n\n\t/**\n\t * Handle for the window level 'visibilitychange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onPageVisibilityChange( event ) {\n\n\t\t// If, after clicking a link or similar and we're coming back,\n\t\t// focus the document.body to ensure we can use keyboard shortcuts\n\t\tif( document.hidden === false && document.activeElement !== document.body ) {\n\t\t\t// Not all elements support .blur() - SVGs among them.\n\t\t\tif( typeof document.activeElement.blur === 'function' ) {\n\t\t\t\tdocument.activeElement.blur();\n\t\t\t}\n\t\t\tdocument.body.focus();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the document level 'fullscreenchange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onFullscreenChange( event ) {\n\n\t\tlet element = document.fullscreenElement || document.webkitFullscreenElement;\n\t\tif( element === dom.wrapper ) {\n\t\t\tevent.stopImmediatePropagation();\n\n\t\t\t// Timeout to avoid layout shift in Safari\n\t\t\tsetTimeout( () => {\n\t\t\t\tReveal.layout();\n\t\t\t\tReveal.focus.focus(); // focus.focus :'(\n\t\t\t}, 1 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Handles clicks on links that are set to preview in the\n\t * iframe overlay.\n\t *\n\t * @param {object} event\n\t */\n\tfunction onPreviewLinkClicked( event ) {\n\n\t\tif( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {\n\t\t\tlet url = event.currentTarget.getAttribute( 'href' );\n\t\t\tif( url ) {\n\t\t\t\tshowPreview( url );\n\t\t\t\tevent.preventDefault();\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Handles click on the auto-sliding controls element.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onAutoSlidePlayerClick( event ) {\n\n\t\t// Replay\n\t\tif( isLastSlide() && config.loop === false ) {\n\t\t\tslide( 0, 0 );\n\t\t\tresumeAutoSlide();\n\t\t}\n\t\t// Resume\n\t\telse if( autoSlidePaused ) {\n\t\t\tresumeAutoSlide();\n\t\t}\n\t\t// Pause\n\t\telse {\n\t\t\tpauseAutoSlide();\n\t\t}\n\n\t}\n\n\n\t// --------------------------------------------------------------------//\n\t// ------------------------------- API --------------------------------//\n\t// --------------------------------------------------------------------//\n\n\t// The public reveal.js API\n\tconst API = {\n\t\tVERSION,\n\n\t\tinitialize,\n\t\tconfigure,\n\t\tdestroy,\n\n\t\tsync,\n\t\tsyncSlide,\n\t\tsyncFragments: fragments.sync.bind( fragments ),\n\n\t\t// Navigation methods\n\t\tslide,\n\t\tleft: navigateLeft,\n\t\tright: navigateRight,\n\t\tup: navigateUp,\n\t\tdown: navigateDown,\n\t\tprev: navigatePrev,\n\t\tnext: navigateNext,\n\n\t\t// Navigation aliases\n\t\tnavigateLeft, navigateRight, navigateUp, navigateDown, navigatePrev, navigateNext,\n\n\t\t// Fragment methods\n\t\tnavigateFragment: fragments.goto.bind( fragments ),\n\t\tprevFragment: fragments.prev.bind( fragments ),\n\t\tnextFragment: fragments.next.bind( fragments ),\n\n\t\t// Event binding\n\t\ton,\n\t\toff,\n\n\t\t// Legacy event binding methods left in for backwards compatibility\n\t\taddEventListener: on,\n\t\tremoveEventListener: off,\n\n\t\t// Forces an update in slide layout\n\t\tlayout,\n\n\t\t// Randomizes the order of slides\n\t\tshuffle,\n\n\t\t// Returns an object with the available routes as booleans (left/right/top/bottom)\n\t\tavailableRoutes,\n\n\t\t// Returns an object with the available fragments as booleans (prev/next)\n\t\tavailableFragments: fragments.availableRoutes.bind( fragments ),\n\n\t\t// Toggles a help overlay with keyboard shortcuts\n\t\ttoggleHelp,\n\n\t\t// Toggles the overview mode on/off\n\t\ttoggleOverview: overview.toggle.bind( overview ),\n\n\t\t// Toggles the \"black screen\" mode on/off\n\t\ttogglePause,\n\n\t\t// Toggles the auto slide mode on/off\n\t\ttoggleAutoSlide,\n\n\t\t// Slide navigation checks\n\t\tisFirstSlide,\n\t\tisLastSlide,\n\t\tisLastVerticalSlide,\n\t\tisVerticalSlide,\n\n\t\t// State checks\n\t\tisPaused,\n\t\tisAutoSliding,\n\t\tisSpeakerNotes: notes.isSpeakerNotesWindow.bind( notes ),\n\t\tisOverview: overview.isActive.bind( overview ),\n\t\tisFocused: focus.isFocused.bind( focus ),\n\t\tisPrintingPDF: print.isPrintingPDF.bind( print ),\n\n\t\t// Checks if reveal.js has been loaded and is ready for use\n\t\tisReady: () => ready,\n\n\t\t// Slide preloading\n\t\tloadSlide: slideContent.load.bind( slideContent ),\n\t\tunloadSlide: slideContent.unload.bind( slideContent ),\n\n\t\t// Preview management\n\t\tshowPreview,\n\t\thidePreview: closeOverlay,\n\n\t\t// Adds or removes all internal event listeners\n\t\taddEventListeners,\n\t\tremoveEventListeners,\n\t\tdispatchEvent,\n\n\t\t// Facility for persisting and restoring the presentation state\n\t\tgetState,\n\t\tsetState,\n\n\t\t// Presentation progress on range of 0-1\n\t\tgetProgress,\n\n\t\t// Returns the indices of the current, or specified, slide\n\t\tgetIndices,\n\n\t\t// Returns an Array of key:value maps of the attributes of each\n\t\t// slide in the deck\n\t\tgetSlidesAttributes,\n\n\t\t// Returns the number of slides that we have passed\n\t\tgetSlidePastCount,\n\n\t\t// Returns the total number of slides\n\t\tgetTotalSlides,\n\n\t\t// Returns the slide element at the specified index\n\t\tgetSlide,\n\n\t\t// Returns the previous slide element, may 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() => backgrounds.element,\n\n\t\t// API for registering and retrieving plugins\n\t\tregisterPlugin: plugins.registerPlugin.bind( plugins ),\n\t\thasPlugin: plugins.hasPlugin.bind( plugins ),\n\t\tgetPlugin: plugins.getPlugin.bind( plugins ),\n\t\tgetPlugins: plugins.getRegisteredPlugins.bind( plugins )\n\n\t};\n\n\t// Our internal API which controllers have access to\n\tUtil.extend( Reveal, {\n\t\t...API,\n\n\t\t// Methods for announcing content to screen readers\n\t\tannounceStatus,\n\t\tgetStatusText,\n\n\t\t// Controllers\n\t\tprint,\n\t\tfocus,\n\t\tprogress,\n\t\tcontrols,\n\t\tlocation,\n\t\toverview,\n\t\tfragments,\n\t\tslideContent,\n\t\tslideNumber,\n\n\t\tonUserInput,\n\t\tcloseOverlay,\n\t\tupdateSlidesVisibility,\n\t\tlayoutSlideContents,\n\t\ttransformSlides,\n\t\tcueAutoSlide,\n\t\tcancelAutoSlide\n\t} );\n\n\treturn API;\n\n};\n","import Deck, { VERSION } from './reveal.js'\n\n/**\n * Expose the Reveal class to the window. 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\ No newline at end of file
diff --git a/dist/reveal.js b/dist/reveal.js
index 053dbbbab21..4dd6851d046 100644
--- a/dist/reveal.js
+++ b/dist/reveal.js
@@ -5,5 +5,5 @@
 *
 * Copyright (C) 2011-2022 Hakim El Hattab, https://hakim.se
 */
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left",s.styles.transform="none"}}for(var f in s.styles){var v=s.styles[f],p=o.styles[f];v===p?delete s.styles[f]:(!0===v.explicitValue&&(s.styles[f]=v.value),!0===p.explicitValue&&(o.styles[f]=p.value))}var g="",m=Object.keys(s.styles);m.length>0&&(o.styles.transition="none",s.styles.transition="all ".concat(a.duration,"s ").concat(a.easing," ").concat(a.delay,"s"),s.styles["transition-property"]=m.join(", "),s.styles["will-change"]=m.join(", "),g='[data-auto-animate-target="'+r+'"] {'+Object.keys(o.styles).map((function(e){return e+": "+o.styles[e]+" !important;"})).join("")+'}[data-auto-animate="running"] [data-auto-animate-target="'+r+'"] {'+Object.keys(s.styles).map((function(e){return e+": "+s.styles[e]+" !important;"})).join("")+"}");return g}},{key:"getAutoAnimateOptions",value:function(e,t){var n={easing:this.Reveal.getConfig().autoAnimateEasing,duration:this.Reveal.getConfig().autoAnimateDuration,delay:0};if(n=mh(n,t),e.parentNode){var i=kh(e.parentNode,"[data-auto-animate-target]");i&&(n=this.getAutoAnimateOptions(i,n))}return e.dataset.autoAnimateEasing&&(n.easing=e.dataset.autoAnimateEasing),e.dataset.autoAnimateDuration&&(n.duration=parseFloat(e.dataset.autoAnimateDuration)),e.dataset.autoAnimateDelay&&(n.delay=parseFloat(e.dataset.autoAnimateDelay)),n}},{key:"getAutoAnimatableProperties",value:function(e,t,n){var i=this.Reveal.getConfig(),r={styles:[]};if(!1!==n.translate||!1!==n.scale){var a;if("function"==typeof n.measure)a=n.measure(t);else if(i.center)a=t.getBoundingClientRect();else{var o=this.Reveal.getScale();a={x:t.offsetLeft*o,y:t.offsetTop*o,width:t.offsetWidth*o,height:t.offsetHeight*o}}r.x=a.x,r.y=a.y,r.width=a.width,r.height=a.height}var s=getComputedStyle(t);return(n.styles||i.autoAnimateStyles).forEach((function(t){var n;"string"==typeof t&&(t={property:t}),""!==(n=void 0!==t.from&&"from"===e?{value:t.from,explicitValue:!0}:void 0!==t.to&&"to"===e?{value:t.to,explicitValue:!0}:s[t.property])&&(r.styles[t.property]=n)})),r}},{key:"getAutoAnimatableElements",value:function(e,t){var n=("function"==typeof this.Reveal.getConfig().autoAnimateMatcher?this.Reveal.getConfig().autoAnimateMatcher:this.getAutoAnimatePairs).call(this,e,t),i=[];return n.filter((function(e,t){if(-1===i.indexOf(e.to))return i.push(e.to),!0}))}},{key:"getAutoAnimatePairs",value:function(e,t){var n=this,i=[],r="h1, h2, h3, h4, h5, h6, p, li";return this.findAutoAnimateMatches(i,e,t,"[data-id]",(function(e){return e.nodeName+":::"+e.getAttribute("data-id")})),this.findAutoAnimateMatches(i,e,t,r,(function(e){return e.nodeName+":::"+e.innerText})),this.findAutoAnimateMatches(i,e,t,"img, video, iframe",(function(e){return e.nodeName+":::"+(e.getAttribute("src")||e.getAttribute("data-src"))})),this.findAutoAnimateMatches(i,e,t,"pre",(function(e){return e.nodeName+":::"+e.innerText})),i.forEach((function(e){Eh(e.from,r)?e.options={scale:!1}:Eh(e.from,"pre")&&(e.options={scale:!1,styles:["width","height"]},n.findAutoAnimateMatches(i,e.from,e.to,".hljs .hljs-ln-code",(function(e){return e.textContent}),{scale:!1,styles:[],measure:n.getLocalBoundingBox.bind(n)}),n.findAutoAnimateMatches(i,e.from,e.to,".hljs .hljs-ln-line[data-line-number]",(function(e){return e.getAttribute("data-line-number")}),{scale:!1,styles:["width"],measure:n.getLocalBoundingBox.bind(n)}))}),this),i}},{key:"getLocalBoundingBox",value:function(e){var t=this.Reveal.getScale();return{x:Math.round(e.offsetLeft*t*100)/100,y:Math.round(e.offsetTop*t*100)/100,width:Math.round(e.offsetWidth*t*100)/100,height:Math.round(e.offsetHeight*t*100)/100}}},{key:"findAutoAnimateMatches",value:function(e,t,n,i,r,a){var o={},s={};[].slice.call(t.querySelectorAll(i)).forEach((function(e,t){var n=r(e);"string"==typeof n&&n.length&&(o[n]=o[n]||[],o[n].push(e))})),[].slice.call(n.querySelectorAll(i)).forEach((function(t,n){var i,l=r(t);if(s[l]=s[l]||[],s[l].push(t),o[l]){var c=s[l].length-1,u=o[l].length-1;o[l][c]?(i=o[l][c],o[l][c]=null):o[l][u]&&(i=o[l][u],o[l][u]=null)}i&&e.push({from:i,to:t,options:a})}))}},{key:"getUnmatchedAutoAnimateElements",value:function(e){var t=this;return[].slice.call(e.children).reduce((function(e,n){var i=n.querySelector("[data-auto-animate-target]");return n.hasAttribute("data-auto-animate-target")||i||e.push(n),n.querySelector("[data-auto-animate-target]")&&(e=e.concat(t.getUnmatchedAutoAnimateElements(n))),e}),[])}}]),e}(),cf=function(){function e(t){ki(this,e),this.Reveal=t}return Ri(e,[{key:"configure",value:function(e,t){!1===e.fragments?this.disable():!1===t.fragments&&this.enable()}},{key:"disable",value:function(){yh(this.Reveal.getSlidesElement(),".fragment").forEach((function(e){e.classList.add("visible"),e.classList.remove("current-fragment")}))}},{key:"enable",value:function(){yh(this.Reveal.getSlidesElement(),".fragment").forEach((function(e){e.classList.remove("visible"),e.classList.remove("current-fragment")}))}},{key:"availableRoutes",value:function(){var e=this.Reveal.getCurrentSlide();if(e&&this.Reveal.getConfig().fragments){var t=e.querySelectorAll(".fragment:not(.disabled)"),n=e.querySelectorAll(".fragment:not(.disabled):not(.visible)");return{prev:t.length-n.length>0,next:!!n.length}}return{prev:!1,next:!1}}},{key:"sort",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]&&arguments[1];e=Array.from(e);var n=[],i=[],r=[];e.forEach((function(e){if(e.hasAttribute("data-fragment-index")){var t=parseInt(e.getAttribute("data-fragment-index"),10);n[t]||(n[t]=[]),n[t].push(e)}else i.push([e])})),n=n.concat(i);var a=0;return n.forEach((function(e){e.forEach((function(e){r.push(e),e.setAttribute("data-fragment-index",a)})),a++})),!0===t?n:r}},{key:"sortAll",value:function(){var e=this;this.Reveal.getHorizontalSlides().forEach((function(t){var n=yh(t,"section");n.forEach((function(t,n){e.sort(t.querySelectorAll(".fragment"))}),e),0===n.length&&e.sort(t.querySelectorAll(".fragment"))}))}},{key:"update",value:function(e,t){var n=this,i={shown:[],hidden:[]},r=this.Reveal.getCurrentSlide();if(r&&this.Reveal.getConfig().fragments&&(t=t||this.sort(r.querySelectorAll(".fragment"))).length){var a=0;if("number"!=typeof e){var o=this.sort(r.querySelectorAll(".fragment.visible")).pop();o&&(e=parseInt(o.getAttribute("data-fragment-index")||0,10))}Array.from(t).forEach((function(t,r){if(t.hasAttribute("data-fragment-index")&&(r=parseInt(t.getAttribute("data-fragment-index"),10)),a=Math.max(a,r),r<=e){var o=t.classList.contains("visible");t.classList.add("visible"),t.classList.remove("current-fragment"),r===e&&(n.Reveal.announceStatus(n.Reveal.getStatusText(t)),t.classList.add("current-fragment"),n.Reveal.slideContent.startEmbeddedContent(t)),o||(i.shown.push(t),n.Reveal.dispatchEvent({target:t,type:"visible",bubbles:!1}))}else{var s=t.classList.contains("visible");t.classList.remove("visible"),t.classList.remove("current-fragment"),s&&(n.Reveal.slideContent.stopEmbeddedContent(t),i.hidden.push(t),n.Reveal.dispatchEvent({target:t,type:"hidden",bubbles:!1}))}})),e="number"==typeof e?e:-1,e=Math.max(Math.min(e,a),-1),r.setAttribute("data-fragment",e)}return i}},{key:"sync",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.Reveal.getCurrentSlide();return this.sort(e.querySelectorAll(".fragment"))}},{key:"goto",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:0,n=this.Reveal.getCurrentSlide();if(n&&this.Reveal.getConfig().fragments){var i=this.sort(n.querySelectorAll(".fragment:not(.disabled)"));if(i.length){if("number"!=typeof e){var r=this.sort(n.querySelectorAll(".fragment:not(.disabled).visible")).pop();e=r?parseInt(r.getAttribute("data-fragment-index")||0,10):-1}e+=t;var a=this.update(e,i);return a.hidden.length&&this.Reveal.dispatchEvent({type:"fragmenthidden",data:{fragment:a.hidden[0],fragments:a.hidden}}),a.shown.length&&this.Reveal.dispatchEvent({type:"fragmentshown",data:{fragment:a.shown[0],fragments:a.shown}}),this.Reveal.controls.update(),this.Reveal.progress.update(),this.Reveal.getConfig().fragmentInURL&&this.Reveal.location.writeURL(),!(!a.shown.length&&!a.hidden.length)}}return!1}},{key:"next",value:function(){return this.goto(null,1)}},{key:"prev",value:function(){return this.goto(null,-1)}}]),e}(),uf=function(){function e(t){ki(this,e),this.Reveal=t,this.active=!1,this.onSlideClicked=this.onSlideClicked.bind(this)}return Ri(e,[{key:"activate",value:function(){var e=this;if(this.Reveal.getConfig().overview&&!this.isActive()){this.active=!0,this.Reveal.getRevealElement().classList.add("overview"),this.Reveal.cancelAutoSlide(),this.Reveal.getSlidesElement().appendChild(this.Reveal.getBackgroundsElement()),yh(this.Reveal.getRevealElement(),tf).forEach((function(t){t.classList.contains("stack")||t.addEventListener("click",e.onSlideClicked,!0)}));var t=this.Reveal.getComputedSlideSize();this.overviewSlideWidth=t.width+70,this.overviewSlideHeight=t.height+70,this.Reveal.getConfig().rtl&&(this.overviewSlideWidth=-this.overviewSlideWidth),this.Reveal.updateSlidesVisibility(),this.layout(),this.update(),this.Reveal.layout();var n=this.Reveal.getIndices();this.Reveal.dispatchEvent({type:"overviewshown",data:{indexh:n.h,indexv:n.v,currentSlide:this.Reveal.getCurrentSlide()}})}}},{key:"layout",value:function(){var e=this;this.Reveal.getHorizontalSlides().forEach((function(t,n){t.setAttribute("data-index-h",n),Sh(t,"translate3d("+n*e.overviewSlideWidth+"px, 0, 0)"),t.classList.contains("stack")&&yh(t,"section").forEach((function(t,i){t.setAttribute("data-index-h",n),t.setAttribute("data-index-v",i),Sh(t,"translate3d(0, "+i*e.overviewSlideHeight+"px, 0)")}))})),Array.from(this.Reveal.getBackgroundsElement().childNodes).forEach((function(t,n){Sh(t,"translate3d("+n*e.overviewSlideWidth+"px, 0, 0)"),yh(t,".slide-background").forEach((function(t,n){Sh(t,"translate3d(0, "+n*e.overviewSlideHeight+"px, 0)")}))}))}},{key:"update",value:function(){var e=Math.min(window.innerWidth,window.innerHeight),t=Math.max(e/5,150)/e,n=this.Reveal.getIndices();this.Reveal.transformSlides({overview:["scale("+t+")","translateX("+-n.h*this.overviewSlideWidth+"px)","translateY("+-n.v*this.overviewSlideHeight+"px)"].join(" ")})}},{key:"deactivate",value:function(){var e=this;if(this.Reveal.getConfig().overview){this.active=!1,this.Reveal.getRevealElement().classList.remove("overview"),this.Reveal.getRevealElement().classList.add("overview-deactivating"),setTimeout((function(){e.Reveal.getRevealElement().classList.remove("overview-deactivating")}),1),this.Reveal.getRevealElement().appendChild(this.Reveal.getBackgroundsElement()),yh(this.Reveal.getRevealElement(),tf).forEach((function(t){Sh(t,""),t.removeEventListener("click",e.onSlideClicked,!0)})),yh(this.Reveal.getBackgroundsElement(),".slide-background").forEach((function(e){Sh(e,"")})),this.Reveal.transformSlides({overview:""});var t=this.Reveal.getIndices();this.Reveal.slide(t.h,t.v),this.Reveal.layout(),this.Reveal.cueAutoSlide(),this.Reveal.dispatchEvent({type:"overviewhidden",data:{indexh:t.h,indexv:t.v,currentSlide:this.Reveal.getCurrentSlide()}})}}},{key:"toggle",value:function(e){"boolean"==typeof e?e?this.activate():this.deactivate():this.isActive()?this.deactivate():this.activate()}},{key:"isActive",value:function(){return this.active}},{key:"onSlideClicked",value:function(e){if(this.isActive()){e.preventDefault();for(var t=e.target;t&&!t.nodeName.match(/section/gi);)t=t.parentNode;if(t&&!t.classList.contains("disabled")&&(this.deactivate(),t.nodeName.match(/section/gi))){var n=parseInt(t.getAttribute("data-index-h"),10),i=parseInt(t.getAttribute("data-index-v"),10);this.Reveal.slide(n,i)}}}}]),e}(),df=function(){function e(t){ki(this,e),this.Reveal=t,this.shortcuts={},this.bindings={},this.onDocumentKeyDown=this.onDocumentKeyDown.bind(this),this.onDocumentKeyPress=this.onDocumentKeyPress.bind(this)}return Ri(e,[{key:"configure",value:function(e,t){"linear"===e.navigationMode?(this.shortcuts["&#8594;  ,  &#8595;  ,  SPACE  ,  N  ,  L  ,  J"]="Next slide",this.shortcuts["&#8592;  ,  &#8593;  ,  P  ,  H  ,  K"]="Previous slide"):(this.shortcuts["N  ,  SPACE"]="Next 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this.bindings}},{key:"onDocumentKeyPress",value:function(e){e.shiftKey&&63===e.charCode&&this.Reveal.toggleHelp()}},{key:"onDocumentKeyDown",value:function(e){var t=this.Reveal.getConfig();if("function"==typeof t.keyboardCondition&&!1===t.keyboardCondition(e))return!0;if("focused"===t.keyboardCondition&&!this.Reveal.isFocused())return!0;var n=e.keyCode,i=!this.Reveal.isAutoSliding();this.Reveal.onUserInput(e);var r=document.activeElement&&!0===document.activeElement.isContentEditable,a=document.activeElement&&document.activeElement.tagName&&/input|textarea/i.test(document.activeElement.tagName),o=document.activeElement&&document.activeElement.className&&/speaker-notes/i.test(document.activeElement.className),s=!(-1!==[32,37,38,39,40,78,80].indexOf(e.keyCode)&&e.shiftKey||e.altKey)&&(e.shiftKey||e.altKey||e.ctrlKey||e.metaKey);if(!(r||a||o||s)){var l,c=[66,86,190,191];if("object"===Si(t.keyboard))for(l in 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l=this.getAutoAnimatableElements(e,t).map((function(e){return n.autoAnimateElements(e.from,e.to,e.options||{},o,sf++)}));if(s&&(e.style.display="none"),"false"!==t.dataset.autoAnimateUnmatched&&!0===this.Reveal.getConfig().autoAnimateUnmatched){var c=.8*o.duration,u=.2*o.duration;this.getUnmatchedAutoAnimateElements(t).forEach((function(e){var t=n.getAutoAnimateOptions(e,o),i="unmatched";t.duration===o.duration&&t.delay===o.delay||(i="unmatched-"+sf++,l.push('[data-auto-animate="running"] [data-auto-animate-target="'.concat(i,'"] { transition: opacity ').concat(t.duration,"s ease ").concat(t.delay,"s; }"))),e.dataset.autoAnimateTarget=i}),this),l.push('[data-auto-animate="running"] [data-auto-animate-target="unmatched"] { transition: opacity '.concat(c,"s ease ").concat(u,"s; 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i=kh(e.parentNode,"[data-auto-animate-target]");i&&(n=this.getAutoAnimateOptions(i,n))}return e.dataset.autoAnimateEasing&&(n.easing=e.dataset.autoAnimateEasing),e.dataset.autoAnimateDuration&&(n.duration=parseFloat(e.dataset.autoAnimateDuration)),e.dataset.autoAnimateDelay&&(n.delay=parseFloat(e.dataset.autoAnimateDelay)),n}},{key:"getAutoAnimatableProperties",value:function(e,t,n){var i=this.Reveal.getConfig(),r={styles:[]};if(!1!==n.translate||!1!==n.scale){var a;if("function"==typeof n.measure)a=n.measure(t);else if(i.center)a=t.getBoundingClientRect();else{var o=this.Reveal.getScale();a={x:t.offsetLeft*o,y:t.offsetTop*o,width:t.offsetWidth*o,height:t.offsetHeight*o}}r.x=a.x,r.y=a.y,r.width=a.width,r.height=a.height}var s=getComputedStyle(t);return(n.styles||i.autoAnimateStyles).forEach((function(t){var n;"string"==typeof t&&(t={property:t}),""!==(n=void 0!==t.from&&"from"===e?{value:t.from,explicitValue:!0}:void 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o=this.sort(r.querySelectorAll(".fragment.visible")).pop();o&&(e=parseInt(o.getAttribute("data-fragment-index")||0,10))}Array.from(t).forEach((function(t,r){if(t.hasAttribute("data-fragment-index")&&(r=parseInt(t.getAttribute("data-fragment-index"),10)),a=Math.max(a,r),r<=e){var o=t.classList.contains("visible");t.classList.add("visible"),t.classList.remove("current-fragment"),r===e&&(n.Reveal.announceStatus(n.Reveal.getStatusText(t)),t.classList.add("current-fragment"),n.Reveal.slideContent.startEmbeddedContent(t)),o||(i.shown.push(t),n.Reveal.dispatchEvent({target:t,type:"visible",bubbles:!1}))}else{var s=t.classList.contains("visible");t.classList.remove("visible"),t.classList.remove("current-fragment"),s&&(n.Reveal.slideContent.stopEmbeddedContent(t),i.hidden.push(t),n.Reveal.dispatchEvent({target:t,type:"hidden",bubbles:!1}))}})),e="number"==typeof e?e:-1,e=Math.max(Math.min(e,a),-1),r.setAttribute("data-fragment",e)}return i}},{key:"sync",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:this.Reveal.getCurrentSlide();return this.sort(e.querySelectorAll(".fragment"))}},{key:"goto",value:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:0,n=this.Reveal.getCurrentSlide();if(n&&this.Reveal.getConfig().fragments){var i=this.sort(n.querySelectorAll(".fragment:not(.disabled)"));if(i.length){if("number"!=typeof e){var r=this.sort(n.querySelectorAll(".fragment:not(.disabled).visible")).pop();e=r?parseInt(r.getAttribute("data-fragment-index")||0,10):-1}e+=t;var a=this.update(e,i);return 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e=this;if(this.Reveal.getConfig().overview&&!this.isActive()){this.active=!0,this.Reveal.getRevealElement().classList.add("overview"),this.Reveal.cancelAutoSlide(),this.Reveal.getSlidesElement().appendChild(this.Reveal.getBackgroundsElement()),yh(this.Reveal.getRevealElement(),tf).forEach((function(t){t.classList.contains("stack")||t.addEventListener("click",e.onSlideClicked,!0)}));var t=this.Reveal.getComputedSlideSize();this.overviewSlideWidth=t.width+70,this.overviewSlideHeight=t.height+70,this.Reveal.getConfig().rtl&&(this.overviewSlideWidth=-this.overviewSlideWidth),this.Reveal.updateSlidesVisibility(),this.layout(),this.update(),this.Reveal.layout();var n=this.Reveal.getIndices();this.Reveal.dispatchEvent({type:"overviewshown",data:{indexh:n.h,indexv:n.v,currentSlide:this.Reveal.getCurrentSlide()}})}}},{key:"layout",value:function(){var e=this;this.Reveal.getHorizontalSlides().forEach((function(t,n){t.setAttribute("data-index-h",n),Sh(t,"translate3d("+n*e.overviewSlideWidth+"px, 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e=this;if(this.Reveal.getConfig().overview){this.active=!1,this.Reveal.getRevealElement().classList.remove("overview"),this.Reveal.getRevealElement().classList.add("overview-deactivating"),setTimeout((function(){e.Reveal.getRevealElement().classList.remove("overview-deactivating")}),1),this.Reveal.getRevealElement().appendChild(this.Reveal.getBackgroundsElement()),yh(this.Reveal.getRevealElement(),tf).forEach((function(t){Sh(t,""),t.removeEventListener("click",e.onSlideClicked,!0)})),yh(this.Reveal.getBackgroundsElement(),".slide-background").forEach((function(e){Sh(e,"")})),this.Reveal.transformSlides({overview:""});var t=this.Reveal.getIndices();this.Reveal.slide(t.h,t.v),this.Reveal.layout(),this.Reveal.cueAutoSlide(),this.Reveal.dispatchEvent({type:"overviewhidden",data:{indexh:t.h,indexv:t.v,currentSlide:this.Reveal.getCurrentSlide()}})}}},{key:"toggle",value:function(e){"boolean"==typeof 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this.bindings}},{key:"onDocumentKeyPress",value:function(e){e.shiftKey&&63===e.charCode&&this.Reveal.toggleHelp()}},{key:"onDocumentKeyDown",value:function(e){var t=this.Reveal.getConfig();if("function"==typeof t.keyboardCondition&&!1===t.keyboardCondition(e))return!0;if("focused"===t.keyboardCondition&&!this.Reveal.isFocused())return!0;var n=e.keyCode,i=!this.Reveal.isAutoSliding();this.Reveal.onUserInput(e);var r=document.activeElement&&!0===document.activeElement.isContentEditable,a=document.activeElement&&document.activeElement.tagName&&/input|textarea/i.test(document.activeElement.tagName),o=document.activeElement&&document.activeElement.className&&/speaker-notes/i.test(document.activeElement.className),s=!(-1!==[32,37,38,39,40,78,80].indexOf(e.keyCode)&&e.shiftKey||e.altKey)&&(e.shiftKey||e.altKey||e.ctrlKey||e.metaKey);if(!(r||a||o||s)){var l,c=[66,86,190,191];if("object"===Si(t.keyboard))for(l in 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e(t){ki(this,e),xi(this,"MAX_REPLACE_STATE_FREQUENCY",1e3),this.Reveal=t,this.writeURLTimeout=0,this.replaceStateTimestamp=0,this.onWindowHashChange=this.onWindowHashChange.bind(this)}return Ri(e,[{key:"bind",value:function(){window.addEventListener("hashchange",this.onWindowHashChange,!1)}},{key:"unbind",value:function(){window.removeEventListener("hashchange",this.onWindowHashChange,!1)}},{key:"getIndicesFromHash",value:function(){var e,t,n=arguments.length>0&&void 0!==arguments[0]?arguments[0]:window.location.hash,i=n.replace(/^#\/?/,""),r=i.split("/");if(/^[0-9]*$/.test(r[0])||!i.length){var a,o=this.Reveal.getConfig(),s=o.hashOneBasedIndex?1:0,l=parseInt(r[0],10)-s||0,c=parseInt(r[1],10)-s||0;return o.fragmentInURL&&(a=parseInt(r[2],10),isNaN(a)&&(a=void 0)),{h:l,v:c,f:a}}/\/[-\d]+$/g.test(i)&&(t=parseInt(i.split("/").pop(),10),t=isNaN(t)?void 0:t,i=i.split("/").shift());try{e=document.getElementById(decodeURIComponent(i))}catch(e){}return 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require('../internals/require-object-coercible');\n\n// `ToObject` abstract operation\n// https://tc39.es/ecma262/#sec-toobject\nmodule.exports = function (argument) {\n  return Object(requireObjectCoercible(argument));\n};\n","var toObject = require('../internals/to-object');\n\nvar hasOwnProperty = {}.hasOwnProperty;\n\nmodule.exports = function hasOwn(it, key) {\n  return hasOwnProperty.call(toObject(it), key);\n};\n","var global = require('../internals/global');\nvar isObject = require('../internals/is-object');\n\nvar document = global.document;\n// typeof document.createElement is 'object' in old IE\nvar EXISTS = isObject(document) && isObject(document.createElement);\n\nmodule.exports = function (it) {\n  return EXISTS ? document.createElement(it) : {};\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar fails = require('../internals/fails');\nvar createElement = require('../internals/document-create-element');\n\n// Thank's IE8 for his funny defineProperty\nmodule.exports = !DESCRIPTORS && !fails(function () {\n  // eslint-disable-next-line es/no-object-defineproperty -- requied for testing\n  return Object.defineProperty(createElement('div'), 'a', {\n    get: function () { return 7; }\n  }).a != 7;\n});\n","var DESCRIPTORS = require('../internals/descriptors');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar toPrimitive = require('../internals/to-primitive');\nvar has = require('../internals/has');\nvar IE8_DOM_DEFINE = require('../internals/ie8-dom-define');\n\n// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe\nvar $getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;\n\n// `Object.getOwnPropertyDescriptor` method\n// https://tc39.es/ecma262/#sec-object.getownpropertydescriptor\nexports.f = DESCRIPTORS ? $getOwnPropertyDescriptor : function getOwnPropertyDescriptor(O, P) {\n  O = toIndexedObject(O);\n  P = toPrimitive(P, true);\n  if (IE8_DOM_DEFINE) try {\n    return $getOwnPropertyDescriptor(O, P);\n  } catch (error) { /* empty */ }\n  if (has(O, P)) return createPropertyDescriptor(!propertyIsEnumerableModule.f.call(O, P), O[P]);\n};\n","var isObject = require('../internals/is-object');\n\nmodule.exports = function (it) {\n  if (!isObject(it)) {\n    throw TypeError(String(it) + ' is not an object');\n  } return it;\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar IE8_DOM_DEFINE = require('../internals/ie8-dom-define');\nvar anObject = require('../internals/an-object');\nvar toPrimitive = require('../internals/to-primitive');\n\n// eslint-disable-next-line es/no-object-defineproperty -- safe\nvar $defineProperty = Object.defineProperty;\n\n// `Object.defineProperty` method\n// https://tc39.es/ecma262/#sec-object.defineproperty\nexports.f = DESCRIPTORS ? $defineProperty : function defineProperty(O, P, Attributes) {\n  anObject(O);\n  P = toPrimitive(P, true);\n  anObject(Attributes);\n  if (IE8_DOM_DEFINE) try {\n    return $defineProperty(O, P, Attributes);\n  } catch (error) { /* empty */ }\n  if ('get' in Attributes || 'set' in Attributes) throw TypeError('Accessors not supported');\n  if ('value' in Attributes) O[P] = Attributes.value;\n  return O;\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar definePropertyModule = require('../internals/object-define-property');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\n\nmodule.exports = DESCRIPTORS ? function (object, key, value) {\n  return definePropertyModule.f(object, key, createPropertyDescriptor(1, value));\n} : function (object, key, value) {\n  object[key] = value;\n  return object;\n};\n","var global = require('../internals/global');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nmodule.exports = function (key, value) {\n  try {\n    createNonEnumerableProperty(global, key, value);\n  } catch (error) {\n    global[key] = value;\n  } return value;\n};\n","var global = require('../internals/global');\nvar setGlobal = require('../internals/set-global');\n\nvar SHARED = '__core-js_shared__';\nvar store = global[SHARED] || setGlobal(SHARED, {});\n\nmodule.exports = store;\n","var store = require('../internals/shared-store');\n\nvar functionToString = Function.toString;\n\n// this helper broken in `3.4.1-3.4.4`, so we can't use `shared` helper\nif (typeof store.inspectSource != 'function') {\n  store.inspectSource = function (it) {\n    return functionToString.call(it);\n  };\n}\n\nmodule.exports = store.inspectSource;\n","var global = require('../internals/global');\nvar inspectSource = require('../internals/inspect-source');\n\nvar WeakMap = global.WeakMap;\n\nmodule.exports = typeof WeakMap === 'function' && /native code/.test(inspectSource(WeakMap));\n","var IS_PURE = require('../internals/is-pure');\nvar store = require('../internals/shared-store');\n\n(module.exports = function (key, value) {\n  return store[key] || (store[key] = value !== undefined ? value : {});\n})('versions', []).push({\n  version: '3.12.1',\n  mode: IS_PURE ? 'pure' : 'global',\n  copyright: '© 2021 Denis Pushkarev (zloirock.ru)'\n});\n","var id = 0;\nvar postfix = Math.random();\n\nmodule.exports = function (key) {\n  return 'Symbol(' + String(key === undefined ? '' : key) + ')_' + (++id + postfix).toString(36);\n};\n","var NATIVE_WEAK_MAP = require('../internals/native-weak-map');\nvar global = require('../internals/global');\nvar isObject = require('../internals/is-object');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar objectHas = require('../internals/has');\nvar shared = require('../internals/shared-store');\nvar sharedKey = require('../internals/shared-key');\nvar hiddenKeys = require('../internals/hidden-keys');\n\nvar OBJECT_ALREADY_INITIALIZED = 'Object already initialized';\nvar WeakMap = global.WeakMap;\nvar set, get, has;\n\nvar enforce = function (it) {\n  return has(it) ? get(it) : set(it, {});\n};\n\nvar getterFor = function (TYPE) {\n  return function (it) {\n    var state;\n    if (!isObject(it) || (state = get(it)).type !== TYPE) {\n      throw TypeError('Incompatible receiver, ' + TYPE + ' required');\n    } return state;\n  };\n};\n\nif (NATIVE_WEAK_MAP || shared.state) {\n  var store = shared.state || (shared.state = new WeakMap());\n  var wmget = store.get;\n  var wmhas = store.has;\n  var wmset = store.set;\n  set = function (it, metadata) {\n    if (wmhas.call(store, it)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);\n    metadata.facade = it;\n    wmset.call(store, it, metadata);\n    return metadata;\n  };\n  get = function (it) {\n    return wmget.call(store, it) || {};\n  };\n  has = function (it) {\n    return wmhas.call(store, it);\n  };\n} else {\n  var STATE = sharedKey('state');\n  hiddenKeys[STATE] = true;\n  set = function (it, metadata) {\n    if (objectHas(it, STATE)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);\n    metadata.facade = it;\n    createNonEnumerableProperty(it, STATE, metadata);\n    return metadata;\n  };\n  get = function (it) {\n    return objectHas(it, STATE) ? it[STATE] : {};\n  };\n  has = function (it) {\n    return objectHas(it, STATE);\n  };\n}\n\nmodule.exports = {\n  set: set,\n  get: get,\n  has: has,\n  enforce: enforce,\n  getterFor: getterFor\n};\n","var shared = require('../internals/shared');\nvar uid = require('../internals/uid');\n\nvar keys = shared('keys');\n\nmodule.exports = function (key) {\n  return keys[key] || (keys[key] = uid(key));\n};\n","module.exports = {};\n","var global = require('../internals/global');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar has = require('../internals/has');\nvar setGlobal = require('../internals/set-global');\nvar inspectSource = require('../internals/inspect-source');\nvar InternalStateModule = require('../internals/internal-state');\n\nvar getInternalState = InternalStateModule.get;\nvar enforceInternalState = InternalStateModule.enforce;\nvar TEMPLATE = String(String).split('String');\n\n(module.exports = function (O, key, value, options) {\n  var unsafe = options ? !!options.unsafe : false;\n  var simple = options ? !!options.enumerable : false;\n  var noTargetGet = options ? !!options.noTargetGet : false;\n  var state;\n  if (typeof value == 'function') {\n    if (typeof key == 'string' && !has(value, 'name')) {\n      createNonEnumerableProperty(value, 'name', key);\n    }\n    state = enforceInternalState(value);\n    if (!state.source) {\n      state.source = TEMPLATE.join(typeof key == 'string' ? key : '');\n    }\n  }\n  if (O === global) {\n    if (simple) O[key] = value;\n    else setGlobal(key, value);\n    return;\n  } else if (!unsafe) {\n    delete O[key];\n  } else if (!noTargetGet && O[key]) {\n    simple = true;\n  }\n  if (simple) O[key] = value;\n  else createNonEnumerableProperty(O, key, value);\n// add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative\n})(Function.prototype, 'toString', function toString() {\n  return typeof this == 'function' && getInternalState(this).source || inspectSource(this);\n});\n","var global = require('../internals/global');\n\nmodule.exports = global;\n","var path = require('../internals/path');\nvar global = require('../internals/global');\n\nvar aFunction = function (variable) {\n  return typeof variable == 'function' ? variable : undefined;\n};\n\nmodule.exports = function (namespace, method) {\n  return arguments.length < 2 ? aFunction(path[namespace]) || aFunction(global[namespace])\n    : path[namespace] && path[namespace][method] || global[namespace] && global[namespace][method];\n};\n","var ceil = Math.ceil;\nvar floor = Math.floor;\n\n// `ToInteger` abstract operation\n// https://tc39.es/ecma262/#sec-tointeger\nmodule.exports = function (argument) {\n  return isNaN(argument = +argument) ? 0 : (argument > 0 ? floor : ceil)(argument);\n};\n","var toInteger = require('../internals/to-integer');\n\nvar min = Math.min;\n\n// `ToLength` abstract operation\n// https://tc39.es/ecma262/#sec-tolength\nmodule.exports = function (argument) {\n  return argument > 0 ? min(toInteger(argument), 0x1FFFFFFFFFFFFF) : 0; // 2 ** 53 - 1 == 9007199254740991\n};\n","var toInteger = require('../internals/to-integer');\n\nvar max = Math.max;\nvar min = Math.min;\n\n// Helper for a popular repeating case of the spec:\n// Let integer be ? ToInteger(index).\n// If integer < 0, let result be max((length + integer), 0); else let result be min(integer, length).\nmodule.exports = function (index, length) {\n  var integer = toInteger(index);\n  return integer < 0 ? max(integer + length, 0) : min(integer, length);\n};\n","var toIndexedObject = require('../internals/to-indexed-object');\nvar toLength = require('../internals/to-length');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\n\n// `Array.prototype.{ indexOf, includes }` methods implementation\nvar createMethod = function (IS_INCLUDES) {\n  return function ($this, el, fromIndex) {\n    var O = toIndexedObject($this);\n    var length = toLength(O.length);\n    var index = toAbsoluteIndex(fromIndex, length);\n    var value;\n    // Array#includes uses SameValueZero equality algorithm\n    // eslint-disable-next-line no-self-compare -- NaN check\n    if (IS_INCLUDES && el != el) while (length > index) {\n      value = O[index++];\n      // eslint-disable-next-line no-self-compare -- NaN check\n      if (value != value) return true;\n    // Array#indexOf ignores holes, Array#includes - not\n    } else for (;length > index; index++) {\n      if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;\n    } return !IS_INCLUDES && -1;\n  };\n};\n\nmodule.exports = {\n  // `Array.prototype.includes` method\n  // https://tc39.es/ecma262/#sec-array.prototype.includes\n  includes: createMethod(true),\n  // `Array.prototype.indexOf` method\n  // https://tc39.es/ecma262/#sec-array.prototype.indexof\n  indexOf: createMethod(false)\n};\n","var has = require('../internals/has');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar indexOf = require('../internals/array-includes').indexOf;\nvar hiddenKeys = require('../internals/hidden-keys');\n\nmodule.exports = function (object, names) {\n  var O = toIndexedObject(object);\n  var i = 0;\n  var result = [];\n  var key;\n  for (key in O) !has(hiddenKeys, key) && has(O, key) && result.push(key);\n  // Don't enum bug & hidden keys\n  while (names.length > i) if (has(O, key = names[i++])) {\n    ~indexOf(result, key) || result.push(key);\n  }\n  return result;\n};\n","// IE8- don't enum bug keys\nmodule.exports = [\n  'constructor',\n  'hasOwnProperty',\n  'isPrototypeOf',\n  'propertyIsEnumerable',\n  'toLocaleString',\n  'toString',\n  'valueOf'\n];\n","var internalObjectKeys = require('../internals/object-keys-internal');\nvar enumBugKeys = require('../internals/enum-bug-keys');\n\nvar hiddenKeys = enumBugKeys.concat('length', 'prototype');\n\n// `Object.getOwnPropertyNames` method\n// https://tc39.es/ecma262/#sec-object.getownpropertynames\n// eslint-disable-next-line es/no-object-getownpropertynames -- safe\nexports.f = Object.getOwnPropertyNames || function getOwnPropertyNames(O) {\n  return internalObjectKeys(O, hiddenKeys);\n};\n","// eslint-disable-next-line es/no-object-getownpropertysymbols -- safe\nexports.f = Object.getOwnPropertySymbols;\n","var getBuiltIn = require('../internals/get-built-in');\nvar getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar anObject = require('../internals/an-object');\n\n// all object keys, includes non-enumerable and symbols\nmodule.exports = getBuiltIn('Reflect', 'ownKeys') || function ownKeys(it) {\n  var keys = getOwnPropertyNamesModule.f(anObject(it));\n  var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;\n  return getOwnPropertySymbols ? keys.concat(getOwnPropertySymbols(it)) : keys;\n};\n","var has = require('../internals/has');\nvar ownKeys = require('../internals/own-keys');\nvar getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');\nvar definePropertyModule = require('../internals/object-define-property');\n\nmodule.exports = function (target, source) {\n  var keys = ownKeys(source);\n  var defineProperty = definePropertyModule.f;\n  var getOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;\n  for (var i = 0; i < keys.length; i++) {\n    var key = keys[i];\n    if (!has(target, key)) defineProperty(target, key, getOwnPropertyDescriptor(source, key));\n  }\n};\n","var fails = require('../internals/fails');\n\nvar replacement = /#|\\.prototype\\./;\n\nvar isForced = function (feature, detection) {\n  var value = data[normalize(feature)];\n  return value == POLYFILL ? true\n    : value == NATIVE ? false\n    : typeof detection == 'function' ? fails(detection)\n    : !!detection;\n};\n\nvar normalize = isForced.normalize = function (string) {\n  return String(string).replace(replacement, '.').toLowerCase();\n};\n\nvar data = isForced.data = {};\nvar NATIVE = isForced.NATIVE = 'N';\nvar POLYFILL = isForced.POLYFILL = 'P';\n\nmodule.exports = isForced;\n","var global = require('../internals/global');\nvar getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar setGlobal = require('../internals/set-global');\nvar copyConstructorProperties = require('../internals/copy-constructor-properties');\nvar isForced = require('../internals/is-forced');\n\n/*\n  options.target      - name of the target object\n  options.global      - target is the global object\n  options.stat        - export as static methods of target\n  options.proto       - export as prototype methods of target\n  options.real        - real prototype method for the `pure` version\n  options.forced      - export even if the native feature is available\n  options.bind        - bind methods to the target, required for the `pure` version\n  options.wrap        - wrap constructors to preventing global pollution, required for the `pure` version\n  options.unsafe      - use the simple assignment of property instead of delete + defineProperty\n  options.sham        - add a flag to not completely full polyfills\n  options.enumerable  - export as enumerable property\n  options.noTargetGet - prevent calling a getter on target\n*/\nmodule.exports = function (options, source) {\n  var TARGET = options.target;\n  var GLOBAL = options.global;\n  var STATIC = options.stat;\n  var FORCED, target, key, targetProperty, sourceProperty, descriptor;\n  if (GLOBAL) {\n    target = global;\n  } else if (STATIC) {\n    target = global[TARGET] || setGlobal(TARGET, {});\n  } else {\n    target = (global[TARGET] || {}).prototype;\n  }\n  if (target) for (key in source) {\n    sourceProperty = source[key];\n    if (options.noTargetGet) {\n      descriptor = getOwnPropertyDescriptor(target, key);\n      targetProperty = descriptor && descriptor.value;\n    } else targetProperty = target[key];\n    FORCED = isForced(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced);\n    // contained in target\n    if (!FORCED && targetProperty !== undefined) {\n      if (typeof sourceProperty === typeof targetProperty) continue;\n      copyConstructorProperties(sourceProperty, targetProperty);\n    }\n    // add a flag to not completely full polyfills\n    if (options.sham || (targetProperty && targetProperty.sham)) {\n      createNonEnumerableProperty(sourceProperty, 'sham', true);\n    }\n    // extend global\n    redefine(target, key, sourceProperty, options);\n  }\n};\n","var internalObjectKeys = require('../internals/object-keys-internal');\nvar enumBugKeys = require('../internals/enum-bug-keys');\n\n// `Object.keys` method\n// https://tc39.es/ecma262/#sec-object.keys\n// eslint-disable-next-line es/no-object-keys -- safe\nmodule.exports = Object.keys || function keys(O) {\n  return internalObjectKeys(O, enumBugKeys);\n};\n","'use strict';\nvar DESCRIPTORS = require('../internals/descriptors');\nvar fails = require('../internals/fails');\nvar objectKeys = require('../internals/object-keys');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar toObject = require('../internals/to-object');\nvar IndexedObject = require('../internals/indexed-object');\n\n// eslint-disable-next-line es/no-object-assign -- safe\nvar $assign = Object.assign;\n// eslint-disable-next-line es/no-object-defineproperty -- required for testing\nvar defineProperty = Object.defineProperty;\n\n// `Object.assign` method\n// https://tc39.es/ecma262/#sec-object.assign\nmodule.exports = !$assign || fails(function () {\n  // should have correct order of operations (Edge bug)\n  if (DESCRIPTORS && $assign({ b: 1 }, $assign(defineProperty({}, 'a', {\n    enumerable: true,\n    get: function () {\n      defineProperty(this, 'b', {\n        value: 3,\n        enumerable: false\n      });\n    }\n  }), { b: 2 })).b !== 1) return true;\n  // should work with symbols and should have deterministic property order (V8 bug)\n  var A = {};\n  var B = {};\n  // eslint-disable-next-line es/no-symbol -- safe\n  var symbol = Symbol();\n  var alphabet = 'abcdefghijklmnopqrst';\n  A[symbol] = 7;\n  alphabet.split('').forEach(function (chr) { B[chr] = chr; });\n  return $assign({}, A)[symbol] != 7 || objectKeys($assign({}, B)).join('') != alphabet;\n}) ? function assign(target, source) { // eslint-disable-line no-unused-vars -- required for `.length`\n  var T = toObject(target);\n  var argumentsLength = arguments.length;\n  var index = 1;\n  var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;\n  var propertyIsEnumerable = propertyIsEnumerableModule.f;\n  while (argumentsLength > index) {\n    var S = IndexedObject(arguments[index++]);\n    var keys = getOwnPropertySymbols ? objectKeys(S).concat(getOwnPropertySymbols(S)) : objectKeys(S);\n    var length = keys.length;\n    var j = 0;\n    var key;\n    while (length > j) {\n      key = keys[j++];\n      if (!DESCRIPTORS || propertyIsEnumerable.call(S, key)) T[key] = S[key];\n    }\n  } return T;\n} : $assign;\n","var $ = require('../internals/export');\nvar assign = require('../internals/object-assign');\n\n// `Object.assign` method\n// https://tc39.es/ecma262/#sec-object.assign\n// eslint-disable-next-line es/no-object-assign -- required for testing\n$({ target: 'Object', stat: true, forced: Object.assign !== assign }, {\n  assign: assign\n});\n","var global = require('../internals/global');\nvar userAgent = require('../internals/engine-user-agent');\n\nvar process = global.process;\nvar versions = process && process.versions;\nvar v8 = versions && versions.v8;\nvar match, version;\n\nif (v8) {\n  match = v8.split('.');\n  version = match[0] < 4 ? 1 : match[0] + match[1];\n} else if (userAgent) {\n  match = userAgent.match(/Edge\\/(\\d+)/);\n  if (!match || match[1] >= 74) {\n    match = userAgent.match(/Chrome\\/(\\d+)/);\n    if (match) version = match[1];\n  }\n}\n\nmodule.exports = version && +version;\n","module.exports = function (it) {\n  if (typeof it != 'function') {\n    throw TypeError(String(it) + ' is not a function');\n  } return it;\n};\n","var aFunction = require('../internals/a-function');\n\n// optional / simple context binding\nmodule.exports = function (fn, that, length) {\n  aFunction(fn);\n  if (that === undefined) return fn;\n  switch (length) {\n    case 0: return function () {\n      return fn.call(that);\n    };\n    case 1: return function (a) {\n      return fn.call(that, a);\n    };\n    case 2: return function (a, b) {\n      return fn.call(that, a, b);\n    };\n    case 3: return function (a, b, c) {\n      return fn.call(that, a, b, c);\n    };\n  }\n  return function (/* ...args */) {\n    return fn.apply(that, arguments);\n  };\n};\n","var classof = require('../internals/classof-raw');\n\n// `IsArray` abstract operation\n// https://tc39.es/ecma262/#sec-isarray\n// eslint-disable-next-line es/no-array-isarray -- safe\nmodule.exports = Array.isArray || function isArray(arg) {\n  return classof(arg) == 'Array';\n};\n","var getBuiltIn = require('../internals/get-built-in');\n\nmodule.exports = getBuiltIn('navigator', 'userAgent') || '';\n","/* eslint-disable es/no-symbol -- required for testing */\nvar V8_VERSION = require('../internals/engine-v8-version');\nvar fails = require('../internals/fails');\n\n// eslint-disable-next-line es/no-object-getownpropertysymbols -- required for testing\nmodule.exports = !!Object.getOwnPropertySymbols && !fails(function () {\n  return !String(Symbol()) ||\n    // Chrome 38 Symbol has incorrect toString conversion\n    // Chrome 38-40 symbols are not inherited from DOM collections prototypes to instances\n    !Symbol.sham && V8_VERSION && V8_VERSION < 41;\n});\n","/* eslint-disable es/no-symbol -- required for testing */\nvar NATIVE_SYMBOL = require('../internals/native-symbol');\n\nmodule.exports = NATIVE_SYMBOL\n  && !Symbol.sham\n  && typeof Symbol.iterator == 'symbol';\n","var global = require('../internals/global');\nvar shared = require('../internals/shared');\nvar has = require('../internals/has');\nvar uid = require('../internals/uid');\nvar NATIVE_SYMBOL = require('../internals/native-symbol');\nvar USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');\n\nvar WellKnownSymbolsStore = shared('wks');\nvar Symbol = global.Symbol;\nvar createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter || uid;\n\nmodule.exports = function (name) {\n  if (!has(WellKnownSymbolsStore, name) || !(NATIVE_SYMBOL || typeof WellKnownSymbolsStore[name] == 'string')) {\n    if (NATIVE_SYMBOL && has(Symbol, name)) {\n      WellKnownSymbolsStore[name] = Symbol[name];\n    } else {\n      WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);\n    }\n  } return WellKnownSymbolsStore[name];\n};\n","var isObject = require('../internals/is-object');\nvar isArray = require('../internals/is-array');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar SPECIES = wellKnownSymbol('species');\n\n// `ArraySpeciesCreate` abstract operation\n// https://tc39.es/ecma262/#sec-arrayspeciescreate\nmodule.exports = function (originalArray, length) {\n  var C;\n  if (isArray(originalArray)) {\n    C = originalArray.constructor;\n    // cross-realm fallback\n    if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;\n    else if (isObject(C)) {\n      C = C[SPECIES];\n      if (C === null) C = undefined;\n    }\n  } return new (C === undefined ? Array : C)(length === 0 ? 0 : length);\n};\n","var bind = require('../internals/function-bind-context');\nvar IndexedObject = require('../internals/indexed-object');\nvar toObject = require('../internals/to-object');\nvar toLength = require('../internals/to-length');\nvar arraySpeciesCreate = require('../internals/array-species-create');\n\nvar push = [].push;\n\n// `Array.prototype.{ forEach, map, filter, some, every, find, findIndex, filterOut }` methods implementation\nvar createMethod = function (TYPE) {\n  var IS_MAP = TYPE == 1;\n  var IS_FILTER = TYPE == 2;\n  var IS_SOME = TYPE == 3;\n  var IS_EVERY = TYPE == 4;\n  var IS_FIND_INDEX = TYPE == 6;\n  var IS_FILTER_OUT = TYPE == 7;\n  var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;\n  return function ($this, callbackfn, that, specificCreate) {\n    var O = toObject($this);\n    var self = IndexedObject(O);\n    var boundFunction = bind(callbackfn, that, 3);\n    var length = toLength(self.length);\n    var index = 0;\n    var create = specificCreate || arraySpeciesCreate;\n    var target = IS_MAP ? create($this, length) : IS_FILTER || IS_FILTER_OUT ? create($this, 0) : undefined;\n    var value, result;\n    for (;length > index; index++) if (NO_HOLES || index in self) {\n      value = self[index];\n      result = boundFunction(value, index, O);\n      if (TYPE) {\n        if (IS_MAP) target[index] = result; // map\n        else if (result) switch (TYPE) {\n          case 3: return true;              // some\n          case 5: return value;             // find\n          case 6: return index;             // findIndex\n          case 2: push.call(target, value); // filter\n        } else switch (TYPE) {\n          case 4: return false;             // every\n          case 7: push.call(target, value); // filterOut\n        }\n      }\n    }\n    return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;\n  };\n};\n\nmodule.exports = {\n  // `Array.prototype.forEach` method\n  // https://tc39.es/ecma262/#sec-array.prototype.foreach\n  forEach: createMethod(0),\n  // `Array.prototype.map` method\n  // https://tc39.es/ecma262/#sec-array.prototype.map\n  map: createMethod(1),\n  // `Array.prototype.filter` method\n  // https://tc39.es/ecma262/#sec-array.prototype.filter\n  filter: createMethod(2),\n  // `Array.prototype.some` method\n  // https://tc39.es/ecma262/#sec-array.prototype.some\n  some: createMethod(3),\n  // `Array.prototype.every` method\n  // https://tc39.es/ecma262/#sec-array.prototype.every\n  every: createMethod(4),\n  // `Array.prototype.find` method\n  // https://tc39.es/ecma262/#sec-array.prototype.find\n  find: createMethod(5),\n  // `Array.prototype.findIndex` method\n  // https://tc39.es/ecma262/#sec-array.prototype.findIndex\n  findIndex: createMethod(6),\n  // `Array.prototype.filterOut` method\n  // https://github.com/tc39/proposal-array-filtering\n  filterOut: createMethod(7)\n};\n","var fails = require('../internals/fails');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar V8_VERSION = require('../internals/engine-v8-version');\n\nvar SPECIES = wellKnownSymbol('species');\n\nmodule.exports = function (METHOD_NAME) {\n  // We can't use this feature detection in V8 since it causes\n  // deoptimization and serious performance degradation\n  // https://github.com/zloirock/core-js/issues/677\n  return V8_VERSION >= 51 || !fails(function () {\n    var array = [];\n    var constructor = array.constructor = {};\n    constructor[SPECIES] = function () {\n      return { foo: 1 };\n    };\n    return array[METHOD_NAME](Boolean).foo !== 1;\n  });\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar $map = require('../internals/array-iteration').map;\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('map');\n\n// `Array.prototype.map` method\n// https://tc39.es/ecma262/#sec-array.prototype.map\n// with adding support of @@species\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {\n  map: function map(callbackfn /* , thisArg */) {\n    return $map(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n  }\n});\n","'use strict';\nvar toPrimitive = require('../internals/to-primitive');\nvar definePropertyModule = require('../internals/object-define-property');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\n\nmodule.exports = function (object, key, value) {\n  var propertyKey = toPrimitive(key);\n  if (propertyKey in object) definePropertyModule.f(object, propertyKey, createPropertyDescriptor(0, value));\n  else object[propertyKey] = value;\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar fails = require('../internals/fails');\nvar isArray = require('../internals/is-array');\nvar isObject = require('../internals/is-object');\nvar toObject = require('../internals/to-object');\nvar toLength = require('../internals/to-length');\nvar createProperty = require('../internals/create-property');\nvar arraySpeciesCreate = require('../internals/array-species-create');\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar V8_VERSION = require('../internals/engine-v8-version');\n\nvar IS_CONCAT_SPREADABLE = wellKnownSymbol('isConcatSpreadable');\nvar MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;\nvar MAXIMUM_ALLOWED_INDEX_EXCEEDED = 'Maximum allowed index exceeded';\n\n// We can't use this feature detection in V8 since it causes\n// deoptimization and serious performance degradation\n// https://github.com/zloirock/core-js/issues/679\nvar IS_CONCAT_SPREADABLE_SUPPORT = V8_VERSION >= 51 || !fails(function () {\n  var array = [];\n  array[IS_CONCAT_SPREADABLE] = false;\n  return array.concat()[0] !== array;\n});\n\nvar SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('concat');\n\nvar isConcatSpreadable = function (O) {\n  if (!isObject(O)) return false;\n  var spreadable = O[IS_CONCAT_SPREADABLE];\n  return spreadable !== undefined ? !!spreadable : isArray(O);\n};\n\nvar FORCED = !IS_CONCAT_SPREADABLE_SUPPORT || !SPECIES_SUPPORT;\n\n// `Array.prototype.concat` method\n// https://tc39.es/ecma262/#sec-array.prototype.concat\n// with adding support of @@isConcatSpreadable and @@species\n$({ target: 'Array', proto: true, forced: FORCED }, {\n  // eslint-disable-next-line no-unused-vars -- required for `.length`\n  concat: function concat(arg) {\n    var O = toObject(this);\n    var A = arraySpeciesCreate(O, 0);\n    var n = 0;\n    var i, k, length, len, E;\n    for (i = -1, length = arguments.length; i < length; i++) {\n      E = i === -1 ? O : arguments[i];\n      if (isConcatSpreadable(E)) {\n        len = toLength(E.length);\n        if (n + len > MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);\n        for (k = 0; k < len; k++, n++) if (k in E) createProperty(A, n, E[k]);\n      } else {\n        if (n >= MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);\n        createProperty(A, n++, E);\n      }\n    }\n    A.length = n;\n    return A;\n  }\n});\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\nvar test = {};\n\ntest[TO_STRING_TAG] = 'z';\n\nmodule.exports = String(test) === '[object z]';\n","var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar classofRaw = require('../internals/classof-raw');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\n// ES3 wrong here\nvar CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) == 'Arguments';\n\n// fallback for IE11 Script Access Denied error\nvar tryGet = function (it, key) {\n  try {\n    return it[key];\n  } catch (error) { /* empty */ }\n};\n\n// getting tag from ES6+ `Object.prototype.toString`\nmodule.exports = TO_STRING_TAG_SUPPORT ? classofRaw : function (it) {\n  var O, tag, result;\n  return it === undefined ? 'Undefined' : it === null ? 'Null'\n    // @@toStringTag case\n    : typeof (tag = tryGet(O = Object(it), TO_STRING_TAG)) == 'string' ? tag\n    // builtinTag case\n    : CORRECT_ARGUMENTS ? classofRaw(O)\n    // ES3 arguments fallback\n    : (result = classofRaw(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : result;\n};\n","'use strict';\nvar TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar classof = require('../internals/classof');\n\n// `Object.prototype.toString` method implementation\n// https://tc39.es/ecma262/#sec-object.prototype.tostring\nmodule.exports = TO_STRING_TAG_SUPPORT ? {}.toString : function toString() {\n  return '[object ' + classof(this) + ']';\n};\n","var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar redefine = require('../internals/redefine');\nvar toString = require('../internals/object-to-string');\n\n// `Object.prototype.toString` method\n// https://tc39.es/ecma262/#sec-object.prototype.tostring\nif (!TO_STRING_TAG_SUPPORT) {\n  redefine(Object.prototype, 'toString', toString, { unsafe: true });\n}\n","var global = require('../internals/global');\n\nmodule.exports = global.Promise;\n","var redefine = require('../internals/redefine');\n\nmodule.exports = function (target, src, options) {\n  for (var key in src) redefine(target, key, src[key], options);\n  return target;\n};\n","var isObject = require('../internals/is-object');\n\nmodule.exports = function (it) {\n  if (!isObject(it) && it !== null) {\n    throw TypeError(\"Can't set \" + String(it) + ' as a prototype');\n  } return it;\n};\n","/* eslint-disable no-proto -- safe */\nvar anObject = require('../internals/an-object');\nvar aPossiblePrototype = require('../internals/a-possible-prototype');\n\n// `Object.setPrototypeOf` method\n// https://tc39.es/ecma262/#sec-object.setprototypeof\n// Works with __proto__ only. Old v8 can't work with null proto objects.\n// eslint-disable-next-line es/no-object-setprototypeof -- safe\nmodule.exports = Object.setPrototypeOf || ('__proto__' in {} ? function () {\n  var CORRECT_SETTER = false;\n  var test = {};\n  var setter;\n  try {\n    // eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe\n    setter = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').set;\n    setter.call(test, []);\n    CORRECT_SETTER = test instanceof Array;\n  } catch (error) { /* empty */ }\n  return function setPrototypeOf(O, proto) {\n    anObject(O);\n    aPossiblePrototype(proto);\n    if (CORRECT_SETTER) setter.call(O, proto);\n    else O.__proto__ = proto;\n    return O;\n  };\n}() : undefined);\n","var defineProperty = require('../internals/object-define-property').f;\nvar has = require('../internals/has');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\n\nmodule.exports = function (it, TAG, STATIC) {\n  if (it && !has(it = STATIC ? it : it.prototype, TO_STRING_TAG)) {\n    defineProperty(it, TO_STRING_TAG, { configurable: true, value: TAG });\n  }\n};\n","'use strict';\nvar getBuiltIn = require('../internals/get-built-in');\nvar definePropertyModule = require('../internals/object-define-property');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar DESCRIPTORS = require('../internals/descriptors');\n\nvar SPECIES = wellKnownSymbol('species');\n\nmodule.exports = function (CONSTRUCTOR_NAME) {\n  var Constructor = getBuiltIn(CONSTRUCTOR_NAME);\n  var defineProperty = definePropertyModule.f;\n\n  if (DESCRIPTORS && Constructor && !Constructor[SPECIES]) {\n    defineProperty(Constructor, SPECIES, {\n      configurable: true,\n      get: function () { return this; }\n    });\n  }\n};\n","module.exports = {};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\nvar Iterators = require('../internals/iterators');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar ArrayPrototype = Array.prototype;\n\n// check on default Array iterator\nmodule.exports = function (it) {\n  return it !== undefined && (Iterators.Array === it || ArrayPrototype[ITERATOR] === it);\n};\n","var classof = require('../internals/classof');\nvar Iterators = require('../internals/iterators');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar ITERATOR = wellKnownSymbol('iterator');\n\nmodule.exports = function (it) {\n  if (it != undefined) return it[ITERATOR]\n    || it['@@iterator']\n    || Iterators[classof(it)];\n};\n","var anObject = require('../internals/an-object');\n\nmodule.exports = function (iterator) {\n  var returnMethod = iterator['return'];\n  if (returnMethod !== undefined) {\n    return anObject(returnMethod.call(iterator)).value;\n  }\n};\n","var anObject = require('../internals/an-object');\nvar isArrayIteratorMethod = require('../internals/is-array-iterator-method');\nvar toLength = require('../internals/to-length');\nvar bind = require('../internals/function-bind-context');\nvar getIteratorMethod = require('../internals/get-iterator-method');\nvar iteratorClose = require('../internals/iterator-close');\n\nvar Result = function (stopped, result) {\n  this.stopped = stopped;\n  this.result = result;\n};\n\nmodule.exports = function (iterable, unboundFunction, options) {\n  var that = options && options.that;\n  var AS_ENTRIES = !!(options && options.AS_ENTRIES);\n  var IS_ITERATOR = !!(options && options.IS_ITERATOR);\n  var INTERRUPTED = !!(options && options.INTERRUPTED);\n  var fn = bind(unboundFunction, that, 1 + AS_ENTRIES + INTERRUPTED);\n  var iterator, iterFn, index, length, result, next, step;\n\n  var stop = function (condition) {\n    if (iterator) iteratorClose(iterator);\n    return new Result(true, condition);\n  };\n\n  var callFn = function (value) {\n    if (AS_ENTRIES) {\n      anObject(value);\n      return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);\n    } return INTERRUPTED ? fn(value, stop) : fn(value);\n  };\n\n  if (IS_ITERATOR) {\n    iterator = iterable;\n  } else {\n    iterFn = getIteratorMethod(iterable);\n    if (typeof iterFn != 'function') throw TypeError('Target is not iterable');\n    // optimisation for array iterators\n    if (isArrayIteratorMethod(iterFn)) {\n      for (index = 0, length = toLength(iterable.length); length > index; index++) {\n        result = callFn(iterable[index]);\n        if (result && result instanceof Result) return result;\n      } return new Result(false);\n    }\n    iterator = iterFn.call(iterable);\n  }\n\n  next = iterator.next;\n  while (!(step = next.call(iterator)).done) {\n    try {\n      result = callFn(step.value);\n    } catch (error) {\n      iteratorClose(iterator);\n      throw error;\n    }\n    if (typeof result == 'object' && result && result instanceof Result) return result;\n  } return new Result(false);\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar SAFE_CLOSING = false;\n\ntry {\n  var called = 0;\n  var iteratorWithReturn = {\n    next: function () {\n      return { done: !!called++ };\n    },\n    'return': function () {\n      SAFE_CLOSING = true;\n    }\n  };\n  iteratorWithReturn[ITERATOR] = function () {\n    return this;\n  };\n  // eslint-disable-next-line es/no-array-from, no-throw-literal -- required for testing\n  Array.from(iteratorWithReturn, function () { throw 2; });\n} catch (error) { /* empty */ }\n\nmodule.exports = function (exec, SKIP_CLOSING) {\n  if (!SKIP_CLOSING && !SAFE_CLOSING) return false;\n  var ITERATION_SUPPORT = false;\n  try {\n    var object = {};\n    object[ITERATOR] = function () {\n      return {\n        next: function () {\n          return { done: ITERATION_SUPPORT = true };\n        }\n      };\n    };\n    exec(object);\n  } catch (error) { /* empty */ }\n  return ITERATION_SUPPORT;\n};\n","var global = require('../internals/global');\nvar fails = require('../internals/fails');\nvar bind = require('../internals/function-bind-context');\nvar html = require('../internals/html');\nvar createElement = require('../internals/document-create-element');\nvar IS_IOS = require('../internals/engine-is-ios');\nvar IS_NODE = require('../internals/engine-is-node');\n\nvar location = global.location;\nvar set = global.setImmediate;\nvar clear = global.clearImmediate;\nvar process = global.process;\nvar MessageChannel = global.MessageChannel;\nvar Dispatch = global.Dispatch;\nvar counter = 0;\nvar queue = {};\nvar ONREADYSTATECHANGE = 'onreadystatechange';\nvar defer, channel, port;\n\nvar run = function (id) {\n  // eslint-disable-next-line no-prototype-builtins -- safe\n  if (queue.hasOwnProperty(id)) {\n    var fn = queue[id];\n    delete queue[id];\n    fn();\n  }\n};\n\nvar runner = function (id) {\n  return function () {\n    run(id);\n  };\n};\n\nvar listener = function (event) {\n  run(event.data);\n};\n\nvar post = function (id) {\n  // old engines have not location.origin\n  global.postMessage(id + '', location.protocol + '//' + location.host);\n};\n\n// Node.js 0.9+ & IE10+ has setImmediate, otherwise:\nif (!set || !clear) {\n  set = function setImmediate(fn) {\n    var args = [];\n    var i = 1;\n    while (arguments.length > i) args.push(arguments[i++]);\n    queue[++counter] = function () {\n      // eslint-disable-next-line no-new-func -- spec requirement\n      (typeof fn == 'function' ? fn : Function(fn)).apply(undefined, args);\n    };\n    defer(counter);\n    return counter;\n  };\n  clear = function clearImmediate(id) {\n    delete queue[id];\n  };\n  // Node.js 0.8-\n  if (IS_NODE) {\n    defer = function (id) {\n      process.nextTick(runner(id));\n    };\n  // Sphere (JS game engine) Dispatch API\n  } else if (Dispatch && Dispatch.now) {\n    defer = function (id) {\n      Dispatch.now(runner(id));\n    };\n  // Browsers with MessageChannel, includes WebWorkers\n  // except iOS - https://github.com/zloirock/core-js/issues/624\n  } else if (MessageChannel && !IS_IOS) {\n    channel = new MessageChannel();\n    port = channel.port2;\n    channel.port1.onmessage = listener;\n    defer = bind(port.postMessage, port, 1);\n  // Browsers with postMessage, skip WebWorkers\n  // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'\n  } else if (\n    global.addEventListener &&\n    typeof postMessage == 'function' &&\n    !global.importScripts &&\n    location && location.protocol !== 'file:' &&\n    !fails(post)\n  ) {\n    defer = post;\n    global.addEventListener('message', listener, false);\n  // IE8-\n  } else if (ONREADYSTATECHANGE in createElement('script')) {\n    defer = function (id) {\n      html.appendChild(createElement('script'))[ONREADYSTATECHANGE] = function () {\n        html.removeChild(this);\n        run(id);\n      };\n    };\n  // Rest old browsers\n  } else {\n    defer = function (id) {\n      setTimeout(runner(id), 0);\n    };\n  }\n}\n\nmodule.exports = {\n  set: set,\n  clear: clear\n};\n","var anObject = require('../internals/an-object');\nvar aFunction = require('../internals/a-function');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar SPECIES = wellKnownSymbol('species');\n\n// `SpeciesConstructor` abstract operation\n// https://tc39.es/ecma262/#sec-speciesconstructor\nmodule.exports = function (O, defaultConstructor) {\n  var C = anObject(O).constructor;\n  var S;\n  return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? defaultConstructor : aFunction(S);\n};\n","var getBuiltIn = require('../internals/get-built-in');\n\nmodule.exports = getBuiltIn('document', 'documentElement');\n","var userAgent = require('../internals/engine-user-agent');\n\nmodule.exports = /(?:iphone|ipod|ipad).*applewebkit/i.test(userAgent);\n","var classof = require('../internals/classof-raw');\nvar global = require('../internals/global');\n\nmodule.exports = classof(global.process) == 'process';\n","var global = require('../internals/global');\nvar getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;\nvar macrotask = require('../internals/task').set;\nvar IS_IOS = require('../internals/engine-is-ios');\nvar IS_WEBOS_WEBKIT = require('../internals/engine-is-webos-webkit');\nvar IS_NODE = require('../internals/engine-is-node');\n\nvar MutationObserver = global.MutationObserver || global.WebKitMutationObserver;\nvar document = global.document;\nvar process = global.process;\nvar Promise = global.Promise;\n// Node.js 11 shows ExperimentalWarning on getting `queueMicrotask`\nvar queueMicrotaskDescriptor = getOwnPropertyDescriptor(global, 'queueMicrotask');\nvar queueMicrotask = queueMicrotaskDescriptor && queueMicrotaskDescriptor.value;\n\nvar flush, head, last, notify, toggle, node, promise, then;\n\n// modern engines have queueMicrotask method\nif (!queueMicrotask) {\n  flush = function () {\n    var parent, fn;\n    if (IS_NODE && (parent = process.domain)) parent.exit();\n    while (head) {\n      fn = head.fn;\n      head = head.next;\n      try {\n        fn();\n      } catch (error) {\n        if (head) notify();\n        else last = undefined;\n        throw error;\n      }\n    } last = undefined;\n    if (parent) parent.enter();\n  };\n\n  // browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339\n  // also except WebOS Webkit https://github.com/zloirock/core-js/issues/898\n  if (!IS_IOS && !IS_NODE && !IS_WEBOS_WEBKIT && MutationObserver && document) {\n    toggle = true;\n    node = document.createTextNode('');\n    new MutationObserver(flush).observe(node, { characterData: true });\n    notify = function () {\n      node.data = toggle = !toggle;\n    };\n  // environments with maybe non-completely correct, but existent Promise\n  } else if (Promise && Promise.resolve) {\n    // Promise.resolve without an argument throws an error in LG WebOS 2\n    promise = Promise.resolve(undefined);\n    // workaround of WebKit ~ iOS Safari 10.1 bug\n    promise.constructor = Promise;\n    then = promise.then;\n    notify = function () {\n      then.call(promise, flush);\n    };\n  // Node.js without promises\n  } else if (IS_NODE) {\n    notify = function () {\n      process.nextTick(flush);\n    };\n  // for other environments - macrotask based on:\n  // - setImmediate\n  // - MessageChannel\n  // - window.postMessag\n  // - onreadystatechange\n  // - setTimeout\n  } else {\n    notify = function () {\n      // strange IE + webpack dev server bug - use .call(global)\n      macrotask.call(global, flush);\n    };\n  }\n}\n\nmodule.exports = queueMicrotask || function (fn) {\n  var task = { fn: fn, next: undefined };\n  if (last) last.next = task;\n  if (!head) {\n    head = task;\n    notify();\n  } last = task;\n};\n","var userAgent = require('../internals/engine-user-agent');\n\nmodule.exports = /web0s(?!.*chrome)/i.test(userAgent);\n","'use strict';\nvar aFunction = require('../internals/a-function');\n\nvar PromiseCapability = function (C) {\n  var resolve, reject;\n  this.promise = new C(function ($$resolve, $$reject) {\n    if (resolve !== undefined || reject !== undefined) throw TypeError('Bad Promise constructor');\n    resolve = $$resolve;\n    reject = $$reject;\n  });\n  this.resolve = aFunction(resolve);\n  this.reject = aFunction(reject);\n};\n\n// 25.4.1.5 NewPromiseCapability(C)\nmodule.exports.f = function (C) {\n  return new PromiseCapability(C);\n};\n","var anObject = require('../internals/an-object');\nvar isObject = require('../internals/is-object');\nvar newPromiseCapability = require('../internals/new-promise-capability');\n\nmodule.exports = function (C, x) {\n  anObject(C);\n  if (isObject(x) && x.constructor === C) return x;\n  var promiseCapability = newPromiseCapability.f(C);\n  var resolve = promiseCapability.resolve;\n  resolve(x);\n  return promiseCapability.promise;\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar IS_PURE = require('../internals/is-pure');\nvar global = require('../internals/global');\nvar getBuiltIn = require('../internals/get-built-in');\nvar NativePromise = require('../internals/native-promise-constructor');\nvar redefine = require('../internals/redefine');\nvar redefineAll = require('../internals/redefine-all');\nvar setPrototypeOf = require('../internals/object-set-prototype-of');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar setSpecies = require('../internals/set-species');\nvar isObject = require('../internals/is-object');\nvar aFunction = require('../internals/a-function');\nvar anInstance = require('../internals/an-instance');\nvar inspectSource = require('../internals/inspect-source');\nvar iterate = require('../internals/iterate');\nvar checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');\nvar speciesConstructor = require('../internals/species-constructor');\nvar task = require('../internals/task').set;\nvar microtask = require('../internals/microtask');\nvar promiseResolve = require('../internals/promise-resolve');\nvar hostReportErrors = require('../internals/host-report-errors');\nvar newPromiseCapabilityModule = require('../internals/new-promise-capability');\nvar perform = require('../internals/perform');\nvar InternalStateModule = require('../internals/internal-state');\nvar isForced = require('../internals/is-forced');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_BROWSER = require('../internals/engine-is-browser');\nvar IS_NODE = require('../internals/engine-is-node');\nvar V8_VERSION = require('../internals/engine-v8-version');\n\nvar SPECIES = wellKnownSymbol('species');\nvar PROMISE = 'Promise';\nvar getInternalState = InternalStateModule.get;\nvar setInternalState = InternalStateModule.set;\nvar getInternalPromiseState = InternalStateModule.getterFor(PROMISE);\nvar NativePromisePrototype = NativePromise && NativePromise.prototype;\nvar PromiseConstructor = NativePromise;\nvar PromiseConstructorPrototype = NativePromisePrototype;\nvar TypeError = global.TypeError;\nvar document = global.document;\nvar process = global.process;\nvar newPromiseCapability = newPromiseCapabilityModule.f;\nvar newGenericPromiseCapability = newPromiseCapability;\nvar DISPATCH_EVENT = !!(document && document.createEvent && global.dispatchEvent);\nvar NATIVE_REJECTION_EVENT = typeof PromiseRejectionEvent == 'function';\nvar UNHANDLED_REJECTION = 'unhandledrejection';\nvar REJECTION_HANDLED = 'rejectionhandled';\nvar PENDING = 0;\nvar FULFILLED = 1;\nvar REJECTED = 2;\nvar HANDLED = 1;\nvar UNHANDLED = 2;\nvar SUBCLASSING = false;\nvar Internal, OwnPromiseCapability, PromiseWrapper, nativeThen;\n\nvar FORCED = isForced(PROMISE, function () {\n  var GLOBAL_CORE_JS_PROMISE = inspectSource(PromiseConstructor) !== String(PromiseConstructor);\n  // V8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=830565\n  // We can't detect it synchronously, so just check versions\n  if (!GLOBAL_CORE_JS_PROMISE && V8_VERSION === 66) return true;\n  // We need Promise#finally in the pure version for preventing prototype pollution\n  if (IS_PURE && !PromiseConstructorPrototype['finally']) return true;\n  // We can't use @@species feature detection in V8 since it causes\n  // deoptimization and performance degradation\n  // https://github.com/zloirock/core-js/issues/679\n  if (V8_VERSION >= 51 && /native code/.test(PromiseConstructor)) return false;\n  // Detect correctness of subclassing with @@species support\n  var promise = new PromiseConstructor(function (resolve) { resolve(1); });\n  var FakePromise = function (exec) {\n    exec(function () { /* empty */ }, function () { /* empty */ });\n  };\n  var constructor = promise.constructor = {};\n  constructor[SPECIES] = FakePromise;\n  SUBCLASSING = promise.then(function () { /* empty */ }) instanceof FakePromise;\n  if (!SUBCLASSING) return true;\n  // Unhandled rejections tracking support, NodeJS Promise without it fails @@species test\n  return !GLOBAL_CORE_JS_PROMISE && IS_BROWSER && !NATIVE_REJECTION_EVENT;\n});\n\nvar INCORRECT_ITERATION = FORCED || !checkCorrectnessOfIteration(function (iterable) {\n  PromiseConstructor.all(iterable)['catch'](function () { /* empty */ });\n});\n\n// helpers\nvar isThenable = function (it) {\n  var then;\n  return isObject(it) && typeof (then = it.then) == 'function' ? then : false;\n};\n\nvar notify = function (state, isReject) {\n  if (state.notified) return;\n  state.notified = true;\n  var chain = state.reactions;\n  microtask(function () {\n    var value = state.value;\n    var ok = state.state == FULFILLED;\n    var index = 0;\n    // variable length - can't use forEach\n    while (chain.length > index) {\n      var reaction = chain[index++];\n      var handler = ok ? reaction.ok : reaction.fail;\n      var resolve = reaction.resolve;\n      var reject = reaction.reject;\n      var domain = reaction.domain;\n      var result, then, exited;\n      try {\n        if (handler) {\n          if (!ok) {\n            if (state.rejection === UNHANDLED) onHandleUnhandled(state);\n            state.rejection = HANDLED;\n          }\n          if (handler === true) result = value;\n          else {\n            if (domain) domain.enter();\n            result = handler(value); // can throw\n            if (domain) {\n              domain.exit();\n              exited = true;\n            }\n          }\n          if (result === reaction.promise) {\n            reject(TypeError('Promise-chain cycle'));\n          } else if (then = isThenable(result)) {\n            then.call(result, resolve, reject);\n          } else resolve(result);\n        } else reject(value);\n      } catch (error) {\n        if (domain && !exited) domain.exit();\n        reject(error);\n      }\n    }\n    state.reactions = [];\n    state.notified = false;\n    if (isReject && !state.rejection) onUnhandled(state);\n  });\n};\n\nvar dispatchEvent = function (name, promise, reason) {\n  var event, handler;\n  if (DISPATCH_EVENT) {\n    event = document.createEvent('Event');\n    event.promise = promise;\n    event.reason = reason;\n    event.initEvent(name, false, true);\n    global.dispatchEvent(event);\n  } else event = { promise: promise, reason: reason };\n  if (!NATIVE_REJECTION_EVENT && (handler = global['on' + name])) handler(event);\n  else if (name === UNHANDLED_REJECTION) hostReportErrors('Unhandled promise rejection', reason);\n};\n\nvar onUnhandled = function (state) {\n  task.call(global, function () {\n    var promise = state.facade;\n    var value = state.value;\n    var IS_UNHANDLED = isUnhandled(state);\n    var result;\n    if (IS_UNHANDLED) {\n      result = perform(function () {\n        if (IS_NODE) {\n          process.emit('unhandledRejection', value, promise);\n        } else dispatchEvent(UNHANDLED_REJECTION, promise, value);\n      });\n      // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should\n      state.rejection = IS_NODE || isUnhandled(state) ? UNHANDLED : HANDLED;\n      if (result.error) throw result.value;\n    }\n  });\n};\n\nvar isUnhandled = function (state) {\n  return state.rejection !== HANDLED && !state.parent;\n};\n\nvar onHandleUnhandled = function (state) {\n  task.call(global, function () {\n    var promise = state.facade;\n    if (IS_NODE) {\n      process.emit('rejectionHandled', promise);\n    } else dispatchEvent(REJECTION_HANDLED, promise, state.value);\n  });\n};\n\nvar bind = function (fn, state, unwrap) {\n  return function (value) {\n    fn(state, value, unwrap);\n  };\n};\n\nvar internalReject = function (state, value, unwrap) {\n  if (state.done) return;\n  state.done = true;\n  if (unwrap) state = unwrap;\n  state.value = value;\n  state.state = REJECTED;\n  notify(state, true);\n};\n\nvar internalResolve = function (state, value, unwrap) {\n  if (state.done) return;\n  state.done = true;\n  if (unwrap) state = unwrap;\n  try {\n    if (state.facade === value) throw TypeError(\"Promise can't be resolved itself\");\n    var then = isThenable(value);\n    if (then) {\n      microtask(function () {\n        var wrapper = { done: false };\n        try {\n          then.call(value,\n            bind(internalResolve, wrapper, state),\n            bind(internalReject, wrapper, state)\n          );\n        } catch (error) {\n          internalReject(wrapper, error, state);\n        }\n      });\n    } else {\n      state.value = value;\n      state.state = FULFILLED;\n      notify(state, false);\n    }\n  } catch (error) {\n    internalReject({ done: false }, error, state);\n  }\n};\n\n// constructor polyfill\nif (FORCED) {\n  // 25.4.3.1 Promise(executor)\n  PromiseConstructor = function Promise(executor) {\n    anInstance(this, PromiseConstructor, PROMISE);\n    aFunction(executor);\n    Internal.call(this);\n    var state = getInternalState(this);\n    try {\n      executor(bind(internalResolve, state), bind(internalReject, state));\n    } catch (error) {\n      internalReject(state, error);\n    }\n  };\n  PromiseConstructorPrototype = PromiseConstructor.prototype;\n  // eslint-disable-next-line no-unused-vars -- required for `.length`\n  Internal = function Promise(executor) {\n    setInternalState(this, {\n      type: PROMISE,\n      done: false,\n      notified: false,\n      parent: false,\n      reactions: [],\n      rejection: false,\n      state: PENDING,\n      value: undefined\n    });\n  };\n  Internal.prototype = redefineAll(PromiseConstructorPrototype, {\n    // `Promise.prototype.then` method\n    // https://tc39.es/ecma262/#sec-promise.prototype.then\n    then: function then(onFulfilled, onRejected) {\n      var state = getInternalPromiseState(this);\n      var reaction = newPromiseCapability(speciesConstructor(this, PromiseConstructor));\n      reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true;\n      reaction.fail = typeof onRejected == 'function' && onRejected;\n      reaction.domain = IS_NODE ? process.domain : undefined;\n      state.parent = true;\n      state.reactions.push(reaction);\n      if (state.state != PENDING) notify(state, false);\n      return reaction.promise;\n    },\n    // `Promise.prototype.catch` method\n    // https://tc39.es/ecma262/#sec-promise.prototype.catch\n    'catch': function (onRejected) {\n      return this.then(undefined, onRejected);\n    }\n  });\n  OwnPromiseCapability = function () {\n    var promise = new Internal();\n    var state = getInternalState(promise);\n    this.promise = promise;\n    this.resolve = bind(internalResolve, state);\n    this.reject = bind(internalReject, state);\n  };\n  newPromiseCapabilityModule.f = newPromiseCapability = function (C) {\n    return C === PromiseConstructor || C === PromiseWrapper\n      ? new OwnPromiseCapability(C)\n      : newGenericPromiseCapability(C);\n  };\n\n  if (!IS_PURE && typeof NativePromise == 'function' && NativePromisePrototype !== Object.prototype) {\n    nativeThen = NativePromisePrototype.then;\n\n    if (!SUBCLASSING) {\n      // make `Promise#then` return a polyfilled `Promise` for native promise-based APIs\n      redefine(NativePromisePrototype, 'then', function then(onFulfilled, onRejected) {\n        var that = this;\n        return new PromiseConstructor(function (resolve, reject) {\n          nativeThen.call(that, resolve, reject);\n        }).then(onFulfilled, onRejected);\n      // https://github.com/zloirock/core-js/issues/640\n      }, { unsafe: true });\n\n      // makes sure that native promise-based APIs `Promise#catch` properly works with patched `Promise#then`\n      redefine(NativePromisePrototype, 'catch', PromiseConstructorPrototype['catch'], { unsafe: true });\n    }\n\n    // make `.constructor === Promise` work for native promise-based APIs\n    try {\n      delete NativePromisePrototype.constructor;\n    } catch (error) { /* empty */ }\n\n    // make `instanceof Promise` work for native promise-based APIs\n    if (setPrototypeOf) {\n      setPrototypeOf(NativePromisePrototype, PromiseConstructorPrototype);\n    }\n  }\n}\n\n$({ global: true, wrap: true, forced: FORCED }, {\n  Promise: PromiseConstructor\n});\n\nsetToStringTag(PromiseConstructor, PROMISE, false, true);\nsetSpecies(PROMISE);\n\nPromiseWrapper = getBuiltIn(PROMISE);\n\n// statics\n$({ target: PROMISE, stat: true, forced: FORCED }, {\n  // `Promise.reject` method\n  // https://tc39.es/ecma262/#sec-promise.reject\n  reject: function reject(r) {\n    var capability = newPromiseCapability(this);\n    capability.reject.call(undefined, r);\n    return capability.promise;\n  }\n});\n\n$({ target: PROMISE, stat: true, forced: IS_PURE || FORCED }, {\n  // `Promise.resolve` method\n  // https://tc39.es/ecma262/#sec-promise.resolve\n  resolve: function resolve(x) {\n    return promiseResolve(IS_PURE && this === PromiseWrapper ? PromiseConstructor : this, x);\n  }\n});\n\n$({ target: PROMISE, stat: true, forced: INCORRECT_ITERATION }, {\n  // `Promise.all` method\n  // https://tc39.es/ecma262/#sec-promise.all\n  all: function all(iterable) {\n    var C = this;\n    var capability = newPromiseCapability(C);\n    var resolve = capability.resolve;\n    var reject = capability.reject;\n    var result = perform(function () {\n      var $promiseResolve = aFunction(C.resolve);\n      var values = [];\n      var counter = 0;\n      var remaining = 1;\n      iterate(iterable, function (promise) {\n        var index = counter++;\n        var alreadyCalled = false;\n        values.push(undefined);\n        remaining++;\n        $promiseResolve.call(C, promise).then(function (value) {\n          if (alreadyCalled) return;\n          alreadyCalled = true;\n          values[index] = value;\n          --remaining || resolve(values);\n        }, reject);\n      });\n      --remaining || resolve(values);\n    });\n    if (result.error) reject(result.value);\n    return capability.promise;\n  },\n  // `Promise.race` method\n  // https://tc39.es/ecma262/#sec-promise.race\n  race: function race(iterable) {\n    var C = this;\n    var capability = newPromiseCapability(C);\n    var reject = capability.reject;\n    var result = perform(function () {\n      var $promiseResolve = aFunction(C.resolve);\n      iterate(iterable, function (promise) {\n        $promiseResolve.call(C, promise).then(capability.resolve, reject);\n      });\n    });\n    if (result.error) reject(result.value);\n    return capability.promise;\n  }\n});\n","var global = require('../internals/global');\n\nmodule.exports = function (a, b) {\n  var console = global.console;\n  if (console && console.error) {\n    arguments.length === 1 ? console.error(a) : console.error(a, b);\n  }\n};\n","module.exports = typeof window == 'object';\n","module.exports = function (it, Constructor, name) {\n  if (!(it instanceof Constructor)) {\n    throw TypeError('Incorrect ' + (name ? name + ' ' : '') + 'invocation');\n  } return it;\n};\n","module.exports = function (exec) {\n  try {\n    return { error: false, value: exec() };\n  } catch (error) {\n    return { error: true, value: error };\n  }\n};\n","'use strict';\nvar fails = require('../internals/fails');\n\nmodule.exports = function (METHOD_NAME, argument) {\n  var method = [][METHOD_NAME];\n  return !!method && fails(function () {\n    // eslint-disable-next-line no-useless-call,no-throw-literal -- required for testing\n    method.call(null, argument || function () { throw 1; }, 1);\n  });\n};\n","'use strict';\nvar $forEach = require('../internals/array-iteration').forEach;\nvar arrayMethodIsStrict = require('../internals/array-method-is-strict');\n\nvar STRICT_METHOD = arrayMethodIsStrict('forEach');\n\n// `Array.prototype.forEach` method implementation\n// https://tc39.es/ecma262/#sec-array.prototype.foreach\nmodule.exports = !STRICT_METHOD ? function forEach(callbackfn /* , thisArg */) {\n  return $forEach(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n// eslint-disable-next-line es/no-array-prototype-foreach -- safe\n} : [].forEach;\n","var global = require('../internals/global');\nvar DOMIterables = require('../internals/dom-iterables');\nvar forEach = require('../internals/array-for-each');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nfor (var COLLECTION_NAME in DOMIterables) {\n  var Collection = global[COLLECTION_NAME];\n  var CollectionPrototype = Collection && Collection.prototype;\n  // some Chrome versions have non-configurable methods on DOMTokenList\n  if (CollectionPrototype && CollectionPrototype.forEach !== forEach) try {\n    createNonEnumerableProperty(CollectionPrototype, 'forEach', forEach);\n  } catch (error) {\n    CollectionPrototype.forEach = forEach;\n  }\n}\n","// iterable DOM collections\n// flag - `iterable` interface - 'entries', 'keys', 'values', 'forEach' methods\nmodule.exports = {\n  CSSRuleList: 0,\n  CSSStyleDeclaration: 0,\n  CSSValueList: 0,\n  ClientRectList: 0,\n  DOMRectList: 0,\n  DOMStringList: 0,\n  DOMTokenList: 1,\n  DataTransferItemList: 0,\n  FileList: 0,\n  HTMLAllCollection: 0,\n  HTMLCollection: 0,\n  HTMLFormElement: 0,\n  HTMLSelectElement: 0,\n  MediaList: 0,\n  MimeTypeArray: 0,\n  NamedNodeMap: 0,\n  NodeList: 1,\n  PaintRequestList: 0,\n  Plugin: 0,\n  PluginArray: 0,\n  SVGLengthList: 0,\n  SVGNumberList: 0,\n  SVGPathSegList: 0,\n  SVGPointList: 0,\n  SVGStringList: 0,\n  SVGTransformList: 0,\n  SourceBufferList: 0,\n  StyleSheetList: 0,\n  TextTrackCueList: 0,\n  TextTrackList: 0,\n  TouchList: 0\n};\n","var anObject = require('../internals/an-object');\nvar iteratorClose = require('../internals/iterator-close');\n\n// call something on iterator step with safe closing on error\nmodule.exports = function (iterator, fn, value, ENTRIES) {\n  try {\n    return ENTRIES ? fn(anObject(value)[0], value[1]) : fn(value);\n  // 7.4.6 IteratorClose(iterator, completion)\n  } catch (error) {\n    iteratorClose(iterator);\n    throw error;\n  }\n};\n","'use strict';\nvar bind = require('../internals/function-bind-context');\nvar toObject = require('../internals/to-object');\nvar callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');\nvar isArrayIteratorMethod = require('../internals/is-array-iterator-method');\nvar toLength = require('../internals/to-length');\nvar createProperty = require('../internals/create-property');\nvar getIteratorMethod = require('../internals/get-iterator-method');\n\n// `Array.from` method implementation\n// https://tc39.es/ecma262/#sec-array.from\nmodule.exports = function from(arrayLike /* , mapfn = undefined, thisArg = undefined */) {\n  var O = toObject(arrayLike);\n  var C = typeof this == 'function' ? this : Array;\n  var argumentsLength = arguments.length;\n  var mapfn = argumentsLength > 1 ? arguments[1] : undefined;\n  var mapping = mapfn !== undefined;\n  var iteratorMethod = getIteratorMethod(O);\n  var index = 0;\n  var length, result, step, iterator, next, value;\n  if (mapping) mapfn = bind(mapfn, argumentsLength > 2 ? arguments[2] : undefined, 2);\n  // if the target is not iterable or it's an array with the default iterator - use a simple case\n  if (iteratorMethod != undefined && !(C == Array && isArrayIteratorMethod(iteratorMethod))) {\n    iterator = iteratorMethod.call(O);\n    next = iterator.next;\n    result = new C();\n    for (;!(step = next.call(iterator)).done; index++) {\n      value = mapping ? callWithSafeIterationClosing(iterator, mapfn, [step.value, index], true) : step.value;\n      createProperty(result, index, value);\n    }\n  } else {\n    length = toLength(O.length);\n    result = new C(length);\n    for (;length > index; index++) {\n      value = mapping ? mapfn(O[index], index) : O[index];\n      createProperty(result, index, value);\n    }\n  }\n  result.length = index;\n  return result;\n};\n","var $ = require('../internals/export');\nvar from = require('../internals/array-from');\nvar checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');\n\nvar INCORRECT_ITERATION = !checkCorrectnessOfIteration(function (iterable) {\n  // eslint-disable-next-line es/no-array-from -- required for testing\n  Array.from(iterable);\n});\n\n// `Array.from` method\n// https://tc39.es/ecma262/#sec-array.from\n$({ target: 'Array', stat: true, forced: INCORRECT_ITERATION }, {\n  from: from\n});\n","var toInteger = require('../internals/to-integer');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\n\n// `String.prototype.{ codePointAt, at }` methods implementation\nvar createMethod = function (CONVERT_TO_STRING) {\n  return function ($this, pos) {\n    var S = String(requireObjectCoercible($this));\n    var position = toInteger(pos);\n    var size = S.length;\n    var first, second;\n    if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;\n    first = S.charCodeAt(position);\n    return first < 0xD800 || first > 0xDBFF || position + 1 === size\n      || (second = S.charCodeAt(position + 1)) < 0xDC00 || second > 0xDFFF\n        ? CONVERT_TO_STRING ? S.charAt(position) : first\n        : CONVERT_TO_STRING ? S.slice(position, position + 2) : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;\n  };\n};\n\nmodule.exports = {\n  // `String.prototype.codePointAt` method\n  // https://tc39.es/ecma262/#sec-string.prototype.codepointat\n  codeAt: createMethod(false),\n  // `String.prototype.at` method\n  // https://github.com/mathiasbynens/String.prototype.at\n  charAt: createMethod(true)\n};\n","'use strict';\nvar fails = require('../internals/fails');\nvar getPrototypeOf = require('../internals/object-get-prototype-of');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar has = require('../internals/has');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_PURE = require('../internals/is-pure');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar BUGGY_SAFARI_ITERATORS = false;\n\nvar returnThis = function () { return this; };\n\n// `%IteratorPrototype%` object\n// https://tc39.es/ecma262/#sec-%iteratorprototype%-object\nvar IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;\n\n/* eslint-disable es/no-array-prototype-keys -- safe */\nif ([].keys) {\n  arrayIterator = [].keys();\n  // Safari 8 has buggy iterators w/o `next`\n  if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;\n  else {\n    PrototypeOfArrayIteratorPrototype = getPrototypeOf(getPrototypeOf(arrayIterator));\n    if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;\n  }\n}\n\nvar NEW_ITERATOR_PROTOTYPE = IteratorPrototype == undefined || fails(function () {\n  var test = {};\n  // FF44- legacy iterators case\n  return IteratorPrototype[ITERATOR].call(test) !== test;\n});\n\nif (NEW_ITERATOR_PROTOTYPE) IteratorPrototype = {};\n\n// 25.1.2.1.1 %IteratorPrototype%[@@iterator]()\nif ((!IS_PURE || NEW_ITERATOR_PROTOTYPE) && !has(IteratorPrototype, ITERATOR)) {\n  createNonEnumerableProperty(IteratorPrototype, ITERATOR, returnThis);\n}\n\nmodule.exports = {\n  IteratorPrototype: IteratorPrototype,\n  BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS\n};\n","var fails = require('../internals/fails');\n\nmodule.exports = !fails(function () {\n  function F() { /* empty */ }\n  F.prototype.constructor = null;\n  // eslint-disable-next-line es/no-object-getprototypeof -- required for testing\n  return Object.getPrototypeOf(new F()) !== F.prototype;\n});\n","var has = require('../internals/has');\nvar toObject = require('../internals/to-object');\nvar sharedKey = require('../internals/shared-key');\nvar CORRECT_PROTOTYPE_GETTER = require('../internals/correct-prototype-getter');\n\nvar IE_PROTO = sharedKey('IE_PROTO');\nvar ObjectPrototype = Object.prototype;\n\n// `Object.getPrototypeOf` method\n// https://tc39.es/ecma262/#sec-object.getprototypeof\n// eslint-disable-next-line es/no-object-getprototypeof -- safe\nmodule.exports = CORRECT_PROTOTYPE_GETTER ? Object.getPrototypeOf : function (O) {\n  O = toObject(O);\n  if (has(O, IE_PROTO)) return O[IE_PROTO];\n  if (typeof O.constructor == 'function' && O instanceof O.constructor) {\n    return O.constructor.prototype;\n  } return O instanceof Object ? ObjectPrototype : null;\n};\n","var anObject = require('../internals/an-object');\nvar defineProperties = require('../internals/object-define-properties');\nvar enumBugKeys = require('../internals/enum-bug-keys');\nvar hiddenKeys = require('../internals/hidden-keys');\nvar html = require('../internals/html');\nvar documentCreateElement = require('../internals/document-create-element');\nvar sharedKey = require('../internals/shared-key');\n\nvar GT = '>';\nvar LT = '<';\nvar PROTOTYPE = 'prototype';\nvar SCRIPT = 'script';\nvar IE_PROTO = sharedKey('IE_PROTO');\n\nvar EmptyConstructor = function () { /* empty */ };\n\nvar scriptTag = function (content) {\n  return LT + SCRIPT + GT + content + LT + '/' + SCRIPT + GT;\n};\n\n// Create object with fake `null` prototype: use ActiveX Object with cleared prototype\nvar NullProtoObjectViaActiveX = function (activeXDocument) {\n  activeXDocument.write(scriptTag(''));\n  activeXDocument.close();\n  var temp = activeXDocument.parentWindow.Object;\n  activeXDocument = null; // avoid memory leak\n  return temp;\n};\n\n// Create object with fake `null` prototype: use iframe Object with cleared prototype\nvar NullProtoObjectViaIFrame = function () {\n  // Thrash, waste and sodomy: IE GC bug\n  var iframe = documentCreateElement('iframe');\n  var JS = 'java' + SCRIPT + ':';\n  var iframeDocument;\n  iframe.style.display = 'none';\n  html.appendChild(iframe);\n  // https://github.com/zloirock/core-js/issues/475\n  iframe.src = String(JS);\n  iframeDocument = iframe.contentWindow.document;\n  iframeDocument.open();\n  iframeDocument.write(scriptTag('document.F=Object'));\n  iframeDocument.close();\n  return iframeDocument.F;\n};\n\n// Check for document.domain and active x support\n// No need to use active x approach when document.domain is not set\n// see https://github.com/es-shims/es5-shim/issues/150\n// variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346\n// avoid IE GC bug\nvar activeXDocument;\nvar NullProtoObject = function () {\n  try {\n    /* global ActiveXObject -- old IE */\n    activeXDocument = document.domain && new ActiveXObject('htmlfile');\n  } catch (error) { /* ignore */ }\n  NullProtoObject = activeXDocument ? NullProtoObjectViaActiveX(activeXDocument) : NullProtoObjectViaIFrame();\n  var length = enumBugKeys.length;\n  while (length--) delete NullProtoObject[PROTOTYPE][enumBugKeys[length]];\n  return NullProtoObject();\n};\n\nhiddenKeys[IE_PROTO] = true;\n\n// `Object.create` method\n// https://tc39.es/ecma262/#sec-object.create\nmodule.exports = Object.create || function create(O, Properties) {\n  var result;\n  if (O !== null) {\n    EmptyConstructor[PROTOTYPE] = anObject(O);\n    result = new EmptyConstructor();\n    EmptyConstructor[PROTOTYPE] = null;\n    // add \"__proto__\" for Object.getPrototypeOf polyfill\n    result[IE_PROTO] = O;\n  } else result = NullProtoObject();\n  return Properties === undefined ? result : defineProperties(result, Properties);\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar definePropertyModule = require('../internals/object-define-property');\nvar anObject = require('../internals/an-object');\nvar objectKeys = require('../internals/object-keys');\n\n// `Object.defineProperties` method\n// https://tc39.es/ecma262/#sec-object.defineproperties\n// eslint-disable-next-line es/no-object-defineproperties -- safe\nmodule.exports = DESCRIPTORS ? Object.defineProperties : function defineProperties(O, Properties) {\n  anObject(O);\n  var keys = objectKeys(Properties);\n  var length = keys.length;\n  var index = 0;\n  var key;\n  while (length > index) definePropertyModule.f(O, key = keys[index++], Properties[key]);\n  return O;\n};\n","'use strict';\nvar IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;\nvar create = require('../internals/object-create');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar Iterators = require('../internals/iterators');\n\nvar returnThis = function () { return this; };\n\nmodule.exports = function (IteratorConstructor, NAME, next) {\n  var TO_STRING_TAG = NAME + ' Iterator';\n  IteratorConstructor.prototype = create(IteratorPrototype, { next: createPropertyDescriptor(1, next) });\n  setToStringTag(IteratorConstructor, TO_STRING_TAG, false, true);\n  Iterators[TO_STRING_TAG] = returnThis;\n  return IteratorConstructor;\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar createIteratorConstructor = require('../internals/create-iterator-constructor');\nvar getPrototypeOf = require('../internals/object-get-prototype-of');\nvar setPrototypeOf = require('../internals/object-set-prototype-of');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_PURE = require('../internals/is-pure');\nvar Iterators = require('../internals/iterators');\nvar IteratorsCore = require('../internals/iterators-core');\n\nvar IteratorPrototype = IteratorsCore.IteratorPrototype;\nvar BUGGY_SAFARI_ITERATORS = IteratorsCore.BUGGY_SAFARI_ITERATORS;\nvar ITERATOR = wellKnownSymbol('iterator');\nvar KEYS = 'keys';\nvar VALUES = 'values';\nvar ENTRIES = 'entries';\n\nvar returnThis = function () { return this; };\n\nmodule.exports = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {\n  createIteratorConstructor(IteratorConstructor, NAME, next);\n\n  var getIterationMethod = function (KIND) {\n    if (KIND === DEFAULT && defaultIterator) return defaultIterator;\n    if (!BUGGY_SAFARI_ITERATORS && KIND in IterablePrototype) return IterablePrototype[KIND];\n    switch (KIND) {\n      case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };\n      case VALUES: return function values() { return new IteratorConstructor(this, KIND); };\n      case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };\n    } return function () { return new IteratorConstructor(this); };\n  };\n\n  var TO_STRING_TAG = NAME + ' Iterator';\n  var INCORRECT_VALUES_NAME = false;\n  var IterablePrototype = Iterable.prototype;\n  var nativeIterator = IterablePrototype[ITERATOR]\n    || IterablePrototype['@@iterator']\n    || DEFAULT && IterablePrototype[DEFAULT];\n  var defaultIterator = !BUGGY_SAFARI_ITERATORS && nativeIterator || getIterationMethod(DEFAULT);\n  var anyNativeIterator = NAME == 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;\n  var CurrentIteratorPrototype, methods, KEY;\n\n  // fix native\n  if (anyNativeIterator) {\n    CurrentIteratorPrototype = getPrototypeOf(anyNativeIterator.call(new Iterable()));\n    if (IteratorPrototype !== Object.prototype && CurrentIteratorPrototype.next) {\n      if (!IS_PURE && getPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype) {\n        if (setPrototypeOf) {\n          setPrototypeOf(CurrentIteratorPrototype, IteratorPrototype);\n        } else if (typeof CurrentIteratorPrototype[ITERATOR] != 'function') {\n          createNonEnumerableProperty(CurrentIteratorPrototype, ITERATOR, returnThis);\n        }\n      }\n      // Set @@toStringTag to native iterators\n      setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true, true);\n      if (IS_PURE) Iterators[TO_STRING_TAG] = returnThis;\n    }\n  }\n\n  // fix Array#{values, @@iterator}.name in V8 / FF\n  if (DEFAULT == VALUES && nativeIterator && nativeIterator.name !== VALUES) {\n    INCORRECT_VALUES_NAME = true;\n    defaultIterator = function values() { return nativeIterator.call(this); };\n  }\n\n  // define iterator\n  if ((!IS_PURE || FORCED) && IterablePrototype[ITERATOR] !== defaultIterator) {\n    createNonEnumerableProperty(IterablePrototype, ITERATOR, defaultIterator);\n  }\n  Iterators[NAME] = defaultIterator;\n\n  // export additional methods\n  if (DEFAULT) {\n    methods = {\n      values: getIterationMethod(VALUES),\n      keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),\n      entries: getIterationMethod(ENTRIES)\n    };\n    if (FORCED) for (KEY in methods) {\n      if (BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {\n        redefine(IterablePrototype, KEY, methods[KEY]);\n      }\n    } else $({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME }, methods);\n  }\n\n  return methods;\n};\n","'use strict';\nvar charAt = require('../internals/string-multibyte').charAt;\nvar InternalStateModule = require('../internals/internal-state');\nvar defineIterator = require('../internals/define-iterator');\n\nvar STRING_ITERATOR = 'String Iterator';\nvar setInternalState = InternalStateModule.set;\nvar getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);\n\n// `String.prototype[@@iterator]` method\n// https://tc39.es/ecma262/#sec-string.prototype-@@iterator\ndefineIterator(String, 'String', function (iterated) {\n  setInternalState(this, {\n    type: STRING_ITERATOR,\n    string: String(iterated),\n    index: 0\n  });\n// `%StringIteratorPrototype%.next` method\n// https://tc39.es/ecma262/#sec-%stringiteratorprototype%.next\n}, function next() {\n  var state = getInternalState(this);\n  var string = state.string;\n  var index = state.index;\n  var point;\n  if (index >= string.length) return { value: undefined, done: true };\n  point = charAt(string, index);\n  state.index += point.length;\n  return { value: point, done: false };\n});\n","// a string of all valid unicode whitespaces\nmodule.exports = '\\u0009\\u000A\\u000B\\u000C\\u000D\\u0020\\u00A0\\u1680\\u2000\\u2001\\u2002' +\n  '\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200A\\u202F\\u205F\\u3000\\u2028\\u2029\\uFEFF';\n","var requireObjectCoercible = require('../internals/require-object-coercible');\nvar whitespaces = require('../internals/whitespaces');\n\nvar whitespace = '[' + whitespaces + ']';\nvar ltrim = RegExp('^' + whitespace + whitespace + '*');\nvar rtrim = RegExp(whitespace + whitespace + '*$');\n\n// `String.prototype.{ trim, trimStart, trimEnd, trimLeft, trimRight }` methods implementation\nvar createMethod = function (TYPE) {\n  return function ($this) {\n    var string = String(requireObjectCoercible($this));\n    if (TYPE & 1) string = string.replace(ltrim, '');\n    if (TYPE & 2) string = string.replace(rtrim, '');\n    return string;\n  };\n};\n\nmodule.exports = {\n  // `String.prototype.{ trimLeft, trimStart }` methods\n  // https://tc39.es/ecma262/#sec-string.prototype.trimstart\n  start: createMethod(1),\n  // `String.prototype.{ trimRight, trimEnd }` methods\n  // https://tc39.es/ecma262/#sec-string.prototype.trimend\n  end: createMethod(2),\n  // `String.prototype.trim` method\n  // https://tc39.es/ecma262/#sec-string.prototype.trim\n  trim: createMethod(3)\n};\n","var fails = require('../internals/fails');\nvar whitespaces = require('../internals/whitespaces');\n\nvar non = '\\u200B\\u0085\\u180E';\n\n// check that a method works with the correct list\n// of whitespaces and has a correct name\nmodule.exports = function (METHOD_NAME) {\n  return fails(function () {\n    return !!whitespaces[METHOD_NAME]() || non[METHOD_NAME]() != non || whitespaces[METHOD_NAME].name !== METHOD_NAME;\n  });\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar $trim = require('../internals/string-trim').trim;\nvar forcedStringTrimMethod = require('../internals/string-trim-forced');\n\n// `String.prototype.trim` method\n// https://tc39.es/ecma262/#sec-string.prototype.trim\n$({ target: 'String', proto: true, forced: forcedStringTrimMethod('trim') }, {\n  trim: function trim() {\n    return $trim(this);\n  }\n});\n","/* eslint-disable es/no-object-getownpropertynames -- safe */\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar $getOwnPropertyNames = require('../internals/object-get-own-property-names').f;\n\nvar toString = {}.toString;\n\nvar windowNames = typeof window == 'object' && window && Object.getOwnPropertyNames\n  ? Object.getOwnPropertyNames(window) : [];\n\nvar getWindowNames = function (it) {\n  try {\n    return $getOwnPropertyNames(it);\n  } catch (error) {\n    return windowNames.slice();\n  }\n};\n\n// fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window\nmodule.exports.f = function getOwnPropertyNames(it) {\n  return windowNames && toString.call(it) == '[object Window]'\n    ? getWindowNames(it)\n    : $getOwnPropertyNames(toIndexedObject(it));\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nexports.f = wellKnownSymbol;\n","var path = require('../internals/path');\nvar has = require('../internals/has');\nvar wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');\nvar defineProperty = require('../internals/object-define-property').f;\n\nmodule.exports = function (NAME) {\n  var Symbol = path.Symbol || (path.Symbol = {});\n  if (!has(Symbol, NAME)) defineProperty(Symbol, NAME, {\n    value: wrappedWellKnownSymbolModule.f(NAME)\n  });\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar global = require('../internals/global');\nvar getBuiltIn = require('../internals/get-built-in');\nvar IS_PURE = require('../internals/is-pure');\nvar DESCRIPTORS = require('../internals/descriptors');\nvar NATIVE_SYMBOL = require('../internals/native-symbol');\nvar USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');\nvar fails = require('../internals/fails');\nvar has = require('../internals/has');\nvar isArray = require('../internals/is-array');\nvar isObject = require('../internals/is-object');\nvar anObject = require('../internals/an-object');\nvar toObject = require('../internals/to-object');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar toPrimitive = require('../internals/to-primitive');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar nativeObjectCreate = require('../internals/object-create');\nvar objectKeys = require('../internals/object-keys');\nvar getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');\nvar getOwnPropertyNamesExternal = require('../internals/object-get-own-property-names-external');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');\nvar definePropertyModule = require('../internals/object-define-property');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar shared = require('../internals/shared');\nvar sharedKey = require('../internals/shared-key');\nvar hiddenKeys = require('../internals/hidden-keys');\nvar uid = require('../internals/uid');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');\nvar defineWellKnownSymbol = require('../internals/define-well-known-symbol');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar InternalStateModule = require('../internals/internal-state');\nvar $forEach = require('../internals/array-iteration').forEach;\n\nvar HIDDEN = sharedKey('hidden');\nvar SYMBOL = 'Symbol';\nvar PROTOTYPE = 'prototype';\nvar TO_PRIMITIVE = wellKnownSymbol('toPrimitive');\nvar setInternalState = InternalStateModule.set;\nvar getInternalState = InternalStateModule.getterFor(SYMBOL);\nvar ObjectPrototype = Object[PROTOTYPE];\nvar $Symbol = global.Symbol;\nvar $stringify = getBuiltIn('JSON', 'stringify');\nvar nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;\nvar nativeDefineProperty = definePropertyModule.f;\nvar nativeGetOwnPropertyNames = getOwnPropertyNamesExternal.f;\nvar nativePropertyIsEnumerable = propertyIsEnumerableModule.f;\nvar AllSymbols = shared('symbols');\nvar ObjectPrototypeSymbols = shared('op-symbols');\nvar StringToSymbolRegistry = shared('string-to-symbol-registry');\nvar SymbolToStringRegistry = shared('symbol-to-string-registry');\nvar WellKnownSymbolsStore = shared('wks');\nvar QObject = global.QObject;\n// Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173\nvar USE_SETTER = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;\n\n// fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687\nvar setSymbolDescriptor = DESCRIPTORS && fails(function () {\n  return nativeObjectCreate(nativeDefineProperty({}, 'a', {\n    get: function () { return nativeDefineProperty(this, 'a', { value: 7 }).a; }\n  })).a != 7;\n}) ? function (O, P, Attributes) {\n  var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor(ObjectPrototype, P);\n  if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];\n  nativeDefineProperty(O, P, Attributes);\n  if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {\n    nativeDefineProperty(ObjectPrototype, P, ObjectPrototypeDescriptor);\n  }\n} : nativeDefineProperty;\n\nvar wrap = function (tag, description) {\n  var symbol = AllSymbols[tag] = nativeObjectCreate($Symbol[PROTOTYPE]);\n  setInternalState(symbol, {\n    type: SYMBOL,\n    tag: tag,\n    description: description\n  });\n  if (!DESCRIPTORS) symbol.description = description;\n  return symbol;\n};\n\nvar isSymbol = USE_SYMBOL_AS_UID ? function (it) {\n  return typeof it == 'symbol';\n} : function (it) {\n  return Object(it) instanceof $Symbol;\n};\n\nvar $defineProperty = function defineProperty(O, P, Attributes) {\n  if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);\n  anObject(O);\n  var key = toPrimitive(P, true);\n  anObject(Attributes);\n  if (has(AllSymbols, key)) {\n    if (!Attributes.enumerable) {\n      if (!has(O, HIDDEN)) nativeDefineProperty(O, HIDDEN, createPropertyDescriptor(1, {}));\n      O[HIDDEN][key] = true;\n    } else {\n      if (has(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;\n      Attributes = nativeObjectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });\n    } return setSymbolDescriptor(O, key, Attributes);\n  } return nativeDefineProperty(O, key, Attributes);\n};\n\nvar $defineProperties = function defineProperties(O, Properties) {\n  anObject(O);\n  var properties = toIndexedObject(Properties);\n  var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));\n  $forEach(keys, function (key) {\n    if (!DESCRIPTORS || $propertyIsEnumerable.call(properties, key)) $defineProperty(O, key, properties[key]);\n  });\n  return O;\n};\n\nvar $create = function create(O, Properties) {\n  return Properties === undefined ? nativeObjectCreate(O) : $defineProperties(nativeObjectCreate(O), Properties);\n};\n\nvar $propertyIsEnumerable = function propertyIsEnumerable(V) {\n  var P = toPrimitive(V, true);\n  var enumerable = nativePropertyIsEnumerable.call(this, P);\n  if (this === ObjectPrototype && has(AllSymbols, P) && !has(ObjectPrototypeSymbols, P)) return false;\n  return enumerable || !has(this, P) || !has(AllSymbols, P) || has(this, HIDDEN) && this[HIDDEN][P] ? enumerable : true;\n};\n\nvar $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {\n  var it = toIndexedObject(O);\n  var key = toPrimitive(P, true);\n  if (it === ObjectPrototype && has(AllSymbols, key) && !has(ObjectPrototypeSymbols, key)) return;\n  var descriptor = nativeGetOwnPropertyDescriptor(it, key);\n  if (descriptor && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) {\n    descriptor.enumerable = true;\n  }\n  return descriptor;\n};\n\nvar $getOwnPropertyNames = function getOwnPropertyNames(O) {\n  var names = nativeGetOwnPropertyNames(toIndexedObject(O));\n  var result = [];\n  $forEach(names, function (key) {\n    if (!has(AllSymbols, key) && !has(hiddenKeys, key)) result.push(key);\n  });\n  return result;\n};\n\nvar $getOwnPropertySymbols = function getOwnPropertySymbols(O) {\n  var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;\n  var names = nativeGetOwnPropertyNames(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));\n  var result = [];\n  $forEach(names, function (key) {\n    if (has(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || has(ObjectPrototype, key))) {\n      result.push(AllSymbols[key]);\n    }\n  });\n  return result;\n};\n\n// `Symbol` constructor\n// https://tc39.es/ecma262/#sec-symbol-constructor\nif (!NATIVE_SYMBOL) {\n  $Symbol = function Symbol() {\n    if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor');\n    var description = !arguments.length || arguments[0] === undefined ? undefined : String(arguments[0]);\n    var tag = uid(description);\n    var setter = function (value) {\n      if (this === ObjectPrototype) setter.call(ObjectPrototypeSymbols, value);\n      if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;\n      setSymbolDescriptor(this, tag, createPropertyDescriptor(1, value));\n    };\n    if (DESCRIPTORS && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });\n    return wrap(tag, description);\n  };\n\n  redefine($Symbol[PROTOTYPE], 'toString', function toString() {\n    return getInternalState(this).tag;\n  });\n\n  redefine($Symbol, 'withoutSetter', function (description) {\n    return wrap(uid(description), description);\n  });\n\n  propertyIsEnumerableModule.f = $propertyIsEnumerable;\n  definePropertyModule.f = $defineProperty;\n  getOwnPropertyDescriptorModule.f = $getOwnPropertyDescriptor;\n  getOwnPropertyNamesModule.f = getOwnPropertyNamesExternal.f = $getOwnPropertyNames;\n  getOwnPropertySymbolsModule.f = $getOwnPropertySymbols;\n\n  wrappedWellKnownSymbolModule.f = function (name) {\n    return wrap(wellKnownSymbol(name), name);\n  };\n\n  if (DESCRIPTORS) {\n    // https://github.com/tc39/proposal-Symbol-description\n    nativeDefineProperty($Symbol[PROTOTYPE], 'description', {\n      configurable: true,\n      get: function description() {\n        return getInternalState(this).description;\n      }\n    });\n    if (!IS_PURE) {\n      redefine(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });\n    }\n  }\n}\n\n$({ global: true, wrap: true, forced: !NATIVE_SYMBOL, sham: !NATIVE_SYMBOL }, {\n  Symbol: $Symbol\n});\n\n$forEach(objectKeys(WellKnownSymbolsStore), function (name) {\n  defineWellKnownSymbol(name);\n});\n\n$({ target: SYMBOL, stat: true, forced: !NATIVE_SYMBOL }, {\n  // `Symbol.for` method\n  // https://tc39.es/ecma262/#sec-symbol.for\n  'for': function (key) {\n    var string = String(key);\n    if (has(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];\n    var symbol = $Symbol(string);\n    StringToSymbolRegistry[string] = symbol;\n    SymbolToStringRegistry[symbol] = string;\n    return symbol;\n  },\n  // `Symbol.keyFor` method\n  // https://tc39.es/ecma262/#sec-symbol.keyfor\n  keyFor: function keyFor(sym) {\n    if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol');\n    if (has(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];\n  },\n  useSetter: function () { USE_SETTER = true; },\n  useSimple: function () { USE_SETTER = false; }\n});\n\n$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL, sham: !DESCRIPTORS }, {\n  // `Object.create` method\n  // https://tc39.es/ecma262/#sec-object.create\n  create: $create,\n  // `Object.defineProperty` method\n  // https://tc39.es/ecma262/#sec-object.defineproperty\n  defineProperty: $defineProperty,\n  // `Object.defineProperties` method\n  // https://tc39.es/ecma262/#sec-object.defineproperties\n  defineProperties: $defineProperties,\n  // `Object.getOwnPropertyDescriptor` method\n  // https://tc39.es/ecma262/#sec-object.getownpropertydescriptors\n  getOwnPropertyDescriptor: $getOwnPropertyDescriptor\n});\n\n$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL }, {\n  // `Object.getOwnPropertyNames` method\n  // https://tc39.es/ecma262/#sec-object.getownpropertynames\n  getOwnPropertyNames: $getOwnPropertyNames,\n  // `Object.getOwnPropertySymbols` method\n  // https://tc39.es/ecma262/#sec-object.getownpropertysymbols\n  getOwnPropertySymbols: $getOwnPropertySymbols\n});\n\n// Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives\n// https://bugs.chromium.org/p/v8/issues/detail?id=3443\n$({ target: 'Object', stat: true, forced: fails(function () { getOwnPropertySymbolsModule.f(1); }) }, {\n  getOwnPropertySymbols: function getOwnPropertySymbols(it) {\n    return getOwnPropertySymbolsModule.f(toObject(it));\n  }\n});\n\n// `JSON.stringify` method behavior with symbols\n// https://tc39.es/ecma262/#sec-json.stringify\nif ($stringify) {\n  var FORCED_JSON_STRINGIFY = !NATIVE_SYMBOL || fails(function () {\n    var symbol = $Symbol();\n    // MS Edge converts symbol values to JSON as {}\n    return $stringify([symbol]) != '[null]'\n      // WebKit converts symbol values to JSON as null\n      || $stringify({ a: symbol }) != '{}'\n      // V8 throws on boxed symbols\n      || $stringify(Object(symbol)) != '{}';\n  });\n\n  $({ target: 'JSON', stat: true, forced: FORCED_JSON_STRINGIFY }, {\n    // eslint-disable-next-line no-unused-vars -- required for `.length`\n    stringify: function stringify(it, replacer, space) {\n      var args = [it];\n      var index = 1;\n      var $replacer;\n      while (arguments.length > index) args.push(arguments[index++]);\n      $replacer = replacer;\n      if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined\n      if (!isArray(replacer)) replacer = function (key, value) {\n        if (typeof $replacer == 'function') value = $replacer.call(this, key, value);\n        if (!isSymbol(value)) return value;\n      };\n      args[1] = replacer;\n      return $stringify.apply(null, args);\n    }\n  });\n}\n\n// `Symbol.prototype[@@toPrimitive]` method\n// https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive\nif (!$Symbol[PROTOTYPE][TO_PRIMITIVE]) {\n  createNonEnumerableProperty($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf);\n}\n// `Symbol.prototype[@@toStringTag]` property\n// https://tc39.es/ecma262/#sec-symbol.prototype-@@tostringtag\nsetToStringTag($Symbol, SYMBOL);\n\nhiddenKeys[HIDDEN] = true;\n","// `Symbol.prototype.description` getter\n// https://tc39.es/ecma262/#sec-symbol.prototype.description\n'use strict';\nvar $ = require('../internals/export');\nvar DESCRIPTORS = require('../internals/descriptors');\nvar global = require('../internals/global');\nvar has = require('../internals/has');\nvar isObject = require('../internals/is-object');\nvar defineProperty = require('../internals/object-define-property').f;\nvar copyConstructorProperties = require('../internals/copy-constructor-properties');\n\nvar NativeSymbol = global.Symbol;\n\nif (DESCRIPTORS && typeof NativeSymbol == 'function' && (!('description' in NativeSymbol.prototype) ||\n  // Safari 12 bug\n  NativeSymbol().description !== undefined\n)) {\n  var EmptyStringDescriptionStore = {};\n  // wrap Symbol constructor for correct work with undefined description\n  var SymbolWrapper = function Symbol() {\n    var description = arguments.length < 1 || arguments[0] === undefined ? undefined : String(arguments[0]);\n    var result = this instanceof SymbolWrapper\n      ? new NativeSymbol(description)\n      // in Edge 13, String(Symbol(undefined)) === 'Symbol(undefined)'\n      : description === undefined ? NativeSymbol() : NativeSymbol(description);\n    if (description === '') EmptyStringDescriptionStore[result] = true;\n    return result;\n  };\n  copyConstructorProperties(SymbolWrapper, NativeSymbol);\n  var symbolPrototype = SymbolWrapper.prototype = NativeSymbol.prototype;\n  symbolPrototype.constructor = SymbolWrapper;\n\n  var symbolToString = symbolPrototype.toString;\n  var native = String(NativeSymbol('test')) == 'Symbol(test)';\n  var regexp = /^Symbol\\((.*)\\)[^)]+$/;\n  defineProperty(symbolPrototype, 'description', {\n    configurable: true,\n    get: function description() {\n      var symbol = isObject(this) ? this.valueOf() : this;\n      var string = symbolToString.call(symbol);\n      if (has(EmptyStringDescriptionStore, symbol)) return '';\n      var desc = native ? string.slice(7, -1) : string.replace(regexp, '$1');\n      return desc === '' ? undefined : desc;\n    }\n  });\n\n  $({ global: true, forced: true }, {\n    Symbol: SymbolWrapper\n  });\n}\n","'use strict';\nvar anObject = require('../internals/an-object');\n\n// `RegExp.prototype.flags` getter implementation\n// https://tc39.es/ecma262/#sec-get-regexp.prototype.flags\nmodule.exports = function () {\n  var that = anObject(this);\n  var result = '';\n  if (that.global) result += 'g';\n  if (that.ignoreCase) result += 'i';\n  if (that.multiline) result += 'm';\n  if (that.dotAll) result += 's';\n  if (that.unicode) result += 'u';\n  if (that.sticky) result += 'y';\n  return result;\n};\n","'use strict';\n\nvar fails = require('./fails');\n\n// babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError,\n// so we use an intermediate function.\nfunction RE(s, f) {\n  return RegExp(s, f);\n}\n\nexports.UNSUPPORTED_Y = fails(function () {\n  // babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError\n  var re = RE('a', 'y');\n  re.lastIndex = 2;\n  return re.exec('abcd') != null;\n});\n\nexports.BROKEN_CARET = fails(function () {\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=773687\n  var re = RE('^r', 'gy');\n  re.lastIndex = 2;\n  return re.exec('str') != null;\n});\n","'use strict';\n/* eslint-disable regexp/no-assertion-capturing-group, regexp/no-empty-group, regexp/no-lazy-ends -- testing */\n/* eslint-disable regexp/no-useless-quantifier -- testing */\nvar regexpFlags = require('./regexp-flags');\nvar stickyHelpers = require('./regexp-sticky-helpers');\nvar shared = require('./shared');\n\nvar nativeExec = RegExp.prototype.exec;\nvar nativeReplace = shared('native-string-replace', String.prototype.replace);\n\nvar patchedExec = nativeExec;\n\nvar UPDATES_LAST_INDEX_WRONG = (function () {\n  var re1 = /a/;\n  var re2 = /b*/g;\n  nativeExec.call(re1, 'a');\n  nativeExec.call(re2, 'a');\n  return re1.lastIndex !== 0 || re2.lastIndex !== 0;\n})();\n\nvar UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y || stickyHelpers.BROKEN_CARET;\n\n// nonparticipating capturing group, copied from es5-shim's String#split patch.\nvar NPCG_INCLUDED = /()??/.exec('')[1] !== undefined;\n\nvar PATCH = UPDATES_LAST_INDEX_WRONG || NPCG_INCLUDED || UNSUPPORTED_Y;\n\nif (PATCH) {\n  patchedExec = function exec(str) {\n    var re = this;\n    var lastIndex, reCopy, match, i;\n    var sticky = UNSUPPORTED_Y && re.sticky;\n    var flags = regexpFlags.call(re);\n    var source = re.source;\n    var charsAdded = 0;\n    var strCopy = str;\n\n    if (sticky) {\n      flags = flags.replace('y', '');\n      if (flags.indexOf('g') === -1) {\n        flags += 'g';\n      }\n\n      strCopy = String(str).slice(re.lastIndex);\n      // Support anchored sticky behavior.\n      if (re.lastIndex > 0 && (!re.multiline || re.multiline && str[re.lastIndex - 1] !== '\\n')) {\n        source = '(?: ' + source + ')';\n        strCopy = ' ' + strCopy;\n        charsAdded++;\n      }\n      // ^(? + rx + ) is needed, in combination with some str slicing, to\n      // simulate the 'y' flag.\n      reCopy = new RegExp('^(?:' + source + ')', flags);\n    }\n\n    if (NPCG_INCLUDED) {\n      reCopy = new RegExp('^' + source + '$(?!\\\\s)', flags);\n    }\n    if (UPDATES_LAST_INDEX_WRONG) lastIndex = re.lastIndex;\n\n    match = nativeExec.call(sticky ? reCopy : re, strCopy);\n\n    if (sticky) {\n      if (match) {\n        match.input = match.input.slice(charsAdded);\n        match[0] = match[0].slice(charsAdded);\n        match.index = re.lastIndex;\n        re.lastIndex += match[0].length;\n      } else re.lastIndex = 0;\n    } else if (UPDATES_LAST_INDEX_WRONG && match) {\n      re.lastIndex = re.global ? match.index + match[0].length : lastIndex;\n    }\n    if (NPCG_INCLUDED && match && match.length > 1) {\n      // Fix browsers whose `exec` methods don't consistently return `undefined`\n      // for NPCG, like IE8. NOTE: This doesn' work for /(.?)?/\n      nativeReplace.call(match[0], reCopy, function () {\n        for (i = 1; i < arguments.length - 2; i++) {\n          if (arguments[i] === undefined) match[i] = undefined;\n        }\n      });\n    }\n\n    return match;\n  };\n}\n\nmodule.exports = patchedExec;\n","'use strict';\nvar $ = require('../internals/export');\nvar exec = require('../internals/regexp-exec');\n\n// `RegExp.prototype.exec` method\n// https://tc39.es/ecma262/#sec-regexp.prototype.exec\n$({ target: 'RegExp', proto: true, forced: /./.exec !== exec }, {\n  exec: exec\n});\n","'use strict';\n// TODO: Remove from `core-js@4` since it's moved to entry points\nrequire('../modules/es.regexp.exec');\nvar redefine = require('../internals/redefine');\nvar regexpExec = require('../internals/regexp-exec');\nvar fails = require('../internals/fails');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nvar SPECIES = wellKnownSymbol('species');\nvar RegExpPrototype = RegExp.prototype;\n\nvar REPLACE_SUPPORTS_NAMED_GROUPS = !fails(function () {\n  // #replace needs built-in support for named groups.\n  // #match works fine because it just return the exec results, even if it has\n  // a \"grops\" property.\n  var re = /./;\n  re.exec = function () {\n    var result = [];\n    result.groups = { a: '7' };\n    return result;\n  };\n  return ''.replace(re, '$<a>') !== '7';\n});\n\n// IE <= 11 replaces $0 with the whole match, as if it was $&\n// https://stackoverflow.com/questions/6024666/getting-ie-to-replace-a-regex-with-the-literal-string-0\nvar REPLACE_KEEPS_$0 = (function () {\n  // eslint-disable-next-line regexp/prefer-escape-replacement-dollar-char -- required for testing\n  return 'a'.replace(/./, '$0') === '$0';\n})();\n\nvar REPLACE = wellKnownSymbol('replace');\n// Safari <= 13.0.3(?) substitutes nth capture where n>m with an empty string\nvar REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = (function () {\n  if (/./[REPLACE]) {\n    return /./[REPLACE]('a', '$0') === '';\n  }\n  return false;\n})();\n\n// Chrome 51 has a buggy \"split\" implementation when RegExp#exec !== nativeExec\n// Weex JS has frozen built-in prototypes, so use try / catch wrapper\nvar SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {\n  // eslint-disable-next-line regexp/no-empty-group -- required for testing\n  var re = /(?:)/;\n  var originalExec = re.exec;\n  re.exec = function () { return originalExec.apply(this, arguments); };\n  var result = 'ab'.split(re);\n  return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';\n});\n\nmodule.exports = function (KEY, length, exec, sham) {\n  var SYMBOL = wellKnownSymbol(KEY);\n\n  var DELEGATES_TO_SYMBOL = !fails(function () {\n    // String methods call symbol-named RegEp methods\n    var O = {};\n    O[SYMBOL] = function () { return 7; };\n    return ''[KEY](O) != 7;\n  });\n\n  var DELEGATES_TO_EXEC = DELEGATES_TO_SYMBOL && !fails(function () {\n    // Symbol-named RegExp methods call .exec\n    var execCalled = false;\n    var re = /a/;\n\n    if (KEY === 'split') {\n      // We can't use real regex here since it causes deoptimization\n      // and serious performance degradation in V8\n      // https://github.com/zloirock/core-js/issues/306\n      re = {};\n      // RegExp[@@split] doesn't call the regex's exec method, but first creates\n      // a new one. We need to return the patched regex when creating the new one.\n      re.constructor = {};\n      re.constructor[SPECIES] = function () { return re; };\n      re.flags = '';\n      re[SYMBOL] = /./[SYMBOL];\n    }\n\n    re.exec = function () { execCalled = true; return null; };\n\n    re[SYMBOL]('');\n    return !execCalled;\n  });\n\n  if (\n    !DELEGATES_TO_SYMBOL ||\n    !DELEGATES_TO_EXEC ||\n    (KEY === 'replace' && !(\n      REPLACE_SUPPORTS_NAMED_GROUPS &&\n      REPLACE_KEEPS_$0 &&\n      !REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE\n    )) ||\n    (KEY === 'split' && !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC)\n  ) {\n    var nativeRegExpMethod = /./[SYMBOL];\n    var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {\n      var $exec = regexp.exec;\n      if ($exec === regexpExec || $exec === RegExpPrototype.exec) {\n        if (DELEGATES_TO_SYMBOL && !forceStringMethod) {\n          // The native String method already delegates to @@method (this\n          // polyfilled function), leasing to infinite recursion.\n          // We avoid it by directly calling the native @@method method.\n          return { done: true, value: nativeRegExpMethod.call(regexp, str, arg2) };\n        }\n        return { done: true, value: nativeMethod.call(str, regexp, arg2) };\n      }\n      return { done: false };\n    }, {\n      REPLACE_KEEPS_$0: REPLACE_KEEPS_$0,\n      REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE: REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE\n    });\n    var stringMethod = methods[0];\n    var regexMethod = methods[1];\n\n    redefine(String.prototype, KEY, stringMethod);\n    redefine(RegExpPrototype, SYMBOL, length == 2\n      // 21.2.5.8 RegExp.prototype[@@replace](string, replaceValue)\n      // 21.2.5.11 RegExp.prototype[@@split](string, limit)\n      ? function (string, arg) { return regexMethod.call(string, this, arg); }\n      // 21.2.5.6 RegExp.prototype[@@match](string)\n      // 21.2.5.9 RegExp.prototype[@@search](string)\n      : function (string) { return regexMethod.call(string, this); }\n    );\n  }\n\n  if (sham) createNonEnumerableProperty(RegExpPrototype[SYMBOL], 'sham', true);\n};\n","'use strict';\nvar charAt = require('../internals/string-multibyte').charAt;\n\n// `AdvanceStringIndex` abstract operation\n// https://tc39.es/ecma262/#sec-advancestringindex\nmodule.exports = function (S, index, unicode) {\n  return index + (unicode ? charAt(S, index).length : 1);\n};\n","var classof = require('./classof-raw');\nvar regexpExec = require('./regexp-exec');\n\n// `RegExpExec` abstract operation\n// https://tc39.es/ecma262/#sec-regexpexec\nmodule.exports = function (R, S) {\n  var exec = R.exec;\n  if (typeof exec === 'function') {\n    var result = exec.call(R, S);\n    if (typeof result !== 'object') {\n      throw TypeError('RegExp exec method returned something other than an Object or null');\n    }\n    return result;\n  }\n\n  if (classof(R) !== 'RegExp') {\n    throw TypeError('RegExp#exec called on incompatible receiver');\n  }\n\n  return regexpExec.call(R, S);\n};\n\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar anObject = require('../internals/an-object');\nvar toLength = require('../internals/to-length');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar advanceStringIndex = require('../internals/advance-string-index');\nvar regExpExec = require('../internals/regexp-exec-abstract');\n\n// @@match logic\nfixRegExpWellKnownSymbolLogic('match', 1, function (MATCH, nativeMatch, maybeCallNative) {\n  return [\n    // `String.prototype.match` method\n    // https://tc39.es/ecma262/#sec-string.prototype.match\n    function match(regexp) {\n      var O = requireObjectCoercible(this);\n      var matcher = regexp == undefined ? undefined : regexp[MATCH];\n      return matcher !== undefined ? matcher.call(regexp, O) : new RegExp(regexp)[MATCH](String(O));\n    },\n    // `RegExp.prototype[@@match]` method\n    // https://tc39.es/ecma262/#sec-regexp.prototype-@@match\n    function (regexp) {\n      var res = maybeCallNative(nativeMatch, regexp, this);\n      if (res.done) return res.value;\n\n      var rx = anObject(regexp);\n      var S = String(this);\n\n      if (!rx.global) return regExpExec(rx, S);\n\n      var fullUnicode = rx.unicode;\n      rx.lastIndex = 0;\n      var A = [];\n      var n = 0;\n      var result;\n      while ((result = regExpExec(rx, S)) !== null) {\n        var matchStr = String(result[0]);\n        A[n] = matchStr;\n        if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);\n        n++;\n      }\n      return n === 0 ? null : A;\n    }\n  ];\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\nvar toInteger = require('../internals/to-integer');\nvar toLength = require('../internals/to-length');\nvar toObject = require('../internals/to-object');\nvar arraySpeciesCreate = require('../internals/array-species-create');\nvar createProperty = require('../internals/create-property');\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('splice');\n\nvar max = Math.max;\nvar min = Math.min;\nvar MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;\nvar MAXIMUM_ALLOWED_LENGTH_EXCEEDED = 'Maximum allowed length exceeded';\n\n// `Array.prototype.splice` method\n// https://tc39.es/ecma262/#sec-array.prototype.splice\n// with adding support of @@species\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {\n  splice: function splice(start, deleteCount /* , ...items */) {\n    var O = toObject(this);\n    var len = toLength(O.length);\n    var actualStart = toAbsoluteIndex(start, len);\n    var argumentsLength = arguments.length;\n    var insertCount, actualDeleteCount, A, k, from, to;\n    if (argumentsLength === 0) {\n      insertCount = actualDeleteCount = 0;\n    } else if (argumentsLength === 1) {\n      insertCount = 0;\n      actualDeleteCount = len - actualStart;\n    } else {\n      insertCount = argumentsLength - 2;\n      actualDeleteCount = min(max(toInteger(deleteCount), 0), len - actualStart);\n    }\n    if (len + insertCount - actualDeleteCount > MAX_SAFE_INTEGER) {\n      throw TypeError(MAXIMUM_ALLOWED_LENGTH_EXCEEDED);\n    }\n    A = arraySpeciesCreate(O, actualDeleteCount);\n    for (k = 0; k < actualDeleteCount; k++) {\n      from = actualStart + k;\n      if (from in O) createProperty(A, k, O[from]);\n    }\n    A.length = actualDeleteCount;\n    if (insertCount < actualDeleteCount) {\n      for (k = actualStart; k < len - actualDeleteCount; k++) {\n        from = k + actualDeleteCount;\n        to = k + insertCount;\n        if (from in O) O[to] = O[from];\n        else delete O[to];\n      }\n      for (k = len; k > len - actualDeleteCount + insertCount; k--) delete O[k - 1];\n    } else if (insertCount > actualDeleteCount) {\n      for (k = len - actualDeleteCount; k > actualStart; k--) {\n        from = k + actualDeleteCount - 1;\n        to = k + insertCount - 1;\n        if (from in O) O[to] = O[from];\n        else delete O[to];\n      }\n    }\n    for (k = 0; k < insertCount; k++) {\n      O[k + actualStart] = arguments[k + 2];\n    }\n    O.length = len - actualDeleteCount + insertCount;\n    return A;\n  }\n});\n","var isObject = require('../internals/is-object');\nvar classof = require('../internals/classof-raw');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar MATCH = wellKnownSymbol('match');\n\n// `IsRegExp` abstract operation\n// https://tc39.es/ecma262/#sec-isregexp\nmodule.exports = function (it) {\n  var isRegExp;\n  return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classof(it) == 'RegExp');\n};\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar isRegExp = require('../internals/is-regexp');\nvar anObject = require('../internals/an-object');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar speciesConstructor = require('../internals/species-constructor');\nvar advanceStringIndex = require('../internals/advance-string-index');\nvar toLength = require('../internals/to-length');\nvar callRegExpExec = require('../internals/regexp-exec-abstract');\nvar regexpExec = require('../internals/regexp-exec');\nvar stickyHelpers = require('../internals/regexp-sticky-helpers');\n\nvar UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;\nvar arrayPush = [].push;\nvar min = Math.min;\nvar MAX_UINT32 = 0xFFFFFFFF;\n\n// @@split logic\nfixRegExpWellKnownSymbolLogic('split', 2, function (SPLIT, nativeSplit, maybeCallNative) {\n  var internalSplit;\n  if (\n    'abbc'.split(/(b)*/)[1] == 'c' ||\n    // eslint-disable-next-line regexp/no-empty-group -- required for testing\n    'test'.split(/(?:)/, -1).length != 4 ||\n    'ab'.split(/(?:ab)*/).length != 2 ||\n    '.'.split(/(.?)(.?)/).length != 4 ||\n    // eslint-disable-next-line regexp/no-assertion-capturing-group, regexp/no-empty-group -- required for testing\n    '.'.split(/()()/).length > 1 ||\n    ''.split(/.?/).length\n  ) {\n    // based on es5-shim implementation, need to rework it\n    internalSplit = function (separator, limit) {\n      var string = String(requireObjectCoercible(this));\n      var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;\n      if (lim === 0) return [];\n      if (separator === undefined) return [string];\n      // If `separator` is not a regex, use native split\n      if (!isRegExp(separator)) {\n        return nativeSplit.call(string, separator, lim);\n      }\n      var output = [];\n      var flags = (separator.ignoreCase ? 'i' : '') +\n                  (separator.multiline ? 'm' : '') +\n                  (separator.unicode ? 'u' : '') +\n                  (separator.sticky ? 'y' : '');\n      var lastLastIndex = 0;\n      // Make `global` and avoid `lastIndex` issues by working with a copy\n      var separatorCopy = new RegExp(separator.source, flags + 'g');\n      var match, lastIndex, lastLength;\n      while (match = regexpExec.call(separatorCopy, string)) {\n        lastIndex = separatorCopy.lastIndex;\n        if (lastIndex > lastLastIndex) {\n          output.push(string.slice(lastLastIndex, match.index));\n          if (match.length > 1 && match.index < string.length) arrayPush.apply(output, match.slice(1));\n          lastLength = match[0].length;\n          lastLastIndex = lastIndex;\n          if (output.length >= lim) break;\n        }\n        if (separatorCopy.lastIndex === match.index) separatorCopy.lastIndex++; // Avoid an infinite loop\n      }\n      if (lastLastIndex === string.length) {\n        if (lastLength || !separatorCopy.test('')) output.push('');\n      } else output.push(string.slice(lastLastIndex));\n      return output.length > lim ? output.slice(0, lim) : output;\n    };\n  // Chakra, V8\n  } else if ('0'.split(undefined, 0).length) {\n    internalSplit = function (separator, limit) {\n      return separator === undefined && limit === 0 ? [] : nativeSplit.call(this, separator, limit);\n    };\n  } else internalSplit = nativeSplit;\n\n  return [\n    // `String.prototype.split` method\n    // https://tc39.es/ecma262/#sec-string.prototype.split\n    function split(separator, limit) {\n      var O = requireObjectCoercible(this);\n      var splitter = separator == undefined ? undefined : separator[SPLIT];\n      return splitter !== undefined\n        ? splitter.call(separator, O, limit)\n        : internalSplit.call(String(O), separator, limit);\n    },\n    // `RegExp.prototype[@@split]` method\n    // https://tc39.es/ecma262/#sec-regexp.prototype-@@split\n    //\n    // NOTE: This cannot be properly polyfilled in engines that don't support\n    // the 'y' flag.\n    function (regexp, limit) {\n      var res = maybeCallNative(internalSplit, regexp, this, limit, internalSplit !== nativeSplit);\n      if (res.done) return res.value;\n\n      var rx = anObject(regexp);\n      var S = String(this);\n      var C = speciesConstructor(rx, RegExp);\n\n      var unicodeMatching = rx.unicode;\n      var flags = (rx.ignoreCase ? 'i' : '') +\n                  (rx.multiline ? 'm' : '') +\n                  (rx.unicode ? 'u' : '') +\n                  (UNSUPPORTED_Y ? 'g' : 'y');\n\n      // ^(? + rx + ) is needed, in combination with some S slicing, to\n      // simulate the 'y' flag.\n      var splitter = new C(UNSUPPORTED_Y ? '^(?:' + rx.source + ')' : rx, flags);\n      var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;\n      if (lim === 0) return [];\n      if (S.length === 0) return callRegExpExec(splitter, S) === null ? [S] : [];\n      var p = 0;\n      var q = 0;\n      var A = [];\n      while (q < S.length) {\n        splitter.lastIndex = UNSUPPORTED_Y ? 0 : q;\n        var z = callRegExpExec(splitter, UNSUPPORTED_Y ? S.slice(q) : S);\n        var e;\n        if (\n          z === null ||\n          (e = min(toLength(splitter.lastIndex + (UNSUPPORTED_Y ? q : 0)), S.length)) === p\n        ) {\n          q = advanceStringIndex(S, q, unicodeMatching);\n        } else {\n          A.push(S.slice(p, q));\n          if (A.length === lim) return A;\n          for (var i = 1; i <= z.length - 1; i++) {\n            A.push(z[i]);\n            if (A.length === lim) return A;\n          }\n          q = p = e;\n        }\n      }\n      A.push(S.slice(p));\n      return A;\n    }\n  ];\n}, UNSUPPORTED_Y);\n","var isObject = require('../internals/is-object');\nvar setPrototypeOf = require('../internals/object-set-prototype-of');\n\n// makes subclassing work correct for wrapped built-ins\nmodule.exports = function ($this, dummy, Wrapper) {\n  var NewTarget, NewTargetPrototype;\n  if (\n    // it can work only with native `setPrototypeOf`\n    setPrototypeOf &&\n    // we haven't completely correct pre-ES6 way for getting `new.target`, so use this\n    typeof (NewTarget = dummy.constructor) == 'function' &&\n    NewTarget !== Wrapper &&\n    isObject(NewTargetPrototype = NewTarget.prototype) &&\n    NewTargetPrototype !== Wrapper.prototype\n  ) setPrototypeOf($this, NewTargetPrototype);\n  return $this;\n};\n","'use strict';\nvar DESCRIPTORS = require('../internals/descriptors');\nvar global = require('../internals/global');\nvar isForced = require('../internals/is-forced');\nvar redefine = require('../internals/redefine');\nvar has = require('../internals/has');\nvar classof = require('../internals/classof-raw');\nvar inheritIfRequired = require('../internals/inherit-if-required');\nvar toPrimitive = require('../internals/to-primitive');\nvar fails = require('../internals/fails');\nvar create = require('../internals/object-create');\nvar getOwnPropertyNames = require('../internals/object-get-own-property-names').f;\nvar getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;\nvar defineProperty = require('../internals/object-define-property').f;\nvar trim = require('../internals/string-trim').trim;\n\nvar NUMBER = 'Number';\nvar NativeNumber = global[NUMBER];\nvar NumberPrototype = NativeNumber.prototype;\n\n// Opera ~12 has broken Object#toString\nvar BROKEN_CLASSOF = classof(create(NumberPrototype)) == NUMBER;\n\n// `ToNumber` abstract operation\n// https://tc39.es/ecma262/#sec-tonumber\nvar toNumber = function (argument) {\n  var it = toPrimitive(argument, false);\n  var first, third, radix, maxCode, digits, length, index, code;\n  if (typeof it == 'string' && it.length > 2) {\n    it = trim(it);\n    first = it.charCodeAt(0);\n    if (first === 43 || first === 45) {\n      third = it.charCodeAt(2);\n      if (third === 88 || third === 120) return NaN; // Number('+0x1') should be NaN, old V8 fix\n    } else if (first === 48) {\n      switch (it.charCodeAt(1)) {\n        case 66: case 98: radix = 2; maxCode = 49; break; // fast equal of /^0b[01]+$/i\n        case 79: case 111: radix = 8; maxCode = 55; break; // fast equal of /^0o[0-7]+$/i\n        default: return +it;\n      }\n      digits = it.slice(2);\n      length = digits.length;\n      for (index = 0; index < length; index++) {\n        code = digits.charCodeAt(index);\n        // parseInt parses a string to a first unavailable symbol\n        // but ToNumber should return NaN if a string contains unavailable symbols\n        if (code < 48 || code > maxCode) return NaN;\n      } return parseInt(digits, radix);\n    }\n  } return +it;\n};\n\n// `Number` constructor\n// https://tc39.es/ecma262/#sec-number-constructor\nif (isForced(NUMBER, !NativeNumber(' 0o1') || !NativeNumber('0b1') || NativeNumber('+0x1'))) {\n  var NumberWrapper = function Number(value) {\n    var it = arguments.length < 1 ? 0 : value;\n    var dummy = this;\n    return dummy instanceof NumberWrapper\n      // check on 1..constructor(foo) case\n      && (BROKEN_CLASSOF ? fails(function () { NumberPrototype.valueOf.call(dummy); }) : classof(dummy) != NUMBER)\n        ? inheritIfRequired(new NativeNumber(toNumber(it)), dummy, NumberWrapper) : toNumber(it);\n  };\n  for (var keys = DESCRIPTORS ? getOwnPropertyNames(NativeNumber) : (\n    // ES3:\n    'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' +\n    // ES2015 (in case, if modules with ES2015 Number statics required before):\n    'EPSILON,isFinite,isInteger,isNaN,isSafeInteger,MAX_SAFE_INTEGER,' +\n    'MIN_SAFE_INTEGER,parseFloat,parseInt,isInteger,' +\n    // ESNext\n    'fromString,range'\n  ).split(','), j = 0, key; keys.length > j; j++) {\n    if (has(NativeNumber, key = keys[j]) && !has(NumberWrapper, key)) {\n      defineProperty(NumberWrapper, key, getOwnPropertyDescriptor(NativeNumber, key));\n    }\n  }\n  NumberWrapper.prototype = NumberPrototype;\n  NumberPrototype.constructor = NumberWrapper;\n  redefine(global, NUMBER, NumberWrapper);\n}\n","var DESCRIPTORS = require('../internals/descriptors');\nvar defineProperty = require('../internals/object-define-property').f;\n\nvar FunctionPrototype = Function.prototype;\nvar FunctionPrototypeToString = FunctionPrototype.toString;\nvar nameRE = /^\\s*function ([^ (]*)/;\nvar NAME = 'name';\n\n// Function instances `.name` property\n// https://tc39.es/ecma262/#sec-function-instances-name\nif (DESCRIPTORS && !(NAME in FunctionPrototype)) {\n  defineProperty(FunctionPrototype, NAME, {\n    configurable: true,\n    get: function () {\n      try {\n        return FunctionPrototypeToString.call(this).match(nameRE)[1];\n      } catch (error) {\n        return '';\n      }\n    }\n  });\n}\n","'use strict';\nvar $ = require('../internals/export');\nvar IndexedObject = require('../internals/indexed-object');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar arrayMethodIsStrict = require('../internals/array-method-is-strict');\n\nvar nativeJoin = [].join;\n\nvar ES3_STRINGS = IndexedObject != Object;\nvar STRICT_METHOD = arrayMethodIsStrict('join', ',');\n\n// `Array.prototype.join` method\n// https://tc39.es/ecma262/#sec-array.prototype.join\n$({ target: 'Array', proto: true, forced: ES3_STRINGS || !STRICT_METHOD }, {\n  join: function join(separator) {\n    return nativeJoin.call(toIndexedObject(this), separator === undefined ? ',' : separator);\n  }\n});\n","var toObject = require('../internals/to-object');\n\nvar floor = Math.floor;\nvar replace = ''.replace;\nvar SUBSTITUTION_SYMBOLS = /\\$([$&'`]|\\d{1,2}|<[^>]*>)/g;\nvar SUBSTITUTION_SYMBOLS_NO_NAMED = /\\$([$&'`]|\\d{1,2})/g;\n\n// https://tc39.es/ecma262/#sec-getsubstitution\nmodule.exports = function (matched, str, position, captures, namedCaptures, replacement) {\n  var tailPos = position + matched.length;\n  var m = captures.length;\n  var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED;\n  if (namedCaptures !== undefined) {\n    namedCaptures = toObject(namedCaptures);\n    symbols = SUBSTITUTION_SYMBOLS;\n  }\n  return replace.call(replacement, symbols, function (match, ch) {\n    var capture;\n    switch (ch.charAt(0)) {\n      case '$': return '$';\n      case '&': return matched;\n      case '`': return str.slice(0, position);\n      case \"'\": return str.slice(tailPos);\n      case '<':\n        capture = namedCaptures[ch.slice(1, -1)];\n        break;\n      default: // \\d\\d?\n        var n = +ch;\n        if (n === 0) return match;\n        if (n > m) {\n          var f = floor(n / 10);\n          if (f === 0) return match;\n          if (f <= m) return captures[f - 1] === undefined ? ch.charAt(1) : captures[f - 1] + ch.charAt(1);\n          return match;\n        }\n        capture = captures[n - 1];\n    }\n    return capture === undefined ? '' : capture;\n  });\n};\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar anObject = require('../internals/an-object');\nvar toLength = require('../internals/to-length');\nvar toInteger = require('../internals/to-integer');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar advanceStringIndex = require('../internals/advance-string-index');\nvar getSubstitution = require('../internals/get-substitution');\nvar regExpExec = require('../internals/regexp-exec-abstract');\n\nvar max = Math.max;\nvar min = Math.min;\n\nvar maybeToString = function (it) {\n  return it === undefined ? it : String(it);\n};\n\n// @@replace logic\nfixRegExpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, maybeCallNative, reason) {\n  var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = reason.REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE;\n  var REPLACE_KEEPS_$0 = reason.REPLACE_KEEPS_$0;\n  var UNSAFE_SUBSTITUTE = REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE ? '$' : '$0';\n\n  return [\n    // `String.prototype.replace` method\n    // https://tc39.es/ecma262/#sec-string.prototype.replace\n    function replace(searchValue, replaceValue) {\n      var O = requireObjectCoercible(this);\n      var replacer = searchValue == undefined ? undefined : searchValue[REPLACE];\n      return replacer !== undefined\n        ? replacer.call(searchValue, O, replaceValue)\n        : nativeReplace.call(String(O), searchValue, replaceValue);\n    },\n    // `RegExp.prototype[@@replace]` method\n    // https://tc39.es/ecma262/#sec-regexp.prototype-@@replace\n    function (regexp, replaceValue) {\n      if (\n        (!REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE && REPLACE_KEEPS_$0) ||\n        (typeof replaceValue === 'string' && replaceValue.indexOf(UNSAFE_SUBSTITUTE) === -1)\n      ) {\n        var res = maybeCallNative(nativeReplace, regexp, this, replaceValue);\n        if (res.done) return res.value;\n      }\n\n      var rx = anObject(regexp);\n      var S = String(this);\n\n      var functionalReplace = typeof replaceValue === 'function';\n      if (!functionalReplace) replaceValue = String(replaceValue);\n\n      var global = rx.global;\n      if (global) {\n        var fullUnicode = rx.unicode;\n        rx.lastIndex = 0;\n      }\n      var results = [];\n      while (true) {\n        var result = regExpExec(rx, S);\n        if (result === null) break;\n\n        results.push(result);\n        if (!global) break;\n\n        var matchStr = String(result[0]);\n        if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);\n      }\n\n      var accumulatedResult = '';\n      var nextSourcePosition = 0;\n      for (var i = 0; i < results.length; i++) {\n        result = results[i];\n\n        var matched = String(result[0]);\n        var position = max(min(toInteger(result.index), S.length), 0);\n        var captures = [];\n        // NOTE: This is equivalent to\n        //   captures = result.slice(1).map(maybeToString)\n        // but for some reason `nativeSlice.call(result, 1, result.length)` (called in\n        // the slice polyfill when slicing native arrays) \"doesn't work\" in safari 9 and\n        // causes a crash (https://pastebin.com/N21QzeQA) when trying to debug it.\n        for (var j = 1; j < result.length; j++) captures.push(maybeToString(result[j]));\n        var namedCaptures = result.groups;\n        if (functionalReplace) {\n          var replacerArgs = [matched].concat(captures, position, S);\n          if (namedCaptures !== undefined) replacerArgs.push(namedCaptures);\n          var replacement = String(replaceValue.apply(undefined, replacerArgs));\n        } else {\n          replacement = getSubstitution(matched, S, position, captures, namedCaptures, replaceValue);\n        }\n        if (position >= nextSourcePosition) {\n          accumulatedResult += S.slice(nextSourcePosition, position) + replacement;\n          nextSourcePosition = position + matched.length;\n        }\n      }\n      return accumulatedResult + S.slice(nextSourcePosition);\n    }\n  ];\n});\n","// `SameValue` abstract operation\n// https://tc39.es/ecma262/#sec-samevalue\n// eslint-disable-next-line es/no-object-is -- safe\nmodule.exports = Object.is || function is(x, y) {\n  // eslint-disable-next-line no-self-compare -- NaN check\n  return x === y ? x !== 0 || 1 / x === 1 / y : x != x && y != y;\n};\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar anObject = require('../internals/an-object');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar sameValue = require('../internals/same-value');\nvar regExpExec = require('../internals/regexp-exec-abstract');\n\n// @@search logic\nfixRegExpWellKnownSymbolLogic('search', 1, function (SEARCH, nativeSearch, maybeCallNative) {\n  return [\n    // `String.prototype.search` method\n    // https://tc39.es/ecma262/#sec-string.prototype.search\n    function search(regexp) {\n      var O = requireObjectCoercible(this);\n      var searcher = regexp == undefined ? undefined : regexp[SEARCH];\n      return searcher !== undefined ? searcher.call(regexp, O) : new RegExp(regexp)[SEARCH](String(O));\n    },\n    // `RegExp.prototype[@@search]` method\n    // https://tc39.es/ecma262/#sec-regexp.prototype-@@search\n    function (regexp) {\n      var res = maybeCallNative(nativeSearch, regexp, this);\n      if (res.done) return res.value;\n\n      var rx = anObject(regexp);\n      var S = String(this);\n\n      var previousLastIndex = rx.lastIndex;\n      if (!sameValue(previousLastIndex, 0)) rx.lastIndex = 0;\n      var result = regExpExec(rx, S);\n      if (!sameValue(rx.lastIndex, previousLastIndex)) rx.lastIndex = previousLastIndex;\n      return result === null ? -1 : result.index;\n    }\n  ];\n});\n","/**\n * Extend object a with the properties of object b.\n * If there's a conflict, object b takes precedence.\n *\n * @param {object} a\n * @param {object} b\n */\nexport const extend = ( a, b ) => {\n\n\tfor( let i in b ) {\n\t\ta[ i ] = b[ i ];\n\t}\n\n\treturn a;\n\n}\n\n/**\n * querySelectorAll but returns an Array.\n */\nexport const queryAll = ( el, selector ) => {\n\n\treturn Array.from( el.querySelectorAll( selector ) );\n\n}\n\n/**\n * classList.toggle() with cross browser support\n */\nexport const toggleClass = ( el, className, value ) => {\n\tif( value ) {\n\t\tel.classList.add( className );\n\t}\n\telse {\n\t\tel.classList.remove( className );\n\t}\n}\n\n/**\n * Utility for deserializing a value.\n *\n * @param {*} value\n * @return {*}\n */\nexport const deserialize = ( value ) => {\n\n\tif( typeof value === 'string' ) {\n\t\tif( value === 'null' ) return null;\n\t\telse if( value === 'true' ) return true;\n\t\telse if( value === 'false' ) return false;\n\t\telse if( value.match( /^-?[\\d\\.]+$/ ) ) return parseFloat( value );\n\t}\n\n\treturn value;\n\n}\n\n/**\n * Measures the distance in pixels between point a\n * and point b.\n *\n * @param {object} a point with x/y properties\n * @param {object} b point with x/y properties\n *\n * @return {number}\n */\nexport const distanceBetween = ( a, b ) => {\n\n\tlet dx = a.x - b.x,\n\t\tdy = a.y - b.y;\n\n\treturn Math.sqrt( dx*dx + dy*dy );\n\n}\n\n/**\n * Applies a CSS transform to the target element.\n *\n * @param {HTMLElement} element\n * @param {string} transform\n */\nexport const transformElement = ( element, transform ) => {\n\n\telement.style.transform = transform;\n\n}\n\n/**\n * Element.matches with IE support.\n *\n * @param {HTMLElement} target The element to match\n * @param {String} selector The CSS selector to match\n * the element against\n *\n * @return {Boolean}\n */\nexport const matches = ( target, selector ) => {\n\n\tlet matchesMethod = target.matches || target.matchesSelector || target.msMatchesSelector;\n\n\treturn !!( matchesMethod && matchesMethod.call( target, selector ) );\n\n}\n\n/**\n * Find the closest parent that matches the given\n * selector.\n *\n * @param {HTMLElement} target The child element\n * @param {String} selector The CSS selector to match\n * the parents against\n *\n * @return {HTMLElement} The matched parent or null\n * if no matching parent was found\n */\nexport const closest = ( target, selector ) => {\n\n\t// Native Element.closest\n\tif( typeof target.closest === 'function' ) {\n\t\treturn target.closest( selector );\n\t}\n\n\t// Polyfill\n\twhile( target ) {\n\t\tif( matches( target, selector ) ) {\n\t\t\treturn target;\n\t\t}\n\n\t\t// Keep searching\n\t\ttarget = target.parentNode;\n\t}\n\n\treturn null;\n\n}\n\n/**\n * Handling the fullscreen functionality via the fullscreen API\n *\n * @see http://fullscreen.spec.whatwg.org/\n * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode\n */\nexport const enterFullscreen = element => {\n\n\telement = element || document.documentElement;\n\n\t// Check which implementation is available\n\tlet requestMethod = element.requestFullscreen ||\n\t\t\t\t\t\telement.webkitRequestFullscreen ||\n\t\t\t\t\t\telement.webkitRequestFullScreen ||\n\t\t\t\t\t\telement.mozRequestFullScreen ||\n\t\t\t\t\t\telement.msRequestFullscreen;\n\n\tif( requestMethod ) {\n\t\trequestMethod.apply( element );\n\t}\n\n}\n\n/**\n * Creates an HTML element and returns a reference to it.\n * If the element already exists the existing instance will\n * be returned.\n *\n * @param {HTMLElement} container\n * @param {string} tagname\n * @param {string} classname\n * @param {string} innerHTML\n *\n * @return {HTMLElement}\n */\nexport const createSingletonNode = ( container, tagname, classname, innerHTML='' ) => {\n\n\t// Find all nodes matching the description\n\tlet nodes = container.querySelectorAll( '.' + classname );\n\n\t// Check all matches to find one which is a direct child of\n\t// the specified container\n\tfor( let i = 0; i < nodes.length; i++ ) {\n\t\tlet testNode = nodes[i];\n\t\tif( testNode.parentNode === container ) {\n\t\t\treturn testNode;\n\t\t}\n\t}\n\n\t// If no node was found, create it now\n\tlet node = document.createElement( tagname );\n\tnode.className = classname;\n\tnode.innerHTML = innerHTML;\n\tcontainer.appendChild( node );\n\n\treturn node;\n\n}\n\n/**\n * Injects the given CSS styles into the DOM.\n *\n * @param {string} value\n */\nexport const createStyleSheet = ( value ) => {\n\n\tlet tag = document.createElement( 'style' );\n\ttag.type = 'text/css';\n\n\tif( value && value.length > 0 ) {\n\t\tif( tag.styleSheet ) {\n\t\t\ttag.styleSheet.cssText = value;\n\t\t}\n\t\telse {\n\t\t\ttag.appendChild( document.createTextNode( value ) );\n\t\t}\n\t}\n\n\tdocument.head.appendChild( tag );\n\n\treturn tag;\n\n}\n\n/**\n * Returns a key:value hash of all query params.\n */\nexport const getQueryHash = () => {\n\n\tlet query = {};\n\n\tlocation.search.replace( /[A-Z0-9]+?=([\\w\\.%-]*)/gi, a => {\n\t\tquery[ a.split( '=' ).shift() ] = a.split( '=' ).pop();\n\t} );\n\n\t// Basic deserialization\n\tfor( let i in query ) {\n\t\tlet value = query[ i ];\n\n\t\tquery[ i ] = deserialize( unescape( value ) );\n\t}\n\n\t// Do not accept new dependencies via query config to avoid\n\t// the potential of malicious script injection\n\tif( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];\n\n\treturn query;\n\n}\n\n/**\n * Returns the remaining height within the parent of the\n * target element.\n *\n * remaining height = [ configured parent height ] - [ current parent height ]\n *\n * @param {HTMLElement} element\n * @param {number} [height]\n */\nexport const getRemainingHeight = ( element, height = 0 ) => {\n\n\tif( element ) {\n\t\tlet newHeight, oldHeight = element.style.height;\n\n\t\t// Change the .stretch element height to 0 in order find the height of all\n\t\t// the other elements\n\t\telement.style.height = '0px';\n\n\t\t// In Overview mode, the parent (.slide) height is set of 700px.\n\t\t// Restore it temporarily to its natural height.\n\t\telement.parentNode.style.height = 'auto';\n\n\t\tnewHeight = height - element.parentNode.offsetHeight;\n\n\t\t// Restore the old height, just in case\n\t\telement.style.height = oldHeight + 'px';\n\n\t\t// Clear the parent (.slide) height. .removeProperty works in IE9+\n\t\telement.parentNode.style.removeProperty('height');\n\n\t\treturn newHeight;\n\t}\n\n\treturn height;\n\n}\n\nconst fileExtensionToMimeMap = {\n\t'mp4': 'video/mp4',\n\t'm4a': 'video/mp4',\n\t'ogv': 'video/ogg',\n\t'mpeg': 'video/mpeg',\n\t'webm': 'video/webm'\n}\n\n/**\n * Guess the MIME type for common file formats.\n */\nexport const getMimeTypeFromFile = ( filename='' ) => {\n\treturn fileExtensionToMimeMap[filename.split('.').pop()]\n}","const UA = navigator.userAgent;\n\nexport const isMobile = /(iphone|ipod|ipad|android)/gi.test( UA ) ||\n\t\t\t\t\t\t( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS\n\nexport const isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );\n\nexport const isAndroid = /android/gi.test( UA );","/*\n * fitty v2.3.3 - Snugly resizes text to fit its parent container\n * Copyright (c) 2020 Rik Schennink <rik@pqina.nl> (https://pqina.nl/)\n */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };\n\nexports.default = function (w) {\n\n  // no window, early exit\n  if (!w) return;\n\n  // node list to array helper method\n  var toArray = function toArray(nl) {\n    return [].slice.call(nl);\n  };\n\n  // states\n  var DrawState = {\n    IDLE: 0,\n    DIRTY_CONTENT: 1,\n    DIRTY_LAYOUT: 2,\n    DIRTY: 3\n  };\n\n  // all active fitty elements\n  var fitties = [];\n\n  // group all redraw calls till next frame, we cancel each frame request when a new one comes in. If no support for request animation frame, this is an empty function and supports for fitty stops.\n  var redrawFrame = null;\n  var requestRedraw = 'requestAnimationFrame' in w ? function () {\n    w.cancelAnimationFrame(redrawFrame);\n    redrawFrame = w.requestAnimationFrame(function () {\n      return redraw(fitties.filter(function (f) {\n        return f.dirty && f.active;\n      }));\n    });\n  } : function () {};\n\n  // sets all fitties to dirty so they are redrawn on the next redraw loop, then calls redraw\n  var redrawAll = function redrawAll(type) {\n    return function () {\n      fitties.forEach(function (f) {\n        return f.dirty = type;\n      });\n      requestRedraw();\n    };\n  };\n\n  // redraws fitties so they nicely fit their parent container\n  var redraw = function redraw(fitties) {\n\n    // getting info from the DOM at this point should not trigger a reflow, let's gather as much intel as possible before triggering a reflow\n\n    // check if styles of all fitties have been computed\n    fitties.filter(function (f) {\n      return !f.styleComputed;\n    }).forEach(function (f) {\n      f.styleComputed = computeStyle(f);\n    });\n\n    // restyle elements that require pre-styling, this triggers a reflow, please try to prevent by adding CSS rules (see docs)\n    fitties.filter(shouldPreStyle).forEach(applyStyle);\n\n    // we now determine which fitties should be redrawn\n    var fittiesToRedraw = fitties.filter(shouldRedraw);\n\n    // we calculate final styles for these fitties\n    fittiesToRedraw.forEach(calculateStyles);\n\n    // now we apply the calculated styles from our previous loop\n    fittiesToRedraw.forEach(function (f) {\n      applyStyle(f);\n      markAsClean(f);\n    });\n\n    // now we dispatch events for all restyled fitties\n    fittiesToRedraw.forEach(dispatchFitEvent);\n  };\n\n  var markAsClean = function markAsClean(f) {\n    return f.dirty = DrawState.IDLE;\n  };\n\n  var calculateStyles = function calculateStyles(f) {\n\n    // get available width from parent node\n    f.availableWidth = f.element.parentNode.clientWidth;\n\n    // the space our target element uses\n    f.currentWidth = f.element.scrollWidth;\n\n    // remember current font size\n    f.previousFontSize = f.currentFontSize;\n\n    // let's calculate the new font size\n    f.currentFontSize = Math.min(Math.max(f.minSize, f.availableWidth / f.currentWidth * f.previousFontSize), f.maxSize);\n\n    // if allows wrapping, only wrap when at minimum font size (otherwise would break container)\n    f.whiteSpace = f.multiLine && f.currentFontSize === f.minSize ? 'normal' : 'nowrap';\n  };\n\n  // should always redraw if is not dirty layout, if is dirty layout, only redraw if size has changed\n  var shouldRedraw = function shouldRedraw(f) {\n    return f.dirty !== DrawState.DIRTY_LAYOUT || f.dirty === DrawState.DIRTY_LAYOUT && f.element.parentNode.clientWidth !== f.availableWidth;\n  };\n\n  // every fitty element is tested for invalid styles\n  var computeStyle = function computeStyle(f) {\n\n    // get style properties\n    var style = w.getComputedStyle(f.element, null);\n\n    // get current font size in pixels (if we already calculated it, use the calculated version)\n    f.currentFontSize = parseFloat(style.getPropertyValue('font-size'));\n\n    // get display type and wrap mode\n    f.display = style.getPropertyValue('display');\n    f.whiteSpace = style.getPropertyValue('white-space');\n  };\n\n  // determines if this fitty requires initial styling, can be prevented by applying correct styles through CSS\n  var shouldPreStyle = function shouldPreStyle(f) {\n\n    var preStyle = false;\n\n    // if we already tested for prestyling we don't have to do it again\n    if (f.preStyleTestCompleted) return false;\n\n    // should have an inline style, if not, apply\n    if (!/inline-/.test(f.display)) {\n      preStyle = true;\n      f.display = 'inline-block';\n    }\n\n    // to correctly calculate dimensions the element should have whiteSpace set to nowrap\n    if (f.whiteSpace !== 'nowrap') {\n      preStyle = true;\n      f.whiteSpace = 'nowrap';\n    }\n\n    // we don't have to do this twice\n    f.preStyleTestCompleted = true;\n\n    return preStyle;\n  };\n\n  // apply styles to single fitty\n  var applyStyle = function applyStyle(f) {\n    f.element.style.whiteSpace = f.whiteSpace;\n    f.element.style.display = f.display;\n    f.element.style.fontSize = f.currentFontSize + 'px';\n  };\n\n  // dispatch a fit event on a fitty\n  var dispatchFitEvent = function dispatchFitEvent(f) {\n    f.element.dispatchEvent(new CustomEvent('fit', {\n      detail: {\n        oldValue: f.previousFontSize,\n        newValue: f.currentFontSize,\n        scaleFactor: f.currentFontSize / f.previousFontSize\n      }\n    }));\n  };\n\n  // fit method, marks the fitty as dirty and requests a redraw (this will also redraw any other fitty marked as dirty)\n  var fit = function fit(f, type) {\n    return function () {\n      f.dirty = type;\n      if (!f.active) return;\n      requestRedraw();\n    };\n  };\n\n  var init = function init(f) {\n\n    // save some of the original CSS properties before we change them\n    f.originalStyle = {\n      whiteSpace: f.element.style.whiteSpace,\n      display: f.element.style.display,\n      fontSize: f.element.style.fontSize\n    };\n\n    // should we observe DOM mutations\n    observeMutations(f);\n\n    // this is a new fitty so we need to validate if it's styles are in order\n    f.newbie = true;\n\n    // because it's a new fitty it should also be dirty, we want it to redraw on the first loop\n    f.dirty = true;\n\n    // we want to be able to update this fitty\n    fitties.push(f);\n  };\n\n  var destroy = function destroy(f) {\n    return function () {\n\n      // remove from fitties array\n      fitties = fitties.filter(function (_) {\n        return _.element !== f.element;\n      });\n\n      // stop observing DOM\n      if (f.observeMutations) f.observer.disconnect();\n\n      // reset the CSS properties we changes\n      f.element.style.whiteSpace = f.originalStyle.whiteSpace;\n      f.element.style.display = f.originalStyle.display;\n      f.element.style.fontSize = f.originalStyle.fontSize;\n    };\n  };\n\n  // add a new fitty, does not redraw said fitty\n  var subscribe = function subscribe(f) {\n    return function () {\n      if (f.active) return;\n      f.active = true;\n      requestRedraw();\n    };\n  };\n\n  // remove an existing fitty\n  var unsubscribe = function unsubscribe(f) {\n    return function () {\n      return f.active = false;\n    };\n  };\n\n  var observeMutations = function observeMutations(f) {\n\n    // no observing?\n    if (!f.observeMutations) return;\n\n    // start observing mutations\n    f.observer = new MutationObserver(fit(f, DrawState.DIRTY_CONTENT));\n\n    // start observing\n    f.observer.observe(f.element, f.observeMutations);\n  };\n\n  // default mutation observer settings\n  var mutationObserverDefaultSetting = {\n    subtree: true,\n    childList: true,\n    characterData: true\n  };\n\n  // default fitty options\n  var defaultOptions = {\n    minSize: 16,\n    maxSize: 512,\n    multiLine: true,\n    observeMutations: 'MutationObserver' in w ? mutationObserverDefaultSetting : false\n  };\n\n  // array of elements in, fitty instances out\n  function fittyCreate(elements, options) {\n\n    // set options object\n    var fittyOptions = _extends({}, defaultOptions, options);\n\n    // create fitties\n    var publicFitties = elements.map(function (element) {\n\n      // create fitty instance\n      var f = _extends({}, fittyOptions, {\n\n        // internal options for this fitty\n        element: element,\n        active: true\n      });\n\n      // initialise this fitty\n      init(f);\n\n      // expose API\n      return {\n        element: element,\n        fit: fit(f, DrawState.DIRTY),\n        unfreeze: subscribe(f),\n        freeze: unsubscribe(f),\n        unsubscribe: destroy(f)\n      };\n    });\n\n    // call redraw on newly initiated fitties\n    requestRedraw();\n\n    // expose fitties\n    return publicFitties;\n  }\n\n  // fitty creation function\n  function fitty(target) {\n    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n\n\n    // if target is a string\n    return typeof target === 'string' ?\n\n    // treat it as a querySelector\n    fittyCreate(toArray(document.querySelectorAll(target)), options) :\n\n    // create single fitty\n    fittyCreate([target], options)[0];\n  }\n\n  // handles viewport changes, redraws all fitties, but only does so after a timeout\n  var resizeDebounce = null;\n  var onWindowResized = function onWindowResized() {\n    w.clearTimeout(resizeDebounce);\n    resizeDebounce = w.setTimeout(redrawAll(DrawState.DIRTY_LAYOUT), fitty.observeWindowDelay);\n  };\n\n  // define observe window property, so when we set it to true or false events are automatically added and removed\n  var events = ['resize', 'orientationchange'];\n  Object.defineProperty(fitty, 'observeWindow', {\n    set: function set(enabled) {\n      var method = (enabled ? 'add' : 'remove') + 'EventListener';\n      events.forEach(function (e) {\n        w[method](e, onWindowResized);\n      });\n    }\n  });\n\n  // fitty global properties (by setting observeWindow to true the events above get added)\n  fitty.observeWindow = true;\n  fitty.observeWindowDelay = 100;\n\n  // public fit all method, will force redraw no matter what\n  fitty.fitAll = redrawAll(DrawState.DIRTY);\n\n  // export our fitty function, we don't want to keep it to our selves\n  return fitty;\n}(typeof window === 'undefined' ? null : window);","import { extend, queryAll, closest, getMimeTypeFromFile } from '../utils/util.js'\nimport { isMobile } from '../utils/device.js'\n\nimport fitty from 'fitty';\n\n/**\n * Handles loading, unloading and playback of slide\n * content such as images, videos and iframes.\n */\nexport default class SlideContent {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.startEmbeddedIframe = this.startEmbeddedIframe.bind( this );\n\n\t}\n\n\t/**\n\t * Should the given element be preloaded?\n\t * Decides based on local element attributes and global config.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tshouldPreload( element ) {\n\n\t\t// Prefer an explicit global preload setting\n\t\tlet preload = this.Reveal.getConfig().preloadIframes;\n\n\t\t// If no global setting is available, fall back on the element's\n\t\t// own preload setting\n\t\tif( typeof preload !== 'boolean' ) {\n\t\t\tpreload = element.hasAttribute( 'data-preload' );\n\t\t}\n\n\t\treturn preload;\n\t}\n\n\t/**\n\t * Called when the given slide is within the configured view\n\t * distance. Shows the slide element and loads any content\n\t * that is set to load lazily (data-src).\n\t *\n\t * @param {HTMLElement} slide Slide to show\n\t */\n\tload( slide, options = {} ) {\n\n\t\t// Show the slide element\n\t\tslide.style.display = this.Reveal.getConfig().display;\n\n\t\t// Media elements with data-src attributes\n\t\tqueryAll( slide, 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ).forEach( element => {\n\t\t\tif( element.tagName !== 'IFRAME' || this.shouldPreload( element ) ) {\n\t\t\t\telement.setAttribute( 'src', element.getAttribute( 'data-src' ) );\n\t\t\t\telement.setAttribute( 'data-lazy-loaded', '' );\n\t\t\t\telement.removeAttribute( 'data-src' );\n\t\t\t}\n\t\t} );\n\n\t\t// Media elements with <source> children\n\t\tqueryAll( slide, 'video, audio' ).forEach( media => {\n\t\t\tlet sources = 0;\n\n\t\t\tqueryAll( media, 'source[data-src]' ).forEach( source => {\n\t\t\t\tsource.setAttribute( 'src', source.getAttribute( 'data-src' ) );\n\t\t\t\tsource.removeAttribute( 'data-src' );\n\t\t\t\tsource.setAttribute( 'data-lazy-loaded', '' );\n\t\t\t\tsources += 1;\n\t\t\t} );\n\n\t\t\t// Enable inline video playback in mobile Safari\n\t\t\tif( isMobile && media.tagName === 'VIDEO' ) {\n\t\t\t\tmedia.setAttribute( 'playsinline', '' );\n\t\t\t}\n\n\t\t\t// If we rewrote sources for this video/audio element, we need\n\t\t\t// to manually tell it to load from its new origin\n\t\t\tif( sources > 0 ) {\n\t\t\t\tmedia.load();\n\t\t\t}\n\t\t} );\n\n\n\t\t// Show the corresponding background element\n\t\tlet background = slide.slideBackgroundElement;\n\t\tif( background ) {\n\t\t\tbackground.style.display = 'block';\n\n\t\t\tlet backgroundContent = slide.slideBackgroundContentElement;\n\t\t\tlet backgroundIframe = slide.getAttribute( 'data-background-iframe' );\n\n\t\t\t// If the background contains media, load it\n\t\t\tif( background.hasAttribute( 'data-loaded' ) === false ) {\n\t\t\t\tbackground.setAttribute( 'data-loaded', 'true' );\n\n\t\t\t\tlet backgroundImage = slide.getAttribute( 'data-background-image' ),\n\t\t\t\t\tbackgroundVideo = slide.getAttribute( 'data-background-video' ),\n\t\t\t\t\tbackgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),\n\t\t\t\t\tbackgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );\n\n\t\t\t\t// Images\n\t\t\t\tif( backgroundImage ) {\n\t\t\t\t\t// base64\n\t\t\t\t\tif(  /^data:/.test( backgroundImage.trim() ) ) {\n\t\t\t\t\t\tbackgroundContent.style.backgroundImage = `url(${backgroundImage.trim()})`;\n\t\t\t\t\t}\n\t\t\t\t\t// URL(s)\n\t\t\t\t\telse {\n\t\t\t\t\t\tbackgroundContent.style.backgroundImage = backgroundImage.split( ',' ).map( background => {\n\t\t\t\t\t\t\treturn `url(${encodeURI(background.trim())})`;\n\t\t\t\t\t\t}).join( ',' );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Videos\n\t\t\t\telse if ( backgroundVideo && !this.Reveal.isSpeakerNotes() ) {\n\t\t\t\t\tlet video = document.createElement( 'video' );\n\n\t\t\t\t\tif( backgroundVideoLoop ) {\n\t\t\t\t\t\tvideo.setAttribute( 'loop', '' );\n\t\t\t\t\t}\n\n\t\t\t\t\tif( backgroundVideoMuted ) {\n\t\t\t\t\t\tvideo.muted = true;\n\t\t\t\t\t}\n\n\t\t\t\t\t// Enable inline playback in mobile Safari\n\t\t\t\t\t//\n\t\t\t\t\t// Mute is required for video to play when using\n\t\t\t\t\t// swipe gestures to navigate since they don't\n\t\t\t\t\t// count as direct user actions :'(\n\t\t\t\t\tif( isMobile ) {\n\t\t\t\t\t\tvideo.muted = true;\n\t\t\t\t\t\tvideo.setAttribute( 'playsinline', '' );\n\t\t\t\t\t}\n\n\t\t\t\t\t// Support comma separated lists of video sources\n\t\t\t\t\tbackgroundVideo.split( ',' ).forEach( source => {\n\t\t\t\t\t\tlet type = getMimeTypeFromFile( source );\n\t\t\t\t\t\tif( type ) {\n\t\t\t\t\t\t\tvideo.innerHTML += `<source src=\"${source}\" type=\"${type}\">`;\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tvideo.innerHTML += `<source src=\"${source}\">`;\n\t\t\t\t\t\t}\n\t\t\t\t\t} );\n\n\t\t\t\t\tbackgroundContent.appendChild( video );\n\t\t\t\t}\n\t\t\t\t// Iframes\n\t\t\t\telse if( backgroundIframe && options.excludeIframes !== true ) {\n\t\t\t\t\tlet iframe = document.createElement( 'iframe' );\n\t\t\t\t\tiframe.setAttribute( 'allowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'mozallowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'webkitallowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'allow', 'autoplay' );\n\n\t\t\t\t\tiframe.setAttribute( 'data-src', backgroundIframe );\n\n\t\t\t\t\tiframe.style.width  = '100%';\n\t\t\t\t\tiframe.style.height = '100%';\n\t\t\t\t\tiframe.style.maxHeight = '100%';\n\t\t\t\t\tiframe.style.maxWidth = '100%';\n\n\t\t\t\t\tbackgroundContent.appendChild( iframe );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Start loading preloadable iframes\n\t\t\tlet backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );\n\t\t\tif( backgroundIframeElement ) {\n\n\t\t\t\t// Check if this iframe is eligible to be preloaded\n\t\t\t\tif( this.shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {\n\t\t\t\t\tif( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {\n\t\t\t\t\t\tbackgroundIframeElement.setAttribute( 'src', backgroundIframe );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\tthis.layout( slide );\n\n\t}\n\n\t/**\n\t * Applies JS-dependent layout helpers for the given slide,\n\t * if there are any.\n\t */\n\tlayout( slide ) {\n\n\t\t// Autosize text with the r-fit-text class based on the\n\t\t// size of its container. This needs to happen after the\n\t\t// slide is visible in order to measure the text.\n\t\tArray.from( slide.querySelectorAll( '.r-fit-text' ) ).forEach( element => {\n\t\t\tfitty( element, {\n\t\t\t\tminSize: 24,\n\t\t\t\tmaxSize: this.Reveal.getConfig().height * 0.8,\n\t\t\t\tobserveMutations: false,\n\t\t\t\tobserveWindow: false\n\t\t\t} );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Unloads and hides the given slide. This is called when the\n\t * slide is moved outside of the configured view distance.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tunload( slide ) {\n\n\t\t// Hide the slide element\n\t\tslide.style.display = 'none';\n\n\t\t// Hide the corresponding background element\n\t\tlet background = this.Reveal.getSlideBackground( slide );\n\t\tif( background ) {\n\t\t\tbackground.style.display = 'none';\n\n\t\t\t// Unload any background iframes\n\t\t\tqueryAll( background, 'iframe[src]' ).forEach( element => {\n\t\t\t\telement.removeAttribute( 'src' );\n\t\t\t} );\n\t\t}\n\n\t\t// Reset lazy-loaded media elements with src attributes\n\t\tqueryAll( slide, 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ).forEach( element => {\n\t\t\telement.setAttribute( 'data-src', element.getAttribute( 'src' ) );\n\t\t\telement.removeAttribute( 'src' );\n\t\t} );\n\n\t\t// Reset lazy-loaded media elements with <source> children\n\t\tqueryAll( slide, 'video[data-lazy-loaded] source[src], audio source[src]' ).forEach( source => {\n\t\t\tsource.setAttribute( 'data-src', source.getAttribute( 'src' ) );\n\t\t\tsource.removeAttribute( 'src' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Enforces origin-specific format rules for embedded media.\n\t */\n\tformatEmbeddedContent() {\n\n\t\tlet _appendParamToIframeSource = ( sourceAttribute, sourceURL, param ) => {\n\t\t\tqueryAll( this.Reveal.getSlidesElement(), 'iframe['+ sourceAttribute +'*=\"'+ sourceURL +'\"]' ).forEach( el => {\n\t\t\t\tlet src = el.getAttribute( sourceAttribute );\n\t\t\t\tif( src && src.indexOf( param ) === -1 ) {\n\t\t\t\t\tel.setAttribute( sourceAttribute, src + ( !/\\?/.test( src ) ? '?' : '&' ) + param );\n\t\t\t\t}\n\t\t\t});\n\t\t};\n\n\t\t// YouTube frames must include \"?enablejsapi=1\"\n\t\t_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );\n\t\t_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );\n\n\t\t// Vimeo frames must include \"?api=1\"\n\t\t_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );\n\t\t_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );\n\n\t}\n\n\t/**\n\t * Start playback of any embedded content inside of\n\t * the given element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tstartEmbeddedContent( element ) {\n\n\t\tif( element && !this.Reveal.isSpeakerNotes() ) {\n\n\t\t\t// Restart GIFs\n\t\t\tqueryAll( element, 'img[src$=\".gif\"]' ).forEach( el => {\n\t\t\t\t// Setting the same unchanged source like this was confirmed\n\t\t\t\t// to work in Chrome, FF & Safari\n\t\t\t\tel.setAttribute( 'src', el.getAttribute( 'src' ) );\n\t\t\t} );\n\n\t\t\t// HTML5 media elements\n\t\t\tqueryAll( element, 'video, audio' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\t// Prefer an explicit global autoplay setting\n\t\t\t\tlet autoplay = this.Reveal.getConfig().autoPlayMedia;\n\n\t\t\t\t// If no global setting is available, fall back on the element's\n\t\t\t\t// own autoplay setting\n\t\t\t\tif( typeof autoplay !== 'boolean' ) {\n\t\t\t\t\tautoplay = el.hasAttribute( 'data-autoplay' ) || !!closest( el, '.slide-background' );\n\t\t\t\t}\n\n\t\t\t\tif( autoplay && typeof el.play === 'function' ) {\n\n\t\t\t\t\t// If the media is ready, start playback\n\t\t\t\t\tif( el.readyState > 1 ) {\n\t\t\t\t\t\tthis.startEmbeddedMedia( { target: el } );\n\t\t\t\t\t}\n\t\t\t\t\t// Mobile devices never fire a loaded event so instead\n\t\t\t\t\t// of waiting, we initiate playback\n\t\t\t\t\telse if( isMobile ) {\n\t\t\t\t\t\tlet promise = el.play();\n\n\t\t\t\t\t\t// If autoplay does not work, ensure that the controls are visible so\n\t\t\t\t\t\t// that the viewer can start the media on their own\n\t\t\t\t\t\tif( promise && typeof promise.catch === 'function' && el.controls === false ) {\n\t\t\t\t\t\t\tpromise.catch( () => {\n\t\t\t\t\t\t\t\tel.controls = true;\n\n\t\t\t\t\t\t\t\t// Once the video does start playing, hide the controls again\n\t\t\t\t\t\t\t\tel.addEventListener( 'play', () => {\n\t\t\t\t\t\t\t\t\tel.controls = false;\n\t\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\t// If the media isn't loaded, wait before playing\n\t\t\t\t\telse {\n\t\t\t\t\t\tel.removeEventListener( 'loadeddata', this.startEmbeddedMedia ); // remove first to avoid dupes\n\t\t\t\t\t\tel.addEventListener( 'loadeddata', this.startEmbeddedMedia );\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Normal iframes\n\t\t\tqueryAll( element, 'iframe[src]' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tthis.startEmbeddedIframe( { target: el } );\n\t\t\t} );\n\n\t\t\t// Lazy loading iframes\n\t\t\tqueryAll( element, 'iframe[data-src]' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tif( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {\n\t\t\t\t\tel.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes\n\t\t\t\t\tel.addEventListener( 'load', this.startEmbeddedIframe );\n\t\t\t\t\tel.setAttribute( 'src', el.getAttribute( 'data-src' ) );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Starts playing an embedded video/audio element after\n\t * it has finished loading.\n\t *\n\t * @param {object} event\n\t */\n\tstartEmbeddedMedia( event ) {\n\n\t\tlet isAttachedToDOM = !!closest( event.target, 'html' ),\n\t\t\tisVisible  \t\t= !!closest( event.target, '.present' );\n\n\t\tif( isAttachedToDOM && isVisible ) {\n\t\t\tevent.target.currentTime = 0;\n\t\t\tevent.target.play();\n\t\t}\n\n\t\tevent.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );\n\n\t}\n\n\t/**\n\t * \"Starts\" the content of an embedded iframe using the\n\t * postMessage API.\n\t *\n\t * @param {object} event\n\t */\n\tstartEmbeddedIframe( event ) {\n\n\t\tlet iframe = event.target;\n\n\t\tif( iframe && iframe.contentWindow ) {\n\n\t\t\tlet isAttachedToDOM = !!closest( event.target, 'html' ),\n\t\t\t\tisVisible  \t\t= !!closest( event.target, '.present' );\n\n\t\t\tif( isAttachedToDOM && isVisible ) {\n\n\t\t\t\t// Prefer an explicit global autoplay setting\n\t\t\t\tlet autoplay = this.Reveal.getConfig().autoPlayMedia;\n\n\t\t\t\t// If no global setting is available, fall back on the element's\n\t\t\t\t// own autoplay setting\n\t\t\t\tif( typeof autoplay !== 'boolean' ) {\n\t\t\t\t\tautoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closest( iframe, '.slide-background' );\n\t\t\t\t}\n\n\t\t\t\t// YouTube postMessage API\n\t\t\t\tif( /youtube\\.com\\/embed\\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {\n\t\t\t\t\tiframe.contentWindow.postMessage( '{\"event\":\"command\",\"func\":\"playVideo\",\"args\":\"\"}', '*' );\n\t\t\t\t}\n\t\t\t\t// Vimeo postMessage API\n\t\t\t\telse if( /player\\.vimeo\\.com\\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {\n\t\t\t\t\tiframe.contentWindow.postMessage( '{\"method\":\"play\"}', '*' );\n\t\t\t\t}\n\t\t\t\t// Generic postMessage API\n\t\t\t\telse {\n\t\t\t\t\tiframe.contentWindow.postMessage( 'slide:start', '*' );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Stop playback of any embedded content inside of\n\t * the targeted slide.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tstopEmbeddedContent( element, options = {} ) {\n\n\t\toptions = extend( {\n\t\t\t// Defaults\n\t\t\tunloadIframes: true\n\t\t}, options );\n\n\t\tif( element && element.parentNode ) {\n\t\t\t// HTML5 media elements\n\t\t\tqueryAll( element, 'video, audio' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {\n\t\t\t\t\tel.setAttribute('data-paused-by-reveal', '');\n\t\t\t\t\tel.pause();\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Generic postMessage API for non-lazy loaded iframes\n\t\t\tqueryAll( element, 'iframe' ).forEach( el => {\n\t\t\t\tif( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );\n\t\t\t\tel.removeEventListener( 'load', this.startEmbeddedIframe );\n\t\t\t});\n\n\t\t\t// YouTube postMessage API\n\t\t\tqueryAll( element, 'iframe[src*=\"youtube.com/embed/\"]' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {\n\t\t\t\t\tel.contentWindow.postMessage( '{\"event\":\"command\",\"func\":\"pauseVideo\",\"args\":\"\"}', '*' );\n\t\t\t\t}\n\t\t\t});\n\n\t\t\t// Vimeo postMessage API\n\t\t\tqueryAll( element, 'iframe[src*=\"player.vimeo.com/\"]' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {\n\t\t\t\t\tel.contentWindow.postMessage( '{\"method\":\"pause\"}', '*' );\n\t\t\t\t}\n\t\t\t});\n\n\t\t\tif( options.unloadIframes === true ) {\n\t\t\t\t// Unload lazy-loaded iframes\n\t\t\t\tqueryAll( element, 'iframe[data-src]' ).forEach( el => {\n\t\t\t\t\t// Only removing the src doesn't actually unload the frame\n\t\t\t\t\t// in all browsers (Firefox) so we set it to blank first\n\t\t\t\t\tel.setAttribute( 'src', 'about:blank' );\n\t\t\t\t\tel.removeAttribute( 'src' );\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t}\n\n}\n","/**\n * Handles the display of reveal.js' optional slide number.\n */\nexport default class SlideNumber {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'slide-number';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tlet slideNumberDisplay = 'none';\n\t\tif( config.slideNumber && !this.Reveal.isPrintingPDF() ) {\n\t\t\tif( config.showSlideNumber === 'all' ) {\n\t\t\t\tslideNumberDisplay = 'block';\n\t\t\t}\n\t\t\telse if( config.showSlideNumber === 'speaker' && this.Reveal.isSpeakerNotes() ) {\n\t\t\t\tslideNumberDisplay = 'block';\n\t\t\t}\n\t\t}\n\n\t\tthis.element.style.display = slideNumberDisplay;\n\n\t}\n\n\t/**\n\t * Updates the slide number to match the current slide.\n\t */\n\tupdate() {\n\n\t\t// Update slide number if enabled\n\t\tif( this.Reveal.getConfig().slideNumber && this.element ) {\n\t\t\tthis.element.innerHTML = this.getSlideNumber();\n\t\t}\n\n\t}\n\n\t/**\n\t * Returns the HTML string corresponding to the current slide\n\t * number, including formatting.\n\t */\n\tgetSlideNumber( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\t\tlet value;\n\t\tlet format = 'h.v';\n\n\t\tif ( typeof config.slideNumber === 'function' ) {\n\t\t\tvalue = config.slideNumber( slide );\n\t\t} else {\n\t\t\t// Check if a custom number format is available\n\t\t\tif( typeof config.slideNumber === 'string' ) {\n\t\t\t\tformat = config.slideNumber;\n\t\t\t}\n\n\t\t\t// If there are ONLY vertical slides in this deck, always use\n\t\t\t// a flattened slide number\n\t\t\tif( !/c/.test( format ) && this.Reveal.getHorizontalSlides().length === 1 ) {\n\t\t\t\tformat = 'c';\n\t\t\t}\n\n\t\t\t// Offset the current slide number by 1 to make it 1-indexed\n\t\t\tlet horizontalOffset = slide && slide.dataset.visibility === 'uncounted' ? 0 : 1;\n\n\t\t\tvalue = [];\n\t\t\tswitch( format ) {\n\t\t\t\tcase 'c':\n\t\t\t\t\tvalue.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset );\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'c/t':\n\t\t\t\t\tvalue.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset, '/', this.Reveal.getTotalSlides() );\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tlet indices = this.Reveal.getIndices( slide );\n\t\t\t\t\tvalue.push( indices.h + horizontalOffset );\n\t\t\t\t\tlet sep = format === 'h/v' ? '/' : '.';\n\t\t\t\t\tif( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );\n\t\t\t}\n\t\t}\n\n\t\tlet url = '#' + this.Reveal.location.getHash( slide );\n\t\treturn this.formatNumber( value[0], value[1], value[2], url );\n\n\t}\n\n\t/**\n\t * Applies HTML formatting to a slide number before it's\n\t * written to the DOM.\n\t *\n\t * @param {number} a Current slide\n\t * @param {string} delimiter Character to separate slide numbers\n\t * @param {(number|*)} b Total slides\n\t * @param {HTMLElement} [url='#'+locationHash()] The url to link to\n\t * @return {string} HTML string fragment\n\t */\n\tformatNumber( a, delimiter, b, url = '#' + this.Reveal.location.getHash() ) {\n\n\t\tif( typeof b === 'number' && !isNaN( b ) ) {\n\t\t\treturn  `<a href=\"${url}\">\n\t\t\t\t\t<span class=\"slide-number-a\">${a}</span>\n\t\t\t\t\t<span class=\"slide-number-delimiter\">${delimiter}</span>\n\t\t\t\t\t<span class=\"slide-number-b\">${b}</span>\n\t\t\t\t\t</a>`;\n\t\t}\n\t\telse {\n\t\t\treturn `<a href=\"${url}\">\n\t\t\t\t\t<span class=\"slide-number-a\">${a}</span>\n\t\t\t\t\t</a>`;\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","'use strict';\nvar $ = require('../internals/export');\nvar isObject = require('../internals/is-object');\nvar isArray = require('../internals/is-array');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\nvar toLength = require('../internals/to-length');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar createProperty = require('../internals/create-property');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('slice');\n\nvar SPECIES = wellKnownSymbol('species');\nvar nativeSlice = [].slice;\nvar max = Math.max;\n\n// `Array.prototype.slice` method\n// https://tc39.es/ecma262/#sec-array.prototype.slice\n// fallback for not array-like ES3 strings and DOM objects\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {\n  slice: function slice(start, end) {\n    var O = toIndexedObject(this);\n    var length = toLength(O.length);\n    var k = toAbsoluteIndex(start, length);\n    var fin = toAbsoluteIndex(end === undefined ? length : end, length);\n    // inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible\n    var Constructor, result, n;\n    if (isArray(O)) {\n      Constructor = O.constructor;\n      // cross-realm fallback\n      if (typeof Constructor == 'function' && (Constructor === Array || isArray(Constructor.prototype))) {\n        Constructor = undefined;\n      } else if (isObject(Constructor)) {\n        Constructor = Constructor[SPECIES];\n        if (Constructor === null) Constructor = undefined;\n      }\n      if (Constructor === Array || Constructor === undefined) {\n        return nativeSlice.call(O, k, fin);\n      }\n    }\n    result = new (Constructor === undefined ? Array : Constructor)(max(fin - k, 0));\n    for (n = 0; k < fin; k++, n++) if (k in O) createProperty(result, n, O[k]);\n    result.length = n;\n    return result;\n  }\n});\n","/**\n * Converts various color input formats to an {r:0,g:0,b:0} object.\n *\n * @param {string} color The string representation of a color\n * @example\n * colorToRgb('#000');\n * @example\n * colorToRgb('#000000');\n * @example\n * colorToRgb('rgb(0,0,0)');\n * @example\n * colorToRgb('rgba(0,0,0)');\n *\n * @return {{r: number, g: number, b: number, [a]: number}|null}\n */\nexport const colorToRgb = ( color ) => {\n\n\tlet hex3 = color.match( /^#([0-9a-f]{3})$/i );\n\tif( hex3 && hex3[1] ) {\n\t\thex3 = hex3[1];\n\t\treturn {\n\t\t\tr: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,\n\t\t\tg: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,\n\t\t\tb: parseInt( hex3.charAt( 2 ), 16 ) * 0x11\n\t\t};\n\t}\n\n\tlet hex6 = color.match( /^#([0-9a-f]{6})$/i );\n\tif( hex6 && hex6[1] ) {\n\t\thex6 = hex6[1];\n\t\treturn {\n\t\t\tr: parseInt( hex6.slice( 0, 2 ), 16 ),\n\t\t\tg: parseInt( hex6.slice( 2, 4 ), 16 ),\n\t\t\tb: parseInt( hex6.slice( 4, 6 ), 16 )\n\t\t};\n\t}\n\n\tlet rgb = color.match( /^rgb\\s*\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\)$/i );\n\tif( rgb ) {\n\t\treturn {\n\t\t\tr: parseInt( rgb[1], 10 ),\n\t\t\tg: parseInt( rgb[2], 10 ),\n\t\t\tb: parseInt( rgb[3], 10 )\n\t\t};\n\t}\n\n\tlet rgba = color.match( /^rgba\\s*\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\,\\s*([\\d]+|[\\d]*.[\\d]+)\\s*\\)$/i );\n\tif( rgba ) {\n\t\treturn {\n\t\t\tr: parseInt( rgba[1], 10 ),\n\t\t\tg: parseInt( rgba[2], 10 ),\n\t\t\tb: parseInt( rgba[3], 10 ),\n\t\t\ta: parseFloat( rgba[4] )\n\t\t};\n\t}\n\n\treturn null;\n\n}\n\n/**\n * Calculates brightness on a scale of 0-255.\n *\n * @param {string} color See colorToRgb for supported formats.\n * @see {@link colorToRgb}\n */\nexport const colorBrightness = ( color ) => {\n\n\tif( typeof color === 'string' ) color = colorToRgb( color );\n\n\tif( color ) {\n\t\treturn ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;\n\t}\n\n\treturn null;\n\n}","import { queryAll } from '../utils/util.js'\nimport { colorToRgb, colorBrightness } from '../utils/color.js'\n\n/**\n * Creates and updates slide backgrounds.\n */\nexport default class Backgrounds {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'backgrounds';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Creates the slide background elements and appends them\n\t * to the background container. One element is created per\n\t * slide no matter if the given slide has visible background.\n\t */\n\tcreate() {\n\n\t\t// Clear prior backgrounds\n\t\tthis.element.innerHTML = '';\n\t\tthis.element.classList.add( 'no-transition' );\n\n\t\t// Iterate over all horizontal slides\n\t\tthis.Reveal.getHorizontalSlides().forEach( slideh => {\n\n\t\t\tlet backgroundStack = this.createBackground( slideh, this.element );\n\n\t\t\t// Iterate over all vertical slides\n\t\t\tqueryAll( slideh, 'section' ).forEach( slidev => {\n\n\t\t\t\tthis.createBackground( slidev, backgroundStack );\n\n\t\t\t\tbackgroundStack.classList.add( 'stack' );\n\n\t\t\t} );\n\n\t\t} );\n\n\t\t// Add parallax background if specified\n\t\tif( this.Reveal.getConfig().parallaxBackgroundImage ) {\n\n\t\t\tthis.element.style.backgroundImage = 'url(\"' + this.Reveal.getConfig().parallaxBackgroundImage + '\")';\n\t\t\tthis.element.style.backgroundSize = this.Reveal.getConfig().parallaxBackgroundSize;\n\t\t\tthis.element.style.backgroundRepeat = this.Reveal.getConfig().parallaxBackgroundRepeat;\n\t\t\tthis.element.style.backgroundPosition = this.Reveal.getConfig().parallaxBackgroundPosition;\n\n\t\t\t// Make sure the below properties are set on the element - these properties are\n\t\t\t// needed for proper transitions to be set on the element via CSS. To remove\n\t\t\t// annoying background slide-in effect when the presentation starts, apply\n\t\t\t// these properties after short time delay\n\t\t\tsetTimeout( () => {\n\t\t\t\tthis.Reveal.getRevealElement().classList.add( 'has-parallax-background' );\n\t\t\t}, 1 );\n\n\t\t}\n\t\telse {\n\n\t\t\tthis.element.style.backgroundImage = '';\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'has-parallax-background' );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Creates a background for the given slide.\n\t *\n\t * @param {HTMLElement} slide\n\t * @param {HTMLElement} container The element that the background\n\t * should be appended to\n\t * @return {HTMLElement} New background div\n\t */\n\tcreateBackground( slide, container ) {\n\n\t\t// Main slide background element\n\t\tlet element = document.createElement( 'div' );\n\t\telement.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );\n\n\t\t// Inner background element that wraps images/videos/iframes\n\t\tlet contentElement = document.createElement( 'div' );\n\t\tcontentElement.className = 'slide-background-content';\n\n\t\telement.appendChild( contentElement );\n\t\tcontainer.appendChild( element );\n\n\t\tslide.slideBackgroundElement = element;\n\t\tslide.slideBackgroundContentElement = contentElement;\n\n\t\t// Syncs the background to reflect all current background settings\n\t\tthis.sync( slide );\n\n\t\treturn element;\n\n\t}\n\n\t/**\n\t * Renders all of the visual properties of a slide background\n\t * based on the various background attributes.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tsync( slide ) {\n\n\t\tconst element = slide.slideBackgroundElement,\n\t\t\tcontentElement = slide.slideBackgroundContentElement;\n\n\t\tconst data = {\n\t\t\tbackground: slide.getAttribute( 'data-background' ),\n\t\t\tbackgroundSize: slide.getAttribute( 'data-background-size' ),\n\t\t\tbackgroundImage: slide.getAttribute( 'data-background-image' ),\n\t\t\tbackgroundVideo: slide.getAttribute( 'data-background-video' ),\n\t\t\tbackgroundIframe: slide.getAttribute( 'data-background-iframe' ),\n\t\t\tbackgroundColor: slide.getAttribute( 'data-background-color' ),\n\t\t\tbackgroundGradient: slide.getAttribute( 'data-background-gradient' ),\n\t\t\tbackgroundRepeat: slide.getAttribute( 'data-background-repeat' ),\n\t\t\tbackgroundPosition: slide.getAttribute( 'data-background-position' ),\n\t\t\tbackgroundTransition: slide.getAttribute( 'data-background-transition' ),\n\t\t\tbackgroundOpacity: slide.getAttribute( 'data-background-opacity' ),\n\t\t};\n\n\t\tconst dataPreload = slide.hasAttribute( 'data-preload' );\n\n\t\t// Reset the prior background state in case this is not the\n\t\t// initial sync\n\t\tslide.classList.remove( 'has-dark-background' );\n\t\tslide.classList.remove( 'has-light-background' );\n\n\t\telement.removeAttribute( 'data-loaded' );\n\t\telement.removeAttribute( 'data-background-hash' );\n\t\telement.removeAttribute( 'data-background-size' );\n\t\telement.removeAttribute( 'data-background-transition' );\n\t\telement.style.backgroundColor = '';\n\n\t\tcontentElement.style.backgroundSize = '';\n\t\tcontentElement.style.backgroundRepeat = '';\n\t\tcontentElement.style.backgroundPosition = '';\n\t\tcontentElement.style.backgroundImage = '';\n\t\tcontentElement.style.opacity = '';\n\t\tcontentElement.innerHTML = '';\n\n\t\tif( data.background ) {\n\t\t\t// Auto-wrap image urls in url(...)\n\t\t\tif( /^(http|file|\\/\\/)/gi.test( data.background ) || /\\.(svg|png|jpg|jpeg|gif|bmp|webp)([?#\\s]|$)/gi.test( data.background ) ) {\n\t\t\t\tslide.setAttribute( 'data-background-image', data.background );\n\t\t\t}\n\t\t\telse {\n\t\t\t\telement.style.background = data.background;\n\t\t\t}\n\t\t}\n\n\t\t// Create a hash for this combination of background settings.\n\t\t// This is used to determine when two slide backgrounds are\n\t\t// the same.\n\t\tif( data.background || data.backgroundColor || data.backgroundGradient || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {\n\t\t\telement.setAttribute( 'data-background-hash', data.background +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundSize +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundImage +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundVideo +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundIframe +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundColor +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundGradient +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundRepeat +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundPosition +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundTransition +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundOpacity );\n\t\t}\n\n\t\t// Additional and optional background properties\n\t\tif( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );\n\t\tif( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;\n\t\tif( data.backgroundGradient ) element.style.backgroundImage = data.backgroundGradient;\n\t\tif( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );\n\n\t\tif( dataPreload ) element.setAttribute( 'data-preload', '' );\n\n\t\t// Background image options are set on the content wrapper\n\t\tif( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;\n\t\tif( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;\n\t\tif( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;\n\t\tif( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;\n\n\t\t// If this slide has a background color, we add a class that\n\t\t// signals if it is light or dark. If the slide has no background\n\t\t// color, no class will be added\n\t\tlet contrastColor = data.backgroundColor;\n\n\t\t// If no bg color was found, or it cannot be converted by colorToRgb, check the computed background\n\t\tif( !contrastColor || !colorToRgb( contrastColor ) ) {\n\t\t\tlet computedBackgroundStyle = window.getComputedStyle( element );\n\t\t\tif( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {\n\t\t\t\tcontrastColor = computedBackgroundStyle.backgroundColor;\n\t\t\t}\n\t\t}\n\n\t\tif( contrastColor ) {\n\t\t\tconst rgb = colorToRgb( contrastColor );\n\n\t\t\t// Ignore fully transparent backgrounds. Some browsers return\n\t\t\t// rgba(0,0,0,0) when reading the computed background color of\n\t\t\t// an element with no background\n\t\t\tif( rgb && rgb.a !== 0 ) {\n\t\t\t\tif( colorBrightness( contrastColor ) < 128 ) {\n\t\t\t\t\tslide.classList.add( 'has-dark-background' );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tslide.classList.add( 'has-light-background' );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the background elements to reflect the current\n\t * slide.\n\t *\n\t * @param {boolean} includeAll If true, the backgrounds of\n\t * all vertical slides (not just the present) will be updated.\n\t */\n\tupdate( includeAll = false ) {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tlet indices = this.Reveal.getIndices();\n\n\t\tlet currentBackground = null;\n\n\t\t// Reverse past/future classes when in RTL mode\n\t\tlet horizontalPast = this.Reveal.getConfig().rtl ? 'future' : 'past',\n\t\t\thorizontalFuture = this.Reveal.getConfig().rtl ? 'past' : 'future';\n\n\t\t// Update the classes of all backgrounds to match the\n\t\t// states of their slides (past/present/future)\n\t\tArray.from( this.element.childNodes ).forEach( ( backgroundh, h ) => {\n\n\t\t\tbackgroundh.classList.remove( 'past', 'present', 'future' );\n\n\t\t\tif( h < indices.h ) {\n\t\t\t\tbackgroundh.classList.add( horizontalPast );\n\t\t\t}\n\t\t\telse if ( h > indices.h ) {\n\t\t\t\tbackgroundh.classList.add( horizontalFuture );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbackgroundh.classList.add( 'present' );\n\n\t\t\t\t// Store a reference to the current background element\n\t\t\t\tcurrentBackground = backgroundh;\n\t\t\t}\n\n\t\t\tif( includeAll || h === indices.h ) {\n\t\t\t\tqueryAll( backgroundh, '.slide-background' ).forEach( ( backgroundv, v ) => {\n\n\t\t\t\t\tbackgroundv.classList.remove( 'past', 'present', 'future' );\n\n\t\t\t\t\tif( v < indices.v ) {\n\t\t\t\t\t\tbackgroundv.classList.add( 'past' );\n\t\t\t\t\t}\n\t\t\t\t\telse if ( v > indices.v ) {\n\t\t\t\t\t\tbackgroundv.classList.add( 'future' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tbackgroundv.classList.add( 'present' );\n\n\t\t\t\t\t\t// Only if this is the present horizontal and vertical slide\n\t\t\t\t\t\tif( h === indices.h ) currentBackground = backgroundv;\n\t\t\t\t\t}\n\n\t\t\t\t} );\n\t\t\t}\n\n\t\t} );\n\n\t\t// Stop content inside of previous backgrounds\n\t\tif( this.previousBackground ) {\n\n\t\t\tthis.Reveal.slideContent.stopEmbeddedContent( this.previousBackground, { unloadIframes: !this.Reveal.slideContent.shouldPreload( this.previousBackground ) } );\n\n\t\t}\n\n\t\t// Start content in the current background\n\t\tif( currentBackground ) {\n\n\t\t\tthis.Reveal.slideContent.startEmbeddedContent( currentBackground );\n\n\t\t\tlet currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );\n\t\t\tif( currentBackgroundContent ) {\n\n\t\t\t\tlet backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';\n\n\t\t\t\t// Restart GIFs (doesn't work in Firefox)\n\t\t\t\tif( /\\.gif/i.test( backgroundImageURL ) ) {\n\t\t\t\t\tcurrentBackgroundContent.style.backgroundImage = '';\n\t\t\t\t\twindow.getComputedStyle( currentBackgroundContent ).opacity;\n\t\t\t\t\tcurrentBackgroundContent.style.backgroundImage = backgroundImageURL;\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\t// Don't transition between identical backgrounds. This\n\t\t\t// prevents unwanted flicker.\n\t\t\tlet previousBackgroundHash = this.previousBackground ? this.previousBackground.getAttribute( 'data-background-hash' ) : null;\n\t\t\tlet currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );\n\t\t\tif( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== this.previousBackground ) {\n\t\t\t\tthis.element.classList.add( 'no-transition' );\n\t\t\t}\n\n\t\t\tthis.previousBackground = currentBackground;\n\n\t\t}\n\n\t\t// If there's a background brightness flag for this slide,\n\t\t// bubble it to the .reveal container\n\t\tif( currentSlide ) {\n\t\t\t[ 'has-light-background', 'has-dark-background' ].forEach( classToBubble => {\n\t\t\t\tif( currentSlide.classList.contains( classToBubble ) ) {\n\t\t\t\t\tthis.Reveal.getRevealElement().classList.add( classToBubble );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.getRevealElement().classList.remove( classToBubble );\n\t\t\t\t}\n\t\t\t}, this );\n\t\t}\n\n\t\t// Allow the first background to apply without transition\n\t\tsetTimeout( () => {\n\t\t\tthis.element.classList.remove( 'no-transition' );\n\t\t}, 1 );\n\n\t}\n\n\t/**\n\t * Updates the position of the parallax background based\n\t * on the current slide index.\n\t */\n\tupdateParallax() {\n\n\t\tlet indices = this.Reveal.getIndices();\n\n\t\tif( this.Reveal.getConfig().parallaxBackgroundImage ) {\n\n\t\t\tlet horizontalSlides = this.Reveal.getHorizontalSlides(),\n\t\t\t\tverticalSlides = this.Reveal.getVerticalSlides();\n\n\t\t\tlet backgroundSize = this.element.style.backgroundSize.split( ' ' ),\n\t\t\t\tbackgroundWidth, backgroundHeight;\n\n\t\t\tif( backgroundSize.length === 1 ) {\n\t\t\t\tbackgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbackgroundWidth = parseInt( backgroundSize[0], 10 );\n\t\t\t\tbackgroundHeight = parseInt( backgroundSize[1], 10 );\n\t\t\t}\n\n\t\t\tlet slideWidth = this.element.offsetWidth,\n\t\t\t\thorizontalSlideCount = horizontalSlides.length,\n\t\t\t\thorizontalOffsetMultiplier,\n\t\t\t\thorizontalOffset;\n\n\t\t\tif( typeof this.Reveal.getConfig().parallaxBackgroundHorizontal === 'number' ) {\n\t\t\t\thorizontalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundHorizontal;\n\t\t\t}\n\t\t\telse {\n\t\t\t\thorizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;\n\t\t\t}\n\n\t\t\thorizontalOffset = horizontalOffsetMultiplier * indices.h * -1;\n\n\t\t\tlet slideHeight = this.element.offsetHeight,\n\t\t\t\tverticalSlideCount = verticalSlides.length,\n\t\t\t\tverticalOffsetMultiplier,\n\t\t\t\tverticalOffset;\n\n\t\t\tif( typeof this.Reveal.getConfig().parallaxBackgroundVertical === 'number' ) {\n\t\t\t\tverticalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundVertical;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tverticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );\n\t\t\t}\n\n\t\t\tverticalOffset = verticalSlideCount > 0 ?  verticalOffsetMultiplier * indices.v : 0;\n\n\t\t\tthis.element.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';\n\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}\n","var $ = require('../internals/export');\nvar toObject = require('../internals/to-object');\nvar nativeKeys = require('../internals/object-keys');\nvar fails = require('../internals/fails');\n\nvar FAILS_ON_PRIMITIVES = fails(function () { nativeKeys(1); });\n\n// `Object.keys` method\n// https://tc39.es/ecma262/#sec-object.keys\n$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES }, {\n  keys: function keys(it) {\n    return nativeKeys(toObject(it));\n  }\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar $filter = require('../internals/array-iteration').filter;\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('filter');\n\n// `Array.prototype.filter` method\n// https://tc39.es/ecma262/#sec-array.prototype.filter\n// with adding support of @@species\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {\n  filter: function filter(callbackfn /* , thisArg */) {\n    return $filter(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n  }\n});\n","\nexport const SLIDES_SELECTOR = '.slides section';\nexport const HORIZONTAL_SLIDES_SELECTOR = '.slides>section';\nexport const VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section';\n\n// Methods that may not be invoked via the postMessage API\nexport const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener|showPreview/;\n\n// Regex for retrieving the fragment style from a class attribute\nexport const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;","import { queryAll, extend, createStyleSheet, matches, closest } from '../utils/util.js'\nimport { FRAGMENT_STYLE_REGEX } from '../utils/constants.js'\n\n// Counter used to generate unique IDs for auto-animated elements\nlet autoAnimateCounter = 0;\n\n/**\n * Automatically animates matching elements across\n * slides with the [data-auto-animate] attribute.\n */\nexport default class AutoAnimate {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Runs an auto-animation between the given slides.\n\t *\n\t * @param  {HTMLElement} fromSlide\n\t * @param  {HTMLElement} toSlide\n\t */\n\trun( fromSlide, toSlide ) {\n\n\t\t// Clean up after prior animations\n\t\tthis.reset();\n\n\t\tlet allSlides = this.Reveal.getSlides();\n\t\tlet toSlideIndex = allSlides.indexOf( toSlide );\n\t\tlet fromSlideIndex = allSlides.indexOf( fromSlide );\n\n\t\t// Ensure that both slides are auto-animate targets with the same data-auto-animate-id value\n\t\t// (including null if absent on both) and that data-auto-animate-restart isn't set on the\n\t\t// physically latter slide (independent of slide direction)\n\t\tif( fromSlide.hasAttribute( 'data-auto-animate' ) && toSlide.hasAttribute( 'data-auto-animate' )\n\t\t\t\t&& fromSlide.getAttribute( 'data-auto-animate-id' ) === toSlide.getAttribute( 'data-auto-animate-id' ) \n\t\t\t\t&& !( toSlideIndex > fromSlideIndex ? toSlide : fromSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {\n\n\t\t\t// Create a new auto-animate sheet\n\t\t\tthis.autoAnimateStyleSheet = this.autoAnimateStyleSheet || createStyleSheet();\n\n\t\t\tlet animationOptions = this.getAutoAnimateOptions( toSlide );\n\n\t\t\t// Set our starting state\n\t\t\tfromSlide.dataset.autoAnimate = 'pending';\n\t\t\ttoSlide.dataset.autoAnimate = 'pending';\n\n\t\t\t// Flag the navigation direction, needed for fragment buildup\n\t\t\tanimationOptions.slideDirection = toSlideIndex > fromSlideIndex ? 'forward' : 'backward';\n\n\t\t\t// If the from-slide is hidden because it has moved outside\n\t\t\t// the view distance, we need to temporarily show it while\n\t\t\t// measuring\n\t\t\tlet fromSlideIsHidden = fromSlide.style.display === 'none';\n\t\t\tif( fromSlideIsHidden ) fromSlide.style.display = this.Reveal.getConfig().display;\n\n\t\t\t// Inject our auto-animate styles for this transition\n\t\t\tlet css = this.getAutoAnimatableElements( fromSlide, toSlide ).map( elements => {\n\t\t\t\treturn this.autoAnimateElements( elements.from, elements.to, elements.options || {}, animationOptions, autoAnimateCounter++ );\n\t\t\t} );\n\n\t\t\tif( fromSlideIsHidden ) fromSlide.style.display = 'none';\n\n\t\t\t// Animate unmatched elements, if enabled\n\t\t\tif( toSlide.dataset.autoAnimateUnmatched !== 'false' && this.Reveal.getConfig().autoAnimateUnmatched === true ) {\n\n\t\t\t\t// Our default timings for unmatched elements\n\t\t\t\tlet defaultUnmatchedDuration = animationOptions.duration * 0.8,\n\t\t\t\t\tdefaultUnmatchedDelay = animationOptions.duration * 0.2;\n\n\t\t\t\tthis.getUnmatchedAutoAnimateElements( toSlide ).forEach( unmatchedElement => {\n\n\t\t\t\t\tlet unmatchedOptions = this.getAutoAnimateOptions( unmatchedElement, animationOptions );\n\t\t\t\t\tlet id = 'unmatched';\n\n\t\t\t\t\t// If there is a duration or delay set specifically for this\n\t\t\t\t\t// element our unmatched elements should adhere to those\n\t\t\t\t\tif( unmatchedOptions.duration !== animationOptions.duration || unmatchedOptions.delay !== animationOptions.delay ) {\n\t\t\t\t\t\tid = 'unmatched-' + autoAnimateCounter++;\n\t\t\t\t\t\tcss.push( `[data-auto-animate=\"running\"] [data-auto-animate-target=\"${id}\"] { transition: opacity ${unmatchedOptions.duration}s ease ${unmatchedOptions.delay}s; }` );\n\t\t\t\t\t}\n\n\t\t\t\t\tunmatchedElement.dataset.autoAnimateTarget = id;\n\n\t\t\t\t}, this );\n\n\t\t\t\t// Our default transition for unmatched elements\n\t\t\t\tcss.push( `[data-auto-animate=\"running\"] [data-auto-animate-target=\"unmatched\"] { transition: opacity ${defaultUnmatchedDuration}s ease ${defaultUnmatchedDelay}s; }` );\n\n\t\t\t}\n\n\t\t\t// Setting the whole chunk of CSS at once is the most\n\t\t\t// efficient way to do this. Using sheet.insertRule\n\t\t\t// is multiple factors slower.\n\t\t\tthis.autoAnimateStyleSheet.innerHTML = css.join( '' );\n\n\t\t\t// Start the animation next cycle\n\t\t\trequestAnimationFrame( () => {\n\t\t\t\tif( this.autoAnimateStyleSheet ) {\n\t\t\t\t\t// This forces our newly injected styles to be applied in Firefox\n\t\t\t\t\tgetComputedStyle( this.autoAnimateStyleSheet ).fontWeight;\n\n\t\t\t\t\ttoSlide.dataset.autoAnimate = 'running';\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'autoanimate',\n\t\t\t\tdata: {\n\t\t\t\t\tfromSlide,\n\t\t\t\t\ttoSlide,\n\t\t\t\t\tsheet: this.autoAnimateStyleSheet\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Rolls back all changes that we've made to the DOM so\n\t * that as part of animating.\n\t */\n\treset() {\n\n\t\t// Reset slides\n\t\tqueryAll( this.Reveal.getRevealElement(), '[data-auto-animate]:not([data-auto-animate=\"\"])' ).forEach( element => {\n\t\t\telement.dataset.autoAnimate = '';\n\t\t} );\n\n\t\t// Reset elements\n\t\tqueryAll( this.Reveal.getRevealElement(), '[data-auto-animate-target]' ).forEach( element => {\n\t\t\tdelete element.dataset.autoAnimateTarget;\n\t\t} );\n\n\t\t// Remove the animation sheet\n\t\tif( this.autoAnimateStyleSheet && this.autoAnimateStyleSheet.parentNode ) {\n\t\t\tthis.autoAnimateStyleSheet.parentNode.removeChild( this.autoAnimateStyleSheet );\n\t\t\tthis.autoAnimateStyleSheet = null;\n\t\t}\n\n\t}\n\n\t/**\n\t * Creates a FLIP animation where the `to` element starts out\n\t * in the `from` element position and animates to its original\n\t * state.\n\t *\n\t * @param {HTMLElement} from\n\t * @param {HTMLElement} to\n\t * @param {Object} elementOptions Options for this element pair\n\t * @param {Object} animationOptions Options set at the slide level\n\t * @param {String} id Unique ID that we can use to identify this\n\t * auto-animate element in the DOM\n\t */\n\tautoAnimateElements( from, to, elementOptions, animationOptions, id ) {\n\n\t\t// 'from' elements are given a data-auto-animate-target with no value,\n\t\t// 'to' elements are are given a data-auto-animate-target with an ID\n\t\tfrom.dataset.autoAnimateTarget = '';\n\t\tto.dataset.autoAnimateTarget = id;\n\n\t\t// Each element may override any of the auto-animate options\n\t\t// like transition easing, duration and delay via data-attributes\n\t\tlet options = this.getAutoAnimateOptions( to, animationOptions );\n\n\t\t// If we're using a custom element matcher the element options\n\t\t// may contain additional transition overrides\n\t\tif( typeof elementOptions.delay !== 'undefined' ) options.delay = elementOptions.delay;\n\t\tif( typeof elementOptions.duration !== 'undefined' ) options.duration = elementOptions.duration;\n\t\tif( typeof elementOptions.easing !== 'undefined' ) options.easing = elementOptions.easing;\n\n\t\tlet fromProps = this.getAutoAnimatableProperties( 'from', from, elementOptions ),\n\t\t\ttoProps = this.getAutoAnimatableProperties( 'to', to, elementOptions );\n\n\t\t// Maintain fragment visibility for matching elements when\n\t\t// we're navigating forwards, this way the viewer won't need\n\t\t// to step through the same fragments twice\n\t\tif( to.classList.contains( 'fragment' ) ) {\n\n\t\t\t// Don't auto-animate the opacity of fragments to avoid\n\t\t\t// conflicts with fragment animations\n\t\t\tdelete toProps.styles['opacity'];\n\n\t\t\tif( from.classList.contains( 'fragment' ) ) {\n\n\t\t\t\tlet fromFragmentStyle = ( from.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];\n\t\t\t\tlet toFragmentStyle = ( to.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];\n\n\t\t\t\t// Only skip the fragment if the fragment animation style\n\t\t\t\t// remains unchanged\n\t\t\t\tif( fromFragmentStyle === toFragmentStyle && animationOptions.slideDirection === 'forward' ) {\n\t\t\t\t\tto.classList.add( 'visible', 'disabled' );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t// If translation and/or scaling are enabled, css transform\n\t\t// the 'to' element so that it matches the position and size\n\t\t// of the 'from' element\n\t\tif( elementOptions.translate !== false || elementOptions.scale !== false ) {\n\n\t\t\tlet presentationScale = this.Reveal.getScale();\n\n\t\t\tlet delta = {\n\t\t\t\tx: ( fromProps.x - toProps.x ) / presentationScale,\n\t\t\t\ty: ( fromProps.y - toProps.y ) / presentationScale,\n\t\t\t\tscaleX: fromProps.width / toProps.width,\n\t\t\t\tscaleY: fromProps.height / toProps.height\n\t\t\t};\n\n\t\t\t// Limit decimal points to avoid 0.0001px blur and stutter\n\t\t\tdelta.x = Math.round( delta.x * 1000 ) / 1000;\n\t\t\tdelta.y = Math.round( delta.y * 1000 ) / 1000;\n\t\t\tdelta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;\n\t\t\tdelta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;\n\n\t\t\tlet translate = elementOptions.translate !== false && ( delta.x !== 0 || delta.y !== 0 ),\n\t\t\t\tscale = elementOptions.scale !== false && ( delta.scaleX !== 0 || delta.scaleY !== 0 );\n\n\t\t\t// No need to transform if nothing's changed\n\t\t\tif( translate || scale ) {\n\n\t\t\t\tlet transform = [];\n\n\t\t\t\tif( translate ) transform.push( `translate(${delta.x}px, ${delta.y}px)` );\n\t\t\t\tif( scale ) transform.push( `scale(${delta.scaleX}, ${delta.scaleY})` );\n\n\t\t\t\tfromProps.styles['transform'] = transform.join( ' ' );\n\t\t\t\tfromProps.styles['transform-origin'] = 'top left';\n\n\t\t\t\ttoProps.styles['transform'] = 'none';\n\n\t\t\t}\n\n\t\t}\n\n\t\t// Delete all unchanged 'to' styles\n\t\tfor( let propertyName in toProps.styles ) {\n\t\t\tconst toValue = toProps.styles[propertyName];\n\t\t\tconst fromValue = fromProps.styles[propertyName];\n\n\t\t\tif( toValue === fromValue ) {\n\t\t\t\tdelete toProps.styles[propertyName];\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// If these property values were set via a custom matcher providing\n\t\t\t\t// an explicit 'from' and/or 'to' value, we always inject those values.\n\t\t\t\tif( toValue.explicitValue === true ) {\n\t\t\t\t\ttoProps.styles[propertyName] = toValue.value;\n\t\t\t\t}\n\n\t\t\t\tif( fromValue.explicitValue === true ) {\n\t\t\t\t\tfromProps.styles[propertyName] = fromValue.value;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tlet css = '';\n\n\t\tlet toStyleProperties = Object.keys( toProps.styles );\n\n\t\t// Only create animate this element IF at least one style\n\t\t// property has changed\n\t\tif( toStyleProperties.length > 0 ) {\n\n\t\t\t// Instantly move to the 'from' state\n\t\t\tfromProps.styles['transition'] = 'none';\n\n\t\t\t// Animate towards the 'to' state\n\t\t\ttoProps.styles['transition'] = `all ${options.duration}s ${options.easing} ${options.delay}s`;\n\t\t\ttoProps.styles['transition-property'] = toStyleProperties.join( ', ' );\n\t\t\ttoProps.styles['will-change'] = toStyleProperties.join( ', ' );\n\n\t\t\t// Build up our custom CSS. We need to override inline styles\n\t\t\t// so we need to make our styles vErY IMPORTANT!1!!\n\t\t\tlet fromCSS = Object.keys( fromProps.styles ).map( propertyName => {\n\t\t\t\treturn propertyName + ': ' + fromProps.styles[propertyName] + ' !important;';\n\t\t\t} ).join( '' );\n\n\t\t\tlet toCSS = Object.keys( toProps.styles ).map( propertyName => {\n\t\t\t\treturn propertyName + ': ' + toProps.styles[propertyName] + ' !important;';\n\t\t\t} ).join( '' );\n\n\t\t\tcss = \t'[data-auto-animate-target=\"'+ id +'\"] {'+ fromCSS +'}' +\n\t\t\t\t\t'[data-auto-animate=\"running\"] [data-auto-animate-target=\"'+ id +'\"] {'+ toCSS +'}';\n\n\t\t}\n\n\t\treturn css;\n\n\t}\n\n\t/**\n\t * Returns the auto-animate options for the given element.\n\t *\n\t * @param {HTMLElement} element Element to pick up options\n\t * from, either a slide or an animation target\n\t * @param {Object} [inheritedOptions] Optional set of existing\n\t * options\n\t */\n\tgetAutoAnimateOptions( element, inheritedOptions ) {\n\n\t\tlet options = {\n\t\t\teasing: this.Reveal.getConfig().autoAnimateEasing,\n\t\t\tduration: this.Reveal.getConfig().autoAnimateDuration,\n\t\t\tdelay: 0\n\t\t};\n\n\t\toptions = extend( options, inheritedOptions );\n\n\t\t// Inherit options from parent elements\n\t\tif( element.parentNode ) {\n\t\t\tlet autoAnimatedParent = closest( element.parentNode, '[data-auto-animate-target]' );\n\t\t\tif( autoAnimatedParent ) {\n\t\t\t\toptions = this.getAutoAnimateOptions( autoAnimatedParent, options );\n\t\t\t}\n\t\t}\n\n\t\tif( element.dataset.autoAnimateEasing ) {\n\t\t\toptions.easing = element.dataset.autoAnimateEasing;\n\t\t}\n\n\t\tif( element.dataset.autoAnimateDuration ) {\n\t\t\toptions.duration = parseFloat( element.dataset.autoAnimateDuration );\n\t\t}\n\n\t\tif( element.dataset.autoAnimateDelay ) {\n\t\t\toptions.delay = parseFloat( element.dataset.autoAnimateDelay );\n\t\t}\n\n\t\treturn options;\n\n\t}\n\n\t/**\n\t * Returns an object containing all of the properties\n\t * that can be auto-animated for the given element and\n\t * their current computed values.\n\t *\n\t * @param {String} direction 'from' or 'to'\n\t */\n\tgetAutoAnimatableProperties( direction, element, elementOptions ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\tlet properties = { styles: [] };\n\n\t\t// Position and size\n\t\tif( elementOptions.translate !== false || elementOptions.scale !== false ) {\n\t\t\tlet bounds;\n\n\t\t\t// Custom auto-animate may optionally return a custom tailored\n\t\t\t// measurement function\n\t\t\tif( typeof elementOptions.measure === 'function' ) {\n\t\t\t\tbounds = elementOptions.measure( element );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif( config.center ) {\n\t\t\t\t\t// More precise, but breaks when used in combination\n\t\t\t\t\t// with zoom for scaling the deck ¯\\_(ツ)_/¯\n\t\t\t\t\tbounds = element.getBoundingClientRect();\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tlet scale = this.Reveal.getScale();\n\t\t\t\t\tbounds = {\n\t\t\t\t\t\tx: element.offsetLeft * scale,\n\t\t\t\t\t\ty: element.offsetTop * scale,\n\t\t\t\t\t\twidth: element.offsetWidth * scale,\n\t\t\t\t\t\theight: element.offsetHeight * scale\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tproperties.x = bounds.x;\n\t\t\tproperties.y = bounds.y;\n\t\t\tproperties.width = bounds.width;\n\t\t\tproperties.height = bounds.height;\n\t\t}\n\n\t\tconst computedStyles = getComputedStyle( element );\n\n\t\t// CSS styles\n\t\t( elementOptions.styles || config.autoAnimateStyles ).forEach( style => {\n\t\t\tlet value;\n\n\t\t\t// `style` is either the property name directly, or an object\n\t\t\t// definition of a style property\n\t\t\tif( typeof style === 'string' ) style = { property: style };\n\n\t\t\tif( typeof style.from !== 'undefined' && direction === 'from' ) {\n\t\t\t\tvalue = { value: style.from, explicitValue: true };\n\t\t\t}\n\t\t\telse if( typeof style.to !== 'undefined' && direction === 'to' ) {\n\t\t\t\tvalue = { value: style.to, explicitValue: true };\n\t\t\t}\n\t\t\telse {\n\t\t\t\tvalue = computedStyles[style.property];\n\t\t\t}\n\n\t\t\tif( value !== '' ) {\n\t\t\t\tproperties.styles[style.property] = value;\n\t\t\t}\n\t\t} );\n\n\t\treturn properties;\n\n\t}\n\n\t/**\n\t * Get a list of all element pairs that we can animate\n\t * between the given slides.\n\t *\n\t * @param {HTMLElement} fromSlide\n\t * @param {HTMLElement} toSlide\n\t *\n\t * @return {Array} Each value is an array where [0] is\n\t * the element we're animating from and [1] is the\n\t * element we're animating to\n\t */\n\tgetAutoAnimatableElements( fromSlide, toSlide ) {\n\n\t\tlet matcher = typeof this.Reveal.getConfig().autoAnimateMatcher === 'function' ? this.Reveal.getConfig().autoAnimateMatcher : this.getAutoAnimatePairs;\n\n\t\tlet pairs = matcher.call( this, fromSlide, toSlide );\n\n\t\tlet reserved = [];\n\n\t\t// Remove duplicate pairs\n\t\treturn pairs.filter( ( pair, index ) => {\n\t\t\tif( reserved.indexOf( pair.to ) === -1 ) {\n\t\t\t\treserved.push( pair.to );\n\t\t\t\treturn true;\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Identifies matching elements between slides.\n\t *\n\t * You can specify a custom matcher function by using\n\t * the `autoAnimateMatcher` config option.\n\t */\n\tgetAutoAnimatePairs( fromSlide, toSlide ) {\n\n\t\tlet pairs = [];\n\n\t\tconst codeNodes = 'pre';\n\t\tconst textNodes = 'h1, h2, h3, h4, h5, h6, p, li';\n\t\tconst mediaNodes = 'img, video, iframe';\n\n\t\t// Eplicit matches via data-id\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', node => {\n\t\t\treturn node.nodeName + ':::' + node.getAttribute( 'data-id' );\n\t\t} );\n\n\t\t// Text\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, textNodes, node => {\n\t\t\treturn node.nodeName + ':::' + node.innerText;\n\t\t} );\n\n\t\t// Media\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, mediaNodes, node => {\n\t\t\treturn node.nodeName + ':::' + ( node.getAttribute( 'src' ) || node.getAttribute( 'data-src' ) );\n\t\t} );\n\n\t\t// Code\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, codeNodes, node => {\n\t\t\treturn node.nodeName + ':::' + node.innerText;\n\t\t} );\n\n\t\tpairs.forEach( pair => {\n\n\t\t\t// Disable scale transformations on text nodes, we transition\n\t\t\t// each individual text property instead\n\t\t\tif( matches( pair.from, textNodes ) ) {\n\t\t\t\tpair.options = { scale: false };\n\t\t\t}\n\t\t\t// Animate individual lines of code\n\t\t\telse if( matches( pair.from, codeNodes ) ) {\n\n\t\t\t\t// Transition the code block's width and height instead of scaling\n\t\t\t\t// to prevent its content from being squished\n\t\t\t\tpair.options = { scale: false, styles: [ 'width', 'height' ] };\n\n\t\t\t\t// Lines of code\n\t\t\t\tthis.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-code', node => {\n\t\t\t\t\treturn node.textContent;\n\t\t\t\t}, {\n\t\t\t\t\tscale: false,\n\t\t\t\t\tstyles: [],\n\t\t\t\t\tmeasure: this.getLocalBoundingBox.bind( this )\n\t\t\t\t} );\n\n\t\t\t\t// Line numbers\n\t\t\t\tthis.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-line[data-line-number]', node => {\n\t\t\t\t\treturn node.getAttribute( 'data-line-number' );\n\t\t\t\t}, {\n\t\t\t\t\tscale: false,\n\t\t\t\t\tstyles: [ 'width' ],\n\t\t\t\t\tmeasure: this.getLocalBoundingBox.bind( this )\n\t\t\t\t} );\n\n\t\t\t}\n\n\t\t}, this );\n\n\t\treturn pairs;\n\n\t}\n\n\t/**\n\t * Helper method which returns a bounding box based on\n\t * the given elements offset coordinates.\n\t *\n\t * @param {HTMLElement} element\n\t * @return {Object} x, y, width, height\n\t */\n\tgetLocalBoundingBox( element ) {\n\n\t\tconst presentationScale = this.Reveal.getScale();\n\n\t\treturn {\n\t\t\tx: Math.round( ( element.offsetLeft * presentationScale ) * 100 ) / 100,\n\t\t\ty: Math.round( ( element.offsetTop * presentationScale ) * 100 ) / 100,\n\t\t\twidth: Math.round( ( element.offsetWidth * presentationScale ) * 100 ) / 100,\n\t\t\theight: Math.round( ( element.offsetHeight * presentationScale ) * 100 ) / 100\n\t\t};\n\n\t}\n\n\t/**\n\t * Finds matching elements between two slides.\n\t *\n\t * @param {Array} pairs            \tList of pairs to push matches to\n\t * @param {HTMLElement} fromScope   Scope within the from element exists\n\t * @param {HTMLElement} toScope     Scope within the to element exists\n\t * @param {String} selector         CSS selector of the element to match\n\t * @param {Function} serializer     A function that accepts an element and returns\n\t *                                  a stringified ID based on its contents\n\t * @param {Object} animationOptions Optional config options for this pair\n\t */\n\tfindAutoAnimateMatches( pairs, fromScope, toScope, selector, serializer, animationOptions ) {\n\n\t\tlet fromMatches = {};\n\t\tlet toMatches = {};\n\n\t\t[].slice.call( fromScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {\n\t\t\tconst key = serializer( element );\n\t\t\tif( typeof key === 'string' && key.length ) {\n\t\t\t\tfromMatches[key] = fromMatches[key] || [];\n\t\t\t\tfromMatches[key].push( element );\n\t\t\t}\n\t\t} );\n\n\t\t[].slice.call( toScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {\n\t\t\tconst key = serializer( element );\n\t\t\ttoMatches[key] = toMatches[key] || [];\n\t\t\ttoMatches[key].push( element );\n\n\t\t\tlet fromElement;\n\n\t\t\t// Retrieve the 'from' element\n\t\t\tif( fromMatches[key] ) {\n\t\t\t\tconst pimaryIndex = toMatches[key].length - 1;\n\t\t\t\tconst secondaryIndex = fromMatches[key].length - 1;\n\n\t\t\t\t// If there are multiple identical from elements, retrieve\n\t\t\t\t// the one at the same index as our to-element.\n\t\t\t\tif( fromMatches[key][ pimaryIndex ] ) {\n\t\t\t\t\tfromElement = fromMatches[key][ pimaryIndex ];\n\t\t\t\t\tfromMatches[key][ pimaryIndex ] = null;\n\t\t\t\t}\n\t\t\t\t// If there are no matching from-elements at the same index,\n\t\t\t\t// use the last one.\n\t\t\t\telse if( fromMatches[key][ secondaryIndex ] ) {\n\t\t\t\t\tfromElement = fromMatches[key][ secondaryIndex ];\n\t\t\t\t\tfromMatches[key][ secondaryIndex ] = null;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If we've got a matching pair, push it to the list of pairs\n\t\t\tif( fromElement ) {\n\t\t\t\tpairs.push({\n\t\t\t\t\tfrom: fromElement,\n\t\t\t\t\tto: element,\n\t\t\t\t\toptions: animationOptions\n\t\t\t\t});\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Returns a all elements within the given scope that should\n\t * be considered unmatched in an auto-animate transition. If\n\t * fading of unmatched elements is turned on, these elements\n\t * will fade when going between auto-animate slides.\n\t *\n\t * Note that parents of auto-animate targets are NOT considerd\n\t * unmatched since fading them would break the auto-animation.\n\t *\n\t * @param {HTMLElement} rootElement\n\t * @return {Array}\n\t */\n\tgetUnmatchedAutoAnimateElements( rootElement ) {\n\n\t\treturn [].slice.call( rootElement.children ).reduce( ( result, element ) => {\n\n\t\t\tconst containsAnimatedElements = element.querySelector( '[data-auto-animate-target]' );\n\n\t\t\t// The element is unmatched if\n\t\t\t// - It is not an auto-animate target\n\t\t\t// - It does not contain any auto-animate targets\n\t\t\tif( !element.hasAttribute( 'data-auto-animate-target' ) && !containsAnimatedElements ) {\n\t\t\t\tresult.push( element );\n\t\t\t}\n\n\t\t\tif( element.querySelector( '[data-auto-animate-target]' ) ) {\n\t\t\t\tresult = result.concat( this.getUnmatchedAutoAnimateElements( element ) );\n\t\t\t}\n\n\t\t\treturn result;\n\n\t\t}, [] );\n\n\t}\n\n}\n","import { extend, queryAll } from '../utils/util.js'\n\n/**\n * Handles sorting and navigation of slide fragments.\n * Fragments are elements within a slide that are\n * revealed/animated incrementally.\n */\nexport default class Fragments {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.fragments === false ) {\n\t\t\tthis.disable();\n\t\t}\n\t\telse if( oldConfig.fragments === false ) {\n\t\t\tthis.enable();\n\t\t}\n\n\t}\n\n\t/**\n\t * If fragments are disabled in the deck, they should all be\n\t * visible rather than stepped through.\n\t */\n\tdisable() {\n\n\t\tqueryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {\n\t\t\telement.classList.add( 'visible' );\n\t\t\telement.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Reverse of #disable(). Only called if fragments have\n\t * previously been disabled.\n\t */\n\tenable() {\n\n\t\tqueryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {\n\t\t\telement.classList.remove( 'visible' );\n\t\t\telement.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Returns an object describing the available fragment\n\t * directions.\n\t *\n\t * @return {{prev: boolean, next: boolean}}\n\t */\n\tavailableRoutes() {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\t\t\tlet fragments = currentSlide.querySelectorAll( '.fragment:not(.disabled)' );\n\t\t\tlet hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.disabled):not(.visible)' );\n\n\t\t\treturn {\n\t\t\t\tprev: fragments.length - hiddenFragments.length > 0,\n\t\t\t\tnext: !!hiddenFragments.length\n\t\t\t};\n\t\t}\n\t\telse {\n\t\t\treturn { prev: false, next: false };\n\t\t}\n\n\t}\n\n\t/**\n\t * Return a sorted fragments list, ordered by an increasing\n\t * \"data-fragment-index\" attribute.\n\t *\n\t * Fragments will be revealed in the order that they are returned by\n\t * this function, so you can use the index attributes to control the\n\t * order of fragment appearance.\n\t *\n\t * To maintain a sensible default fragment order, fragments are presumed\n\t * to be passed in document order. This function adds a \"fragment-index\"\n\t * attribute to each node if such an attribute is not already present,\n\t * and sets that attribute to an integer value which is the position of\n\t * the fragment within the fragments list.\n\t *\n\t * @param {object[]|*} fragments\n\t * @param {boolean} grouped If true the returned array will contain\n\t * nested arrays for all fragments with the same index\n\t * @return {object[]} sorted Sorted array of fragments\n\t */\n\tsort( fragments, grouped = false ) {\n\n\t\tfragments = Array.from( fragments );\n\n\t\tlet ordered = [],\n\t\t\tunordered = [],\n\t\t\tsorted = [];\n\n\t\t// Group ordered and unordered elements\n\t\tfragments.forEach( fragment => {\n\t\t\tif( fragment.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\tlet index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );\n\n\t\t\t\tif( !ordered[index] ) {\n\t\t\t\t\tordered[index] = [];\n\t\t\t\t}\n\n\t\t\t\tordered[index].push( fragment );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tunordered.push( [ fragment ] );\n\t\t\t}\n\t\t} );\n\n\t\t// Append fragments without explicit indices in their\n\t\t// DOM order\n\t\tordered = ordered.concat( unordered );\n\n\t\t// Manually count the index up per group to ensure there\n\t\t// are no gaps\n\t\tlet index = 0;\n\n\t\t// Push all fragments in their sorted order to an array,\n\t\t// this flattens the groups\n\t\tordered.forEach( group => {\n\t\t\tgroup.forEach( fragment => {\n\t\t\t\tsorted.push( fragment );\n\t\t\t\tfragment.setAttribute( 'data-fragment-index', index );\n\t\t\t} );\n\n\t\t\tindex ++;\n\t\t} );\n\n\t\treturn grouped === true ? ordered : sorted;\n\n\t}\n\n\t/**\n\t * Sorts and formats all of fragments in the\n\t * presentation.\n\t */\n\tsortAll() {\n\n\t\tthis.Reveal.getHorizontalSlides().forEach( horizontalSlide => {\n\n\t\t\tlet verticalSlides = queryAll( horizontalSlide, 'section' );\n\t\t\tverticalSlides.forEach( ( verticalSlide, y ) => {\n\n\t\t\t\tthis.sort( verticalSlide.querySelectorAll( '.fragment' ) );\n\n\t\t\t}, this );\n\n\t\t\tif( verticalSlides.length === 0 ) this.sort( horizontalSlide.querySelectorAll( '.fragment' ) );\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Refreshes the fragments on the current slide so that they\n\t * have the appropriate classes (.visible + .current-fragment).\n\t *\n\t * @param {number} [index] The index of the current fragment\n\t * @param {array} [fragments] Array containing all fragments\n\t * in the current slide\n\t *\n\t * @return {{shown: array, hidden: array}}\n\t */\n\tupdate( index, fragments ) {\n\n\t\tlet changedFragments = {\n\t\t\tshown: [],\n\t\t\thidden: []\n\t\t};\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\n\t\t\tfragments = fragments || this.sort( currentSlide.querySelectorAll( '.fragment' ) );\n\n\t\t\tif( fragments.length ) {\n\n\t\t\t\tlet maxIndex = 0;\n\n\t\t\t\tif( typeof index !== 'number' ) {\n\t\t\t\t\tlet currentFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();\n\t\t\t\t\tif( currentFragment ) {\n\t\t\t\t\t\tindex = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tArray.from( fragments ).forEach( ( el, i ) => {\n\n\t\t\t\t\tif( el.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\t\t\ti = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );\n\t\t\t\t\t}\n\n\t\t\t\t\tmaxIndex = Math.max( maxIndex, i );\n\n\t\t\t\t\t// Visible fragments\n\t\t\t\t\tif( i <= index ) {\n\t\t\t\t\t\tlet wasVisible = el.classList.contains( 'visible' )\n\t\t\t\t\t\tel.classList.add( 'visible' );\n\t\t\t\t\t\tel.classList.remove( 'current-fragment' );\n\n\t\t\t\t\t\tif( i === index ) {\n\t\t\t\t\t\t\t// Announce the fragments one by one to the Screen Reader\n\t\t\t\t\t\t\tthis.Reveal.announceStatus( this.Reveal.getStatusText( el ) );\n\n\t\t\t\t\t\t\tel.classList.add( 'current-fragment' );\n\t\t\t\t\t\t\tthis.Reveal.slideContent.startEmbeddedContent( el );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tif( !wasVisible ) {\n\t\t\t\t\t\t\tchangedFragments.shown.push( el )\n\t\t\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\t\t\ttarget: el,\n\t\t\t\t\t\t\t\ttype: 'visible',\n\t\t\t\t\t\t\t\tbubbles: false\n\t\t\t\t\t\t\t});\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\t// Hidden fragments\n\t\t\t\t\telse {\n\t\t\t\t\t\tlet wasVisible = el.classList.contains( 'visible' )\n\t\t\t\t\t\tel.classList.remove( 'visible' );\n\t\t\t\t\t\tel.classList.remove( 'current-fragment' );\n\n\t\t\t\t\t\tif( wasVisible ) {\n\t\t\t\t\t\t\tthis.Reveal.slideContent.stopEmbeddedContent( el );\n\t\t\t\t\t\t\tchangedFragments.hidden.push( el );\n\t\t\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\t\t\ttarget: el,\n\t\t\t\t\t\t\t\ttype: 'hidden',\n\t\t\t\t\t\t\t\tbubbles: false\n\t\t\t\t\t\t\t});\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t} );\n\n\t\t\t\t// Write the current fragment index to the slide <section>.\n\t\t\t\t// This can be used by end users to apply styles based on\n\t\t\t\t// the current fragment index.\n\t\t\t\tindex = typeof index === 'number' ? index : -1;\n\t\t\t\tindex = Math.max( Math.min( index, maxIndex ), -1 );\n\t\t\t\tcurrentSlide.setAttribute( 'data-fragment', index );\n\n\t\t\t}\n\n\t\t}\n\n\t\treturn changedFragments;\n\n\t}\n\n\t/**\n\t * Formats the fragments on the given slide so that they have\n\t * valid indices. Call this if fragments are changed in the DOM\n\t * after reveal.js has already initialized.\n\t *\n\t * @param {HTMLElement} slide\n\t * @return {Array} a list of the HTML fragments that were synced\n\t */\n\tsync( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\treturn this.sort( slide.querySelectorAll( '.fragment' ) );\n\n\t}\n\n\t/**\n\t * Navigate to the specified slide fragment.\n\t *\n\t * @param {?number} index The index of the fragment that\n\t * should be shown, -1 means all are invisible\n\t * @param {number} offset Integer offset to apply to the\n\t * fragment index\n\t *\n\t * @return {boolean} true if a change was made in any\n\t * fragments visibility as part of this call\n\t */\n\tgoto( index, offset = 0 ) {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\n\t\t\tlet fragments = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled)' ) );\n\t\t\tif( fragments.length ) {\n\n\t\t\t\t// If no index is specified, find the current\n\t\t\t\tif( typeof index !== 'number' ) {\n\t\t\t\t\tlet lastVisibleFragment = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled).visible' ) ).pop();\n\n\t\t\t\t\tif( lastVisibleFragment ) {\n\t\t\t\t\t\tindex = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tindex = -1;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Apply the offset if there is one\n\t\t\t\tindex += offset;\n\n\t\t\t\tlet changedFragments = this.update( index, fragments );\n\n\t\t\t\tif( changedFragments.hidden.length ) {\n\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\ttype: 'fragmenthidden',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\tfragment: changedFragments.hidden[0],\n\t\t\t\t\t\t\tfragments: changedFragments.hidden\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tif( changedFragments.shown.length ) {\n\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\ttype: 'fragmentshown',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\tfragment: changedFragments.shown[0],\n\t\t\t\t\t\t\tfragments: changedFragments.shown\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tthis.Reveal.controls.update();\n\t\t\t\tthis.Reveal.progress.update();\n\n\t\t\t\tif( this.Reveal.getConfig().fragmentInURL ) {\n\t\t\t\t\tthis.Reveal.location.writeURL();\n\t\t\t\t}\n\n\t\t\t\treturn !!( changedFragments.shown.length || changedFragments.hidden.length );\n\n\t\t\t}\n\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Navigate to the next slide fragment.\n\t *\n\t * @return {boolean} true if there was a next fragment,\n\t * false otherwise\n\t */\n\tnext() {\n\n\t\treturn this.goto( null, 1 );\n\n\t}\n\n\t/**\n\t * Navigate to the previous slide fragment.\n\t *\n\t * @return {boolean} true if there was a previous fragment,\n\t * false otherwise\n\t */\n\tprev() {\n\n\t\treturn this.goto( null, -1 );\n\n\t}\n\n}","import { SLIDES_SELECTOR } from '../utils/constants.js'\nimport { extend, queryAll, transformElement } from '../utils/util.js'\n\n/**\n * Handles all logic related to the overview mode\n * (birds-eye view of all slides).\n */\nexport default class Overview {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.active = false;\n\n\t\tthis.onSlideClicked = this.onSlideClicked.bind( this );\n\n\t}\n\n\t/**\n\t * Displays the overview of slides (quick nav) by scaling\n\t * down and arranging all slide elements.\n\t */\n\tactivate() {\n\n\t\t// Only proceed if enabled in config\n\t\tif( this.Reveal.getConfig().overview && !this.isActive() ) {\n\n\t\t\tthis.active = true;\n\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'overview' );\n\n\t\t\t// Don't auto-slide while in overview mode\n\t\t\tthis.Reveal.cancelAutoSlide();\n\n\t\t\t// Move the backgrounds element into the slide container to\n\t\t\t// that the same scaling is applied\n\t\t\tthis.Reveal.getSlidesElement().appendChild( this.Reveal.getBackgroundsElement() );\n\n\t\t\t// Clicking on an overview slide navigates to it\n\t\t\tqueryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {\n\t\t\t\tif( !slide.classList.contains( 'stack' ) ) {\n\t\t\t\t\tslide.addEventListener( 'click', this.onSlideClicked, true );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Calculate slide sizes\n\t\t\tconst margin = 70;\n\t\t\tconst slideSize = this.Reveal.getComputedSlideSize();\n\t\t\tthis.overviewSlideWidth = slideSize.width + margin;\n\t\t\tthis.overviewSlideHeight = slideSize.height + margin;\n\n\t\t\t// Reverse in RTL mode\n\t\t\tif( this.Reveal.getConfig().rtl ) {\n\t\t\t\tthis.overviewSlideWidth = -this.overviewSlideWidth;\n\t\t\t}\n\n\t\t\tthis.Reveal.updateSlidesVisibility();\n\n\t\t\tthis.layout();\n\t\t\tthis.update();\n\n\t\t\tthis.Reveal.layout();\n\n\t\t\tconst indices = this.Reveal.getIndices();\n\n\t\t\t// Notify observers of the overview showing\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'overviewshown',\n\t\t\t\tdata: {\n\t\t\t\t\t'indexh': indices.h,\n\t\t\t\t\t'indexv': indices.v,\n\t\t\t\t\t'currentSlide': this.Reveal.getCurrentSlide()\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Uses CSS transforms to position all slides in a grid for\n\t * display inside of the overview mode.\n\t */\n\tlayout() {\n\n\t\t// Layout slides\n\t\tthis.Reveal.getHorizontalSlides().forEach( ( hslide, h ) => {\n\t\t\thslide.setAttribute( 'data-index-h', h );\n\t\t\ttransformElement( hslide, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );\n\n\t\t\tif( hslide.classList.contains( 'stack' ) ) {\n\n\t\t\t\tqueryAll( hslide, 'section' ).forEach( ( vslide, v ) => {\n\t\t\t\t\tvslide.setAttribute( 'data-index-h', h );\n\t\t\t\t\tvslide.setAttribute( 'data-index-v', v );\n\n\t\t\t\t\ttransformElement( vslide, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );\n\t\t\t\t} );\n\n\t\t\t}\n\t\t} );\n\n\t\t// Layout slide backgrounds\n\t\tArray.from( this.Reveal.getBackgroundsElement().childNodes ).forEach( ( hbackground, h ) => {\n\t\t\ttransformElement( hbackground, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );\n\n\t\t\tqueryAll( hbackground, '.slide-background' ).forEach( ( vbackground, v ) => {\n\t\t\t\ttransformElement( vbackground, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );\n\t\t\t} );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Moves the overview viewport to the current slides.\n\t * Called each time the current slide changes.\n\t */\n\tupdate() {\n\n\t\tconst vmin = Math.min( window.innerWidth, window.innerHeight );\n\t\tconst scale = Math.max( vmin / 5, 150 ) / vmin;\n\t\tconst indices = this.Reveal.getIndices();\n\n\t\tthis.Reveal.transformSlides( {\n\t\t\toverview: [\n\t\t\t\t'scale('+ scale +')',\n\t\t\t\t'translateX('+ ( -indices.h * this.overviewSlideWidth ) +'px)',\n\t\t\t\t'translateY('+ ( -indices.v * this.overviewSlideHeight ) +'px)'\n\t\t\t].join( ' ' )\n\t\t} );\n\n\t}\n\n\t/**\n\t * Exits the slide overview and enters the currently\n\t * active slide.\n\t */\n\tdeactivate() {\n\n\t\t// Only proceed if enabled in config\n\t\tif( this.Reveal.getConfig().overview ) {\n\n\t\t\tthis.active = false;\n\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'overview' );\n\n\t\t\t// Temporarily add a class so that transitions can do different things\n\t\t\t// depending on whether they are exiting/entering overview, or just\n\t\t\t// moving from slide to slide\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'overview-deactivating' );\n\n\t\t\tsetTimeout( () => {\n\t\t\t\tthis.Reveal.getRevealElement().classList.remove( 'overview-deactivating' );\n\t\t\t}, 1 );\n\n\t\t\t// Move the background element back out\n\t\t\tthis.Reveal.getRevealElement().appendChild( this.Reveal.getBackgroundsElement() );\n\n\t\t\t// Clean up changes made to slides\n\t\t\tqueryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {\n\t\t\t\ttransformElement( slide, '' );\n\n\t\t\t\tslide.removeEventListener( 'click', this.onSlideClicked, true );\n\t\t\t} );\n\n\t\t\t// Clean up changes made to backgrounds\n\t\t\tqueryAll( this.Reveal.getBackgroundsElement(), '.slide-background' ).forEach( background => {\n\t\t\t\ttransformElement( background, '' );\n\t\t\t} );\n\n\t\t\tthis.Reveal.transformSlides( { overview: '' } );\n\n\t\t\tconst indices = this.Reveal.getIndices();\n\n\t\t\tthis.Reveal.slide( indices.h, indices.v );\n\t\t\tthis.Reveal.layout();\n\t\t\tthis.Reveal.cueAutoSlide();\n\n\t\t\t// Notify observers of the overview hiding\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'overviewhidden',\n\t\t\t\tdata: {\n\t\t\t\t\t'indexh': indices.h,\n\t\t\t\t\t'indexv': indices.v,\n\t\t\t\t\t'currentSlide': this.Reveal.getCurrentSlide()\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\t}\n\n\t/**\n\t * Toggles the slide overview mode on and off.\n\t *\n\t * @param {Boolean} [override] Flag which overrides the\n\t * toggle logic and forcibly sets the desired state. True means\n\t * overview is open, false means it's closed.\n\t */\n\ttoggle( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? this.activate() : this.deactivate();\n\t\t}\n\t\telse {\n\t\t\tthis.isActive() ? this.deactivate() : this.activate();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if the overview is currently active.\n\t *\n\t * @return {Boolean} true if the overview is active,\n\t * false otherwise\n\t */\n\tisActive() {\n\n\t\treturn this.active;\n\n\t}\n\n\t/**\n\t * Invoked when a slide is and we're in the overview.\n\t *\n\t * @param {object} event\n\t */\n\tonSlideClicked( event ) {\n\n\t\tif( this.isActive() ) {\n\t\t\tevent.preventDefault();\n\n\t\t\tlet element = event.target;\n\n\t\t\twhile( element && !element.nodeName.match( /section/gi ) ) {\n\t\t\t\telement = element.parentNode;\n\t\t\t}\n\n\t\t\tif( element && !element.classList.contains( 'disabled' ) ) {\n\n\t\t\t\tthis.deactivate();\n\n\t\t\t\tif( element.nodeName.match( /section/gi ) ) {\n\t\t\t\t\tlet h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),\n\t\t\t\t\t\tv = parseInt( element.getAttribute( 'data-index-v' ), 10 );\n\n\t\t\t\t\tthis.Reveal.slide( h, v );\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\n\t}\n\n}","import { enterFullscreen } from '../utils/util.js'\n\n/**\n * Handles all reveal.js keyboard interactions.\n */\nexport default class Keyboard {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// A key:value map of keyboard keys and descriptions of\n\t\t// the actions they trigger\n\t\tthis.shortcuts = {};\n\n\t\t// Holds custom key code mappings\n\t\tthis.bindings = {};\n\n\t\tthis.onDocumentKeyDown = this.onDocumentKeyDown.bind( this );\n\t\tthis.onDocumentKeyPress = this.onDocumentKeyPress.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.navigationMode === 'linear' ) {\n\t\t\tthis.shortcuts['&#8594;  ,  &#8595;  ,  SPACE  ,  N  ,  L  ,  J'] = 'Next slide';\n\t\t\tthis.shortcuts['&#8592;  ,  &#8593;  ,  P  ,  H  ,  K']           = 'Previous slide';\n\t\t}\n\t\telse {\n\t\t\tthis.shortcuts['N  ,  SPACE']   = 'Next slide';\n\t\t\tthis.shortcuts['P  ,  Shift SPACE']             = 'Previous slide';\n\t\t\tthis.shortcuts['&#8592;  ,  H'] = 'Navigate left';\n\t\t\tthis.shortcuts['&#8594;  ,  L'] = 'Navigate right';\n\t\t\tthis.shortcuts['&#8593;  ,  K'] = 'Navigate up';\n\t\t\tthis.shortcuts['&#8595;  ,  J'] = 'Navigate down';\n\t\t}\n\n\t\tthis.shortcuts['Alt + &#8592;/&#8593/&#8594;/&#8595;']        = 'Navigate without fragments';\n\t\tthis.shortcuts['Shift + &#8592;/&#8593/&#8594;/&#8595;']      = 'Jump to first/last slide';\n\t\tthis.shortcuts['B  ,  .']                       = 'Pause';\n\t\tthis.shortcuts['F']                             = 'Fullscreen';\n\t\tthis.shortcuts['ESC, O']                        = 'Slide overview';\n\n\t}\n\n\t/**\n\t * Starts listening for keyboard events.\n\t */\n\tbind() {\n\n\t\tdocument.addEventListener( 'keydown', this.onDocumentKeyDown, false );\n\t\tdocument.addEventListener( 'keypress', this.onDocumentKeyPress, false );\n\n\t}\n\n\t/**\n\t * Stops listening for keyboard events.\n\t */\n\tunbind() {\n\n\t\tdocument.removeEventListener( 'keydown', this.onDocumentKeyDown, false );\n\t\tdocument.removeEventListener( 'keypress', this.onDocumentKeyPress, false );\n\n\t}\n\n\t/**\n\t * Add a custom key binding with optional description to\n\t * be added to the help screen.\n\t */\n\taddKeyBinding( binding, callback ) {\n\n\t\tif( typeof binding === 'object' && binding.keyCode ) {\n\t\t\tthis.bindings[binding.keyCode] = {\n\t\t\t\tcallback: callback,\n\t\t\t\tkey: binding.key,\n\t\t\t\tdescription: binding.description\n\t\t\t};\n\t\t}\n\t\telse {\n\t\t\tthis.bindings[binding] = {\n\t\t\t\tcallback: callback,\n\t\t\t\tkey: null,\n\t\t\t\tdescription: null\n\t\t\t};\n\t\t}\n\n\t}\n\n\t/**\n\t * Removes the specified custom key binding.\n\t */\n\tremoveKeyBinding( keyCode ) {\n\n\t\tdelete this.bindings[keyCode];\n\n\t}\n\n\t/**\n\t * Programmatically triggers a keyboard event\n\t *\n\t * @param {int} keyCode\n\t */\n\ttriggerKey( keyCode ) {\n\n\t\tthis.onDocumentKeyDown( { keyCode } );\n\n\t}\n\n\t/**\n\t * Registers a new shortcut to include in the help overlay\n\t *\n\t * @param {String} key\n\t * @param {String} value\n\t */\n\tregisterKeyboardShortcut( key, value ) {\n\n\t\tthis.shortcuts[key] = value;\n\n\t}\n\n\tgetShortcuts() {\n\n\t\treturn this.shortcuts;\n\n\t}\n\n\tgetBindings() {\n\n\t\treturn this.bindings;\n\n\t}\n\n\t/**\n\t * Handler for the document level 'keypress' event.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentKeyPress( event ) {\n\n\t\t// Check if the pressed key is question mark\n\t\tif( event.shiftKey && event.charCode === 63 ) {\n\t\t\tthis.Reveal.toggleHelp();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the document level 'keydown' event.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentKeyDown( event ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\t// If there's a condition specified and it returns false,\n\t\t// ignore this event\n\t\tif( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// If keyboardCondition is set, only capture keyboard events\n\t\t// for embedded decks when they are focused\n\t\tif( config.keyboardCondition === 'focused' && !this.Reveal.isFocused() ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Shorthand\n\t\tlet keyCode = event.keyCode;\n\n\t\t// Remember if auto-sliding was paused so we can toggle it\n\t\tlet autoSlideWasPaused = !this.Reveal.isAutoSliding();\n\n\t\tthis.Reveal.onUserInput( event );\n\n\t\t// Is there a focused element that could be using the keyboard?\n\t\tlet activeElementIsCE = document.activeElement && document.activeElement.isContentEditable === true;\n\t\tlet activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );\n\t\tlet activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);\n\n\t\t// Whitelist certain modifiers for slide navigation shortcuts\n\t\tlet isNavigationKey = [32, 37, 38, 39, 40, 78, 80].indexOf( event.keyCode ) !== -1;\n\n\t\t// Prevent all other events when a modifier is pressed\n\t\tlet unusedModifier = \t!( isNavigationKey && event.shiftKey || event.altKey ) &&\n\t\t\t\t\t\t\t\t( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );\n\n\t\t// Disregard the event if there's a focused element or a\n\t\t// keyboard modifier key is present\n\t\tif( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;\n\n\t\t// While paused only allow resume keyboard events; 'b', 'v', '.'\n\t\tlet resumeKeyCodes = [66,86,190,191];\n\t\tlet key;\n\n\t\t// Custom key bindings for togglePause should be able to resume\n\t\tif( typeof config.keyboard === 'object' ) {\n\t\t\tfor( key in config.keyboard ) {\n\t\t\t\tif( config.keyboard[key] === 'togglePause' ) {\n\t\t\t\t\tresumeKeyCodes.push( parseInt( key, 10 ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif( this.Reveal.isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Use linear navigation if we're configured to OR if\n\t\t// the presentation is one-dimensional\n\t\tlet useLinearMode = config.navigationMode === 'linear' || !this.Reveal.hasHorizontalSlides() || !this.Reveal.hasVerticalSlides();\n\n\t\tlet triggered = false;\n\n\t\t// 1. User defined key bindings\n\t\tif( typeof config.keyboard === 'object' ) {\n\n\t\t\tfor( key in config.keyboard ) {\n\n\t\t\t\t// Check if this binding matches the pressed key\n\t\t\t\tif( parseInt( key, 10 ) === keyCode ) {\n\n\t\t\t\t\tlet value = config.keyboard[ key ];\n\n\t\t\t\t\t// Callback function\n\t\t\t\t\tif( typeof value === 'function' ) {\n\t\t\t\t\t\tvalue.apply( null, [ event ] );\n\t\t\t\t\t}\n\t\t\t\t\t// String shortcuts to reveal.js API\n\t\t\t\t\telse if( typeof value === 'string' && typeof this.Reveal[ value ] === 'function' ) {\n\t\t\t\t\t\tthis.Reveal[ value ].call();\n\t\t\t\t\t}\n\n\t\t\t\t\ttriggered = true;\n\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t// 2. Registered custom key bindings\n\t\tif( triggered === false ) {\n\n\t\t\tfor( key in this.bindings ) {\n\n\t\t\t\t// Check if this binding matches the pressed key\n\t\t\t\tif( parseInt( key, 10 ) === keyCode ) {\n\n\t\t\t\t\tlet action = this.bindings[ key ].callback;\n\n\t\t\t\t\t// Callback function\n\t\t\t\t\tif( typeof action === 'function' ) {\n\t\t\t\t\t\taction.apply( null, [ event ] );\n\t\t\t\t\t}\n\t\t\t\t\t// String shortcuts to reveal.js API\n\t\t\t\t\telse if( typeof action === 'string' && typeof this.Reveal[ action ] === 'function' ) {\n\t\t\t\t\t\tthis.Reveal[ action ].call();\n\t\t\t\t\t}\n\n\t\t\t\t\ttriggered = true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// 3. System defined key bindings\n\t\tif( triggered === false ) {\n\n\t\t\t// Assume true and try to prove false\n\t\t\ttriggered = true;\n\n\t\t\t// P, PAGE UP\n\t\t\tif( keyCode === 80 || keyCode === 33 ) {\n\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t}\n\t\t\t// N, PAGE DOWN\n\t\t\telse if( keyCode === 78 || keyCode === 34 ) {\n\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t}\n\t\t\t// H, LEFT\n\t\t\telse if( keyCode === 72 || keyCode === 37 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( 0 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.left({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// L, RIGHT\n\t\t\telse if( keyCode === 76 || keyCode === 39 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.right({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// K, UP\n\t\t\telse if( keyCode === 75 || keyCode === 38 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( undefined, 0 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.up({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// J, DOWN\n\t\t\telse if( keyCode === 74 || keyCode === 40 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( undefined, Number.MAX_VALUE );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.down({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// HOME\n\t\t\telse if( keyCode === 36 ) {\n\t\t\t\tthis.Reveal.slide( 0 );\n\t\t\t}\n\t\t\t// END\n\t\t\telse if( keyCode === 35 ) {\n\t\t\t\tthis.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );\n\t\t\t}\n\t\t\t// SPACE\n\t\t\telse if( keyCode === 32 ) {\n\t\t\t\tif( this.Reveal.overview.isActive() ) {\n\t\t\t\t\tthis.Reveal.overview.deactivate();\n\t\t\t\t}\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS \"BLACK SCREEN\" BUTTON\n\t\t\telse if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {\n\t\t\t\tthis.Reveal.togglePause();\n\t\t\t}\n\t\t\t// F\n\t\t\telse if( keyCode === 70 ) {\n\t\t\t\tenterFullscreen( config.embedded ? this.Reveal.getViewportElement() : document.documentElement );\n\t\t\t}\n\t\t\t// A\n\t\t\telse if( keyCode === 65 ) {\n\t\t\t\tif ( config.autoSlideStoppable ) {\n\t\t\t\t\tthis.Reveal.toggleAutoSlide( autoSlideWasPaused );\n\t\t\t\t}\n\t\t\t}\n\t\t\telse {\n\t\t\t\ttriggered = false;\n\t\t\t}\n\n\t\t}\n\n\t\t// If the input resulted in a triggered action we should prevent\n\t\t// the browsers default behavior\n\t\tif( triggered ) {\n\t\t\tevent.preventDefault && event.preventDefault();\n\t\t}\n\t\t// ESC or O key\n\t\telse if( keyCode === 27 || keyCode === 79 ) {\n\t\t\tif( this.Reveal.closeOverlay() === false ) {\n\t\t\t\tthis.Reveal.overview.toggle();\n\t\t\t}\n\n\t\t\tevent.preventDefault && event.preventDefault();\n\t\t}\n\n\t\t// If auto-sliding is enabled we need to cue up\n\t\t// another timeout\n\t\tthis.Reveal.cueAutoSlide();\n\n\t}\n\n}","/**\n * Reads and writes the URL based on reveal.js' current state.\n */\nexport default class Location {\n\n\t// The minimum number of milliseconds that must pass between\n\t// calls to history.replaceState\n\tMAX_REPLACE_STATE_FREQUENCY = 1000\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Delays updates to the URL due to a Chrome thumbnailer bug\n\t\tthis.writeURLTimeout = 0;\n\n\t\tthis.replaceStateTimestamp = 0;\n\n\t\tthis.onWindowHashChange = this.onWindowHashChange.bind( this );\n\n\t}\n\n\tbind() {\n\n\t\twindow.addEventListener( 'hashchange', this.onWindowHashChange, false );\n\n\t}\n\n\tunbind() {\n\n\t\twindow.removeEventListener( 'hashchange', this.onWindowHashChange, false );\n\n\t}\n\n\t/**\n\t * Returns the slide indices for the given hash link.\n\t *\n\t * @param {string} [hash] the hash string that we want to\n\t * find the indices for\n\t *\n\t * @returns slide indices or null\n\t */\n\tgetIndicesFromHash( hash=window.location.hash ) {\n\n\t\t// Attempt to parse the hash as either an index or name\n\t\tlet name = hash.replace( /^#\\/?/, '' );\n\t\tlet bits = name.split( '/' );\n\n\t\t// If the first bit is not fully numeric and there is a name we\n\t\t// can assume that this is a named link\n\t\tif( !/^[0-9]*$/.test( bits[0] ) && name.length ) {\n\t\t\tlet element;\n\n\t\t\tlet f;\n\n\t\t\t// Parse named links with fragments (#/named-link/2)\n\t\t\tif( /\\/[-\\d]+$/g.test( name ) ) {\n\t\t\t\tf = parseInt( name.split( '/' ).pop(), 10 );\n\t\t\t\tf = isNaN(f) ? undefined : f;\n\t\t\t\tname = name.split( '/' ).shift();\n\t\t\t}\n\n\t\t\t// Ensure the named link is a valid HTML ID attribute\n\t\t\ttry {\n\t\t\t\telement = document.getElementById( decodeURIComponent( name ) );\n\t\t\t}\n\t\t\tcatch ( error ) { }\n\n\t\t\tif( element ) {\n\t\t\t\treturn { ...this.Reveal.getIndices( element ), f };\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tconst config = this.Reveal.getConfig();\n\t\t\tlet hashIndexBase = config.hashOneBasedIndex ? 1 : 0;\n\n\t\t\t// Read the index components of the hash\n\t\t\tlet h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,\n\t\t\t\tv = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,\n\t\t\t\tf;\n\n\t\t\tif( config.fragmentInURL ) {\n\t\t\t\tf = parseInt( bits[2], 10 );\n\t\t\t\tif( isNaN( f ) ) {\n\t\t\t\t\tf = undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn { h, v, f };\n\t\t}\n\n\t\t// The hash couldn't be parsed or no matching named link was found\n\t\treturn null\n\n\t}\n\n\t/**\n\t * Reads the current URL (hash) and navigates accordingly.\n\t */\n\treadURL() {\n\n\t\tconst currentIndices = this.Reveal.getIndices();\n\t\tconst newIndices = this.getIndicesFromHash();\n\n\t\tif( newIndices ) {\n\t\t\tif( ( newIndices.h !== currentIndices.h || newIndices.v !== currentIndices.v || newIndices.f !== undefined ) ) {\n\t\t\t\t\tthis.Reveal.slide( newIndices.h, newIndices.v, newIndices.f );\n\t\t\t}\n\t\t}\n\t\t// If no new indices are available, we're trying to navigate to\n\t\t// a slide hash that does not exist\n\t\telse {\n\t\t\tthis.Reveal.slide( currentIndices.h || 0, currentIndices.v || 0 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the page URL (hash) to reflect the current\n\t * state.\n\t *\n\t * @param {number} delay The time in ms to wait before\n\t * writing the hash\n\t */\n\twriteURL( delay ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\n\t\t// Make sure there's never more than one timeout running\n\t\tclearTimeout( this.writeURLTimeout );\n\n\t\t// If a delay is specified, timeout this call\n\t\tif( typeof delay === 'number' ) {\n\t\t\tthis.writeURLTimeout = setTimeout( this.writeURL, delay );\n\t\t}\n\t\telse if( currentSlide ) {\n\n\t\t\tlet hash = this.getHash();\n\n\t\t\t// If we're configured to push to history OR the history\n\t\t\t// API is not avaialble.\n\t\t\tif( config.history ) {\n\t\t\t\twindow.location.hash = hash;\n\t\t\t}\n\t\t\t// If we're configured to reflect the current slide in the\n\t\t\t// URL without pushing to history.\n\t\t\telse if( config.hash ) {\n\t\t\t\t// If the hash is empty, don't add it to the URL\n\t\t\t\tif( hash === '/' ) {\n\t\t\t\t\tthis.debouncedReplaceState( window.location.pathname + window.location.search );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.debouncedReplaceState( '#' + hash );\n\t\t\t\t}\n\t\t\t}\n\t\t\t// UPDATE: The below nuking of all hash changes breaks\n\t\t\t// anchors on pages where reveal.js is running. Removed\n\t\t\t// in 4.0. Why was it here in the first place? ¯\\_(ツ)_/¯\n\t\t\t//\n\t\t\t// If history and hash are both disabled, a hash may still\n\t\t\t// be added to the URL by clicking on a href with a hash\n\t\t\t// target. Counter this by always removing the hash.\n\t\t\t// else {\n\t\t\t// \twindow.history.replaceState( null, null, window.location.pathname + window.location.search );\n\t\t\t// }\n\n\t\t}\n\n\t}\n\n\treplaceState( url ) {\n\n\t\twindow.history.replaceState( null, null, url );\n\t\tthis.replaceStateTimestamp = Date.now();\n\n\t}\n\n\tdebouncedReplaceState( url ) {\n\n\t\tclearTimeout( this.replaceStateTimeout );\n\n\t\tif( Date.now() - this.replaceStateTimestamp > this.MAX_REPLACE_STATE_FREQUENCY ) {\n\t\t\tthis.replaceState( url );\n\t\t}\n\t\telse {\n\t\t\tthis.replaceStateTimeout = setTimeout( () => this.replaceState( url ), this.MAX_REPLACE_STATE_FREQUENCY );\n\t\t}\n\n\t}\n\n\t/**\n\t * Return a hash URL that will resolve to the given slide location.\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide to link to\n\t */\n\tgetHash( slide ) {\n\n\t\tlet url = '/';\n\n\t\t// Attempt to create a named link based on the slide's ID\n\t\tlet s = slide || this.Reveal.getCurrentSlide();\n\t\tlet id = s ? s.getAttribute( 'id' ) : null;\n\t\tif( id ) {\n\t\t\tid = encodeURIComponent( id );\n\t\t}\n\n\t\tlet index = this.Reveal.getIndices( slide );\n\t\tif( !this.Reveal.getConfig().fragmentInURL ) {\n\t\t\tindex.f = undefined;\n\t\t}\n\n\t\t// If the current slide has an ID, use that as a named link,\n\t\t// but we don't support named links with a fragment index\n\t\tif( typeof id === 'string' && id.length ) {\n\t\t\turl = '/' + id;\n\n\t\t\t// If there is also a fragment, append that at the end\n\t\t\t// of the named link, like: #/named-link/2\n\t\t\tif( index.f >= 0 ) url += '/' + index.f;\n\t\t}\n\t\t// Otherwise use the /h/v index\n\t\telse {\n\t\t\tlet hashIndexBase = this.Reveal.getConfig().hashOneBasedIndex ? 1 : 0;\n\t\t\tif( index.h > 0 || index.v > 0 || index.f >= 0 ) url += index.h + hashIndexBase;\n\t\t\tif( index.v > 0 || index.f >= 0 ) url += '/' + (index.v + hashIndexBase );\n\t\t\tif( index.f >= 0 ) url += '/' + index.f;\n\t\t}\n\n\t\treturn url;\n\n\t}\n\n\t/**\n\t * Handler for the window level 'hashchange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tonWindowHashChange( event ) {\n\n\t\tthis.readURL();\n\n\t}\n\n}","import { queryAll } from '../utils/util.js'\nimport { isAndroid } from '../utils/device.js'\n\n/**\n * Manages our presentation controls. This includes both\n * the built-in control arrows as well as event monitoring\n * of any elements within the presentation with either of the\n * following helper classes:\n * - .navigate-up\n * - .navigate-right\n * - .navigate-down\n * - .navigate-left\n * - .navigate-next\n * - .navigate-prev\n */\nexport default class Controls {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onNavigateLeftClicked = this.onNavigateLeftClicked.bind( this );\n\t\tthis.onNavigateRightClicked = this.onNavigateRightClicked.bind( this );\n\t\tthis.onNavigateUpClicked = this.onNavigateUpClicked.bind( this );\n\t\tthis.onNavigateDownClicked = this.onNavigateDownClicked.bind( this );\n\t\tthis.onNavigatePrevClicked = this.onNavigatePrevClicked.bind( this );\n\t\tthis.onNavigateNextClicked = this.onNavigateNextClicked.bind( this );\n\n\t}\n\n\trender() {\n\n\t\tconst rtl = this.Reveal.getConfig().rtl;\n\t\tconst revealElement = this.Reveal.getRevealElement();\n\n\t\tthis.element = document.createElement( 'aside' );\n\t\tthis.element.className = 'controls';\n\t\tthis.element.innerHTML =\n\t\t\t`<button class=\"navigate-left\" aria-label=\"${ rtl ? 'next slide' : 'previous slide' }\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-right\" aria-label=\"${ rtl ? 'previous slide' : 'next slide' }\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-up\" aria-label=\"above slide\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-down\" aria-label=\"below slide\"><div class=\"controls-arrow\"></div></button>`;\n\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t\t// There can be multiple instances of controls throughout the page\n\t\tthis.controlsLeft = queryAll( revealElement, '.navigate-left' );\n\t\tthis.controlsRight = queryAll( revealElement, '.navigate-right' );\n\t\tthis.controlsUp = queryAll( revealElement, '.navigate-up' );\n\t\tthis.controlsDown = queryAll( revealElement, '.navigate-down' );\n\t\tthis.controlsPrev = queryAll( revealElement, '.navigate-prev' );\n\t\tthis.controlsNext = queryAll( revealElement, '.navigate-next' );\n\n\t\t// The left, right and down arrows in the standard reveal.js controls\n\t\tthis.controlsRightArrow = this.element.querySelector( '.navigate-right' );\n\t\tthis.controlsLeftArrow = this.element.querySelector( '.navigate-left' );\n\t\tthis.controlsDownArrow = this.element.querySelector( '.navigate-down' );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tthis.element.style.display = config.controls ? 'block' : 'none';\n\n\t\tthis.element.setAttribute( 'data-controls-layout', config.controlsLayout );\n\t\tthis.element.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );\n\n\t}\n\n\tbind() {\n\n\t\t// Listen to both touch and click events, in case the device\n\t\t// supports both\n\t\tlet pointerEvents = [ 'touchstart', 'click' ];\n\n\t\t// Only support touch for Android, fixes double navigations in\n\t\t// stock browser\n\t\tif( isAndroid ) {\n\t\t\tpointerEvents = [ 'touchstart' ];\n\t\t}\n\n\t\tpointerEvents.forEach( eventName => {\n\t\t\tthis.controlsLeft.forEach( el => el.addEventListener( eventName, this.onNavigateLeftClicked, false ) );\n\t\t\tthis.controlsRight.forEach( el => el.addEventListener( eventName, this.onNavigateRightClicked, false ) );\n\t\t\tthis.controlsUp.forEach( el => el.addEventListener( eventName, this.onNavigateUpClicked, false ) );\n\t\t\tthis.controlsDown.forEach( el => el.addEventListener( eventName, this.onNavigateDownClicked, false ) );\n\t\t\tthis.controlsPrev.forEach( el => el.addEventListener( eventName, this.onNavigatePrevClicked, false ) );\n\t\t\tthis.controlsNext.forEach( el => el.addEventListener( eventName, this.onNavigateNextClicked, false ) );\n\t\t} );\n\n\t}\n\n\tunbind() {\n\n\t\t[ 'touchstart', 'click' ].forEach( eventName => {\n\t\t\tthis.controlsLeft.forEach( el => el.removeEventListener( eventName, this.onNavigateLeftClicked, false ) );\n\t\t\tthis.controlsRight.forEach( el => el.removeEventListener( eventName, this.onNavigateRightClicked, false ) );\n\t\t\tthis.controlsUp.forEach( el => el.removeEventListener( eventName, this.onNavigateUpClicked, false ) );\n\t\t\tthis.controlsDown.forEach( el => el.removeEventListener( eventName, this.onNavigateDownClicked, false ) );\n\t\t\tthis.controlsPrev.forEach( el => el.removeEventListener( eventName, this.onNavigatePrevClicked, false ) );\n\t\t\tthis.controlsNext.forEach( el => el.removeEventListener( eventName, this.onNavigateNextClicked, false ) );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Updates the state of all control/navigation arrows.\n\t */\n\tupdate() {\n\n\t\tlet routes = this.Reveal.availableRoutes();\n\n\t\t// Remove the 'enabled' class from all directions\n\t\t[...this.controlsLeft, ...this.controlsRight, ...this.controlsUp, ...this.controlsDown, ...this.controlsPrev, ...this.controlsNext].forEach( node => {\n\t\t\tnode.classList.remove( 'enabled', 'fragmented' );\n\n\t\t\t// Set 'disabled' attribute on all directions\n\t\t\tnode.setAttribute( 'disabled', 'disabled' );\n\t\t} );\n\n\t\t// Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons\n\t\tif( routes.left ) this.controlsLeft.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.right ) this.controlsRight.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.up ) this.controlsUp.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.down ) this.controlsDown.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t// Prev/next buttons\n\t\tif( routes.left || routes.up ) this.controlsPrev.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.right || routes.down ) this.controlsNext.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t// Highlight fragment directions\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide ) {\n\n\t\t\tlet fragmentsRoutes = this.Reveal.fragments.availableRoutes();\n\n\t\t\t// Always apply fragment decorator to prev/next buttons\n\t\t\tif( fragmentsRoutes.prev ) this.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\tif( fragmentsRoutes.next ) this.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t\t// Apply fragment decorators to directional buttons based on\n\t\t\t// what slide axis they are in\n\t\t\tif( this.Reveal.isVerticalSlide( currentSlide ) ) {\n\t\t\t\tif( fragmentsRoutes.prev ) this.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t\tif( fragmentsRoutes.next ) this.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif( fragmentsRoutes.prev ) this.controlsLeft.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t\tif( fragmentsRoutes.next ) this.controlsRight.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t}\n\n\t\t}\n\n\t\tif( this.Reveal.getConfig().controlsTutorial ) {\n\n\t\t\tlet indices = this.Reveal.getIndices();\n\n\t\t\t// Highlight control arrows with an animation to ensure\n\t\t\t// that the viewer knows how to navigate\n\t\t\tif( !this.Reveal.hasNavigatedVertically() && routes.down ) {\n\t\t\t\tthis.controlsDownArrow.classList.add( 'highlight' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.controlsDownArrow.classList.remove( 'highlight' );\n\n\t\t\t\tif( this.Reveal.getConfig().rtl ) {\n\n\t\t\t\t\tif( !this.Reveal.hasNavigatedHorizontally() && routes.left && indices.v === 0 ) {\n\t\t\t\t\t\tthis.controlsLeftArrow.classList.add( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.controlsLeftArrow.classList.remove( 'highlight' );\n\t\t\t\t\t}\n\n\t\t\t\t} else {\n\n\t\t\t\t\tif( !this.Reveal.hasNavigatedHorizontally() && routes.right && indices.v === 0 ) {\n\t\t\t\t\t\tthis.controlsRightArrow.classList.add( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.controlsRightArrow.classList.remove( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tdestroy() {\n\n\t\tthis.unbind();\n\t\tthis.element.remove();\n\n\t}\n\n\t/**\n\t * Event handlers for navigation control buttons.\n\t */\n\tonNavigateLeftClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tif( this.Reveal.getConfig().navigationMode === 'linear' ) {\n\t\t\tthis.Reveal.prev();\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.left();\n\t\t}\n\n\t}\n\n\tonNavigateRightClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tif( this.Reveal.getConfig().navigationMode === 'linear' ) {\n\t\t\tthis.Reveal.next();\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.right();\n\t\t}\n\n\t}\n\n\tonNavigateUpClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.up();\n\n\t}\n\n\tonNavigateDownClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.down();\n\n\t}\n\n\tonNavigatePrevClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.prev();\n\n\t}\n\n\tonNavigateNextClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.next();\n\n\t}\n\n\n}","/**\n * Creates a visual progress bar for the presentation.\n */\nexport default class Progress {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onProgressClicked = this.onProgressClicked.bind( this );\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'progress';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t\tthis.bar = document.createElement( 'span' );\n\t\tthis.element.appendChild( this.bar );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tthis.element.style.display = config.progress ? 'block' : 'none';\n\n\t}\n\n\tbind() {\n\n\t\tif( this.Reveal.getConfig().progress && this.element ) {\n\t\t\tthis.element.addEventListener( 'click', this.onProgressClicked, false );\n\t\t}\n\n\t}\n\n\tunbind() {\n\n\t\tif ( this.Reveal.getConfig().progress && this.element ) {\n\t\t\tthis.element.removeEventListener( 'click', this.onProgressClicked, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the progress bar to reflect the current slide.\n\t */\n\tupdate() {\n\n\t\t// Update progress if enabled\n\t\tif( this.Reveal.getConfig().progress && this.bar ) {\n\n\t\t\tlet scale = this.Reveal.getProgress();\n\n\t\t\t// Don't fill the progress bar if there's only one slide\n\t\t\tif( this.Reveal.getTotalSlides() < 2 ) {\n\t\t\t\tscale = 0;\n\t\t\t}\n\n\t\t\tthis.bar.style.transform = 'scaleX('+ scale +')';\n\n\t\t}\n\n\t}\n\n\tgetMaxWidth() {\n\n\t\treturn this.Reveal.getRevealElement().offsetWidth;\n\n\t}\n\n\t/**\n\t * Clicking on the progress bar results in a navigation to the\n\t * closest approximate horizontal slide using this equation:\n\t *\n\t * ( clickX / presentationWidth ) * numberOfSlides\n\t *\n\t * @param {object} event\n\t */\n\tonProgressClicked( event ) {\n\n\t\tthis.Reveal.onUserInput( event );\n\n\t\tevent.preventDefault();\n\n\t\tlet slides = this.Reveal.getSlides();\n\t\tlet slidesTotal = slides.length;\n\t\tlet slideIndex = Math.floor( ( event.clientX / this.getMaxWidth() ) * slidesTotal );\n\n\t\tif( this.Reveal.getConfig().rtl ) {\n\t\t\tslideIndex = slidesTotal - slideIndex;\n\t\t}\n\n\t\tlet targetIndices = this.Reveal.getIndices(slides[slideIndex]);\n\t\tthis.Reveal.slide( targetIndices.h, targetIndices.v );\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","/**\n * Handles hiding of the pointer/cursor when inactive.\n */\nexport default class Pointer {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Throttles mouse wheel navigation\n\t\tthis.lastMouseWheelStep = 0;\n\n\t\t// Is the mouse pointer currently hidden from view\n\t\tthis.cursorHidden = false;\n\n\t\t// Timeout used to determine when the cursor is inactive\n\t\tthis.cursorInactiveTimeout = 0;\n\n\t\tthis.onDocumentCursorActive = this.onDocumentCursorActive.bind( this );\n\t\tthis.onDocumentMouseScroll = this.onDocumentMouseScroll.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.mouseWheel ) {\n\t\t\tdocument.addEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF\n\t\t\tdocument.addEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\t}\n\t\telse {\n\t\t\tdocument.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF\n\t\t\tdocument.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\t}\n\n\t\t// Auto-hide the mouse pointer when its inactive\n\t\tif( config.hideInactiveCursor ) {\n\t\t\tdocument.addEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\t\tdocument.addEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\t\t}\n\t\telse {\n\t\t\tthis.showCursor();\n\n\t\t\tdocument.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\t\tdocument.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Shows the mouse pointer after it has been hidden with\n\t * #hideCursor.\n\t */\n\tshowCursor() {\n\n\t\tif( this.cursorHidden ) {\n\t\t\tthis.cursorHidden = false;\n\t\t\tthis.Reveal.getRevealElement().style.cursor = '';\n\t\t}\n\n\t}\n\n\t/**\n\t * Hides the mouse pointer when it's on top of the .reveal\n\t * container.\n\t */\n\thideCursor() {\n\n\t\tif( this.cursorHidden === false ) {\n\t\t\tthis.cursorHidden = true;\n\t\t\tthis.Reveal.getRevealElement().style.cursor = 'none';\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.showCursor();\n\n\t\tdocument.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false );\n\t\tdocument.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\tdocument.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\tdocument.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\n\t}\n\n\t/**\n\t * Called whenever there is mouse input at the document level\n\t * to determine if the cursor is active or not.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentCursorActive( event ) {\n\n\t\tthis.showCursor();\n\n\t\tclearTimeout( this.cursorInactiveTimeout );\n\n\t\tthis.cursorInactiveTimeout = setTimeout( this.hideCursor.bind( this ), this.Reveal.getConfig().hideCursorTime );\n\n\t}\n\n\t/**\n\t * Handles mouse wheel scrolling, throttled to avoid skipping\n\t * multiple slides.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentMouseScroll( event ) {\n\n\t\tif( Date.now() - this.lastMouseWheelStep > 1000 ) {\n\n\t\t\tthis.lastMouseWheelStep = Date.now();\n\n\t\t\tlet delta = event.detail || -event.wheelDelta;\n\t\t\tif( delta > 0 ) {\n\t\t\t\tthis.Reveal.next();\n\t\t\t}\n\t\t\telse if( delta < 0 ) {\n\t\t\t\tthis.Reveal.prev();\n\t\t\t}\n\n\t\t}\n\n\t}\n\n}","var DESCRIPTORS = require('../internals/descriptors');\nvar objectKeys = require('../internals/object-keys');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar propertyIsEnumerable = require('../internals/object-property-is-enumerable').f;\n\n// `Object.{ entries, values }` methods implementation\nvar createMethod = function (TO_ENTRIES) {\n  return function (it) {\n    var O = toIndexedObject(it);\n    var keys = objectKeys(O);\n    var length = keys.length;\n    var i = 0;\n    var result = [];\n    var key;\n    while (length > i) {\n      key = keys[i++];\n      if (!DESCRIPTORS || propertyIsEnumerable.call(O, key)) {\n        result.push(TO_ENTRIES ? [key, O[key]] : O[key]);\n      }\n    }\n    return result;\n  };\n};\n\nmodule.exports = {\n  // `Object.entries` method\n  // https://tc39.es/ecma262/#sec-object.entries\n  entries: createMethod(true),\n  // `Object.values` method\n  // https://tc39.es/ecma262/#sec-object.values\n  values: createMethod(false)\n};\n","var $ = require('../internals/export');\nvar $values = require('../internals/object-to-array').values;\n\n// `Object.values` method\n// https://tc39.es/ecma262/#sec-object.values\n$({ target: 'Object', stat: true }, {\n  values: function values(O) {\n    return $values(O);\n  }\n});\n","/**\n * Loads a JavaScript file from the given URL and executes it.\n *\n * @param {string} url Address of the .js file to load\n * @param {function} callback Method to invoke when the script\n * has loaded and executed\n */\nexport const loadScript = ( url, callback ) => {\n\n\tconst script = document.createElement( 'script' );\n\tscript.type = 'text/javascript';\n\tscript.async = false;\n\tscript.defer = false;\n\tscript.src = url;\n\n\tif( typeof callback === 'function' ) {\n\n\t\t// Success callback\n\t\tscript.onload = script.onreadystatechange = event => {\n\t\t\tif( event.type === 'load' || /loaded|complete/.test( script.readyState ) ) {\n\n\t\t\t\t// Kill event listeners\n\t\t\t\tscript.onload = script.onreadystatechange = script.onerror = null;\n\n\t\t\t\tcallback();\n\n\t\t\t}\n\t\t};\n\n\t\t// Error callback\n\t\tscript.onerror = err => {\n\n\t\t\t// Kill event listeners\n\t\t\tscript.onload = script.onreadystatechange = script.onerror = null;\n\n\t\t\tcallback( new Error( 'Failed loading script: ' + script.src + '\\n' + err ) );\n\n\t\t};\n\n\t}\n\n\t// Append the script at the end of <head>\n\tconst head = document.querySelector( 'head' );\n\thead.insertBefore( script, head.lastChild );\n\n}","import { loadScript } from '../utils/loader.js'\n\n/**\n * Manages loading and registering of reveal.js plugins.\n */\nexport default class Plugins {\n\n\tconstructor( reveal ) {\n\n\t\tthis.Reveal = reveal;\n\n\t\t// Flags our current state (idle -> loading -> loaded)\n\t\tthis.state = 'idle';\n\n\t\t// An id:instance map of currently registed plugins\n\t\tthis.registeredPlugins = {};\n\n\t\tthis.asyncDependencies = [];\n\n\t}\n\n\t/**\n\t * Loads reveal.js dependencies, registers and\n\t * initializes plugins.\n\t *\n\t * Plugins are direct references to a reveal.js plugin\n\t * object that we register and initialize after any\n\t * synchronous dependencies have loaded.\n\t *\n\t * Dependencies are defined via the 'dependencies' config\n\t * option and will be loaded prior to starting reveal.js.\n\t * Some dependencies may have an 'async' flag, if so they\n\t * will load after reveal.js has been started up.\n\t */\n\tload( plugins, dependencies ) {\n\n\t\tthis.state = 'loading';\n\n\t\tplugins.forEach( this.registerPlugin.bind( this ) );\n\n\t\treturn new Promise( resolve => {\n\n\t\t\tlet scripts = [],\n\t\t\t\tscriptsToLoad = 0;\n\n\t\t\tdependencies.forEach( s => {\n\t\t\t\t// Load if there's no condition or the condition is truthy\n\t\t\t\tif( !s.condition || s.condition() ) {\n\t\t\t\t\tif( s.async ) {\n\t\t\t\t\t\tthis.asyncDependencies.push( s );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tscripts.push( s );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tif( scripts.length ) {\n\t\t\t\tscriptsToLoad = scripts.length;\n\n\t\t\t\tconst scriptLoadedCallback = (s) => {\n\t\t\t\t\tif( s && typeof s.callback === 'function' ) s.callback();\n\n\t\t\t\t\tif( --scriptsToLoad === 0 ) {\n\t\t\t\t\t\tthis.initPlugins().then( resolve );\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\t// Load synchronous scripts\n\t\t\t\tscripts.forEach( s => {\n\t\t\t\t\tif( typeof s.id === 'string' ) {\n\t\t\t\t\t\tthis.registerPlugin( s );\n\t\t\t\t\t\tscriptLoadedCallback( s );\n\t\t\t\t\t}\n\t\t\t\t\telse if( typeof s.src === 'string' ) {\n\t\t\t\t\t\tloadScript( s.src, () => scriptLoadedCallback(s) );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tconsole.warn( 'Unrecognized plugin format', s );\n\t\t\t\t\t\tscriptLoadedCallback();\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.initPlugins().then( resolve );\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Initializes our plugins and waits for them to be ready\n\t * before proceeding.\n\t */\n\tinitPlugins() {\n\n\t\treturn new Promise( resolve => {\n\n\t\t\tlet pluginValues = Object.values( this.registeredPlugins );\n\t\t\tlet pluginsToInitialize = pluginValues.length;\n\n\t\t\t// If there are no plugins, skip this step\n\t\t\tif( pluginsToInitialize === 0 ) {\n\t\t\t\tthis.loadAsync().then( resolve );\n\t\t\t}\n\t\t\t// ... otherwise initialize plugins\n\t\t\telse {\n\n\t\t\t\tlet initNextPlugin;\n\n\t\t\t\tlet afterPlugInitialized = () => {\n\t\t\t\t\tif( --pluginsToInitialize === 0 ) {\n\t\t\t\t\t\tthis.loadAsync().then( resolve );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tinitNextPlugin();\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\tlet i = 0;\n\n\t\t\t\t// Initialize plugins serially\n\t\t\t\tinitNextPlugin = () => {\n\n\t\t\t\t\tlet plugin = pluginValues[i++];\n\n\t\t\t\t\t// If the plugin has an 'init' method, invoke it\n\t\t\t\t\tif( typeof plugin.init === 'function' ) {\n\t\t\t\t\t\tlet promise = plugin.init( this.Reveal );\n\n\t\t\t\t\t\t// If the plugin returned a Promise, wait for it\n\t\t\t\t\t\tif( promise && typeof promise.then === 'function' ) {\n\t\t\t\t\t\t\tpromise.then( afterPlugInitialized );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tafterPlugInitialized();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tafterPlugInitialized();\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tinitNextPlugin();\n\n\t\t\t}\n\n\t\t} )\n\n\t}\n\n\t/**\n\t * Loads all async reveal.js dependencies.\n\t */\n\tloadAsync() {\n\n\t\tthis.state = 'loaded';\n\n\t\tif( this.asyncDependencies.length ) {\n\t\t\tthis.asyncDependencies.forEach( s => {\n\t\t\t\tloadScript( s.src, s.callback );\n\t\t\t} );\n\t\t}\n\n\t\treturn Promise.resolve();\n\n\t}\n\n\t/**\n\t * Registers a new plugin with this reveal.js instance.\n\t *\n\t * reveal.js waits for all regisered plugins to initialize\n\t * before considering itself ready, as long as the plugin\n\t * is registered before calling `Reveal.initialize()`.\n\t */\n\tregisterPlugin( plugin ) {\n\n\t\t// Backwards compatibility to make reveal.js ~3.9.0\n\t\t// plugins work with reveal.js 4.0.0\n\t\tif( arguments.length === 2 && typeof arguments[0] === 'string' ) {\n\t\t\tplugin = arguments[1];\n\t\t\tplugin.id = arguments[0];\n\t\t}\n\t\t// Plugin can optionally be a function which we call\n\t\t// to create an instance of the plugin\n\t\telse if( typeof plugin === 'function' ) {\n\t\t\tplugin = plugin();\n\t\t}\n\n\t\tlet id = plugin.id;\n\n\t\tif( typeof id !== 'string' ) {\n\t\t\tconsole.warn( 'Unrecognized plugin format; can\\'t find plugin.id', plugin );\n\t\t}\n\t\telse if( this.registeredPlugins[id] === undefined ) {\n\t\t\tthis.registeredPlugins[id] = plugin;\n\n\t\t\t// If a plugin is registered after reveal.js is loaded,\n\t\t\t// initialize it right away\n\t\t\tif( this.state === 'loaded' && typeof plugin.init === 'function' ) {\n\t\t\t\tplugin.init( this.Reveal );\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tconsole.warn( 'reveal.js: \"'+ id +'\" plugin has already been registered' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if a specific plugin has been registered.\n\t *\n\t * @param {String} id Unique plugin identifier\n\t */\n\thasPlugin( id ) {\n\n\t\treturn !!this.registeredPlugins[id];\n\n\t}\n\n\t/**\n\t * Returns the specific plugin instance, if a plugin\n\t * with the given ID has been registered.\n\t *\n\t * @param {String} id Unique plugin identifier\n\t */\n\tgetPlugin( id ) {\n\n\t\treturn this.registeredPlugins[id];\n\n\t}\n\n\tgetRegisteredPlugins() {\n\n\t\treturn this.registeredPlugins;\n\n\t}\n\n\tdestroy() {\n\n\t\tObject.values( this.registeredPlugins ).forEach( plugin => {\n\t\t\tif( typeof plugin.destroy === 'function' ) {\n\t\t\t\tplugin.destroy();\n\t\t\t}\n\t\t} );\n\n\t\tthis.registeredPlugins = {};\n\t\tthis.asyncDependencies = [];\n\n\t}\n\n}\n","/**\n * Copyright (c) 2014-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\nvar runtime = (function (exports) {\n  \"use strict\";\n\n  var Op = Object.prototype;\n  var hasOwn = Op.hasOwnProperty;\n  var undefined; // More compressible than void 0.\n  var $Symbol = typeof Symbol === \"function\" ? Symbol : {};\n  var iteratorSymbol = $Symbol.iterator || \"@@iterator\";\n  var asyncIteratorSymbol = $Symbol.asyncIterator || \"@@asyncIterator\";\n  var toStringTagSymbol = $Symbol.toStringTag || \"@@toStringTag\";\n\n  function define(obj, key, value) {\n    Object.defineProperty(obj, key, {\n      value: value,\n      enumerable: true,\n      configurable: true,\n      writable: true\n    });\n    return obj[key];\n  }\n  try {\n    // IE 8 has a broken Object.defineProperty that only works on DOM objects.\n    define({}, \"\");\n  } catch (err) {\n    define = function(obj, key, value) {\n      return obj[key] = value;\n    };\n  }\n\n  function wrap(innerFn, outerFn, self, tryLocsList) {\n    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.\n    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;\n    var generator = Object.create(protoGenerator.prototype);\n    var context = new Context(tryLocsList || []);\n\n    // The ._invoke method unifies the implementations of the .next,\n    // .throw, and .return methods.\n    generator._invoke = makeInvokeMethod(innerFn, self, context);\n\n    return generator;\n  }\n  exports.wrap = wrap;\n\n  // Try/catch helper to minimize deoptimizations. Returns a completion\n  // record like context.tryEntries[i].completion. This interface could\n  // have been (and was previously) designed to take a closure to be\n  // invoked without arguments, but in all the cases we care about we\n  // already have an existing method we want to call, so there's no need\n  // to create a new function object. We can even get away with assuming\n  // the method takes exactly one argument, since that happens to be true\n  // in every case, so we don't have to touch the arguments object. The\n  // only additional allocation required is the completion record, which\n  // has a stable shape and so hopefully should be cheap to allocate.\n  function tryCatch(fn, obj, arg) {\n    try {\n      return { type: \"normal\", arg: fn.call(obj, arg) };\n    } catch (err) {\n      return { type: \"throw\", arg: err };\n    }\n  }\n\n  var GenStateSuspendedStart = \"suspendedStart\";\n  var GenStateSuspendedYield = \"suspendedYield\";\n  var GenStateExecuting = \"executing\";\n  var GenStateCompleted = \"completed\";\n\n  // Returning this object from the innerFn has the same effect as\n  // breaking out of the dispatch switch statement.\n  var ContinueSentinel = {};\n\n  // Dummy constructor functions that we use as the .constructor and\n  // .constructor.prototype properties for functions that return Generator\n  // objects. For full spec compliance, you may wish to configure your\n  // minifier not to mangle the names of these two functions.\n  function Generator() {}\n  function GeneratorFunction() {}\n  function GeneratorFunctionPrototype() {}\n\n  // This is a polyfill for %IteratorPrototype% for environments that\n  // don't natively support it.\n  var IteratorPrototype = {};\n  IteratorPrototype[iteratorSymbol] = function () {\n    return this;\n  };\n\n  var getProto = Object.getPrototypeOf;\n  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));\n  if (NativeIteratorPrototype &&\n      NativeIteratorPrototype !== Op &&\n      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {\n    // This environment has a native %IteratorPrototype%; use it instead\n    // of the polyfill.\n    IteratorPrototype = NativeIteratorPrototype;\n  }\n\n  var Gp = GeneratorFunctionPrototype.prototype =\n    Generator.prototype = Object.create(IteratorPrototype);\n  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n  GeneratorFunctionPrototype.constructor = GeneratorFunction;\n  GeneratorFunction.displayName = define(\n    GeneratorFunctionPrototype,\n    toStringTagSymbol,\n    \"GeneratorFunction\"\n  );\n\n  // Helper for defining the .next, .throw, and .return methods of the\n  // Iterator interface in terms of a single ._invoke method.\n  function defineIteratorMethods(prototype) {\n    [\"next\", \"throw\", \"return\"].forEach(function(method) {\n      define(prototype, method, function(arg) {\n        return this._invoke(method, arg);\n      });\n    });\n  }\n\n  exports.isGeneratorFunction = function(genFun) {\n    var ctor = typeof genFun === \"function\" && genFun.constructor;\n    return ctor\n      ? ctor === GeneratorFunction ||\n        // For the native GeneratorFunction constructor, the best we can\n        // do is to check its .name property.\n        (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n      : false;\n  };\n\n  exports.mark = function(genFun) {\n    if (Object.setPrototypeOf) {\n      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);\n    } else {\n      genFun.__proto__ = GeneratorFunctionPrototype;\n      define(genFun, toStringTagSymbol, \"GeneratorFunction\");\n    }\n    genFun.prototype = Object.create(Gp);\n    return genFun;\n  };\n\n  // Within the body of any async function, `await x` is transformed to\n  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n  // `hasOwn.call(value, \"__await\")` to determine if the yielded value is\n  // meant to be awaited.\n  exports.awrap = function(arg) {\n    return { __await: arg };\n  };\n\n  function AsyncIterator(generator, PromiseImpl) {\n    function invoke(method, arg, resolve, reject) {\n      var record = tryCatch(generator[method], generator, arg);\n      if (record.type === \"throw\") {\n        reject(record.arg);\n      } else {\n        var result = record.arg;\n        var value = result.value;\n        if (value &&\n            typeof value === \"object\" &&\n            hasOwn.call(value, \"__await\")) {\n          return PromiseImpl.resolve(value.__await).then(function(value) {\n            invoke(\"next\", value, resolve, reject);\n          }, function(err) {\n            invoke(\"throw\", err, resolve, reject);\n          });\n        }\n\n        return PromiseImpl.resolve(value).then(function(unwrapped) {\n          // When a yielded Promise is resolved, its final value becomes\n          // the .value of the Promise<{value,done}> result for the\n          // current iteration.\n          result.value = unwrapped;\n          resolve(result);\n        }, function(error) {\n          // If a rejected Promise was yielded, throw the rejection back\n          // into the async generator function so it can be handled there.\n          return invoke(\"throw\", error, resolve, reject);\n        });\n      }\n    }\n\n    var previousPromise;\n\n    function enqueue(method, arg) {\n      function callInvokeWithMethodAndArg() {\n        return new PromiseImpl(function(resolve, reject) {\n          invoke(method, arg, resolve, reject);\n        });\n      }\n\n      return previousPromise =\n        // If enqueue has been called before, then we want to wait until\n        // all previous Promises have been resolved before calling invoke,\n        // so that results are always delivered in the correct order. If\n        // enqueue has not been called before, then it is important to\n        // call invoke immediately, without waiting on a callback to fire,\n        // so that the async generator function has the opportunity to do\n        // any necessary setup in a predictable way. This predictability\n        // is why the Promise constructor synchronously invokes its\n        // executor callback, and why async functions synchronously\n        // execute code before the first await. Since we implement simple\n        // async functions in terms of async generators, it is especially\n        // important to get this right, even though it requires care.\n        previousPromise ? previousPromise.then(\n          callInvokeWithMethodAndArg,\n          // Avoid propagating failures to Promises returned by later\n          // invocations of the iterator.\n          callInvokeWithMethodAndArg\n        ) : callInvokeWithMethodAndArg();\n    }\n\n    // Define the unified helper method that is used to implement .next,\n    // .throw, and .return (see defineIteratorMethods).\n    this._invoke = enqueue;\n  }\n\n  defineIteratorMethods(AsyncIterator.prototype);\n  AsyncIterator.prototype[asyncIteratorSymbol] = function () {\n    return this;\n  };\n  exports.AsyncIterator = AsyncIterator;\n\n  // Note that simple async functions are implemented on top of\n  // AsyncIterator objects; they just return a Promise for the value of\n  // the final result produced by the iterator.\n  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {\n    if (PromiseImpl === void 0) PromiseImpl = Promise;\n\n    var iter = new AsyncIterator(\n      wrap(innerFn, outerFn, self, tryLocsList),\n      PromiseImpl\n    );\n\n    return exports.isGeneratorFunction(outerFn)\n      ? iter // If outerFn is a generator, return the full iterator.\n      : iter.next().then(function(result) {\n          return result.done ? result.value : iter.next();\n        });\n  };\n\n  function makeInvokeMethod(innerFn, self, context) {\n    var state = GenStateSuspendedStart;\n\n    return function invoke(method, arg) {\n      if (state === GenStateExecuting) {\n        throw new Error(\"Generator is already running\");\n      }\n\n      if (state === GenStateCompleted) {\n        if (method === \"throw\") {\n          throw arg;\n        }\n\n        // Be forgiving, per 25.3.3.3.3 of the spec:\n        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n        return doneResult();\n      }\n\n      context.method = method;\n      context.arg = arg;\n\n      while (true) {\n        var delegate = context.delegate;\n        if (delegate) {\n          var delegateResult = maybeInvokeDelegate(delegate, context);\n          if (delegateResult) {\n            if (delegateResult === ContinueSentinel) continue;\n            return delegateResult;\n          }\n        }\n\n        if (context.method === \"next\") {\n          // Setting context._sent for legacy support of Babel's\n          // function.sent implementation.\n          context.sent = context._sent = context.arg;\n\n        } else if (context.method === \"throw\") {\n          if (state === GenStateSuspendedStart) {\n            state = GenStateCompleted;\n            throw context.arg;\n          }\n\n          context.dispatchException(context.arg);\n\n        } else if (context.method === \"return\") {\n          context.abrupt(\"return\", context.arg);\n        }\n\n        state = GenStateExecuting;\n\n        var record = tryCatch(innerFn, self, context);\n        if (record.type === \"normal\") {\n          // If an exception is thrown from innerFn, we leave state ===\n          // GenStateExecuting and loop back for another invocation.\n          state = context.done\n            ? GenStateCompleted\n            : GenStateSuspendedYield;\n\n          if (record.arg === ContinueSentinel) {\n            continue;\n          }\n\n          return {\n            value: record.arg,\n            done: context.done\n          };\n\n        } else if (record.type === \"throw\") {\n          state = GenStateCompleted;\n          // Dispatch the exception by looping back around to the\n          // context.dispatchException(context.arg) call above.\n          context.method = \"throw\";\n          context.arg = record.arg;\n        }\n      }\n    };\n  }\n\n  // Call delegate.iterator[context.method](context.arg) and handle the\n  // result, either by returning a { value, done } result from the\n  // delegate iterator, or by modifying context.method and context.arg,\n  // setting context.delegate to null, and returning the ContinueSentinel.\n  function maybeInvokeDelegate(delegate, context) {\n    var method = delegate.iterator[context.method];\n    if (method === undefined) {\n      // A .throw or .return when the delegate iterator has no .throw\n      // method always terminates the yield* loop.\n      context.delegate = null;\n\n      if (context.method === \"throw\") {\n        // Note: [\"return\"] must be used for ES3 parsing compatibility.\n        if (delegate.iterator[\"return\"]) {\n          // If the delegate iterator has a return method, give it a\n          // chance to clean up.\n          context.method = \"return\";\n          context.arg = undefined;\n          maybeInvokeDelegate(delegate, context);\n\n          if (context.method === \"throw\") {\n            // If maybeInvokeDelegate(context) changed context.method from\n            // \"return\" to \"throw\", let that override the TypeError below.\n            return ContinueSentinel;\n          }\n        }\n\n        context.method = \"throw\";\n        context.arg = new TypeError(\n          \"The iterator does not provide a 'throw' method\");\n      }\n\n      return ContinueSentinel;\n    }\n\n    var record = tryCatch(method, delegate.iterator, context.arg);\n\n    if (record.type === \"throw\") {\n      context.method = \"throw\";\n      context.arg = record.arg;\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    var info = record.arg;\n\n    if (! info) {\n      context.method = \"throw\";\n      context.arg = new TypeError(\"iterator result is not an object\");\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    if (info.done) {\n      // Assign the result of the finished delegate to the temporary\n      // variable specified by delegate.resultName (see delegateYield).\n      context[delegate.resultName] = info.value;\n\n      // Resume execution at the desired location (see delegateYield).\n      context.next = delegate.nextLoc;\n\n      // If context.method was \"throw\" but the delegate handled the\n      // exception, let the outer generator proceed normally. If\n      // context.method was \"next\", forget context.arg since it has been\n      // \"consumed\" by the delegate iterator. If context.method was\n      // \"return\", allow the original .return call to continue in the\n      // outer generator.\n      if (context.method !== \"return\") {\n        context.method = \"next\";\n        context.arg = undefined;\n      }\n\n    } else {\n      // Re-yield the result returned by the delegate method.\n      return info;\n    }\n\n    // The delegate iterator is finished, so forget it and continue with\n    // the outer generator.\n    context.delegate = null;\n    return ContinueSentinel;\n  }\n\n  // Define Generator.prototype.{next,throw,return} in terms of the\n  // unified ._invoke helper method.\n  defineIteratorMethods(Gp);\n\n  define(Gp, toStringTagSymbol, \"Generator\");\n\n  // A Generator should always return itself as the iterator object when the\n  // @@iterator function is called on it. Some browsers' implementations of the\n  // iterator prototype chain incorrectly implement this, causing the Generator\n  // object to not be returned from this call. This ensures that doesn't happen.\n  // See https://github.com/facebook/regenerator/issues/274 for more details.\n  Gp[iteratorSymbol] = function() {\n    return this;\n  };\n\n  Gp.toString = function() {\n    return \"[object Generator]\";\n  };\n\n  function pushTryEntry(locs) {\n    var entry = { tryLoc: locs[0] };\n\n    if (1 in locs) {\n      entry.catchLoc = locs[1];\n    }\n\n    if (2 in locs) {\n      entry.finallyLoc = locs[2];\n      entry.afterLoc = locs[3];\n    }\n\n    this.tryEntries.push(entry);\n  }\n\n  function resetTryEntry(entry) {\n    var record = entry.completion || {};\n    record.type = \"normal\";\n    delete record.arg;\n    entry.completion = record;\n  }\n\n  function Context(tryLocsList) {\n    // The root entry object (effectively a try statement without a catch\n    // or a finally block) gives us a place to store values thrown from\n    // locations where there is no enclosing try statement.\n    this.tryEntries = [{ tryLoc: \"root\" }];\n    tryLocsList.forEach(pushTryEntry, this);\n    this.reset(true);\n  }\n\n  exports.keys = function(object) {\n    var keys = [];\n    for (var key in object) {\n      keys.push(key);\n    }\n    keys.reverse();\n\n    // Rather than returning an object with a next method, we keep\n    // things simple and return the next function itself.\n    return function next() {\n      while (keys.length) {\n        var key = keys.pop();\n        if (key in object) {\n          next.value = key;\n          next.done = false;\n          return next;\n        }\n      }\n\n      // To avoid creating an additional object, we just hang the .value\n      // and .done properties off the next function object itself. This\n      // also ensures that the minifier will not anonymize the function.\n      next.done = true;\n      return next;\n    };\n  };\n\n  function values(iterable) {\n    if (iterable) {\n      var iteratorMethod = iterable[iteratorSymbol];\n      if (iteratorMethod) {\n        return iteratorMethod.call(iterable);\n      }\n\n      if (typeof iterable.next === \"function\") {\n        return iterable;\n      }\n\n      if (!isNaN(iterable.length)) {\n        var i = -1, next = function next() {\n          while (++i < iterable.length) {\n            if (hasOwn.call(iterable, i)) {\n              next.value = iterable[i];\n              next.done = false;\n              return next;\n            }\n          }\n\n          next.value = undefined;\n          next.done = true;\n\n          return next;\n        };\n\n        return next.next = next;\n      }\n    }\n\n    // Return an iterator with no values.\n    return { next: doneResult };\n  }\n  exports.values = values;\n\n  function doneResult() {\n    return { value: undefined, done: true };\n  }\n\n  Context.prototype = {\n    constructor: Context,\n\n    reset: function(skipTempReset) {\n      this.prev = 0;\n      this.next = 0;\n      // Resetting context._sent for legacy support of Babel's\n      // function.sent implementation.\n      this.sent = this._sent = undefined;\n      this.done = false;\n      this.delegate = null;\n\n      this.method = \"next\";\n      this.arg = undefined;\n\n      this.tryEntries.forEach(resetTryEntry);\n\n      if (!skipTempReset) {\n        for (var name in this) {\n          // Not sure about the optimal order of these conditions:\n          if (name.charAt(0) === \"t\" &&\n              hasOwn.call(this, name) &&\n              !isNaN(+name.slice(1))) {\n            this[name] = undefined;\n          }\n        }\n      }\n    },\n\n    stop: function() {\n      this.done = true;\n\n      var rootEntry = this.tryEntries[0];\n      var rootRecord = rootEntry.completion;\n      if (rootRecord.type === \"throw\") {\n        throw rootRecord.arg;\n      }\n\n      return this.rval;\n    },\n\n    dispatchException: function(exception) {\n      if (this.done) {\n        throw exception;\n      }\n\n      var context = this;\n      function handle(loc, caught) {\n        record.type = \"throw\";\n        record.arg = exception;\n        context.next = loc;\n\n        if (caught) {\n          // If the dispatched exception was caught by a catch block,\n          // then let that catch block handle the exception normally.\n          context.method = \"next\";\n          context.arg = undefined;\n        }\n\n        return !! caught;\n      }\n\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        var record = entry.completion;\n\n        if (entry.tryLoc === \"root\") {\n          // Exception thrown outside of any try block that could handle\n          // it, so set the completion value of the entire function to\n          // throw the exception.\n          return handle(\"end\");\n        }\n\n        if (entry.tryLoc <= this.prev) {\n          var hasCatch = hasOwn.call(entry, \"catchLoc\");\n          var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n          if (hasCatch && hasFinally) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            } else if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else if (hasCatch) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            }\n\n          } else if (hasFinally) {\n            if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else {\n            throw new Error(\"try statement without catch or finally\");\n          }\n        }\n      }\n    },\n\n    abrupt: function(type, arg) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc <= this.prev &&\n            hasOwn.call(entry, \"finallyLoc\") &&\n            this.prev < entry.finallyLoc) {\n          var finallyEntry = entry;\n          break;\n        }\n      }\n\n      if (finallyEntry &&\n          (type === \"break\" ||\n           type === \"continue\") &&\n          finallyEntry.tryLoc <= arg &&\n          arg <= finallyEntry.finallyLoc) {\n        // Ignore the finally entry if control is not jumping to a\n        // location outside the try/catch block.\n        finallyEntry = null;\n      }\n\n      var record = finallyEntry ? finallyEntry.completion : {};\n      record.type = type;\n      record.arg = arg;\n\n      if (finallyEntry) {\n        this.method = \"next\";\n        this.next = finallyEntry.finallyLoc;\n        return ContinueSentinel;\n      }\n\n      return this.complete(record);\n    },\n\n    complete: function(record, afterLoc) {\n      if (record.type === \"throw\") {\n        throw record.arg;\n      }\n\n      if (record.type === \"break\" ||\n          record.type === \"continue\") {\n        this.next = record.arg;\n      } else if (record.type === \"return\") {\n        this.rval = this.arg = record.arg;\n        this.method = \"return\";\n        this.next = \"end\";\n      } else if (record.type === \"normal\" && afterLoc) {\n        this.next = afterLoc;\n      }\n\n      return ContinueSentinel;\n    },\n\n    finish: function(finallyLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.finallyLoc === finallyLoc) {\n          this.complete(entry.completion, entry.afterLoc);\n          resetTryEntry(entry);\n          return ContinueSentinel;\n        }\n      }\n    },\n\n    \"catch\": function(tryLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc === tryLoc) {\n          var record = entry.completion;\n          if (record.type === \"throw\") {\n            var thrown = record.arg;\n            resetTryEntry(entry);\n          }\n          return thrown;\n        }\n      }\n\n      // The context.catch method must only be called with a location\n      // argument that corresponds to a known catch block.\n      throw new Error(\"illegal catch attempt\");\n    },\n\n    delegateYield: function(iterable, resultName, nextLoc) {\n      this.delegate = {\n        iterator: values(iterable),\n        resultName: resultName,\n        nextLoc: nextLoc\n      };\n\n      if (this.method === \"next\") {\n        // Deliberately forget the last sent value so that we don't\n        // accidentally pass it on to the delegate.\n        this.arg = undefined;\n      }\n\n      return ContinueSentinel;\n    }\n  };\n\n  // Regardless of whether this script is executing as a CommonJS module\n  // or not, return the runtime object so that we can declare the variable\n  // regeneratorRuntime in the outer scope, which allows this module to be\n  // injected easily by `bin/regenerator --include-runtime script.js`.\n  return exports;\n\n}(\n  // If this script is executing as a CommonJS module, use module.exports\n  // as the regeneratorRuntime namespace. Otherwise create a new empty\n  // object. Either way, the resulting object will be used to initialize\n  // the regeneratorRuntime variable at the top of this file.\n  typeof module === \"object\" ? module.exports : {}\n));\n\ntry {\n  regeneratorRuntime = runtime;\n} catch (accidentalStrictMode) {\n  // This module should not be running in strict mode, so the above\n  // assignment should always work unless something is misconfigured. Just\n  // in case runtime.js accidentally runs in strict mode, we can escape\n  // strict mode using a global Function call. This could conceivably fail\n  // if a Content Security Policy forbids using Function, but in that case\n  // the proper solution is to fix the accidental strict mode problem. If\n  // you've misconfigured your bundler to force strict mode and applied a\n  // CSP to forbid Function, and you're not willing to fix either of those\n  // problems, please detail your unique predicament in a GitHub issue.\n  Function(\"r\", \"regeneratorRuntime = r\")(runtime);\n}\n","import { SLIDES_SELECTOR } from '../utils/constants.js'\nimport { queryAll, createStyleSheet } from '../utils/util.js'\n\n/**\n * Setups up our presentation for printing/exporting to PDF.\n */\nexport default class Print {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Configures the presentation for printing to a static\n\t * PDF.\n\t */\n\tasync setupPDF() {\n\n\t\tconst config = this.Reveal.getConfig();\n\t\tconst slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )\n\n\t\t// Compute slide numbers now, before we start duplicating slides\n\t\tconst injectPageNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );\n\n\t\tconst slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );\n\n\t\t// Dimensions of the PDF pages\n\t\tconst pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),\n\t\t\tpageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );\n\n\t\t// Dimensions of slides within the pages\n\t\tconst slideWidth = slideSize.width,\n\t\t\tslideHeight = slideSize.height;\n\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\t// Let the browser know what page size we want to print\n\t\tcreateStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );\n\n\t\t// Limit the size of certain elements to the dimensions of the slide\n\t\tcreateStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );\n\n\t\tdocument.documentElement.classList.add( 'print-pdf' );\n\t\tdocument.body.style.width = pageWidth + 'px';\n\t\tdocument.body.style.height = pageHeight + 'px';\n\n\t\tconst viewportElement = document.querySelector( '.reveal-viewport' );\n\t\tlet presentationBackground;\n\t\tif( viewportElement ) {\n\t\t\tconst viewportStyles = window.getComputedStyle( viewportElement );\n\t\t\tif( viewportStyles && viewportStyles.background ) {\n\t\t\t\tpresentationBackground = viewportStyles.background;\n\t\t\t}\n\t\t}\n\n\t\t// Make sure stretch elements fit on slide\n\t\tawait new Promise( requestAnimationFrame );\n\t\tthis.Reveal.layoutSlideContents( slideWidth, slideHeight );\n\n\t\t// Batch scrollHeight access to prevent layout thrashing\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\tconst slideScrollHeights = slides.map( slide => slide.scrollHeight );\n\n\t\tconst pages = [];\n\t\tconst pageContainer = slides[0].parentNode;\n\t\tlet slideNumber = 1;\n\n\t\t// Slide and slide background layout\n\t\tslides.forEach( function( slide, index ) {\n\n\t\t\t// Vertical stacks are not centred since their section\n\t\t\t// children will be\n\t\t\tif( slide.classList.contains( 'stack' ) === false ) {\n\t\t\t\t// Center the slide inside of the page, giving the slide some margin\n\t\t\t\tlet left = ( pageWidth - slideWidth ) / 2;\n\t\t\t\tlet top = ( pageHeight - slideHeight ) / 2;\n\n\t\t\t\tconst contentHeight = slideScrollHeights[ index ];\n\t\t\t\tlet numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );\n\n\t\t\t\t// Adhere to configured pages per slide limit\n\t\t\t\tnumberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );\n\n\t\t\t\t// Center slides vertically\n\t\t\t\tif( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {\n\t\t\t\t\ttop = Math.max( ( pageHeight - contentHeight ) / 2, 0 );\n\t\t\t\t}\n\n\t\t\t\t// Wrap the slide in a page element and hide its overflow\n\t\t\t\t// so that no page ever flows onto another\n\t\t\t\tconst page = document.createElement( 'div' );\n\t\t\t\tpages.push( page );\n\n\t\t\t\tpage.className = 'pdf-page';\n\t\t\t\tpage.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';\n\n\t\t\t\t// Copy the presentation-wide background to each individual\n\t\t\t\t// page when printing\n\t\t\t\tif( presentationBackground ) {\n\t\t\t\t\tpage.style.background = presentationBackground;\n\t\t\t\t}\n\n\t\t\t\tpage.appendChild( slide );\n\n\t\t\t\t// Position the slide inside of the page\n\t\t\t\tslide.style.left = left + 'px';\n\t\t\t\tslide.style.top = top + 'px';\n\t\t\t\tslide.style.width = slideWidth + 'px';\n\n\t\t\t\t// Re-run the slide layout so that r-fit-text is applied based on\n\t\t\t\t// the printed slide size\n\t\t\t\tthis.Reveal.slideContent.layout( slide )\n\n\t\t\t\tif( slide.slideBackgroundElement ) {\n\t\t\t\t\tpage.insertBefore( slide.slideBackgroundElement, slide );\n\t\t\t\t}\n\n\t\t\t\t// Inject notes if `showNotes` is enabled\n\t\t\t\tif( config.showNotes ) {\n\n\t\t\t\t\t// Are there notes for this slide?\n\t\t\t\t\tconst notes = this.Reveal.getSlideNotes( slide );\n\t\t\t\t\tif( notes ) {\n\n\t\t\t\t\t\tconst notesSpacing = 8;\n\t\t\t\t\t\tconst notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';\n\t\t\t\t\t\tconst notesElement = document.createElement( 'div' );\n\t\t\t\t\t\tnotesElement.classList.add( 'speaker-notes' );\n\t\t\t\t\t\tnotesElement.classList.add( 'speaker-notes-pdf' );\n\t\t\t\t\t\tnotesElement.setAttribute( 'data-layout', notesLayout );\n\t\t\t\t\t\tnotesElement.innerHTML = notes;\n\n\t\t\t\t\t\tif( notesLayout === 'separate-page' ) {\n\t\t\t\t\t\t\tpages.push( notesElement );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tnotesElement.style.left = notesSpacing + 'px';\n\t\t\t\t\t\t\tnotesElement.style.bottom = notesSpacing + 'px';\n\t\t\t\t\t\t\tnotesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';\n\t\t\t\t\t\t\tpage.appendChild( notesElement );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\t// Inject page numbers if `slideNumbers` are enabled\n\t\t\t\tif( injectPageNumbers ) {\n\t\t\t\t\tconst numberElement = document.createElement( 'div' );\n\t\t\t\t\tnumberElement.classList.add( 'slide-number' );\n\t\t\t\t\tnumberElement.classList.add( 'slide-number-pdf' );\n\t\t\t\t\tnumberElement.innerHTML = slideNumber++;\n\t\t\t\t\tpage.appendChild( numberElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy page and show fragments one after another\n\t\t\t\tif( config.pdfSeparateFragments ) {\n\n\t\t\t\t\t// Each fragment 'group' is an array containing one or more\n\t\t\t\t\t// fragments. Multiple fragments that appear at the same time\n\t\t\t\t\t// are part of the same group.\n\t\t\t\t\tconst fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );\n\n\t\t\t\t\tlet previousFragmentStep;\n\n\t\t\t\t\tfragmentGroups.forEach( function( fragments, index ) {\n\n\t\t\t\t\t\t// Remove 'current-fragment' from the previous group\n\t\t\t\t\t\tif( previousFragmentStep ) {\n\t\t\t\t\t\t\tpreviousFragmentStep.forEach( function( fragment ) {\n\t\t\t\t\t\t\t\tfragment.classList.remove( 'current-fragment' );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\t// Show the fragments for the current index\n\t\t\t\t\t\tfragments.forEach( function( fragment ) {\n\t\t\t\t\t\t\tfragment.classList.add( 'visible', 'current-fragment' );\n\t\t\t\t\t\t}, this );\n\n\t\t\t\t\t\t// Create a separate page for the current fragment state\n\t\t\t\t\t\tconst clonedPage = page.cloneNode( true );\n\n\t\t\t\t\t\t// Inject unique page numbers for fragments\n\t\t\t\t\t\tif( injectPageNumbers ) {\n\t\t\t\t\t\t\tconst numberElement = clonedPage.querySelector( '.slide-number-pdf' );\n\t\t\t\t\t\t\tconst fragmentNumber = index + 1;\n\t\t\t\t\t\t\tnumberElement.innerHTML += '.' + fragmentNumber;\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tpages.push( clonedPage );\n\n\t\t\t\t\t\tpreviousFragmentStep = fragments;\n\n\t\t\t\t\t}, this );\n\n\t\t\t\t\t// Reset the first/original page so that all fragments are hidden\n\t\t\t\t\tfragmentGroups.forEach( function( fragments ) {\n\t\t\t\t\t\tfragments.forEach( function( fragment ) {\n\t\t\t\t\t\t\tfragment.classList.remove( 'visible', 'current-fragment' );\n\t\t\t\t\t\t} );\n\t\t\t\t\t} );\n\n\t\t\t\t}\n\t\t\t\t// Show all fragments\n\t\t\t\telse {\n\t\t\t\t\tqueryAll( page, '.fragment:not(.fade-out)' ).forEach( function( fragment ) {\n\t\t\t\t\t\tfragment.classList.add( 'visible' );\n\t\t\t\t\t} );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}, this );\n\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\tpages.forEach( page => pageContainer.appendChild( page ) );\n\n\t\t// Notify subscribers that the PDF layout is good to go\n\t\tthis.Reveal.dispatchEvent({ type: 'pdf-ready' });\n\n\t}\n\n\t/**\n\t * Checks if this instance is being used to print a PDF.\n\t */\n\tisPrintingPDF() {\n\n\t\treturn ( /print-pdf/gi ).test( window.location.search );\n\n\t}\n\n}\n","import { isAndroid } from '../utils/device.js'\nimport { matches } from '../utils/util.js'\n\nconst SWIPE_THRESHOLD = 40;\n\n/**\n * Controls all touch interactions and navigations for\n * a presentation.\n */\nexport default class Touch {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Holds information about the currently ongoing touch interaction\n\t\tthis.touchStartX = 0;\n\t\tthis.touchStartY = 0;\n\t\tthis.touchStartCount = 0;\n\t\tthis.touchCaptured = false;\n\n\t\tthis.onPointerDown = this.onPointerDown.bind( this );\n\t\tthis.onPointerMove = this.onPointerMove.bind( this );\n\t\tthis.onPointerUp = this.onPointerUp.bind( this );\n\t\tthis.onTouchStart = this.onTouchStart.bind( this );\n\t\tthis.onTouchMove = this.onTouchMove.bind( this );\n\t\tthis.onTouchEnd = this.onTouchEnd.bind( this );\n\n\t}\n\n\t/**\n\t *\n\t */\n\tbind() {\n\n\t\tlet revealElement = this.Reveal.getRevealElement();\n\n\t\tif( 'onpointerdown' in window ) {\n\t\t\t// Use W3C pointer events\n\t\t\trevealElement.addEventListener( 'pointerdown', this.onPointerDown, false );\n\t\t\trevealElement.addEventListener( 'pointermove', this.onPointerMove, false );\n\t\t\trevealElement.addEventListener( 'pointerup', this.onPointerUp, false );\n\t\t}\n\t\telse if( window.navigator.msPointerEnabled ) {\n\t\t\t// IE 10 uses prefixed version of pointer events\n\t\t\trevealElement.addEventListener( 'MSPointerDown', this.onPointerDown, false );\n\t\t\trevealElement.addEventListener( 'MSPointerMove', this.onPointerMove, false );\n\t\t\trevealElement.addEventListener( 'MSPointerUp', this.onPointerUp, false );\n\t\t}\n\t\telse {\n\t\t\t// Fall back to touch events\n\t\t\trevealElement.addEventListener( 'touchstart', this.onTouchStart, false );\n\t\t\trevealElement.addEventListener( 'touchmove', this.onTouchMove, false );\n\t\t\trevealElement.addEventListener( 'touchend', this.onTouchEnd, false );\n\t\t}\n\n\t}\n\n\t/**\n\t *\n\t */\n\tunbind() {\n\n\t\tlet revealElement = this.Reveal.getRevealElement();\n\n\t\trevealElement.removeEventListener( 'pointerdown', this.onPointerDown, false );\n\t\trevealElement.removeEventListener( 'pointermove', this.onPointerMove, false );\n\t\trevealElement.removeEventListener( 'pointerup', this.onPointerUp, false );\n\n\t\trevealElement.removeEventListener( 'MSPointerDown', this.onPointerDown, false );\n\t\trevealElement.removeEventListener( 'MSPointerMove', this.onPointerMove, false );\n\t\trevealElement.removeEventListener( 'MSPointerUp', this.onPointerUp, false );\n\n\t\trevealElement.removeEventListener( 'touchstart', this.onTouchStart, false );\n\t\trevealElement.removeEventListener( 'touchmove', this.onTouchMove, false );\n\t\trevealElement.removeEventListener( 'touchend', this.onTouchEnd, false );\n\n\t}\n\n\t/**\n\t * Checks if the target element prevents the triggering of\n\t * swipe navigation.\n\t */\n\tisSwipePrevented( target ) {\n\n\t\t// Prevent accidental swipes when scrubbing timelines\n\t\tif( matches( target, 'video, audio' ) ) return true;\n\n\t\twhile( target && typeof target.hasAttribute === 'function' ) {\n\t\t\tif( target.hasAttribute( 'data-prevent-swipe' ) ) return true;\n\t\t\ttarget = target.parentNode;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Handler for the 'touchstart' event, enables support for\n\t * swipe and pinch gestures.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchStart( event ) {\n\n\t\tif( this.isSwipePrevented( event.target ) ) return true;\n\n\t\tthis.touchStartX = event.touches[0].clientX;\n\t\tthis.touchStartY = event.touches[0].clientY;\n\t\tthis.touchStartCount = event.touches.length;\n\n\t}\n\n\t/**\n\t * Handler for the 'touchmove' event.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchMove( event ) {\n\n\t\tif( this.isSwipePrevented( event.target ) ) return true;\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\t// Each touch should only trigger one action\n\t\tif( !this.touchCaptured ) {\n\t\t\tthis.Reveal.onUserInput( event );\n\n\t\t\tlet currentX = event.touches[0].clientX;\n\t\t\tlet currentY = event.touches[0].clientY;\n\n\t\t\t// There was only one touch point, look for a swipe\n\t\t\tif( event.touches.length === 1 && this.touchStartCount !== 2 ) {\n\n\t\t\t\tlet availableRoutes = this.Reveal.availableRoutes({ includeFragments: true });\n\n\t\t\t\tlet deltaX = currentX - this.touchStartX,\n\t\t\t\t\tdeltaY = currentY - this.touchStartY;\n\n\t\t\t\tif( deltaX > SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tif( config.rtl ) {\n\t\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.left();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaX < -SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tif( config.rtl ) {\n\t\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.right();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaY > SWIPE_THRESHOLD && availableRoutes.up ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.up();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaY < -SWIPE_THRESHOLD && availableRoutes.down ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.down();\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// If we're embedded, only block touch events if they have\n\t\t\t\t// triggered an action\n\t\t\t\tif( config.embedded ) {\n\t\t\t\t\tif( this.touchCaptured || this.Reveal.isVerticalSlide() ) {\n\t\t\t\t\t\tevent.preventDefault();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Not embedded? Block them all to avoid needless tossing\n\t\t\t\t// around of the viewport in iOS\n\t\t\t\telse {\n\t\t\t\t\tevent.preventDefault();\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\t\t// There's a bug with swiping on some Android devices unless\n\t\t// the default action is always prevented\n\t\telse if( isAndroid ) {\n\t\t\tevent.preventDefault();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the 'touchend' event.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchEnd( event ) {\n\n\t\tthis.touchCaptured = false;\n\n\t}\n\n\t/**\n\t * Convert pointer down to touch start.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerDown( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" ) {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchStart( event );\n\t\t}\n\n\t}\n\n\t/**\n\t * Convert pointer move to touch move.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerMove( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" )  {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchMove( event );\n\t\t}\n\n\t}\n\n\t/**\n\t * Convert pointer up to touch end.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerUp( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" )  {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchEnd( event );\n\t\t}\n\n\t}\n\n}","import { closest } from '../utils/util.js'\n\n/**\n * Manages focus when a presentation is embedded. This\n * helps us only capture keyboard from the presentation\n * a user is currently interacting with in a page where\n * multiple presentations are embedded.\n */\n\nconst STATE_FOCUS = 'focus';\nconst STATE_BLUR = 'blur';\n\nexport default class Focus {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onRevealPointerDown = this.onRevealPointerDown.bind( this );\n\t\tthis.onDocumentPointerDown = this.onDocumentPointerDown.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.embedded ) {\n\t\t\tthis.blur();\n\t\t}\n\t\telse {\n\t\t\tthis.focus();\n\t\t\tthis.unbind();\n\t\t}\n\n\t}\n\n\tbind() {\n\n\t\tif( this.Reveal.getConfig().embedded ) {\n\t\t\tthis.Reveal.getRevealElement().addEventListener( 'pointerdown', this.onRevealPointerDown, false );\n\t\t}\n\n\t}\n\n\tunbind() {\n\n\t\tthis.Reveal.getRevealElement().removeEventListener( 'pointerdown', this.onRevealPointerDown, false );\n\t\tdocument.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\n\t}\n\n\tfocus() {\n\n\t\tif( this.state !== STATE_FOCUS ) {\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'focused' );\n\t\t\tdocument.addEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\t\t}\n\n\t\tthis.state = STATE_FOCUS;\n\n\t}\n\n\tblur() {\n\n\t\tif( this.state !== STATE_BLUR ) {\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'focused' );\n\t\t\tdocument.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\t\t}\n\n\t\tthis.state = STATE_BLUR;\n\n\t}\n\n\tisFocused() {\n\n\t\treturn this.state === STATE_FOCUS;\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.Reveal.getRevealElement().classList.remove( 'focused' );\n\n\t}\n\n\tonRevealPointerDown( event ) {\n\n\t\tthis.focus();\n\n\t}\n\n\tonDocumentPointerDown( event ) {\n\n\t\tlet revealElement = closest( event.target, '.reveal' );\n\t\tif( !revealElement || revealElement !== this.Reveal.getRevealElement() ) {\n\t\t\tthis.blur();\n\t\t}\n\n\t}\n\n}","/**\n * Handles the showing and \n */\nexport default class Notes {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'speaker-notes';\n\t\tthis.element.setAttribute( 'data-prevent-swipe', '' );\n\t\tthis.element.setAttribute( 'tabindex', '0' );\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.showNotes ) {\n\t\t\tthis.element.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Pick up notes from the current slide and display them\n\t * to the viewer.\n\t *\n\t * @see {@link config.showNotes}\n\t */\n\tupdate() {\n\n\t\tif( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) {\n\n\t\t\tthis.element.innerHTML = this.getSlideNotes() || '<span class=\"notes-placeholder\">No notes on this slide.</span>';\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the visibility of the speaker notes sidebar that\n\t * is used to share annotated slides. The notes sidebar is\n\t * only visible if showNotes is true and there are notes on\n\t * one or more slides in the deck.\n\t */\n\tupdateVisibility() {\n\n\t\tif( this.Reveal.getConfig().showNotes && this.hasNotes() && !this.Reveal.print.isPrintingPDF() ) {\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'show-notes' );\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'show-notes' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if there are speaker notes for ANY slide in the\n\t * presentation.\n\t */\n\thasNotes() {\n\n\t\treturn this.Reveal.getSlidesElement().querySelectorAll( '[data-notes], aside.notes' ).length > 0;\n\n\t}\n\n\t/**\n\t * Checks if this presentation is running inside of the\n\t * speaker notes window.\n\t *\n\t * @return {boolean}\n\t */\n\tisSpeakerNotesWindow() {\n\n\t\treturn !!window.location.search.match( /receiver/gi );\n\n\t}\n\n\t/**\n\t * Retrieves the speaker notes from a slide. Notes can be\n\t * defined in two ways:\n\t * 1. As a data-notes attribute on the slide <section>\n\t * 2. As an <aside class=\"notes\"> inside of the slide\n\t *\n\t * @param {HTMLElement} [slide=currentSlide]\n\t * @return {(string|null)}\n\t */\n\tgetSlideNotes( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\t// Notes can be specified via the data-notes attribute...\n\t\tif( slide.hasAttribute( 'data-notes' ) ) {\n\t\t\treturn slide.getAttribute( 'data-notes' );\n\t\t}\n\n\t\t// ... or using an <aside class=\"notes\"> element\n\t\tlet notesElement = slide.querySelector( 'aside.notes' );\n\t\tif( notesElement ) {\n\t\t\treturn notesElement.innerHTML;\n\t\t}\n\n\t\treturn null;\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","'use strict';\nvar toObject = require('../internals/to-object');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\nvar toLength = require('../internals/to-length');\n\n// `Array.prototype.fill` method implementation\n// https://tc39.es/ecma262/#sec-array.prototype.fill\nmodule.exports = function fill(value /* , start = 0, end = @length */) {\n  var O = toObject(this);\n  var length = toLength(O.length);\n  var argumentsLength = arguments.length;\n  var index = toAbsoluteIndex(argumentsLength > 1 ? arguments[1] : undefined, length);\n  var end = argumentsLength > 2 ? arguments[2] : undefined;\n  var endPos = end === undefined ? length : toAbsoluteIndex(end, length);\n  while (endPos > index) O[index++] = value;\n  return O;\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\nvar create = require('../internals/object-create');\nvar definePropertyModule = require('../internals/object-define-property');\n\nvar UNSCOPABLES = wellKnownSymbol('unscopables');\nvar ArrayPrototype = Array.prototype;\n\n// Array.prototype[@@unscopables]\n// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables\nif (ArrayPrototype[UNSCOPABLES] == undefined) {\n  definePropertyModule.f(ArrayPrototype, UNSCOPABLES, {\n    configurable: true,\n    value: create(null)\n  });\n}\n\n// add a key to Array.prototype[@@unscopables]\nmodule.exports = function (key) {\n  ArrayPrototype[UNSCOPABLES][key] = true;\n};\n","var $ = require('../internals/export');\nvar fill = require('../internals/array-fill');\nvar addToUnscopables = require('../internals/add-to-unscopables');\n\n// `Array.prototype.fill` method\n// https://tc39.es/ecma262/#sec-array.prototype.fill\n$({ target: 'Array', proto: true }, {\n  fill: fill\n});\n\n// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables\naddToUnscopables('fill');\n","/**\n * UI component that lets the use control auto-slide\n * playback via play/pause.\n */\nexport default class Playback {\n\n\t/**\n\t * @param {HTMLElement} container The component will append\n\t * itself to this\n\t * @param {function} progressCheck A method which will be\n\t * called frequently to get the current playback progress on\n\t * a range of 0-1\n\t */\n\tconstructor( container, progressCheck ) {\n\n\t\t// Cosmetics\n\t\tthis.diameter = 100;\n\t\tthis.diameter2 = this.diameter/2;\n\t\tthis.thickness = 6;\n\n\t\t// Flags if we are currently playing\n\t\tthis.playing = false;\n\n\t\t// Current progress on a 0-1 range\n\t\tthis.progress = 0;\n\n\t\t// Used to loop the animation smoothly\n\t\tthis.progressOffset = 1;\n\n\t\tthis.container = container;\n\t\tthis.progressCheck = progressCheck;\n\n\t\tthis.canvas = document.createElement( 'canvas' );\n\t\tthis.canvas.className = 'playback';\n\t\tthis.canvas.width = this.diameter;\n\t\tthis.canvas.height = this.diameter;\n\t\tthis.canvas.style.width = this.diameter2 + 'px';\n\t\tthis.canvas.style.height = this.diameter2 + 'px';\n\t\tthis.context = this.canvas.getContext( '2d' );\n\n\t\tthis.container.appendChild( this.canvas );\n\n\t\tthis.render();\n\n\t}\n\n\tsetPlaying( value ) {\n\n\t\tconst wasPlaying = this.playing;\n\n\t\tthis.playing = value;\n\n\t\t// Start repainting if we weren't already\n\t\tif( !wasPlaying && this.playing ) {\n\t\t\tthis.animate();\n\t\t}\n\t\telse {\n\t\t\tthis.render();\n\t\t}\n\n\t}\n\n\tanimate() {\n\n\t\tconst progressBefore = this.progress;\n\n\t\tthis.progress = this.progressCheck();\n\n\t\t// When we loop, offset the progress so that it eases\n\t\t// smoothly rather than immediately resetting\n\t\tif( progressBefore > 0.8 && this.progress < 0.2 ) {\n\t\t\tthis.progressOffset = this.progress;\n\t\t}\n\n\t\tthis.render();\n\n\t\tif( this.playing ) {\n\t\t\trequestAnimationFrame( this.animate.bind( this ) );\n\t\t}\n\n\t}\n\n\t/**\n\t * Renders the current progress and playback state.\n\t */\n\trender() {\n\n\t\tlet progress = this.playing ? this.progress : 0,\n\t\t\tradius = ( this.diameter2 ) - this.thickness,\n\t\t\tx = this.diameter2,\n\t\t\ty = this.diameter2,\n\t\t\ticonSize = 28;\n\n\t\t// Ease towards 1\n\t\tthis.progressOffset += ( 1 - this.progressOffset ) * 0.1;\n\n\t\tconst endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );\n\t\tconst startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );\n\n\t\tthis.context.save();\n\t\tthis.context.clearRect( 0, 0, this.diameter, this.diameter );\n\n\t\t// Solid background color\n\t\tthis.context.beginPath();\n\t\tthis.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );\n\t\tthis.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';\n\t\tthis.context.fill();\n\n\t\t// Draw progress track\n\t\tthis.context.beginPath();\n\t\tthis.context.arc( x, y, radius, 0, Math.PI * 2, false );\n\t\tthis.context.lineWidth = this.thickness;\n\t\tthis.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';\n\t\tthis.context.stroke();\n\n\t\tif( this.playing ) {\n\t\t\t// Draw progress on top of track\n\t\t\tthis.context.beginPath();\n\t\t\tthis.context.arc( x, y, radius, startAngle, endAngle, false );\n\t\t\tthis.context.lineWidth = this.thickness;\n\t\t\tthis.context.strokeStyle = '#fff';\n\t\t\tthis.context.stroke();\n\t\t}\n\n\t\tthis.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );\n\n\t\t// Draw play/pause icons\n\t\tif( this.playing ) {\n\t\t\tthis.context.fillStyle = '#fff';\n\t\t\tthis.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );\n\t\t\tthis.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );\n\t\t}\n\t\telse {\n\t\t\tthis.context.beginPath();\n\t\t\tthis.context.translate( 4, 0 );\n\t\t\tthis.context.moveTo( 0, 0 );\n\t\t\tthis.context.lineTo( iconSize - 4, iconSize / 2 );\n\t\t\tthis.context.lineTo( 0, iconSize );\n\t\t\tthis.context.fillStyle = '#fff';\n\t\t\tthis.context.fill();\n\t\t}\n\n\t\tthis.context.restore();\n\n\t}\n\n\ton( type, listener ) {\n\t\tthis.canvas.addEventListener( type, listener, false );\n\t}\n\n\toff( type, listener ) {\n\t\tthis.canvas.removeEventListener( type, listener, false );\n\t}\n\n\tdestroy() {\n\n\t\tthis.playing = false;\n\n\t\tif( this.canvas.parentNode ) {\n\t\t\tthis.container.removeChild( this.canvas );\n\t\t}\n\n\t}\n\n}","/**\n * The default reveal.js config object.\n */\nexport default {\n\n\t// The \"normal\" size of the presentation, aspect ratio will be preserved\n\t// when the presentation is scaled to fit different resolutions\n\twidth: 960,\n\theight: 700,\n\n\t// Factor of the display size that should remain empty around the content\n\tmargin: 0.04,\n\n\t// Bounds for smallest/largest possible scale to apply to content\n\tminScale: 0.2,\n\tmaxScale: 2.0,\n\n\t// Display presentation control arrows\n\tcontrols: true,\n\n\t// Help the user learn the controls by providing hints, for example by\n\t// bouncing the down arrow when they first encounter a vertical slide\n\tcontrolsTutorial: true,\n\n\t// Determines where controls appear, \"edges\" or \"bottom-right\"\n\tcontrolsLayout: 'bottom-right',\n\n\t// Visibility rule for backwards navigation arrows; \"faded\", \"hidden\"\n\t// or \"visible\"\n\tcontrolsBackArrows: 'faded',\n\n\t// Display a presentation progress bar\n\tprogress: true,\n\n\t// Display the page number of the current slide\n\t// - true:    Show slide number\n\t// - false:   Hide slide number\n\t//\n\t// Can optionally be set as a string that specifies the number formatting:\n\t// - \"h.v\":\t  Horizontal . vertical slide number (default)\n\t// - \"h/v\":\t  Horizontal / vertical slide number\n\t// - \"c\":\t  Flattened slide number\n\t// - \"c/t\":\t  Flattened slide number / total slides\n\t//\n\t// Alternatively, you can provide a function that returns the slide\n\t// number for the current slide. The function should take in a slide\n\t// object and return an array with one string [slideNumber] or\n\t// three strings [n1,delimiter,n2]. See #formatSlideNumber().\n\tslideNumber: false,\n\n\t// Can be used to limit the contexts in which the slide number appears\n\t// - \"all\":      Always show the slide number\n\t// - \"print\":    Only when printing to PDF\n\t// - \"speaker\":  Only in the speaker view\n\tshowSlideNumber: 'all',\n\n\t// Use 1 based indexing for # links to match slide number (default is zero\n\t// based)\n\thashOneBasedIndex: false,\n\n\t// Add the current slide number to the URL hash so that reloading the\n\t// page/copying the URL will return you to the same slide\n\thash: false,\n\n\t// Flags if we should monitor the hash and change slides accordingly\n\trespondToHashChanges: true,\n\n\t// Push each slide change to the browser history.  Implies `hash: true`\n\thistory: false,\n\n\t// Enable keyboard shortcuts for navigation\n\tkeyboard: true,\n\n\t// Optional function that blocks keyboard events when retuning false\n\t//\n\t// If you set this to 'focused', we will only capture keyboard events\n\t// for embedded decks when they are in focus\n\tkeyboardCondition: null,\n\n\t// Disables the default reveal.js slide layout (scaling and centering)\n\t// so that you can use custom CSS layout\n\tdisableLayout: false,\n\n\t// Enable the slide overview mode\n\toverview: true,\n\n\t// Vertical centering of slides\n\tcenter: true,\n\n\t// Enables touch navigation on devices with touch input\n\ttouch: true,\n\n\t// Loop the presentation\n\tloop: false,\n\n\t// Change the presentation direction to be RTL\n\trtl: false,\n\n\t// Changes the behavior of our navigation directions.\n\t//\n\t// \"default\"\n\t// Left/right arrow keys step between horizontal slides, up/down\n\t// arrow keys step between vertical slides. Space key steps through\n\t// all slides (both horizontal and vertical).\n\t//\n\t// \"linear\"\n\t// Removes the up/down arrows. Left/right arrows step through all\n\t// slides (both horizontal and vertical).\n\t//\n\t// \"grid\"\n\t// When this is enabled, stepping left/right from a vertical stack\n\t// to an adjacent vertical stack will land you at the same vertical\n\t// index.\n\t//\n\t// Consider a deck with six slides ordered in two vertical stacks:\n\t// 1.1    2.1\n\t// 1.2    2.2\n\t// 1.3    2.3\n\t//\n\t// If you're on slide 1.3 and navigate right, you will normally move\n\t// from 1.3 -> 2.1. If \"grid\" is used, the same navigation takes you\n\t// from 1.3 -> 2.3.\n\tnavigationMode: 'default',\n\n\t// Randomizes the order of slides each time the presentation loads\n\tshuffle: false,\n\n\t// Turns fragments on and off globally\n\tfragments: true,\n\n\t// Flags whether to include the current fragment in the URL,\n\t// so that reloading brings you to the same fragment position\n\tfragmentInURL: true,\n\n\t// Flags if the presentation is running in an embedded mode,\n\t// i.e. contained within a limited portion of the screen\n\tembedded: false,\n\n\t// Flags if we should show a help overlay when the question-mark\n\t// key is pressed\n\thelp: true,\n\n\t// Flags if it should be possible to pause the presentation (blackout)\n\tpause: true,\n\n\t// Flags if speaker notes should be visible to all viewers\n\tshowNotes: false,\n\n\t// Flags if slides with data-visibility=\"hidden\" should be kep visible\n\tshowHiddenSlides: false,\n\n\t// Global override for autoplaying embedded media (video/audio/iframe)\n\t// - null:   Media will only autoplay if data-autoplay is present\n\t// - true:   All media will autoplay, regardless of individual setting\n\t// - false:  No media will autoplay, regardless of individual setting\n\tautoPlayMedia: null,\n\n\t// Global override for preloading lazy-loaded iframes\n\t// - null:   Iframes with data-src AND data-preload will be loaded when within\n\t//           the viewDistance, iframes with only data-src will be loaded when visible\n\t// - true:   All iframes with data-src will be loaded when within the viewDistance\n\t// - false:  All iframes with data-src will be loaded only when visible\n\tpreloadIframes: null,\n\n\t// Can be used to globally disable auto-animation\n\tautoAnimate: true,\n\n\t// Optionally provide a custom element matcher that will be\n\t// used to dictate which elements we can animate between.\n\tautoAnimateMatcher: null,\n\n\t// Default settings for our auto-animate transitions, can be\n\t// overridden per-slide or per-element via data arguments\n\tautoAnimateEasing: 'ease',\n\tautoAnimateDuration: 1.0,\n\tautoAnimateUnmatched: true,\n\n\t// CSS properties that can be auto-animated. Position & scale\n\t// is matched separately so there's no need to include styles\n\t// like top/right/bottom/left, width/height or margin.\n\tautoAnimateStyles: [\n\t\t'opacity',\n\t\t'color',\n\t\t'background-color',\n\t\t'padding',\n\t\t'font-size',\n\t\t'line-height',\n\t\t'letter-spacing',\n\t\t'border-width',\n\t\t'border-color',\n\t\t'border-radius',\n\t\t'outline',\n\t\t'outline-offset'\n\t],\n\n\t// Controls automatic progression to the next slide\n\t// - 0:      Auto-sliding only happens if the data-autoslide HTML attribute\n\t//           is present on the current slide or fragment\n\t// - 1+:     All slides will progress automatically at the given interval\n\t// - false:  No auto-sliding, even if data-autoslide is present\n\tautoSlide: 0,\n\n\t// Stop auto-sliding after user input\n\tautoSlideStoppable: true,\n\n\t// Use this method for navigation when auto-sliding (defaults to navigateNext)\n\tautoSlideMethod: null,\n\n\t// Specify the average time in seconds that you think you will spend\n\t// presenting each slide. This is used to show a pacing timer in the\n\t// speaker view\n\tdefaultTiming: null,\n\n\t// Enable slide navigation via mouse wheel\n\tmouseWheel: false,\n\n\t// Opens links in an iframe preview overlay\n\t// Add `data-preview-link` and `data-preview-link=\"false\"` to customise each link\n\t// individually\n\tpreviewLinks: false,\n\n\t// Exposes the reveal.js API through window.postMessage\n\tpostMessage: true,\n\n\t// Dispatches all reveal.js events to the parent window through postMessage\n\tpostMessageEvents: false,\n\n\t// Focuses body when page changes visibility to ensure keyboard shortcuts work\n\tfocusBodyOnPageVisibilityChange: true,\n\n\t// Transition style\n\ttransition: 'slide', // none/fade/slide/convex/concave/zoom\n\n\t// Transition speed\n\ttransitionSpeed: 'default', // default/fast/slow\n\n\t// Transition style for full page slide backgrounds\n\tbackgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom\n\n\t// Parallax background image\n\tparallaxBackgroundImage: '', // CSS syntax, e.g. \"a.jpg\"\n\n\t// Parallax background size\n\tparallaxBackgroundSize: '', // CSS syntax, e.g. \"3000px 2000px\"\n\n\t// Parallax background repeat\n\tparallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit\n\n\t// Parallax background position\n\tparallaxBackgroundPosition: '', // CSS syntax, e.g. \"top left\"\n\n\t// Amount of pixels to move the parallax background per slide step\n\tparallaxBackgroundHorizontal: null,\n\tparallaxBackgroundVertical: null,\n\n\t// The maximum number of pages a single slide can expand onto when printing\n\t// to PDF, unlimited by default\n\tpdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,\n\n\t// Prints each fragment on a separate slide\n\tpdfSeparateFragments: true,\n\n\t// Offset used to reduce the height of content within exported PDF pages.\n\t// This exists to account for environment differences based on how you\n\t// print to PDF. CLI printing options, like phantomjs and wkpdf, can end\n\t// on precisely the total height of the document whereas in-browser\n\t// printing has to end one pixel before.\n\tpdfPageHeightOffset: -1,\n\n\t// Number of slides away from the current that are visible\n\tviewDistance: 3,\n\n\t// Number of slides away from the current that are visible on mobile\n\t// devices. It is advisable to set this to a lower number than\n\t// viewDistance in order to save resources.\n\tmobileViewDistance: 2,\n\n\t// The display mode that will be used to show slides\n\tdisplay: 'block',\n\n\t// Hide cursor if inactive\n\thideInactiveCursor: true,\n\n\t// Time before the cursor is hidden (in ms)\n\thideCursorTime: 5000,\n\n\t// Script dependencies to load\n\tdependencies: [],\n\n\t// Plugin objects to register and use for this presentation\n\tplugins: []\n\n}","import SlideContent from './controllers/slidecontent.js'\nimport SlideNumber from './controllers/slidenumber.js'\nimport Backgrounds from './controllers/backgrounds.js'\nimport AutoAnimate from './controllers/autoanimate.js'\nimport Fragments from './controllers/fragments.js'\nimport Overview from './controllers/overview.js'\nimport Keyboard from './controllers/keyboard.js'\nimport Location from './controllers/location.js'\nimport Controls from './controllers/controls.js'\nimport Progress from './controllers/progress.js'\nimport Pointer from './controllers/pointer.js'\nimport Plugins from './controllers/plugins.js'\nimport Print from './controllers/print.js'\nimport Touch from './controllers/touch.js'\nimport Focus from './controllers/focus.js'\nimport Notes from './controllers/notes.js'\nimport Playback from './components/playback.js'\nimport defaultConfig from './config.js'\nimport * as Util from './utils/util.js'\nimport * as Device from './utils/device.js'\nimport {\n\tSLIDES_SELECTOR,\n\tHORIZONTAL_SLIDES_SELECTOR,\n\tVERTICAL_SLIDES_SELECTOR,\n\tPOST_MESSAGE_METHOD_BLACKLIST\n} from './utils/constants.js'\n\n// The reveal.js version\nexport const VERSION = '4.3.1';\n\n/**\n * reveal.js\n * https://revealjs.com\n * MIT licensed\n *\n * Copyright (C) 2011-2022 Hakim El Hattab, https://hakim.se\n */\nexport default function( revealElement, options ) {\n\n\t// Support initialization with no args, one arg\n\t// [options] or two args [revealElement, options]\n\tif( arguments.length < 2 ) {\n\t\toptions = arguments[0];\n\t\trevealElement = document.querySelector( '.reveal' );\n\t}\n\n\tconst Reveal = {};\n\n\t// Configuration defaults, can be overridden at initialization time\n\tlet config = {},\n\n\t\t// Flags if reveal.js is loaded (has dispatched the 'ready' event)\n\t\tready = false,\n\n\t\t// The horizontal and vertical index of the currently active slide\n\t\tindexh,\n\t\tindexv,\n\n\t\t// The previous and current slide HTML elements\n\t\tpreviousSlide,\n\t\tcurrentSlide,\n\n\t\t// Remember which directions that the user has navigated towards\n\t\tnavigationHistory = {\n\t\t\thasNavigatedHorizontally: false,\n\t\t\thasNavigatedVertically: false\n\t\t},\n\n\t\t// Slides may have a data-state attribute which we pick up and apply\n\t\t// as a class to the body. This list contains the combined state of\n\t\t// all current slides.\n\t\tstate = [],\n\n\t\t// The current scale of the presentation (see width/height config)\n\t\tscale = 1,\n\n\t\t// CSS transform that is currently applied to the slides container,\n\t\t// split into two groups\n\t\tslidesTransform = { layout: '', overview: '' },\n\n\t\t// Cached references to DOM elements\n\t\tdom = {},\n\n\t\t// Flags if the interaction event listeners are bound\n\t\teventsAreBound = false,\n\n\t\t// The current slide transition state; idle or running\n\t\ttransition = 'idle',\n\n\t\t// The current auto-slide duration\n\t\tautoSlide = 0,\n\n\t\t// Auto slide properties\n\t\tautoSlidePlayer,\n\t\tautoSlideTimeout = 0,\n\t\tautoSlideStartTime = -1,\n\t\tautoSlidePaused = false,\n\n\t\t// Controllers for different aspects of our presentation. They're\n\t\t// all given direct references to this Reveal instance since there\n\t\t// may be multiple presentations running in parallel.\n\t\tslideContent = new SlideContent( Reveal ),\n\t\tslideNumber = new SlideNumber( Reveal ),\n\t\tautoAnimate = new AutoAnimate( Reveal ),\n\t\tbackgrounds = new Backgrounds( Reveal ),\n\t\tfragments = new Fragments( Reveal ),\n\t\toverview = new Overview( Reveal ),\n\t\tkeyboard = new Keyboard( Reveal ),\n\t\tlocation = new Location( Reveal ),\n\t\tcontrols = new Controls( Reveal ),\n\t\tprogress = new Progress( Reveal ),\n\t\tpointer = new Pointer( Reveal ),\n\t\tplugins = new Plugins( Reveal ),\n\t\tprint = new Print( Reveal ),\n\t\tfocus = new Focus( Reveal ),\n\t\ttouch = new Touch( Reveal ),\n\t\tnotes = new Notes( Reveal );\n\n\t/**\n\t * Starts up the presentation.\n\t */\n\tfunction initialize( initOptions ) {\n\n\t\tif( !revealElement ) throw 'Unable to find presentation root (<div class=\"reveal\">).';\n\n\t\t// Cache references to key DOM elements\n\t\tdom.wrapper = revealElement;\n\t\tdom.slides = revealElement.querySelector( '.slides' );\n\n\t\tif( !dom.slides ) throw 'Unable to find slides container (<div class=\"slides\">).';\n\n\t\t// Compose our config object in order of increasing precedence:\n\t\t// 1. Default reveal.js options\n\t\t// 2. Options provided via Reveal.configure() prior to\n\t\t//    initialization\n\t\t// 3. Options passed to the Reveal constructor\n\t\t// 4. Options passed to Reveal.initialize\n\t\t// 5. Query params\n\t\tconfig = { ...defaultConfig, ...config, ...options, ...initOptions, ...Util.getQueryHash() };\n\n\t\tsetViewport();\n\n\t\t// Force a layout when the whole page, incl fonts, has loaded\n\t\twindow.addEventListener( 'load', layout, false );\n\n\t\t// Register plugins and load dependencies, then move on to #start()\n\t\tplugins.load( config.plugins, config.dependencies ).then( start );\n\n\t\treturn new Promise( resolve => Reveal.on( 'ready', resolve ) );\n\n\t}\n\n\t/**\n\t * Encase the presentation in a reveal.js viewport. The\n\t * extent of the viewport differs based on configuration.\n\t */\n\tfunction setViewport() {\n\n\t\t// Embedded decks use the reveal element as their viewport\n\t\tif( config.embedded === true ) {\n\t\t\tdom.viewport = Util.closest( revealElement, '.reveal-viewport' ) || revealElement;\n\t\t}\n\t\t// Full-page decks use the body as their viewport\n\t\telse {\n\t\t\tdom.viewport = document.body;\n\t\t\tdocument.documentElement.classList.add( 'reveal-full-page' );\n\t\t}\n\n\t\tdom.viewport.classList.add( 'reveal-viewport' );\n\n\t}\n\n\t/**\n\t * Starts up reveal.js by binding input events and navigating\n\t * to the current URL deeplink if there is one.\n\t */\n\tfunction start() {\n\n\t\tready = true;\n\n\t\t// Remove slides hidden with data-visibility\n\t\tremoveHiddenSlides();\n\n\t\t// Make sure we've got all the DOM elements we need\n\t\tsetupDOM();\n\n\t\t// Listen to messages posted to this window\n\t\tsetupPostMessage();\n\n\t\t// Prevent the slides from being scrolled out of view\n\t\tsetupScrollPrevention();\n\n\t\t// Adds bindings for fullscreen mode\n\t\tsetupFullscreen();\n\n\t\t// Resets all vertical slides so that only the first is visible\n\t\tresetVerticalSlides();\n\n\t\t// Updates the presentation to match the current configuration values\n\t\tconfigure();\n\n\t\t// Read the initial hash\n\t\tlocation.readURL();\n\n\t\t// Create slide backgrounds\n\t\tbackgrounds.update( true );\n\n\t\t// Notify listeners that the presentation is ready but use a 1ms\n\t\t// timeout to ensure it's not fired synchronously after #initialize()\n\t\tsetTimeout( () => {\n\t\t\t// Enable transitions now that we're loaded\n\t\t\tdom.slides.classList.remove( 'no-transition' );\n\n\t\t\tdom.wrapper.classList.add( 'ready' );\n\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'ready',\n\t\t\t\tdata: {\n\t\t\t\t\tindexh,\n\t\t\t\t\tindexv,\n\t\t\t\t\tcurrentSlide\n\t\t\t\t}\n\t\t\t});\n\t\t}, 1 );\n\n\t\t// Special setup and config is required when printing to PDF\n\t\tif( print.isPrintingPDF() ) {\n\t\t\tremoveEventListeners();\n\n\t\t\t// The document needs to have loaded for the PDF layout\n\t\t\t// measurements to be accurate\n\t\t\tif( document.readyState === 'complete' ) {\n\t\t\t\tprint.setupPDF();\n\t\t\t}\n\t\t\telse {\n\t\t\t\twindow.addEventListener( 'load', () => {\n\t\t\t\t\tprint.setupPDF();\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Removes all slides with data-visibility=\"hidden\". This\n\t * is done right before the rest of the presentation is\n\t * initialized.\n\t *\n\t * If you want to show all hidden slides, initialize\n\t * reveal.js with showHiddenSlides set to true.\n\t */\n\tfunction removeHiddenSlides() {\n\n\t\tif( !config.showHiddenSlides ) {\n\t\t\tUtil.queryAll( dom.wrapper, 'section[data-visibility=\"hidden\"]' ).forEach( slide => {\n\t\t\t\tslide.parentNode.removeChild( slide );\n\t\t\t} );\n\t\t}\n\n\t}\n\n\t/**\n\t * Finds and stores references to DOM elements which are\n\t * required by the presentation. If a required element is\n\t * not found, it is created.\n\t */\n\tfunction setupDOM() {\n\n\t\t// Prevent transitions while we're loading\n\t\tdom.slides.classList.add( 'no-transition' );\n\n\t\tif( Device.isMobile ) {\n\t\t\tdom.wrapper.classList.add( 'no-hover' );\n\t\t}\n\t\telse {\n\t\t\tdom.wrapper.classList.remove( 'no-hover' );\n\t\t}\n\n\t\tbackgrounds.render();\n\t\tslideNumber.render();\n\t\tcontrols.render();\n\t\tprogress.render();\n\t\tnotes.render();\n\n\t\t// Overlay graphic which is displayed during the paused mode\n\t\tdom.pauseOverlay = Util.createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class=\"resume-button\">Resume presentation</button>' : null );\n\n\t\tdom.statusElement = createStatusElement();\n\n\t\tdom.wrapper.setAttribute( 'role', 'application' );\n\t}\n\n\t/**\n\t * Creates a hidden div with role aria-live to announce the\n\t * current slide content. Hide the div off-screen to make it\n\t * available only to Assistive Technologies.\n\t *\n\t * @return {HTMLElement}\n\t */\n\tfunction createStatusElement() {\n\n\t\tlet statusElement = dom.wrapper.querySelector( '.aria-status' );\n\t\tif( !statusElement ) {\n\t\t\tstatusElement = document.createElement( 'div' );\n\t\t\tstatusElement.style.position = 'absolute';\n\t\t\tstatusElement.style.height = '1px';\n\t\t\tstatusElement.style.width = '1px';\n\t\t\tstatusElement.style.overflow = 'hidden';\n\t\t\tstatusElement.style.clip = 'rect( 1px, 1px, 1px, 1px )';\n\t\t\tstatusElement.classList.add( 'aria-status' );\n\t\t\tstatusElement.setAttribute( 'aria-live', 'polite' );\n\t\t\tstatusElement.setAttribute( 'aria-atomic','true' );\n\t\t\tdom.wrapper.appendChild( statusElement );\n\t\t}\n\t\treturn statusElement;\n\n\t}\n\n\t/**\n\t * Announces the given text to screen readers.\n\t */\n\tfunction announceStatus( value ) {\n\n\t\tdom.statusElement.textContent = value;\n\n\t}\n\n\t/**\n\t * Converts the given HTML element into a string of text\n\t * that can be announced to a screen reader. Hidden\n\t * elements are excluded.\n\t */\n\tfunction getStatusText( node ) {\n\n\t\tlet text = '';\n\n\t\t// Text node\n\t\tif( node.nodeType === 3 ) {\n\t\t\ttext += node.textContent;\n\t\t}\n\t\t// Element node\n\t\telse if( node.nodeType === 1 ) {\n\n\t\t\tlet isAriaHidden = node.getAttribute( 'aria-hidden' );\n\t\t\tlet isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';\n\t\t\tif( isAriaHidden !== 'true' && !isDisplayHidden ) {\n\n\t\t\t\tArray.from( node.childNodes ).forEach( child => {\n\t\t\t\t\ttext += getStatusText( child );\n\t\t\t\t} );\n\n\t\t\t}\n\n\t\t}\n\n\t\ttext = text.trim();\n\n\t\treturn text === '' ? '' : text + ' ';\n\n\t}\n\n\t/**\n\t * This is an unfortunate necessity. Some actions – such as\n\t * an input field being focused in an iframe or using the\n\t * keyboard to expand text selection beyond the bounds of\n\t * a slide – can trigger our content to be pushed out of view.\n\t * This scrolling can not be prevented by hiding overflow in\n\t * CSS (we already do) so we have to resort to repeatedly\n\t * checking if the slides have been offset :(\n\t */\n\tfunction setupScrollPrevention() {\n\n\t\tsetInterval( () => {\n\t\t\tif( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {\n\t\t\t\tdom.wrapper.scrollTop = 0;\n\t\t\t\tdom.wrapper.scrollLeft = 0;\n\t\t\t}\n\t\t}, 1000 );\n\n\t}\n\n\t/**\n\t * After entering fullscreen we need to force a layout to\n\t * get our presentations to scale correctly. This behavior\n\t * is inconsistent across browsers but a force layout seems\n\t * to normalize it.\n\t */\n\tfunction setupFullscreen() {\n\n\t\tdocument.addEventListener( 'fullscreenchange', onFullscreenChange );\n\t\tdocument.addEventListener( 'webkitfullscreenchange', onFullscreenChange );\n\n\t}\n\n\t/**\n\t * Registers a listener to postMessage events, this makes it\n\t * possible to call all reveal.js API methods from another\n\t * window. For example:\n\t *\n\t * revealWindow.postMessage( JSON.stringify({\n\t *   method: 'slide',\n\t *   args: [ 2 ]\n\t * }), '*' );\n\t */\n\tfunction setupPostMessage() {\n\n\t\tif( config.postMessage ) {\n\t\t\twindow.addEventListener( 'message', onPostMessage, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Applies the configuration settings from the config\n\t * object. May be called multiple times.\n\t *\n\t * @param {object} options\n\t */\n\tfunction configure( options ) {\n\n\t\tconst oldConfig = { ...config }\n\n\t\t// New config options may be passed when this method\n\t\t// is invoked through the API after initialization\n\t\tif( typeof options === 'object' ) Util.extend( config, options );\n\n\t\t// Abort if reveal.js hasn't finished loading, config\n\t\t// changes will be applied automatically once ready\n\t\tif( Reveal.isReady() ===  false ) return;\n\n\t\tconst numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;\n\n\t\t// The transition is added as a class on the .reveal element\n\t\tdom.wrapper.classList.remove( oldConfig.transition );\n\t\tdom.wrapper.classList.add( config.transition );\n\n\t\tdom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );\n\t\tdom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );\n\n\t\t// Expose our configured slide dimensions as custom props\n\t\tdom.viewport.style.setProperty( '--slide-width', config.width + 'px' );\n\t\tdom.viewport.style.setProperty( '--slide-height', config.height + 'px' );\n\n\t\tif( config.shuffle ) {\n\t\t\tshuffle();\n\t\t}\n\n\t\tUtil.toggleClass( dom.wrapper, 'embedded', config.embedded );\n\t\tUtil.toggleClass( dom.wrapper, 'rtl', config.rtl );\n\t\tUtil.toggleClass( dom.wrapper, 'center', config.center );\n\n\t\t// Exit the paused mode if it was configured off\n\t\tif( config.pause === false ) {\n\t\t\tresume();\n\t\t}\n\n\t\t// Iframe link previews\n\t\tif( config.previewLinks ) {\n\t\t\tenablePreviewLinks();\n\t\t\tdisablePreviewLinks( '[data-preview-link=false]' );\n\t\t}\n\t\telse {\n\t\t\tdisablePreviewLinks();\n\t\t\tenablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );\n\t\t}\n\n\t\t// Reset all changes made by auto-animations\n\t\tautoAnimate.reset();\n\n\t\t// Remove existing auto-slide controls\n\t\tif( autoSlidePlayer ) {\n\t\t\tautoSlidePlayer.destroy();\n\t\t\tautoSlidePlayer = null;\n\t\t}\n\n\t\t// Generate auto-slide controls if needed\n\t\tif( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable ) {\n\t\t\tautoSlidePlayer = new Playback( dom.wrapper, () => {\n\t\t\t\treturn Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );\n\t\t\t} );\n\n\t\t\tautoSlidePlayer.on( 'click', onAutoSlidePlayerClick );\n\t\t\tautoSlidePaused = false;\n\t\t}\n\n\t\t// Add the navigation mode to the DOM so we can adjust styling\n\t\tif( config.navigationMode !== 'default' ) {\n\t\t\tdom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );\n\t\t}\n\t\telse {\n\t\t\tdom.wrapper.removeAttribute( 'data-navigation-mode' );\n\t\t}\n\n\t\tnotes.configure( config, oldConfig );\n\t\tfocus.configure( config, oldConfig );\n\t\tpointer.configure( config, oldConfig );\n\t\tcontrols.configure( config, oldConfig );\n\t\tprogress.configure( config, oldConfig );\n\t\tkeyboard.configure( config, oldConfig );\n\t\tfragments.configure( config, oldConfig );\n\t\tslideNumber.configure( config, oldConfig );\n\n\t\tsync();\n\n\t}\n\n\t/**\n\t * Binds all event listeners.\n\t */\n\tfunction addEventListeners() {\n\n\t\teventsAreBound = true;\n\n\t\twindow.addEventListener( 'resize', onWindowResize, false );\n\n\t\tif( config.touch ) touch.bind();\n\t\tif( config.keyboard ) keyboard.bind();\n\t\tif( config.progress ) progress.bind();\n\t\tif( config.respondToHashChanges ) location.bind();\n\t\tcontrols.bind();\n\t\tfocus.bind();\n\n\t\tdom.slides.addEventListener( 'click', onSlidesClicked, false );\n\t\tdom.slides.addEventListener( 'transitionend', onTransitionEnd, false );\n\t\tdom.pauseOverlay.addEventListener( 'click', resume, false );\n\n\t\tif( config.focusBodyOnPageVisibilityChange ) {\n\t\t\tdocument.addEventListener( 'visibilitychange', onPageVisibilityChange, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Unbinds all event listeners.\n\t */\n\tfunction removeEventListeners() {\n\n\t\teventsAreBound = false;\n\n\t\ttouch.unbind();\n\t\tfocus.unbind();\n\t\tkeyboard.unbind();\n\t\tcontrols.unbind();\n\t\tprogress.unbind();\n\t\tlocation.unbind();\n\n\t\twindow.removeEventListener( 'resize', onWindowResize, false );\n\n\t\tdom.slides.removeEventListener( 'click', onSlidesClicked, false );\n\t\tdom.slides.removeEventListener( 'transitionend', onTransitionEnd, false );\n\t\tdom.pauseOverlay.removeEventListener( 'click', resume, false );\n\n\t}\n\n\t/**\n\t * Uninitializes reveal.js by undoing changes made to the\n\t * DOM and removing all event listeners.\n\t */\n\tfunction destroy() {\n\n\t\tremoveEventListeners();\n\t\tcancelAutoSlide();\n\t\tdisablePreviewLinks();\n\n\t\t// Destroy controllers\n\t\tnotes.destroy();\n\t\tfocus.destroy();\n\t\tplugins.destroy();\n\t\tpointer.destroy();\n\t\tcontrols.destroy();\n\t\tprogress.destroy();\n\t\tbackgrounds.destroy();\n\t\tslideNumber.destroy();\n\n\t\t// Remove event listeners\n\t\tdocument.removeEventListener( 'fullscreenchange', onFullscreenChange );\n\t\tdocument.removeEventListener( 'webkitfullscreenchange', onFullscreenChange );\n\t\tdocument.removeEventListener( 'visibilitychange', onPageVisibilityChange, false );\n\t\twindow.removeEventListener( 'message', onPostMessage, false );\n\t\twindow.removeEventListener( 'load', layout, false );\n\n\t\t// Undo DOM changes\n\t\tif( dom.pauseOverlay ) dom.pauseOverlay.remove();\n\t\tif( dom.statusElement ) dom.statusElement.remove();\n\n\t\tdocument.documentElement.classList.remove( 'reveal-full-page' );\n\n\t\tdom.wrapper.classList.remove( 'ready', 'center', 'has-horizontal-slides', 'has-vertical-slides' );\n\t\tdom.wrapper.removeAttribute( 'data-transition-speed' );\n\t\tdom.wrapper.removeAttribute( 'data-background-transition' );\n\n\t\tdom.viewport.classList.remove( 'reveal-viewport' );\n\t\tdom.viewport.style.removeProperty( '--slide-width' );\n\t\tdom.viewport.style.removeProperty( '--slide-height' );\n\n\t\tdom.slides.style.removeProperty( 'width' );\n\t\tdom.slides.style.removeProperty( 'height' );\n\t\tdom.slides.style.removeProperty( 'zoom' );\n\t\tdom.slides.style.removeProperty( 'left' );\n\t\tdom.slides.style.removeProperty( 'top' );\n\t\tdom.slides.style.removeProperty( 'bottom' );\n\t\tdom.slides.style.removeProperty( 'right' );\n\t\tdom.slides.style.removeProperty( 'transform' );\n\n\t\tArray.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( slide => {\n\t\t\tslide.style.removeProperty( 'display' );\n\t\t\tslide.style.removeProperty( 'top' );\n\t\t\tslide.removeAttribute( 'hidden' );\n\t\t\tslide.removeAttribute( 'aria-hidden' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Adds a listener to one of our custom reveal.js events,\n\t * like slidechanged.\n\t */\n\tfunction on( type, listener, useCapture ) {\n\n\t\trevealElement.addEventListener( type, listener, useCapture );\n\n\t}\n\n\t/**\n\t * Unsubscribes from a reveal.js event.\n\t */\n\tfunction off( type, listener, useCapture ) {\n\n\t\trevealElement.removeEventListener( type, listener, useCapture );\n\n\t}\n\n\t/**\n\t * Applies CSS transforms to the slides container. The container\n\t * is transformed from two separate sources: layout and the overview\n\t * mode.\n\t *\n\t * @param {object} transforms\n\t */\n\tfunction transformSlides( transforms ) {\n\n\t\t// Pick up new transforms from arguments\n\t\tif( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;\n\t\tif( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;\n\n\t\t// Apply the transforms to the slides container\n\t\tif( slidesTransform.layout ) {\n\t\t\tUtil.transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );\n\t\t}\n\t\telse {\n\t\t\tUtil.transformElement( dom.slides, slidesTransform.overview );\n\t\t}\n\n\t}\n\n\t/**\n\t * Dispatches an event of the specified type from the\n\t * reveal DOM element.\n\t */\n\tfunction dispatchEvent({ target=dom.wrapper, type, data, bubbles=true }) {\n\n\t\tlet event = document.createEvent( 'HTMLEvents', 1, 2 );\n\t\tevent.initEvent( type, bubbles, true );\n\t\tUtil.extend( event, data );\n\t\ttarget.dispatchEvent( event );\n\n\t\tif( target === dom.wrapper ) {\n\t\t\t// If we're in an iframe, post each reveal.js event to the\n\t\t\t// parent window. Used by the notes plugin\n\t\t\tdispatchPostMessage( type );\n\t\t}\n\n\t\treturn event;\n\n\t}\n\n\t/**\n\t * Dispatched a postMessage of the given type from our window.\n\t */\n\tfunction dispatchPostMessage( type, data ) {\n\n\t\tif( config.postMessageEvents && window.parent !== window.self ) {\n\t\t\tlet message = {\n\t\t\t\tnamespace: 'reveal',\n\t\t\t\teventName: type,\n\t\t\t\tstate: getState()\n\t\t\t};\n\n\t\t\tUtil.extend( message, data );\n\n\t\t\twindow.parent.postMessage( JSON.stringify( message ), '*' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Bind preview frame links.\n\t *\n\t * @param {string} [selector=a] - selector for anchors\n\t */\n\tfunction enablePreviewLinks( selector = 'a' ) {\n\n\t\tArray.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {\n\t\t\tif( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {\n\t\t\t\telement.addEventListener( 'click', onPreviewLinkClicked, false );\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Unbind preview frame links.\n\t */\n\tfunction disablePreviewLinks( selector = 'a' ) {\n\n\t\tArray.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {\n\t\t\tif( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {\n\t\t\t\telement.removeEventListener( 'click', onPreviewLinkClicked, false );\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Opens a preview window for the target URL.\n\t *\n\t * @param {string} url - url for preview iframe src\n\t */\n\tfunction showPreview( url ) {\n\n\t\tcloseOverlay();\n\n\t\tdom.overlay = document.createElement( 'div' );\n\t\tdom.overlay.classList.add( 'overlay' );\n\t\tdom.overlay.classList.add( 'overlay-preview' );\n\t\tdom.wrapper.appendChild( dom.overlay );\n\n\t\tdom.overlay.innerHTML =\n\t\t\t`<header>\n\t\t\t\t<a class=\"close\" href=\"#\"><span class=\"icon\"></span></a>\n\t\t\t\t<a class=\"external\" href=\"${url}\" target=\"_blank\"><span class=\"icon\"></span></a>\n\t\t\t</header>\n\t\t\t<div class=\"spinner\"></div>\n\t\t\t<div class=\"viewport\">\n\t\t\t\t<iframe src=\"${url}\"></iframe>\n\t\t\t\t<small class=\"viewport-inner\">\n\t\t\t\t\t<span class=\"x-frame-error\">Unable to load iframe. This is likely due to the site's policy (x-frame-options).</span>\n\t\t\t\t</small>\n\t\t\t</div>`;\n\n\t\tdom.overlay.querySelector( 'iframe' ).addEventListener( 'load', event => {\n\t\t\tdom.overlay.classList.add( 'loaded' );\n\t\t}, false );\n\n\t\tdom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {\n\t\t\tcloseOverlay();\n\t\t\tevent.preventDefault();\n\t\t}, false );\n\n\t\tdom.overlay.querySelector( '.external' ).addEventListener( 'click', event => {\n\t\t\tcloseOverlay();\n\t\t}, false );\n\n\t}\n\n\t/**\n\t * Open or close help overlay window.\n\t *\n\t * @param {Boolean} [override] Flag which overrides the\n\t * toggle logic and forcibly sets the desired state. True means\n\t * help is open, false means it's closed.\n\t */\n\tfunction toggleHelp( override ){\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? showHelp() : closeOverlay();\n\t\t}\n\t\telse {\n\t\t\tif( dom.overlay ) {\n\t\t\t\tcloseOverlay();\n\t\t\t}\n\t\t\telse {\n\t\t\t\tshowHelp();\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Opens an overlay window with help material.\n\t */\n\tfunction showHelp() {\n\n\t\tif( config.help ) {\n\n\t\t\tcloseOverlay();\n\n\t\t\tdom.overlay = document.createElement( 'div' );\n\t\t\tdom.overlay.classList.add( 'overlay' );\n\t\t\tdom.overlay.classList.add( 'overlay-help' );\n\t\t\tdom.wrapper.appendChild( dom.overlay );\n\n\t\t\tlet html = '<p class=\"title\">Keyboard Shortcuts</p><br/>';\n\n\t\t\tlet shortcuts = keyboard.getShortcuts(),\n\t\t\t\tbindings = keyboard.getBindings();\n\n\t\t\thtml += '<table><th>KEY</th><th>ACTION</th>';\n\t\t\tfor( let key in shortcuts ) {\n\t\t\t\thtml += `<tr><td>${key}</td><td>${shortcuts[ key ]}</td></tr>`;\n\t\t\t}\n\n\t\t\t// Add custom key bindings that have associated descriptions\n\t\t\tfor( let binding in bindings ) {\n\t\t\t\tif( bindings[binding].key && bindings[binding].description ) {\n\t\t\t\t\thtml += `<tr><td>${bindings[binding].key}</td><td>${bindings[binding].description}</td></tr>`;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\thtml += '</table>';\n\n\t\t\tdom.overlay.innerHTML = `\n\t\t\t\t<header>\n\t\t\t\t\t<a class=\"close\" href=\"#\"><span class=\"icon\"></span></a>\n\t\t\t\t</header>\n\t\t\t\t<div class=\"viewport\">\n\t\t\t\t\t<div class=\"viewport-inner\">${html}</div>\n\t\t\t\t</div>\n\t\t\t`;\n\n\t\t\tdom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {\n\t\t\t\tcloseOverlay();\n\t\t\t\tevent.preventDefault();\n\t\t\t}, false );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Closes any currently open overlay.\n\t */\n\tfunction closeOverlay() {\n\n\t\tif( dom.overlay ) {\n\t\t\tdom.overlay.parentNode.removeChild( dom.overlay );\n\t\t\tdom.overlay = null;\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Applies JavaScript-controlled layout rules to the\n\t * presentation.\n\t */\n\tfunction layout() {\n\n\t\tif( dom.wrapper && !print.isPrintingPDF() ) {\n\n\t\t\tif( !config.disableLayout ) {\n\n\t\t\t\t// On some mobile devices '100vh' is taller than the visible\n\t\t\t\t// viewport which leads to part of the presentation being\n\t\t\t\t// cut off. To work around this we define our own '--vh' custom\n\t\t\t\t// property where 100x adds up to the correct height.\n\t\t\t\t//\n\t\t\t\t// https://css-tricks.com/the-trick-to-viewport-units-on-mobile/\n\t\t\t\tif( Device.isMobile && !config.embedded ) {\n\t\t\t\t\tdocument.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );\n\t\t\t\t}\n\n\t\t\t\tconst size = getComputedSlideSize();\n\n\t\t\t\tconst oldScale = scale;\n\n\t\t\t\t// Layout the contents of the slides\n\t\t\t\tlayoutSlideContents( config.width, config.height );\n\n\t\t\t\tdom.slides.style.width = size.width + 'px';\n\t\t\t\tdom.slides.style.height = size.height + 'px';\n\n\t\t\t\t// Determine scale of content to fit within available space\n\t\t\t\tscale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );\n\n\t\t\t\t// Respect max/min scale settings\n\t\t\t\tscale = Math.max( scale, config.minScale );\n\t\t\t\tscale = Math.min( scale, config.maxScale );\n\n\t\t\t\t// Don't apply any scaling styles if scale is 1\n\t\t\t\tif( scale === 1 ) {\n\t\t\t\t\tdom.slides.style.zoom = '';\n\t\t\t\t\tdom.slides.style.left = '';\n\t\t\t\t\tdom.slides.style.top = '';\n\t\t\t\t\tdom.slides.style.bottom = '';\n\t\t\t\t\tdom.slides.style.right = '';\n\t\t\t\t\ttransformSlides( { layout: '' } );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tdom.slides.style.zoom = '';\n\t\t\t\t\tdom.slides.style.left = '50%';\n\t\t\t\t\tdom.slides.style.top = '50%';\n\t\t\t\t\tdom.slides.style.bottom = 'auto';\n\t\t\t\t\tdom.slides.style.right = 'auto';\n\t\t\t\t\ttransformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );\n\t\t\t\t}\n\n\t\t\t\t// Select all slides, vertical and horizontal\n\t\t\t\tconst slides = Array.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );\n\n\t\t\t\tfor( let i = 0, len = slides.length; i < len; i++ ) {\n\t\t\t\t\tconst slide = slides[ i ];\n\n\t\t\t\t\t// Don't bother updating invisible slides\n\t\t\t\t\tif( slide.style.display === 'none' ) {\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\tif( config.center || slide.classList.contains( 'center' ) ) {\n\t\t\t\t\t\t// Vertical stacks are not centred since their section\n\t\t\t\t\t\t// children will be\n\t\t\t\t\t\tif( slide.classList.contains( 'stack' ) ) {\n\t\t\t\t\t\t\tslide.style.top = 0;\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tslide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tslide.style.top = '';\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tif( oldScale !== scale ) {\n\t\t\t\t\tdispatchEvent({\n\t\t\t\t\t\ttype: 'resize',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\toldScale,\n\t\t\t\t\t\t\tscale,\n\t\t\t\t\t\t\tsize\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdom.viewport.style.setProperty( '--slide-scale', scale );\n\n\t\t\tprogress.update();\n\t\t\tbackgrounds.updateParallax();\n\n\t\t\tif( overview.isActive() ) {\n\t\t\t\toverview.update();\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Applies layout logic to the contents of all slides in\n\t * the presentation.\n\t *\n\t * @param {string|number} width\n\t * @param {string|number} height\n\t */\n\tfunction layoutSlideContents( width, height ) {\n\n\t\t// Handle sizing of elements with the 'r-stretch' class\n\t\tUtil.queryAll( dom.slides, 'section > .stretch, section > .r-stretch' ).forEach( element => {\n\n\t\t\t// Determine how much vertical space we can use\n\t\t\tlet remainingHeight = Util.getRemainingHeight( element, height );\n\n\t\t\t// Consider the aspect ratio of media elements\n\t\t\tif( /(img|video)/gi.test( element.nodeName ) ) {\n\t\t\t\tconst nw = element.naturalWidth || element.videoWidth,\n\t\t\t\t\t  nh = element.naturalHeight || element.videoHeight;\n\n\t\t\t\tconst es = Math.min( width / nw, remainingHeight / nh );\n\n\t\t\t\telement.style.width = ( nw * es ) + 'px';\n\t\t\t\telement.style.height = ( nh * es ) + 'px';\n\n\t\t\t}\n\t\t\telse {\n\t\t\t\telement.style.width = width + 'px';\n\t\t\t\telement.style.height = remainingHeight + 'px';\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Calculates the computed pixel size of our slides. These\n\t * values are based on the width and height configuration\n\t * options.\n\t *\n\t * @param {number} [presentationWidth=dom.wrapper.offsetWidth]\n\t * @param {number} [presentationHeight=dom.wrapper.offsetHeight]\n\t */\n\tfunction getComputedSlideSize( presentationWidth, presentationHeight ) {\n\n\t\tconst size = {\n\t\t\t// Slide size\n\t\t\twidth: config.width,\n\t\t\theight: config.height,\n\n\t\t\t// Presentation size\n\t\t\tpresentationWidth: presentationWidth || dom.wrapper.offsetWidth,\n\t\t\tpresentationHeight: presentationHeight || dom.wrapper.offsetHeight\n\t\t};\n\n\t\t// Reduce available space by margin\n\t\tsize.presentationWidth -= ( size.presentationWidth * config.margin );\n\t\tsize.presentationHeight -= ( size.presentationHeight * config.margin );\n\n\t\t// Slide width may be a percentage of available width\n\t\tif( typeof size.width === 'string' && /%$/.test( size.width ) ) {\n\t\t\tsize.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;\n\t\t}\n\n\t\t// Slide height may be a percentage of available height\n\t\tif( typeof size.height === 'string' && /%$/.test( size.height ) ) {\n\t\t\tsize.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;\n\t\t}\n\n\t\treturn size;\n\n\t}\n\n\t/**\n\t * Stores the vertical index of a stack so that the same\n\t * vertical slide can be selected when navigating to and\n\t * from the stack.\n\t *\n\t * @param {HTMLElement} stack The vertical stack element\n\t * @param {string|number} [v=0] Index to memorize\n\t */\n\tfunction setPreviousVerticalIndex( stack, v ) {\n\n\t\tif( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {\n\t\t\tstack.setAttribute( 'data-previous-indexv', v || 0 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Retrieves the vertical index which was stored using\n\t * #setPreviousVerticalIndex() or 0 if no previous index\n\t * exists.\n\t *\n\t * @param {HTMLElement} stack The vertical stack element\n\t */\n\tfunction getPreviousVerticalIndex( stack ) {\n\n\t\tif( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {\n\t\t\t// Prefer manually defined start-indexv\n\t\t\tconst attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';\n\n\t\t\treturn parseInt( stack.getAttribute( attributeName ) || 0, 10 );\n\t\t}\n\n\t\treturn 0;\n\n\t}\n\n\t/**\n\t * Checks if the current or specified slide is vertical\n\t * (nested within another slide).\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide to check\n\t * orientation of\n\t * @return {Boolean}\n\t */\n\tfunction isVerticalSlide( slide = currentSlide ) {\n\n\t\treturn slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );\n\n\t}\n\n\t/**\n\t * Returns true if we're on the last slide in the current\n\t * vertical stack.\n\t */\n\tfunction isLastVerticalSlide() {\n\n\t\tif( currentSlide && isVerticalSlide( currentSlide ) ) {\n\t\t\t// Does this slide have a next sibling?\n\t\t\tif( currentSlide.nextElementSibling ) return false;\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Returns true if we're currently on the first slide in\n\t * the presentation.\n\t */\n\tfunction isFirstSlide() {\n\n\t\treturn indexh === 0 && indexv === 0;\n\n\t}\n\n\t/**\n\t * Returns true if we're currently on the last slide in\n\t * the presenation. If the last slide is a stack, we only\n\t * consider this the last slide if it's at the end of the\n\t * stack.\n\t */\n\tfunction isLastSlide() {\n\n\t\tif( currentSlide ) {\n\t\t\t// Does this slide have a next sibling?\n\t\t\tif( currentSlide.nextElementSibling ) return false;\n\n\t\t\t// If it's vertical, does its parent have a next sibling?\n\t\t\tif( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Enters the paused mode which fades everything on screen to\n\t * black.\n\t */\n\tfunction pause() {\n\n\t\tif( config.pause ) {\n\t\t\tconst wasPaused = dom.wrapper.classList.contains( 'paused' );\n\n\t\t\tcancelAutoSlide();\n\t\t\tdom.wrapper.classList.add( 'paused' );\n\n\t\t\tif( wasPaused === false ) {\n\t\t\t\tdispatchEvent({ type: 'paused' });\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Exits from the paused mode.\n\t */\n\tfunction resume() {\n\n\t\tconst wasPaused = dom.wrapper.classList.contains( 'paused' );\n\t\tdom.wrapper.classList.remove( 'paused' );\n\n\t\tcueAutoSlide();\n\n\t\tif( wasPaused ) {\n\t\t\tdispatchEvent({ type: 'resumed' });\n\t\t}\n\n\t}\n\n\t/**\n\t * Toggles the paused mode on and off.\n\t */\n\tfunction togglePause( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? pause() : resume();\n\t\t}\n\t\telse {\n\t\t\tisPaused() ? resume() : pause();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if we are currently in the paused mode.\n\t *\n\t * @return {Boolean}\n\t */\n\tfunction isPaused() {\n\n\t\treturn dom.wrapper.classList.contains( 'paused' );\n\n\t}\n\n\t/**\n\t * Toggles the auto slide mode on and off.\n\t *\n\t * @param {Boolean} [override] Flag which sets the desired state.\n\t * True means autoplay starts, false means it stops.\n\t */\n\n\tfunction toggleAutoSlide( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? resumeAutoSlide() : pauseAutoSlide();\n\t\t}\n\n\t\telse {\n\t\t\tautoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if the auto slide mode is currently on.\n\t *\n\t * @return {Boolean}\n\t */\n\tfunction isAutoSliding() {\n\n\t\treturn !!( autoSlide && !autoSlidePaused );\n\n\t}\n\n\t/**\n\t * Steps from the current point in the presentation to the\n\t * slide which matches the specified horizontal and vertical\n\t * indices.\n\t *\n\t * @param {number} [h=indexh] Horizontal index of the target slide\n\t * @param {number} [v=indexv] Vertical index of the target slide\n\t * @param {number} [f] Index of a fragment within the\n\t * target slide to activate\n\t * @param {number} [origin] Origin for use in multimaster environments\n\t */\n\tfunction slide( h, v, f, origin ) {\n\n\t\t// Dispatch an event before hte slide\n\t\tconst slidechange = dispatchEvent({\n\t\t\ttype: 'beforeslidechange',\n\t\t\tdata: {\n\t\t\t\tindexh: h === undefined ? indexh : h,\n\t\t\t\tindexv: v === undefined ? indexv : v,\n\t\t\t\torigin\n\t\t\t}\n\t\t});\n\n\t\t// Abort if this slide change was prevented by an event listener\n\t\tif( slidechange.defaultPrevented ) return;\n\n\t\t// Remember where we were at before\n\t\tpreviousSlide = currentSlide;\n\n\t\t// Query all horizontal slides in the deck\n\t\tconst horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );\n\n\t\t// Abort if there are no slides\n\t\tif( horizontalSlides.length === 0 ) return;\n\n\t\t// If no vertical index is specified and the upcoming slide is a\n\t\t// stack, resume at its previous vertical index\n\t\tif( v === undefined && !overview.isActive() ) {\n\t\t\tv = getPreviousVerticalIndex( horizontalSlides[ h ] );\n\t\t}\n\n\t\t// If we were on a vertical stack, remember what vertical index\n\t\t// it was on so we can resume at the same position when returning\n\t\tif( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {\n\t\t\tsetPreviousVerticalIndex( previousSlide.parentNode, indexv );\n\t\t}\n\n\t\t// Remember the state before this slide\n\t\tconst stateBefore = state.concat();\n\n\t\t// Reset the state array\n\t\tstate.length = 0;\n\n\t\tlet indexhBefore = indexh || 0,\n\t\t\tindexvBefore = indexv || 0;\n\n\t\t// Activate and transition to the new slide\n\t\tindexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );\n\t\tindexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );\n\n\t\t// Dispatch an event if the slide changed\n\t\tlet slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );\n\n\t\t// Ensure that the previous slide is never the same as the current\n\t\tif( !slideChanged ) previousSlide = null;\n\n\t\t// Find the current horizontal slide and any possible vertical slides\n\t\t// within it\n\t\tlet currentHorizontalSlide = horizontalSlides[ indexh ],\n\t\t\tcurrentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );\n\n\t\t// Store references to the previous and current slides\n\t\tcurrentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;\n\n\t\tlet autoAnimateTransition = false;\n\n\t\t// Detect if we're moving between two auto-animated slides\n\t\tif( slideChanged && previousSlide && currentSlide && !overview.isActive() ) {\n\n\t\t\t// If this is an auto-animated transition, we disable the\n\t\t\t// regular slide transition\n\t\t\t//\n\t\t\t// Note 20-03-2020:\n\t\t\t// This needs to happen before we update slide visibility,\n\t\t\t// otherwise transitions will still run in Safari.\n\t\t\tif( previousSlide.hasAttribute( 'data-auto-animate' ) && currentSlide.hasAttribute( 'data-auto-animate' )\n\t\t\t\t\t&& previousSlide.getAttribute( 'data-auto-animate-id' ) === currentSlide.getAttribute( 'data-auto-animate-id' )\n\t\t\t\t\t&& !( ( indexh > indexhBefore || indexv > indexvBefore ) ? currentSlide : previousSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {\n\n\t\t\t\tautoAnimateTransition = true;\n\t\t\t\tdom.slides.classList.add( 'disable-slide-transitions' );\n\t\t\t}\n\n\t\t\ttransition = 'running';\n\n\t\t}\n\n\t\t// Update the visibility of slides now that the indices have changed\n\t\tupdateSlidesVisibility();\n\n\t\tlayout();\n\n\t\t// Update the overview if it's currently active\n\t\tif( overview.isActive() ) {\n\t\t\toverview.update();\n\t\t}\n\n\t\t// Show fragment, if specified\n\t\tif( typeof f !== 'undefined' ) {\n\t\t\tfragments.goto( f );\n\t\t}\n\n\t\t// Solves an edge case where the previous slide maintains the\n\t\t// 'present' class when navigating between adjacent vertical\n\t\t// stacks\n\t\tif( previousSlide && previousSlide !== currentSlide ) {\n\t\t\tpreviousSlide.classList.remove( 'present' );\n\t\t\tpreviousSlide.setAttribute( 'aria-hidden', 'true' );\n\n\t\t\t// Reset all slides upon navigate to home\n\t\t\tif( isFirstSlide() ) {\n\t\t\t\t// Launch async task\n\t\t\t\tsetTimeout( () => {\n\t\t\t\t\tgetVerticalStacks().forEach( slide => {\n\t\t\t\t\t\tsetPreviousVerticalIndex( slide, 0 );\n\t\t\t\t\t} );\n\t\t\t\t}, 0 );\n\t\t\t}\n\t\t}\n\n\t\t// Apply the new state\n\t\tstateLoop: for( let i = 0, len = state.length; i < len; i++ ) {\n\t\t\t// Check if this state existed on the previous slide. If it\n\t\t\t// did, we will avoid adding it repeatedly\n\t\t\tfor( let j = 0; j < stateBefore.length; j++ ) {\n\t\t\t\tif( stateBefore[j] === state[i] ) {\n\t\t\t\t\tstateBefore.splice( j, 1 );\n\t\t\t\t\tcontinue stateLoop;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdom.viewport.classList.add( state[i] );\n\n\t\t\t// Dispatch custom event matching the state's name\n\t\t\tdispatchEvent({ type: state[i] });\n\t\t}\n\n\t\t// Clean up the remains of the previous state\n\t\twhile( stateBefore.length ) {\n\t\t\tdom.viewport.classList.remove( stateBefore.pop() );\n\t\t}\n\n\t\tif( slideChanged ) {\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'slidechanged',\n\t\t\t\tdata: {\n\t\t\t\t\tindexh,\n\t\t\t\t\tindexv,\n\t\t\t\t\tpreviousSlide,\n\t\t\t\t\tcurrentSlide,\n\t\t\t\t\torigin\n\t\t\t\t}\n\t\t\t});\n\t\t}\n\n\t\t// Handle embedded content\n\t\tif( slideChanged || !previousSlide ) {\n\t\t\tslideContent.stopEmbeddedContent( previousSlide );\n\t\t\tslideContent.startEmbeddedContent( currentSlide );\n\t\t}\n\n\t\t// Announce the current slide contents to screen readers\n\t\t// Use animation frame to prevent getComputedStyle in getStatusText\n\t\t// from triggering layout mid-frame\n\t\trequestAnimationFrame( () => {\n\t\t\tannounceStatus( getStatusText( currentSlide ) );\n\t\t});\n\n\t\tprogress.update();\n\t\tcontrols.update();\n\t\tnotes.update();\n\t\tbackgrounds.update();\n\t\tbackgrounds.updateParallax();\n\t\tslideNumber.update();\n\t\tfragments.update();\n\n\t\t// Update the URL hash\n\t\tlocation.writeURL();\n\n\t\tcueAutoSlide();\n\n\t\t// Auto-animation\n\t\tif( autoAnimateTransition ) {\n\n\t\t\tsetTimeout( () => {\n\t\t\t\tdom.slides.classList.remove( 'disable-slide-transitions' );\n\t\t\t}, 0 );\n\n\t\t\tif( config.autoAnimate ) {\n\t\t\t\t// Run the auto-animation between our slides\n\t\t\t\tautoAnimate.run( previousSlide, currentSlide );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Syncs the presentation with the current DOM. Useful\n\t * when new slides or control elements are added or when\n\t * the configuration has changed.\n\t */\n\tfunction sync() {\n\n\t\t// Subscribe to input\n\t\tremoveEventListeners();\n\t\taddEventListeners();\n\n\t\t// Force a layout to make sure the current config is accounted for\n\t\tlayout();\n\n\t\t// Reflect the current autoSlide value\n\t\tautoSlide = config.autoSlide;\n\n\t\t// Start auto-sliding if it's enabled\n\t\tcueAutoSlide();\n\n\t\t// Re-create all slide backgrounds\n\t\tbackgrounds.create();\n\n\t\t// Write the current hash to the URL\n\t\tlocation.writeURL();\n\n\t\tfragments.sortAll();\n\n\t\tcontrols.update();\n\t\tprogress.update();\n\n\t\tupdateSlidesVisibility();\n\n\t\tnotes.update();\n\t\tnotes.updateVisibility();\n\t\tbackgrounds.update( true );\n\t\tslideNumber.update();\n\t\tslideContent.formatEmbeddedContent();\n\n\t\t// Start or stop embedded content depending on global config\n\t\tif( config.autoPlayMedia === false ) {\n\t\t\tslideContent.stopEmbeddedContent( currentSlide, { unloadIframes: false } );\n\t\t}\n\t\telse {\n\t\t\tslideContent.startEmbeddedContent( currentSlide );\n\t\t}\n\n\t\tif( overview.isActive() ) {\n\t\t\toverview.layout();\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates reveal.js to keep in sync with new slide attributes. For\n\t * example, if you add a new `data-background-image` you can call\n\t * this to have reveal.js render the new background image.\n\t *\n\t * Similar to #sync() but more efficient when you only need to\n\t * refresh a specific slide.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tfunction syncSlide( slide = currentSlide ) {\n\n\t\tbackgrounds.sync( slide );\n\t\tfragments.sync( slide );\n\n\t\tslideContent.load( slide );\n\n\t\tbackgrounds.update();\n\t\tnotes.update();\n\n\t}\n\n\t/**\n\t * Resets all vertical slides so that only the first\n\t * is visible.\n\t */\n\tfunction resetVerticalSlides() {\n\n\t\tgetHorizontalSlides().forEach( horizontalSlide => {\n\n\t\t\tUtil.queryAll( horizontalSlide, 'section' ).forEach( ( verticalSlide, y ) => {\n\n\t\t\t\tif( y > 0 ) {\n\t\t\t\t\tverticalSlide.classList.remove( 'present' );\n\t\t\t\t\tverticalSlide.classList.remove( 'past' );\n\t\t\t\t\tverticalSlide.classList.add( 'future' );\n\t\t\t\t\tverticalSlide.setAttribute( 'aria-hidden', 'true' );\n\t\t\t\t}\n\n\t\t\t} );\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Randomly shuffles all slides in the deck.\n\t */\n\tfunction shuffle( slides = getHorizontalSlides() ) {\n\n\t\tslides.forEach( ( slide, i ) => {\n\n\t\t\t// Insert the slide next to a randomly picked sibling slide\n\t\t\t// slide. This may cause the slide to insert before itself,\n\t\t\t// but that's not an issue.\n\t\t\tlet beforeSlide = slides[ Math.floor( Math.random() * slides.length ) ];\n\t\t\tif( beforeSlide.parentNode === slide.parentNode ) {\n\t\t\t\tslide.parentNode.insertBefore( slide, beforeSlide );\n\t\t\t}\n\n\t\t\t// Randomize the order of vertical slides (if there are any)\n\t\t\tlet verticalSlides = slide.querySelectorAll( 'section' );\n\t\t\tif( verticalSlides.length ) {\n\t\t\t\tshuffle( verticalSlides );\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Updates one dimension of slides by showing the slide\n\t * with the specified index.\n\t *\n\t * @param {string} selector A CSS selector that will fetch\n\t * the group of slides we are working with\n\t * @param {number} index The index of the slide that should be\n\t * shown\n\t *\n\t * @return {number} The index of the slide that is now shown,\n\t * might differ from the passed in index if it was out of\n\t * bounds.\n\t */\n\tfunction updateSlides( selector, index ) {\n\n\t\t// Select all slides and convert the NodeList result to\n\t\t// an array\n\t\tlet slides = Util.queryAll( dom.wrapper, selector ),\n\t\t\tslidesLength = slides.length;\n\n\t\tlet printMode = print.isPrintingPDF();\n\t\tlet loopedForwards = false;\n\t\tlet loopedBackwards = false;\n\n\t\tif( slidesLength ) {\n\n\t\t\t// Should the index loop?\n\t\t\tif( config.loop ) {\n\t\t\t\tif( index >= slidesLength ) loopedForwards = true;\n\n\t\t\t\tindex %= slidesLength;\n\n\t\t\t\tif( index < 0 ) {\n\t\t\t\t\tindex = slidesLength + index;\n\t\t\t\t\tloopedBackwards = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Enforce max and minimum index bounds\n\t\t\tindex = Math.max( Math.min( index, slidesLength - 1 ), 0 );\n\n\t\t\tfor( let i = 0; i < slidesLength; i++ ) {\n\t\t\t\tlet element = slides[i];\n\n\t\t\t\tlet reverse = config.rtl && !isVerticalSlide( element );\n\n\t\t\t\t// Avoid .remove() with multiple args for IE11 support\n\t\t\t\telement.classList.remove( 'past' );\n\t\t\t\telement.classList.remove( 'present' );\n\t\t\t\telement.classList.remove( 'future' );\n\n\t\t\t\t// http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute\n\t\t\t\telement.setAttribute( 'hidden', '' );\n\t\t\t\telement.setAttribute( 'aria-hidden', 'true' );\n\n\t\t\t\t// If this element contains vertical slides\n\t\t\t\tif( element.querySelector( 'section' ) ) {\n\t\t\t\t\telement.classList.add( 'stack' );\n\t\t\t\t}\n\n\t\t\t\t// If we're printing static slides, all slides are \"present\"\n\t\t\t\tif( printMode ) {\n\t\t\t\t\telement.classList.add( 'present' );\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif( i < index ) {\n\t\t\t\t\t// Any element previous to index is given the 'past' class\n\t\t\t\t\telement.classList.add( reverse ? 'future' : 'past' );\n\n\t\t\t\t\tif( config.fragments ) {\n\t\t\t\t\t\t// Show all fragments in prior slides\n\t\t\t\t\t\tshowFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( i > index ) {\n\t\t\t\t\t// Any element subsequent to index is given the 'future' class\n\t\t\t\t\telement.classList.add( reverse ? 'past' : 'future' );\n\n\t\t\t\t\tif( config.fragments ) {\n\t\t\t\t\t\t// Hide all fragments in future slides\n\t\t\t\t\t\thideFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Update the visibility of fragments when a presentation loops\n\t\t\t\t// in either direction\n\t\t\t\telse if( i === index && config.fragments ) {\n\t\t\t\t\tif( loopedForwards ) {\n\t\t\t\t\t\thideFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t\telse if( loopedBackwards ) {\n\t\t\t\t\t\tshowFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tlet slide = slides[index];\n\t\t\tlet wasPresent = slide.classList.contains( 'present' );\n\n\t\t\t// Mark the current slide as present\n\t\t\tslide.classList.add( 'present' );\n\t\t\tslide.removeAttribute( 'hidden' );\n\t\t\tslide.removeAttribute( 'aria-hidden' );\n\n\t\t\tif( !wasPresent ) {\n\t\t\t\t// Dispatch an event indicating the slide is now visible\n\t\t\t\tdispatchEvent({\n\t\t\t\t\ttarget: slide,\n\t\t\t\t\ttype: 'visible',\n\t\t\t\t\tbubbles: false\n\t\t\t\t});\n\t\t\t}\n\n\t\t\t// If this slide has a state associated with it, add it\n\t\t\t// onto the current state of the deck\n\t\t\tlet slideState = slide.getAttribute( 'data-state' );\n\t\t\tif( slideState ) {\n\t\t\t\tstate = state.concat( slideState.split( ' ' ) );\n\t\t\t}\n\n\t\t}\n\t\telse {\n\t\t\t// Since there are no slides we can't be anywhere beyond the\n\t\t\t// zeroth index\n\t\t\tindex = 0;\n\t\t}\n\n\t\treturn index;\n\n\t}\n\n\t/**\n\t * Shows all fragment elements within the given contaienr.\n\t */\n\tfunction showFragmentsIn( container ) {\n\n\t\tUtil.queryAll( container, '.fragment' ).forEach( fragment => {\n\t\t\tfragment.classList.add( 'visible' );\n\t\t\tfragment.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Hides all fragment elements within the given contaienr.\n\t */\n\tfunction hideFragmentsIn( container ) {\n\n\t\tUtil.queryAll( container, '.fragment.visible' ).forEach( fragment => {\n\t\t\tfragment.classList.remove( 'visible', 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Optimization method; hide all slides that are far away\n\t * from the present slide.\n\t */\n\tfunction updateSlidesVisibility() {\n\n\t\t// Select all slides and convert the NodeList result to\n\t\t// an array\n\t\tlet horizontalSlides = getHorizontalSlides(),\n\t\t\thorizontalSlidesLength = horizontalSlides.length,\n\t\t\tdistanceX,\n\t\t\tdistanceY;\n\n\t\tif( horizontalSlidesLength && typeof indexh !== 'undefined' ) {\n\n\t\t\t// The number of steps away from the present slide that will\n\t\t\t// be visible\n\t\t\tlet viewDistance = overview.isActive() ? 10 : config.viewDistance;\n\n\t\t\t// Shorten the view distance on devices that typically have\n\t\t\t// less resources\n\t\t\tif( Device.isMobile ) {\n\t\t\t\tviewDistance = overview.isActive() ? 6 : config.mobileViewDistance;\n\t\t\t}\n\n\t\t\t// All slides need to be visible when exporting to PDF\n\t\t\tif( print.isPrintingPDF() ) {\n\t\t\t\tviewDistance = Number.MAX_VALUE;\n\t\t\t}\n\n\t\t\tfor( let x = 0; x < horizontalSlidesLength; x++ ) {\n\t\t\t\tlet horizontalSlide = horizontalSlides[x];\n\n\t\t\t\tlet verticalSlides = Util.queryAll( horizontalSlide, 'section' ),\n\t\t\t\t\tverticalSlidesLength = verticalSlides.length;\n\n\t\t\t\t// Determine how far away this slide is from the present\n\t\t\t\tdistanceX = Math.abs( ( indexh || 0 ) - x ) || 0;\n\n\t\t\t\t// If the presentation is looped, distance should measure\n\t\t\t\t// 1 between the first and last slides\n\t\t\t\tif( config.loop ) {\n\t\t\t\t\tdistanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;\n\t\t\t\t}\n\n\t\t\t\t// Show the horizontal slide if it's within the view distance\n\t\t\t\tif( distanceX < viewDistance ) {\n\t\t\t\t\tslideContent.load( horizontalSlide );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tslideContent.unload( horizontalSlide );\n\t\t\t\t}\n\n\t\t\t\tif( verticalSlidesLength ) {\n\n\t\t\t\t\tlet oy = getPreviousVerticalIndex( horizontalSlide );\n\n\t\t\t\t\tfor( let y = 0; y < verticalSlidesLength; y++ ) {\n\t\t\t\t\t\tlet verticalSlide = verticalSlides[y];\n\n\t\t\t\t\t\tdistanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );\n\n\t\t\t\t\t\tif( distanceX + distanceY < viewDistance ) {\n\t\t\t\t\t\t\tslideContent.load( verticalSlide );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tslideContent.unload( verticalSlide );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Flag if there are ANY vertical slides, anywhere in the deck\n\t\t\tif( hasVerticalSlides() ) {\n\t\t\t\tdom.wrapper.classList.add( 'has-vertical-slides' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tdom.wrapper.classList.remove( 'has-vertical-slides' );\n\t\t\t}\n\n\t\t\t// Flag if there are ANY horizontal slides, anywhere in the deck\n\t\t\tif( hasHorizontalSlides() ) {\n\t\t\t\tdom.wrapper.classList.add( 'has-horizontal-slides' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tdom.wrapper.classList.remove( 'has-horizontal-slides' );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Determine what available routes there are for navigation.\n\t *\n\t * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}\n\t */\n\tfunction availableRoutes({ includeFragments = false } = {}) {\n\n\t\tlet horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),\n\t\t\tverticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );\n\n\t\tlet routes = {\n\t\t\tleft: indexh > 0,\n\t\t\tright: indexh < horizontalSlides.length - 1,\n\t\t\tup: indexv > 0,\n\t\t\tdown: indexv < verticalSlides.length - 1\n\t\t};\n\n\t\t// Looped presentations can always be navigated as long as\n\t\t// there are slides available\n\t\tif( config.loop ) {\n\t\t\tif( horizontalSlides.length > 1 ) {\n\t\t\t\troutes.left = true;\n\t\t\t\troutes.right = true;\n\t\t\t}\n\n\t\t\tif( verticalSlides.length > 1 ) {\n\t\t\t\troutes.up = true;\n\t\t\t\troutes.down = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( horizontalSlides.length > 1 && config.navigationMode === 'linear' ) {\n\t\t\troutes.right = routes.right || routes.down;\n\t\t\troutes.left = routes.left || routes.up;\n\t\t}\n\n\t\t// If includeFragments is set, a route will be considered\n\t\t// availalbe if either a slid OR fragment is available in\n\t\t// the given direction\n\t\tif( includeFragments === true ) {\n\t\t\tlet fragmentRoutes = fragments.availableRoutes();\n\t\t\troutes.left = routes.left || fragmentRoutes.prev;\n\t\t\troutes.up = routes.up || fragmentRoutes.prev;\n\t\t\troutes.down = routes.down || fragmentRoutes.next;\n\t\t\troutes.right = routes.right || fragmentRoutes.next;\n\t\t}\n\n\t\t// Reverse horizontal controls for rtl\n\t\tif( config.rtl ) {\n\t\t\tlet left = routes.left;\n\t\t\troutes.left = routes.right;\n\t\t\troutes.right = left;\n\t\t}\n\n\t\treturn routes;\n\n\t}\n\n\t/**\n\t * Returns the number of past slides. This can be used as a global\n\t * flattened index for slides.\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide we're counting before\n\t *\n\t * @return {number} Past slide count\n\t */\n\tfunction getSlidePastCount( slide = currentSlide ) {\n\n\t\tlet horizontalSlides = getHorizontalSlides();\n\n\t\t// The number of past slides\n\t\tlet pastCount = 0;\n\n\t\t// Step through all slides and count the past ones\n\t\tmainLoop: for( let i = 0; i < horizontalSlides.length; i++ ) {\n\n\t\t\tlet horizontalSlide = horizontalSlides[i];\n\t\t\tlet verticalSlides = horizontalSlide.querySelectorAll( 'section' );\n\n\t\t\tfor( let j = 0; j < verticalSlides.length; j++ ) {\n\n\t\t\t\t// Stop as soon as we arrive at the present\n\t\t\t\tif( verticalSlides[j] === slide ) {\n\t\t\t\t\tbreak mainLoop;\n\t\t\t\t}\n\n\t\t\t\t// Don't count slides with the \"uncounted\" class\n\t\t\t\tif( verticalSlides[j].dataset.visibility !== 'uncounted' ) {\n\t\t\t\t\tpastCount++;\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\t// Stop as soon as we arrive at the present\n\t\t\tif( horizontalSlide === slide ) {\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\t// Don't count the wrapping section for vertical slides and\n\t\t\t// slides marked as uncounted\n\t\t\tif( horizontalSlide.classList.contains( 'stack' ) === false && horizontalSlide.dataset.visibility !== 'uncounted' ) {\n\t\t\t\tpastCount++;\n\t\t\t}\n\n\t\t}\n\n\t\treturn pastCount;\n\n\t}\n\n\t/**\n\t * Returns a value ranging from 0-1 that represents\n\t * how far into the presentation we have navigated.\n\t *\n\t * @return {number}\n\t */\n\tfunction getProgress() {\n\n\t\t// The number of past and total slides\n\t\tlet totalCount = getTotalSlides();\n\t\tlet pastCount = getSlidePastCount();\n\n\t\tif( currentSlide ) {\n\n\t\t\tlet allFragments = currentSlide.querySelectorAll( '.fragment' );\n\n\t\t\t// If there are fragments in the current slide those should be\n\t\t\t// accounted for in the progress.\n\t\t\tif( allFragments.length > 0 ) {\n\t\t\t\tlet visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );\n\n\t\t\t\t// This value represents how big a portion of the slide progress\n\t\t\t\t// that is made up by its fragments (0-1)\n\t\t\t\tlet fragmentWeight = 0.9;\n\n\t\t\t\t// Add fragment progress to the past slide count\n\t\t\t\tpastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;\n\t\t\t}\n\n\t\t}\n\n\t\treturn Math.min( pastCount / ( totalCount - 1 ), 1 );\n\n\t}\n\n\t/**\n\t * Retrieves the h/v location and fragment of the current,\n\t * or specified, slide.\n\t *\n\t * @param {HTMLElement} [slide] If specified, the returned\n\t * index will be for this slide rather than the currently\n\t * active one\n\t *\n\t * @return {{h: number, v: number, f: number}}\n\t */\n\tfunction getIndices( slide ) {\n\n\t\t// By default, return the current indices\n\t\tlet h = indexh,\n\t\t\tv = indexv,\n\t\t\tf;\n\n\t\t// If a slide is specified, return the indices of that slide\n\t\tif( slide ) {\n\t\t\tlet isVertical = isVerticalSlide( slide );\n\t\t\tlet slideh = isVertical ? slide.parentNode : slide;\n\n\t\t\t// Select all horizontal slides\n\t\t\tlet horizontalSlides = getHorizontalSlides();\n\n\t\t\t// Now that we know which the horizontal slide is, get its index\n\t\t\th = Math.max( horizontalSlides.indexOf( slideh ), 0 );\n\n\t\t\t// Assume we're not vertical\n\t\t\tv = undefined;\n\n\t\t\t// If this is a vertical slide, grab the vertical index\n\t\t\tif( isVertical ) {\n\t\t\t\tv = Math.max( Util.queryAll( slide.parentNode, 'section' ).indexOf( slide ), 0 );\n\t\t\t}\n\t\t}\n\n\t\tif( !slide && currentSlide ) {\n\t\t\tlet hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;\n\t\t\tif( hasFragments ) {\n\t\t\t\tlet currentFragment = currentSlide.querySelector( '.current-fragment' );\n\t\t\t\tif( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\t\tf = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tf = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn { h, v, f };\n\n\t}\n\n\t/**\n\t * Retrieves all slides in this presentation.\n\t */\n\tfunction getSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, SLIDES_SELECTOR + ':not(.stack):not([data-visibility=\"uncounted\"])' );\n\n\t}\n\n\t/**\n\t * Returns a list of all horizontal slides in the deck. Each\n\t * vertical stack is included as one horizontal slide in the\n\t * resulting array.\n\t */\n\tfunction getHorizontalSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR );\n\n\t}\n\n\t/**\n\t * Returns all vertical slides that exist within this deck.\n\t */\n\tfunction getVerticalSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, '.slides>section>section' );\n\n\t}\n\n\t/**\n\t * Returns all vertical stacks (each stack can contain multiple slides).\n\t */\n\tfunction getVerticalStacks() {\n\n\t\treturn Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.stack');\n\n\t}\n\n\t/**\n\t * Returns true if there are at least two horizontal slides.\n\t */\n\tfunction hasHorizontalSlides() {\n\n\t\treturn getHorizontalSlides().length > 1;\n\t}\n\n\t/**\n\t * Returns true if there are at least two vertical slides.\n\t */\n\tfunction hasVerticalSlides() {\n\n\t\treturn getVerticalSlides().length > 1;\n\n\t}\n\n\t/**\n\t * Returns an array of objects where each object represents the\n\t * attributes on its respective slide.\n\t */\n\tfunction getSlidesAttributes() {\n\n\t\treturn getSlides().map( slide => {\n\n\t\t\tlet attributes = {};\n\t\t\tfor( let i = 0; i < slide.attributes.length; i++ ) {\n\t\t\t\tlet attribute = slide.attributes[ i ];\n\t\t\t\tattributes[ attribute.name ] = attribute.value;\n\t\t\t}\n\t\t\treturn attributes;\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Retrieves the total number of slides in this presentation.\n\t *\n\t * @return {number}\n\t */\n\tfunction getTotalSlides() {\n\n\t\treturn getSlides().length;\n\n\t}\n\n\t/**\n\t * Returns the slide element matching the specified index.\n\t *\n\t * @return {HTMLElement}\n\t */\n\tfunction getSlide( x, y ) {\n\n\t\tlet horizontalSlide = getHorizontalSlides()[ x ];\n\t\tlet verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );\n\n\t\tif( verticalSlides && verticalSlides.length && typeof y === 'number' ) {\n\t\t\treturn verticalSlides ? verticalSlides[ y ] : undefined;\n\t\t}\n\n\t\treturn horizontalSlide;\n\n\t}\n\n\t/**\n\t * Returns the background element for the given slide.\n\t * All slides, even the ones with no background properties\n\t * defined, have a background element so as long as the\n\t * index is valid an element will be returned.\n\t *\n\t * @param {mixed} x Horizontal background index OR a slide\n\t * HTML element\n\t * @param {number} y Vertical background index\n\t * @return {(HTMLElement[]|*)}\n\t */\n\tfunction getSlideBackground( x, y ) {\n\n\t\tlet slide = typeof x === 'number' ? getSlide( x, y ) : x;\n\t\tif( slide ) {\n\t\t\treturn slide.slideBackgroundElement;\n\t\t}\n\n\t\treturn undefined;\n\n\t}\n\n\t/**\n\t * Retrieves the current state of the presentation as\n\t * an object. This state can then be restored at any\n\t * time.\n\t *\n\t * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}\n\t */\n\tfunction getState() {\n\n\t\tlet indices = getIndices();\n\n\t\treturn {\n\t\t\tindexh: indices.h,\n\t\t\tindexv: indices.v,\n\t\t\tindexf: indices.f,\n\t\t\tpaused: isPaused(),\n\t\t\toverview: overview.isActive()\n\t\t};\n\n\t}\n\n\t/**\n\t * Restores the presentation to the given state.\n\t *\n\t * @param {object} state As generated by getState()\n\t * @see {@link getState} generates the parameter `state`\n\t */\n\tfunction setState( state ) {\n\n\t\tif( typeof state === 'object' ) {\n\t\t\tslide( Util.deserialize( state.indexh ), Util.deserialize( state.indexv ), Util.deserialize( state.indexf ) );\n\n\t\t\tlet pausedFlag = Util.deserialize( state.paused ),\n\t\t\t\toverviewFlag = Util.deserialize( state.overview );\n\n\t\t\tif( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {\n\t\t\t\ttogglePause( pausedFlag );\n\t\t\t}\n\n\t\t\tif( typeof overviewFlag === 'boolean' && overviewFlag !== overview.isActive() ) {\n\t\t\t\toverview.toggle( overviewFlag );\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Cues a new automated slide if enabled in the config.\n\t */\n\tfunction cueAutoSlide() {\n\n\t\tcancelAutoSlide();\n\n\t\tif( currentSlide && config.autoSlide !== false ) {\n\n\t\t\tlet fragment = currentSlide.querySelector( '.current-fragment' );\n\n\t\t\t// When the slide first appears there is no \"current\" fragment so\n\t\t\t// we look for a data-autoslide timing on the first fragment\n\t\t\tif( !fragment ) fragment = currentSlide.querySelector( '.fragment' );\n\n\t\t\tlet fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;\n\t\t\tlet parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;\n\t\t\tlet slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );\n\n\t\t\t// Pick value in the following priority order:\n\t\t\t// 1. Current fragment's data-autoslide\n\t\t\t// 2. Current slide's data-autoslide\n\t\t\t// 3. Parent slide's data-autoslide\n\t\t\t// 4. Global autoSlide setting\n\t\t\tif( fragmentAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( fragmentAutoSlide, 10 );\n\t\t\t}\n\t\t\telse if( slideAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( slideAutoSlide, 10 );\n\t\t\t}\n\t\t\telse if( parentAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( parentAutoSlide, 10 );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tautoSlide = config.autoSlide;\n\n\t\t\t\t// If there are media elements with data-autoplay,\n\t\t\t\t// automatically set the autoSlide duration to the\n\t\t\t\t// length of that media. Not applicable if the slide\n\t\t\t\t// is divided up into fragments.\n\t\t\t\t// playbackRate is accounted for in the duration.\n\t\t\t\tif( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {\n\t\t\t\t\tUtil.queryAll( currentSlide, 'video, audio' ).forEach( el => {\n\t\t\t\t\t\tif( el.hasAttribute( 'data-autoplay' ) ) {\n\t\t\t\t\t\t\tif( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {\n\t\t\t\t\t\t\t\tautoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Cue the next auto-slide if:\n\t\t\t// - There is an autoSlide value\n\t\t\t// - Auto-sliding isn't paused by the user\n\t\t\t// - The presentation isn't paused\n\t\t\t// - The overview isn't active\n\t\t\t// - The presentation isn't over\n\t\t\tif( autoSlide && !autoSlidePaused && !isPaused() && !overview.isActive() && ( !isLastSlide() || fragments.availableRoutes().next || config.loop === true ) ) {\n\t\t\t\tautoSlideTimeout = setTimeout( () => {\n\t\t\t\t\tif( typeof config.autoSlideMethod === 'function' ) {\n\t\t\t\t\t\tconfig.autoSlideMethod()\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tnavigateNext();\n\t\t\t\t\t}\n\t\t\t\t\tcueAutoSlide();\n\t\t\t\t}, autoSlide );\n\t\t\t\tautoSlideStartTime = Date.now();\n\t\t\t}\n\n\t\t\tif( autoSlidePlayer ) {\n\t\t\t\tautoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Cancels any ongoing request to auto-slide.\n\t */\n\tfunction cancelAutoSlide() {\n\n\t\tclearTimeout( autoSlideTimeout );\n\t\tautoSlideTimeout = -1;\n\n\t}\n\n\tfunction pauseAutoSlide() {\n\n\t\tif( autoSlide && !autoSlidePaused ) {\n\t\t\tautoSlidePaused = true;\n\t\t\tdispatchEvent({ type: 'autoslidepaused' });\n\t\t\tclearTimeout( autoSlideTimeout );\n\n\t\t\tif( autoSlidePlayer ) {\n\t\t\t\tautoSlidePlayer.setPlaying( false );\n\t\t\t}\n\t\t}\n\n\t}\n\n\tfunction resumeAutoSlide() {\n\n\t\tif( autoSlide && autoSlidePaused ) {\n\t\t\tautoSlidePaused = false;\n\t\t\tdispatchEvent({ type: 'autoslideresumed' });\n\t\t\tcueAutoSlide();\n\t\t}\n\n\t}\n\n\tfunction navigateLeft({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\n\t\t// Reverse for RTL\n\t\tif( config.rtl ) {\n\t\t\tif( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().left ) {\n\t\t\t\tslide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t\t}\n\t\t}\n\t\t// Normal navigation\n\t\telse if( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().left ) {\n\t\t\tslide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t}\n\n\t}\n\n\tfunction navigateRight({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\n\t\t// Reverse for RTL\n\t\tif( config.rtl ) {\n\t\t\tif( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().right ) {\n\t\t\t\tslide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t\t}\n\t\t}\n\t\t// Normal navigation\n\t\telse if( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().right ) {\n\t\t\tslide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t}\n\n\t}\n\n\tfunction navigateUp({skipFragments=false}={}) {\n\n\t\t// Prioritize hiding fragments\n\t\tif( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().up ) {\n\t\t\tslide( indexh, indexv - 1 );\n\t\t}\n\n\t}\n\n\tfunction navigateDown({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedVertically = true;\n\n\t\t// Prioritize revealing fragments\n\t\tif( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().down ) {\n\t\t\tslide( indexh, indexv + 1 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Navigates backwards, prioritized in the following order:\n\t * 1) Previous fragment\n\t * 2) Previous vertical slide\n\t * 3) Previous horizontal slide\n\t */\n\tfunction navigatePrev({skipFragments=false}={}) {\n\n\t\t// Prioritize revealing fragments\n\t\tif( skipFragments || fragments.prev() === false ) {\n\t\t\tif( availableRoutes().up ) {\n\t\t\t\tnavigateUp({skipFragments});\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// Fetch the previous horizontal slide, if there is one\n\t\t\t\tlet previousSlide;\n\n\t\t\t\tif( config.rtl ) {\n\t\t\t\t\tpreviousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.future' ).pop();\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tpreviousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.past' ).pop();\n\t\t\t\t}\n\n\t\t\t\t// When going backwards and arriving on a stack we start\n\t\t\t\t// at the bottom of the stack\n\t\t\t\tif( previousSlide && previousSlide.classList.contains( 'stack' ) ) {\n\t\t\t\t\tlet v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;\n\t\t\t\t\tlet h = indexh - 1;\n\t\t\t\t\tslide( h, v );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tnavigateLeft({skipFragments});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * The reverse of #navigatePrev().\n\t */\n\tfunction navigateNext({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\t\tnavigationHistory.hasNavigatedVertically = true;\n\n\t\t// Prioritize revealing fragments\n\t\tif( skipFragments || fragments.next() === false ) {\n\n\t\t\tlet routes = availableRoutes();\n\n\t\t\t// When looping is enabled `routes.down` is always available\n\t\t\t// so we need a separate check for when we've reached the\n\t\t\t// end of a stack and should move horizontally\n\t\t\tif( routes.down && routes.right && config.loop && isLastVerticalSlide() ) {\n\t\t\t\troutes.down = false;\n\t\t\t}\n\n\t\t\tif( routes.down ) {\n\t\t\t\tnavigateDown({skipFragments});\n\t\t\t}\n\t\t\telse if( config.rtl ) {\n\t\t\t\tnavigateLeft({skipFragments});\n\t\t\t}\n\t\t\telse {\n\t\t\t\tnavigateRight({skipFragments});\n\t\t\t}\n\t\t}\n\n\t}\n\n\n\t// --------------------------------------------------------------------//\n\t// ----------------------------- EVENTS -------------------------------//\n\t// --------------------------------------------------------------------//\n\n\t/**\n\t * Called by all event handlers that are based on user\n\t * input.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onUserInput( event ) {\n\n\t\tif( config.autoSlideStoppable ) {\n\t\t\tpauseAutoSlide();\n\t\t}\n\n\t}\n\n\t/**\n\t* Listener for post message events posted to this window.\n\t*/\n\tfunction onPostMessage( event ) {\n\n\t\tlet data = event.data;\n\n\t\t// Make sure we're dealing with JSON\n\t\tif( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {\n\t\t\tdata = JSON.parse( data );\n\n\t\t\t// Check if the requested method can be found\n\t\t\tif( data.method && typeof Reveal[data.method] === 'function' ) {\n\n\t\t\t\tif( POST_MESSAGE_METHOD_BLACKLIST.test( data.method ) === false ) {\n\n\t\t\t\t\tconst result = Reveal[data.method].apply( Reveal, data.args );\n\n\t\t\t\t\t// Dispatch a postMessage event with the returned value from\n\t\t\t\t\t// our method invocation for getter functions\n\t\t\t\t\tdispatchPostMessage( 'callback', { method: data.method, result: result } );\n\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tconsole.warn( 'reveal.js: \"'+ data.method +'\" is is blacklisted from the postMessage API' );\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Event listener for transition end on the current slide.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onTransitionEnd( event ) {\n\n\t\tif( transition === 'running' && /section/gi.test( event.target.nodeName ) ) {\n\t\t\ttransition = 'idle';\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'slidetransitionend',\n\t\t\t\tdata: { indexh, indexv, previousSlide, currentSlide }\n\t\t\t});\n\t\t}\n\n\t}\n\n\t/**\n\t * A global listener for all click events inside of the\n\t * .slides container.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onSlidesClicked( event ) {\n\n\t\tconst anchor = Util.closest( event.target, 'a[href^=\"#\"]' );\n\n\t\t// If a hash link is clicked, we find the target slide\n\t\t// and navigate to it. We previously relied on 'hashchange'\n\t\t// for links like these but that prevented media with\n\t\t// audio tracks from playing in mobile browsers since it\n\t\t// wasn't considered a direct interaction with the document.\n\t\tif( anchor ) {\n\t\t\tconst hash = anchor.getAttribute( 'href' );\n\t\t\tconst indices = location.getIndicesFromHash( hash );\n\n\t\t\tif( indices ) {\n\t\t\t\tReveal.slide( indices.h, indices.v, indices.f );\n\t\t\t\tevent.preventDefault();\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the window level 'resize' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onWindowResize( event ) {\n\n\t\tlayout();\n\n\t}\n\n\t/**\n\t * Handle for the window level 'visibilitychange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onPageVisibilityChange( event ) {\n\n\t\t// If, after clicking a link or similar and we're coming back,\n\t\t// focus the document.body to ensure we can use keyboard shortcuts\n\t\tif( document.hidden === false && document.activeElement !== document.body ) {\n\t\t\t// Not all elements support .blur() - SVGs among them.\n\t\t\tif( typeof document.activeElement.blur === 'function' ) {\n\t\t\t\tdocument.activeElement.blur();\n\t\t\t}\n\t\t\tdocument.body.focus();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the document level 'fullscreenchange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onFullscreenChange( event ) {\n\n\t\tlet element = document.fullscreenElement || document.webkitFullscreenElement;\n\t\tif( element === dom.wrapper ) {\n\t\t\tevent.stopImmediatePropagation();\n\n\t\t\t// Timeout to avoid layout shift in Safari\n\t\t\tsetTimeout( () => {\n\t\t\t\tReveal.layout();\n\t\t\t\tReveal.focus.focus(); // focus.focus :'(\n\t\t\t}, 1 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Handles clicks on links that are set to preview in the\n\t * iframe overlay.\n\t *\n\t * @param {object} event\n\t */\n\tfunction onPreviewLinkClicked( event ) {\n\n\t\tif( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {\n\t\t\tlet url = event.currentTarget.getAttribute( 'href' );\n\t\t\tif( url ) {\n\t\t\t\tshowPreview( url );\n\t\t\t\tevent.preventDefault();\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Handles click on the auto-sliding controls element.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onAutoSlidePlayerClick( event ) {\n\n\t\t// Replay\n\t\tif( isLastSlide() && config.loop === false ) {\n\t\t\tslide( 0, 0 );\n\t\t\tresumeAutoSlide();\n\t\t}\n\t\t// Resume\n\t\telse if( autoSlidePaused ) {\n\t\t\tresumeAutoSlide();\n\t\t}\n\t\t// Pause\n\t\telse {\n\t\t\tpauseAutoSlide();\n\t\t}\n\n\t}\n\n\n\t// --------------------------------------------------------------------//\n\t// ------------------------------- API --------------------------------//\n\t// --------------------------------------------------------------------//\n\n\t// The public reveal.js API\n\tconst API = {\n\t\tVERSION,\n\n\t\tinitialize,\n\t\tconfigure,\n\t\tdestroy,\n\n\t\tsync,\n\t\tsyncSlide,\n\t\tsyncFragments: fragments.sync.bind( fragments ),\n\n\t\t// Navigation methods\n\t\tslide,\n\t\tleft: navigateLeft,\n\t\tright: navigateRight,\n\t\tup: navigateUp,\n\t\tdown: navigateDown,\n\t\tprev: navigatePrev,\n\t\tnext: navigateNext,\n\n\t\t// Navigation aliases\n\t\tnavigateLeft, navigateRight, navigateUp, navigateDown, navigatePrev, navigateNext,\n\n\t\t// Fragment methods\n\t\tnavigateFragment: fragments.goto.bind( fragments ),\n\t\tprevFragment: fragments.prev.bind( fragments ),\n\t\tnextFragment: fragments.next.bind( fragments ),\n\n\t\t// Event binding\n\t\ton,\n\t\toff,\n\n\t\t// Legacy event binding methods left in for backwards compatibility\n\t\taddEventListener: on,\n\t\tremoveEventListener: off,\n\n\t\t// Forces an update in slide layout\n\t\tlayout,\n\n\t\t// Randomizes the order of slides\n\t\tshuffle,\n\n\t\t// Returns an object with the available routes as booleans (left/right/top/bottom)\n\t\tavailableRoutes,\n\n\t\t// Returns an object with the available fragments as booleans (prev/next)\n\t\tavailableFragments: fragments.availableRoutes.bind( fragments ),\n\n\t\t// Toggles a help overlay with keyboard shortcuts\n\t\ttoggleHelp,\n\n\t\t// Toggles the overview mode on/off\n\t\ttoggleOverview: overview.toggle.bind( overview ),\n\n\t\t// Toggles the \"black screen\" mode on/off\n\t\ttogglePause,\n\n\t\t// Toggles the auto slide mode on/off\n\t\ttoggleAutoSlide,\n\n\t\t// Slide navigation checks\n\t\tisFirstSlide,\n\t\tisLastSlide,\n\t\tisLastVerticalSlide,\n\t\tisVerticalSlide,\n\n\t\t// State checks\n\t\tisPaused,\n\t\tisAutoSliding,\n\t\tisSpeakerNotes: notes.isSpeakerNotesWindow.bind( notes ),\n\t\tisOverview: overview.isActive.bind( overview ),\n\t\tisFocused: focus.isFocused.bind( focus ),\n\t\tisPrintingPDF: print.isPrintingPDF.bind( print ),\n\n\t\t// Checks if reveal.js has been loaded and is ready for use\n\t\tisReady: () => ready,\n\n\t\t// Slide preloading\n\t\tloadSlide: slideContent.load.bind( slideContent ),\n\t\tunloadSlide: slideContent.unload.bind( slideContent ),\n\n\t\t// Preview management\n\t\tshowPreview,\n\t\thidePreview: closeOverlay,\n\n\t\t// Adds or removes all internal event listeners\n\t\taddEventListeners,\n\t\tremoveEventListeners,\n\t\tdispatchEvent,\n\n\t\t// Facility for persisting and restoring the presentation state\n\t\tgetState,\n\t\tsetState,\n\n\t\t// Presentation progress on range of 0-1\n\t\tgetProgress,\n\n\t\t// Returns the indices of the current, or specified, slide\n\t\tgetIndices,\n\n\t\t// Returns an Array of key:value maps of the attributes of each\n\t\t// slide in the deck\n\t\tgetSlidesAttributes,\n\n\t\t// Returns the number of slides that we have passed\n\t\tgetSlidePastCount,\n\n\t\t// Returns the total number of slides\n\t\tgetTotalSlides,\n\n\t\t// Returns the slide element at the specified index\n\t\tgetSlide,\n\n\t\t// Returns the previous slide element, may be null\n\t\tgetPreviousSlide: () => previousSlide,\n\n\t\t// Returns the current slide element\n\t\tgetCurrentSlide: () => currentSlide,\n\n\t\t// Returns the slide background element at the specified index\n\t\tgetSlideBackground,\n\n\t\t// Returns the speaker notes string for a slide, or null\n\t\tgetSlideNotes: notes.getSlideNotes.bind( notes ),\n\n\t\t// Returns an Array of all slides\n\t\tgetSlides,\n\n\t\t// Returns an array with all horizontal/vertical slides in the deck\n\t\tgetHorizontalSlides,\n\t\tgetVerticalSlides,\n\n\t\t// Checks if the presentation contains two or more horizontal\n\t\t// and vertical slides\n\t\thasHorizontalSlides,\n\t\thasVerticalSlides,\n\n\t\t// Checks if the deck has navigated on either axis at least once\n\t\thasNavigatedHorizontally: () => navigationHistory.hasNavigatedHorizontally,\n\t\thasNavigatedVertically: () => navigationHistory.hasNavigatedVertically,\n\n\t\t// Adds/removes a custom key binding\n\t\taddKeyBinding: keyboard.addKeyBinding.bind( keyboard ),\n\t\tremoveKeyBinding: keyboard.removeKeyBinding.bind( keyboard ),\n\n\t\t// Programmatically triggers a keyboard event\n\t\ttriggerKey: keyboard.triggerKey.bind( keyboard ),\n\n\t\t// Registers a new shortcut to include in the help overlay\n\t\tregisterKeyboardShortcut: keyboard.registerKeyboardShortcut.bind( keyboard ),\n\n\t\tgetComputedSlideSize,\n\n\t\t// Returns the current scale of the presentation content\n\t\tgetScale: () => scale,\n\n\t\t// Returns the current configuration object\n\t\tgetConfig: () => config,\n\n\t\t// Helper method, retrieves query string as a key:value map\n\t\tgetQueryHash: Util.getQueryHash,\n\n\t\t// Returns the path to the current slide as represented in the URL\n\t\tgetSlidePath: location.getHash.bind( location ),\n\n\t\t// Returns reveal.js DOM elements\n\t\tgetRevealElement: () => revealElement,\n\t\tgetSlidesElement: () => dom.slides,\n\t\tgetViewportElement: () => dom.viewport,\n\t\tgetBackgroundsElement: () => backgrounds.element,\n\n\t\t// API for registering and retrieving plugins\n\t\tregisterPlugin: plugins.registerPlugin.bind( plugins ),\n\t\thasPlugin: plugins.hasPlugin.bind( plugins ),\n\t\tgetPlugin: plugins.getPlugin.bind( plugins ),\n\t\tgetPlugins: plugins.getRegisteredPlugins.bind( plugins )\n\n\t};\n\n\t// Our internal API which controllers have access to\n\tUtil.extend( Reveal, {\n\t\t...API,\n\n\t\t// Methods for announcing content to screen readers\n\t\tannounceStatus,\n\t\tgetStatusText,\n\n\t\t// Controllers\n\t\tprint,\n\t\tfocus,\n\t\tprogress,\n\t\tcontrols,\n\t\tlocation,\n\t\toverview,\n\t\tfragments,\n\t\tslideContent,\n\t\tslideNumber,\n\n\t\tonUserInput,\n\t\tcloseOverlay,\n\t\tupdateSlidesVisibility,\n\t\tlayoutSlideContents,\n\t\ttransformSlides,\n\t\tcueAutoSlide,\n\t\tcancelAutoSlide\n\t} );\n\n\treturn API;\n\n};\n","import Deck, { VERSION } from './reveal.js'\n\n/**\n * Expose the Reveal class to the window. To create a\n * new instance:\n * let deck = new Reveal( document.querySelector( '.reveal' ), {\n *   controls: false\n * } );\n * deck.initialize().then(() => {\n *   // reveal.js is ready\n * });\n */\nlet Reveal = Deck;\n\n\n/**\n * The below is a thin shell that mimics the pre 4.0\n * reveal.js API and ensures backwards compatibility.\n * This API only allows for one Reveal instance per\n * page, whereas the new API above lets you run many\n * presentations on the same page.\n *\n * Reveal.initialize( { controls: false } ).then(() => {\n *   // reveal.js is ready\n * });\n */\n\nlet enqueuedAPICalls = [];\n\nReveal.initialize = options => {\n\n\t// Create our singleton reveal.js instance\n\tObject.assign( Reveal, new Deck( document.querySelector( '.reveal' ), options ) );\n\n\t// Invoke any enqueued API calls\n\tenqueuedAPICalls.map( method => method( Reveal ) );\n\n\treturn Reveal.initialize();\n\n}\n\n/**\n * The pre 4.0 API let you add event listener before\n * initializing. We maintain the same behavior by\n * queuing up premature API calls and invoking all\n * of them when Reveal.initialize is called.\n */\n[ 'configure', 'on', 'off', 'addEventListener', 'removeEventListener', 'registerPlugin' ].forEach( method => {\n\tReveal[method] = ( ...args ) => {\n\t\tenqueuedAPICalls.push( deck => deck[method].call( null, ...args ) );\n\t}\n} );\n\nReveal.isReady = () => false;\n\nReveal.VERSION = VERSION;\n\nexport default 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check = function (it) {\n  return it && it.Math == Math && it;\n};\n\n// https://github.com/zloirock/core-js/issues/86#issuecomment-115759028\nmodule.exports =\n  // eslint-disable-next-line es/no-global-this -- safe\n  check(typeof globalThis == 'object' && globalThis) ||\n  check(typeof window == 'object' && window) ||\n  // eslint-disable-next-line no-restricted-globals -- safe\n  check(typeof self == 'object' && self) ||\n  check(typeof global == 'object' && global) ||\n  // eslint-disable-next-line no-new-func -- fallback\n  (function () { return this; })() || Function('return this')();\n","module.exports = function (exec) {\n  try {\n    return !!exec();\n  } catch (error) {\n    return true;\n  }\n};\n","var fails = require('../internals/fails');\n\n// Detect IE8's incomplete defineProperty implementation\nmodule.exports = !fails(function () {\n  // eslint-disable-next-line es/no-object-defineproperty -- required for testing\n  return Object.defineProperty({}, 1, { get: function () { return 7; } })[1] != 7;\n});\n","'use strict';\nvar $propertyIsEnumerable = {}.propertyIsEnumerable;\n// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe\nvar getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;\n\n// Nashorn ~ JDK8 bug\nvar NASHORN_BUG = getOwnPropertyDescriptor && !$propertyIsEnumerable.call({ 1: 2 }, 1);\n\n// `Object.prototype.propertyIsEnumerable` method implementation\n// https://tc39.es/ecma262/#sec-object.prototype.propertyisenumerable\nexports.f = NASHORN_BUG ? function propertyIsEnumerable(V) {\n  var descriptor = getOwnPropertyDescriptor(this, V);\n  return !!descriptor && descriptor.enumerable;\n} : $propertyIsEnumerable;\n","module.exports = function (bitmap, value) {\n  return {\n    enumerable: !(bitmap & 1),\n    configurable: !(bitmap & 2),\n    writable: !(bitmap & 4),\n    value: value\n  };\n};\n","var toString = {}.toString;\n\nmodule.exports = function (it) {\n  return toString.call(it).slice(8, -1);\n};\n","var fails = require('../internals/fails');\nvar classof = require('../internals/classof-raw');\n\nvar split = ''.split;\n\n// fallback for non-array-like ES3 and non-enumerable old V8 strings\nmodule.exports = fails(function () {\n  // throws an error in rhino, see https://github.com/mozilla/rhino/issues/346\n  // eslint-disable-next-line no-prototype-builtins -- safe\n  return !Object('z').propertyIsEnumerable(0);\n}) ? function (it) {\n  return classof(it) == 'String' ? split.call(it, '') : Object(it);\n} : Object;\n","// `RequireObjectCoercible` abstract operation\n// https://tc39.es/ecma262/#sec-requireobjectcoercible\nmodule.exports = function (it) {\n  if (it == undefined) throw TypeError(\"Can't call method on \" + it);\n  return it;\n};\n","// toObject with fallback for non-array-like ES3 strings\nvar IndexedObject = require('../internals/indexed-object');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\n\nmodule.exports = function (it) {\n  return IndexedObject(requireObjectCoercible(it));\n};\n","module.exports = function (it) {\n  return typeof it === 'object' ? it !== null : typeof it === 'function';\n};\n","var isObject = require('../internals/is-object');\n\n// `ToPrimitive` abstract operation\n// https://tc39.es/ecma262/#sec-toprimitive\n// instead of the ES6 spec version, we didn't implement @@toPrimitive case\n// and the second argument - flag - preferred type is a string\nmodule.exports = function (input, PREFERRED_STRING) {\n  if (!isObject(input)) return input;\n  var fn, val;\n  if (PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;\n  if (typeof (fn = input.valueOf) == 'function' && !isObject(val = fn.call(input))) return val;\n  if (!PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;\n  throw TypeError(\"Can't convert object to primitive value\");\n};\n","var requireObjectCoercible = require('../internals/require-object-coercible');\n\n// `ToObject` abstract operation\n// https://tc39.es/ecma262/#sec-toobject\nmodule.exports = function (argument) {\n  return Object(requireObjectCoercible(argument));\n};\n","var toObject = require('../internals/to-object');\n\nvar hasOwnProperty = {}.hasOwnProperty;\n\nmodule.exports = function hasOwn(it, key) {\n  return hasOwnProperty.call(toObject(it), key);\n};\n","var global = require('../internals/global');\nvar isObject = require('../internals/is-object');\n\nvar document = global.document;\n// typeof document.createElement is 'object' in old IE\nvar EXISTS = isObject(document) && isObject(document.createElement);\n\nmodule.exports = function (it) {\n  return EXISTS ? document.createElement(it) : {};\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar fails = require('../internals/fails');\nvar createElement = require('../internals/document-create-element');\n\n// Thank's IE8 for his funny defineProperty\nmodule.exports = !DESCRIPTORS && !fails(function () {\n  // eslint-disable-next-line es/no-object-defineproperty -- requied for testing\n  return Object.defineProperty(createElement('div'), 'a', {\n    get: function () { return 7; }\n  }).a != 7;\n});\n","var DESCRIPTORS = require('../internals/descriptors');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar toPrimitive = require('../internals/to-primitive');\nvar has = require('../internals/has');\nvar IE8_DOM_DEFINE = require('../internals/ie8-dom-define');\n\n// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe\nvar $getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;\n\n// `Object.getOwnPropertyDescriptor` method\n// https://tc39.es/ecma262/#sec-object.getownpropertydescriptor\nexports.f = DESCRIPTORS ? $getOwnPropertyDescriptor : function getOwnPropertyDescriptor(O, P) {\n  O = toIndexedObject(O);\n  P = toPrimitive(P, true);\n  if (IE8_DOM_DEFINE) try {\n    return $getOwnPropertyDescriptor(O, P);\n  } catch (error) { /* empty */ }\n  if (has(O, P)) return createPropertyDescriptor(!propertyIsEnumerableModule.f.call(O, P), O[P]);\n};\n","var isObject = require('../internals/is-object');\n\nmodule.exports = function (it) {\n  if (!isObject(it)) {\n    throw TypeError(String(it) + ' is not an object');\n  } return it;\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar IE8_DOM_DEFINE = require('../internals/ie8-dom-define');\nvar anObject = require('../internals/an-object');\nvar toPrimitive = require('../internals/to-primitive');\n\n// eslint-disable-next-line es/no-object-defineproperty -- safe\nvar $defineProperty = Object.defineProperty;\n\n// `Object.defineProperty` method\n// https://tc39.es/ecma262/#sec-object.defineproperty\nexports.f = DESCRIPTORS ? $defineProperty : function defineProperty(O, P, Attributes) {\n  anObject(O);\n  P = toPrimitive(P, true);\n  anObject(Attributes);\n  if (IE8_DOM_DEFINE) try {\n    return $defineProperty(O, P, Attributes);\n  } catch (error) { /* empty */ }\n  if ('get' in Attributes || 'set' in Attributes) throw TypeError('Accessors not supported');\n  if ('value' in Attributes) O[P] = Attributes.value;\n  return O;\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar definePropertyModule = require('../internals/object-define-property');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\n\nmodule.exports = DESCRIPTORS ? function (object, key, value) {\n  return definePropertyModule.f(object, key, createPropertyDescriptor(1, value));\n} : function (object, key, value) {\n  object[key] = value;\n  return object;\n};\n","var global = require('../internals/global');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nmodule.exports = function (key, value) {\n  try {\n    createNonEnumerableProperty(global, key, value);\n  } catch (error) {\n    global[key] = value;\n  } return value;\n};\n","var global = require('../internals/global');\nvar setGlobal = require('../internals/set-global');\n\nvar SHARED = '__core-js_shared__';\nvar store = global[SHARED] || setGlobal(SHARED, {});\n\nmodule.exports = store;\n","var store = require('../internals/shared-store');\n\nvar functionToString = Function.toString;\n\n// this helper broken in `3.4.1-3.4.4`, so we can't use `shared` helper\nif (typeof store.inspectSource != 'function') {\n  store.inspectSource = function (it) {\n    return functionToString.call(it);\n  };\n}\n\nmodule.exports = store.inspectSource;\n","var global = require('../internals/global');\nvar inspectSource = require('../internals/inspect-source');\n\nvar WeakMap = global.WeakMap;\n\nmodule.exports = typeof WeakMap === 'function' && /native code/.test(inspectSource(WeakMap));\n","var IS_PURE = require('../internals/is-pure');\nvar store = require('../internals/shared-store');\n\n(module.exports = function (key, value) {\n  return store[key] || (store[key] = value !== undefined ? value : {});\n})('versions', []).push({\n  version: '3.12.1',\n  mode: IS_PURE ? 'pure' : 'global',\n  copyright: '© 2021 Denis Pushkarev (zloirock.ru)'\n});\n","var id = 0;\nvar postfix = Math.random();\n\nmodule.exports = function (key) {\n  return 'Symbol(' + String(key === undefined ? '' : key) + ')_' + (++id + postfix).toString(36);\n};\n","var NATIVE_WEAK_MAP = require('../internals/native-weak-map');\nvar global = require('../internals/global');\nvar isObject = require('../internals/is-object');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar objectHas = require('../internals/has');\nvar shared = require('../internals/shared-store');\nvar sharedKey = require('../internals/shared-key');\nvar hiddenKeys = require('../internals/hidden-keys');\n\nvar OBJECT_ALREADY_INITIALIZED = 'Object already initialized';\nvar WeakMap = global.WeakMap;\nvar set, get, has;\n\nvar enforce = function (it) {\n  return has(it) ? get(it) : set(it, {});\n};\n\nvar getterFor = function (TYPE) {\n  return function (it) {\n    var state;\n    if (!isObject(it) || (state = get(it)).type !== TYPE) {\n      throw TypeError('Incompatible receiver, ' + TYPE + ' required');\n    } return state;\n  };\n};\n\nif (NATIVE_WEAK_MAP || shared.state) {\n  var store = shared.state || (shared.state = new WeakMap());\n  var wmget = store.get;\n  var wmhas = store.has;\n  var wmset = store.set;\n  set = function (it, metadata) {\n    if (wmhas.call(store, it)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);\n    metadata.facade = it;\n    wmset.call(store, it, metadata);\n    return metadata;\n  };\n  get = function (it) {\n    return wmget.call(store, it) || {};\n  };\n  has = function (it) {\n    return wmhas.call(store, it);\n  };\n} else {\n  var STATE = sharedKey('state');\n  hiddenKeys[STATE] = true;\n  set = function (it, metadata) {\n    if (objectHas(it, STATE)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);\n    metadata.facade = it;\n    createNonEnumerableProperty(it, STATE, metadata);\n    return metadata;\n  };\n  get = function (it) {\n    return objectHas(it, STATE) ? it[STATE] : {};\n  };\n  has = function (it) {\n    return objectHas(it, STATE);\n  };\n}\n\nmodule.exports = {\n  set: set,\n  get: get,\n  has: has,\n  enforce: enforce,\n  getterFor: getterFor\n};\n","var shared = require('../internals/shared');\nvar uid = require('../internals/uid');\n\nvar keys = shared('keys');\n\nmodule.exports = function (key) {\n  return keys[key] || (keys[key] = uid(key));\n};\n","module.exports = {};\n","var global = require('../internals/global');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar has = require('../internals/has');\nvar setGlobal = require('../internals/set-global');\nvar inspectSource = require('../internals/inspect-source');\nvar InternalStateModule = require('../internals/internal-state');\n\nvar getInternalState = InternalStateModule.get;\nvar enforceInternalState = InternalStateModule.enforce;\nvar TEMPLATE = String(String).split('String');\n\n(module.exports = function (O, key, value, options) {\n  var unsafe = options ? !!options.unsafe : false;\n  var simple = options ? !!options.enumerable : false;\n  var noTargetGet = options ? !!options.noTargetGet : false;\n  var state;\n  if (typeof value == 'function') {\n    if (typeof key == 'string' && !has(value, 'name')) {\n      createNonEnumerableProperty(value, 'name', key);\n    }\n    state = enforceInternalState(value);\n    if (!state.source) {\n      state.source = TEMPLATE.join(typeof key == 'string' ? key : '');\n    }\n  }\n  if (O === global) {\n    if (simple) O[key] = value;\n    else setGlobal(key, value);\n    return;\n  } else if (!unsafe) {\n    delete O[key];\n  } else if (!noTargetGet && O[key]) {\n    simple = true;\n  }\n  if (simple) O[key] = value;\n  else createNonEnumerableProperty(O, key, value);\n// add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative\n})(Function.prototype, 'toString', function toString() {\n  return typeof this == 'function' && getInternalState(this).source || inspectSource(this);\n});\n","var global = require('../internals/global');\n\nmodule.exports = global;\n","var path = require('../internals/path');\nvar global = require('../internals/global');\n\nvar aFunction = function (variable) {\n  return typeof variable == 'function' ? variable : undefined;\n};\n\nmodule.exports = function (namespace, method) {\n  return arguments.length < 2 ? aFunction(path[namespace]) || aFunction(global[namespace])\n    : path[namespace] && path[namespace][method] || global[namespace] && global[namespace][method];\n};\n","var ceil = Math.ceil;\nvar floor = Math.floor;\n\n// `ToInteger` abstract operation\n// https://tc39.es/ecma262/#sec-tointeger\nmodule.exports = function (argument) {\n  return isNaN(argument = +argument) ? 0 : (argument > 0 ? floor : ceil)(argument);\n};\n","var toInteger = require('../internals/to-integer');\n\nvar min = Math.min;\n\n// `ToLength` abstract operation\n// https://tc39.es/ecma262/#sec-tolength\nmodule.exports = function (argument) {\n  return argument > 0 ? min(toInteger(argument), 0x1FFFFFFFFFFFFF) : 0; // 2 ** 53 - 1 == 9007199254740991\n};\n","var toInteger = require('../internals/to-integer');\n\nvar max = Math.max;\nvar min = Math.min;\n\n// Helper for a popular repeating case of the spec:\n// Let integer be ? ToInteger(index).\n// If integer < 0, let result be max((length + integer), 0); else let result be min(integer, length).\nmodule.exports = function (index, length) {\n  var integer = toInteger(index);\n  return integer < 0 ? max(integer + length, 0) : min(integer, length);\n};\n","var toIndexedObject = require('../internals/to-indexed-object');\nvar toLength = require('../internals/to-length');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\n\n// `Array.prototype.{ indexOf, includes }` methods implementation\nvar createMethod = function (IS_INCLUDES) {\n  return function ($this, el, fromIndex) {\n    var O = toIndexedObject($this);\n    var length = toLength(O.length);\n    var index = toAbsoluteIndex(fromIndex, length);\n    var value;\n    // Array#includes uses SameValueZero equality algorithm\n    // eslint-disable-next-line no-self-compare -- NaN check\n    if (IS_INCLUDES && el != el) while (length > index) {\n      value = O[index++];\n      // eslint-disable-next-line no-self-compare -- NaN check\n      if (value != value) return true;\n    // Array#indexOf ignores holes, Array#includes - not\n    } else for (;length > index; index++) {\n      if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;\n    } return !IS_INCLUDES && -1;\n  };\n};\n\nmodule.exports = {\n  // `Array.prototype.includes` method\n  // https://tc39.es/ecma262/#sec-array.prototype.includes\n  includes: createMethod(true),\n  // `Array.prototype.indexOf` method\n  // https://tc39.es/ecma262/#sec-array.prototype.indexof\n  indexOf: createMethod(false)\n};\n","var has = require('../internals/has');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar indexOf = require('../internals/array-includes').indexOf;\nvar hiddenKeys = require('../internals/hidden-keys');\n\nmodule.exports = function (object, names) {\n  var O = toIndexedObject(object);\n  var i = 0;\n  var result = [];\n  var key;\n  for (key in O) !has(hiddenKeys, key) && has(O, key) && result.push(key);\n  // Don't enum bug & hidden keys\n  while (names.length > i) if (has(O, key = names[i++])) {\n    ~indexOf(result, key) || result.push(key);\n  }\n  return result;\n};\n","// IE8- don't enum bug keys\nmodule.exports = [\n  'constructor',\n  'hasOwnProperty',\n  'isPrototypeOf',\n  'propertyIsEnumerable',\n  'toLocaleString',\n  'toString',\n  'valueOf'\n];\n","var internalObjectKeys = require('../internals/object-keys-internal');\nvar enumBugKeys = require('../internals/enum-bug-keys');\n\nvar hiddenKeys = enumBugKeys.concat('length', 'prototype');\n\n// `Object.getOwnPropertyNames` method\n// https://tc39.es/ecma262/#sec-object.getownpropertynames\n// eslint-disable-next-line es/no-object-getownpropertynames -- safe\nexports.f = Object.getOwnPropertyNames || function getOwnPropertyNames(O) {\n  return internalObjectKeys(O, hiddenKeys);\n};\n","// eslint-disable-next-line es/no-object-getownpropertysymbols -- safe\nexports.f = Object.getOwnPropertySymbols;\n","var getBuiltIn = require('../internals/get-built-in');\nvar getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar anObject = require('../internals/an-object');\n\n// all object keys, includes non-enumerable and symbols\nmodule.exports = getBuiltIn('Reflect', 'ownKeys') || function ownKeys(it) {\n  var keys = getOwnPropertyNamesModule.f(anObject(it));\n  var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;\n  return getOwnPropertySymbols ? keys.concat(getOwnPropertySymbols(it)) : keys;\n};\n","var has = require('../internals/has');\nvar ownKeys = require('../internals/own-keys');\nvar getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');\nvar definePropertyModule = require('../internals/object-define-property');\n\nmodule.exports = function (target, source) {\n  var keys = ownKeys(source);\n  var defineProperty = definePropertyModule.f;\n  var getOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;\n  for (var i = 0; i < keys.length; i++) {\n    var key = keys[i];\n    if (!has(target, key)) defineProperty(target, key, getOwnPropertyDescriptor(source, key));\n  }\n};\n","var fails = require('../internals/fails');\n\nvar replacement = /#|\\.prototype\\./;\n\nvar isForced = function (feature, detection) {\n  var value = data[normalize(feature)];\n  return value == POLYFILL ? true\n    : value == NATIVE ? false\n    : typeof detection == 'function' ? fails(detection)\n    : !!detection;\n};\n\nvar normalize = isForced.normalize = function (string) {\n  return String(string).replace(replacement, '.').toLowerCase();\n};\n\nvar data = isForced.data = {};\nvar NATIVE = isForced.NATIVE = 'N';\nvar POLYFILL = isForced.POLYFILL = 'P';\n\nmodule.exports = isForced;\n","var global = require('../internals/global');\nvar getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar setGlobal = require('../internals/set-global');\nvar copyConstructorProperties = require('../internals/copy-constructor-properties');\nvar isForced = require('../internals/is-forced');\n\n/*\n  options.target      - name of the target object\n  options.global      - target is the global object\n  options.stat        - export as static methods of target\n  options.proto       - export as prototype methods of target\n  options.real        - real prototype method for the `pure` version\n  options.forced      - export even if the native feature is available\n  options.bind        - bind methods to the target, required for the `pure` version\n  options.wrap        - wrap constructors to preventing global pollution, required for the `pure` version\n  options.unsafe      - use the simple assignment of property instead of delete + defineProperty\n  options.sham        - add a flag to not completely full polyfills\n  options.enumerable  - export as enumerable property\n  options.noTargetGet - prevent calling a getter on target\n*/\nmodule.exports = function (options, source) {\n  var TARGET = options.target;\n  var GLOBAL = options.global;\n  var STATIC = options.stat;\n  var FORCED, target, key, targetProperty, sourceProperty, descriptor;\n  if (GLOBAL) {\n    target = global;\n  } else if (STATIC) {\n    target = global[TARGET] || setGlobal(TARGET, {});\n  } else {\n    target = (global[TARGET] || {}).prototype;\n  }\n  if (target) for (key in source) {\n    sourceProperty = source[key];\n    if (options.noTargetGet) {\n      descriptor = getOwnPropertyDescriptor(target, key);\n      targetProperty = descriptor && descriptor.value;\n    } else targetProperty = target[key];\n    FORCED = isForced(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced);\n    // contained in target\n    if (!FORCED && targetProperty !== undefined) {\n      if (typeof sourceProperty === typeof targetProperty) continue;\n      copyConstructorProperties(sourceProperty, targetProperty);\n    }\n    // add a flag to not completely full polyfills\n    if (options.sham || (targetProperty && targetProperty.sham)) {\n      createNonEnumerableProperty(sourceProperty, 'sham', true);\n    }\n    // extend global\n    redefine(target, key, sourceProperty, options);\n  }\n};\n","var internalObjectKeys = require('../internals/object-keys-internal');\nvar enumBugKeys = require('../internals/enum-bug-keys');\n\n// `Object.keys` method\n// https://tc39.es/ecma262/#sec-object.keys\n// eslint-disable-next-line es/no-object-keys -- safe\nmodule.exports = Object.keys || function keys(O) {\n  return internalObjectKeys(O, enumBugKeys);\n};\n","'use strict';\nvar DESCRIPTORS = require('../internals/descriptors');\nvar fails = require('../internals/fails');\nvar objectKeys = require('../internals/object-keys');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar toObject = require('../internals/to-object');\nvar IndexedObject = require('../internals/indexed-object');\n\n// eslint-disable-next-line es/no-object-assign -- safe\nvar $assign = Object.assign;\n// eslint-disable-next-line es/no-object-defineproperty -- required for testing\nvar defineProperty = Object.defineProperty;\n\n// `Object.assign` method\n// https://tc39.es/ecma262/#sec-object.assign\nmodule.exports = !$assign || fails(function () {\n  // should have correct order of operations (Edge bug)\n  if (DESCRIPTORS && $assign({ b: 1 }, $assign(defineProperty({}, 'a', {\n    enumerable: true,\n    get: function () {\n      defineProperty(this, 'b', {\n        value: 3,\n        enumerable: false\n      });\n    }\n  }), { b: 2 })).b !== 1) return true;\n  // should work with symbols and should have deterministic property order (V8 bug)\n  var A = {};\n  var B = {};\n  // eslint-disable-next-line es/no-symbol -- safe\n  var symbol = Symbol();\n  var alphabet = 'abcdefghijklmnopqrst';\n  A[symbol] = 7;\n  alphabet.split('').forEach(function (chr) { B[chr] = chr; });\n  return $assign({}, A)[symbol] != 7 || objectKeys($assign({}, B)).join('') != alphabet;\n}) ? function assign(target, source) { // eslint-disable-line no-unused-vars -- required for `.length`\n  var T = toObject(target);\n  var argumentsLength = arguments.length;\n  var index = 1;\n  var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;\n  var propertyIsEnumerable = propertyIsEnumerableModule.f;\n  while (argumentsLength > index) {\n    var S = IndexedObject(arguments[index++]);\n    var keys = getOwnPropertySymbols ? objectKeys(S).concat(getOwnPropertySymbols(S)) : objectKeys(S);\n    var length = keys.length;\n    var j = 0;\n    var key;\n    while (length > j) {\n      key = keys[j++];\n      if (!DESCRIPTORS || propertyIsEnumerable.call(S, key)) T[key] = S[key];\n    }\n  } return T;\n} : $assign;\n","var $ = require('../internals/export');\nvar assign = require('../internals/object-assign');\n\n// `Object.assign` method\n// https://tc39.es/ecma262/#sec-object.assign\n// eslint-disable-next-line es/no-object-assign -- required for testing\n$({ target: 'Object', stat: true, forced: Object.assign !== assign }, {\n  assign: assign\n});\n","var global = require('../internals/global');\nvar userAgent = require('../internals/engine-user-agent');\n\nvar process = global.process;\nvar versions = process && process.versions;\nvar v8 = versions && versions.v8;\nvar match, version;\n\nif (v8) {\n  match = v8.split('.');\n  version = match[0] < 4 ? 1 : match[0] + match[1];\n} else if (userAgent) {\n  match = userAgent.match(/Edge\\/(\\d+)/);\n  if (!match || match[1] >= 74) {\n    match = userAgent.match(/Chrome\\/(\\d+)/);\n    if (match) version = match[1];\n  }\n}\n\nmodule.exports = version && +version;\n","module.exports = function (it) {\n  if (typeof it != 'function') {\n    throw TypeError(String(it) + ' is not a function');\n  } return it;\n};\n","var aFunction = require('../internals/a-function');\n\n// optional / simple context binding\nmodule.exports = function (fn, that, length) {\n  aFunction(fn);\n  if (that === undefined) return fn;\n  switch (length) {\n    case 0: return function () {\n      return fn.call(that);\n    };\n    case 1: return function (a) {\n      return fn.call(that, a);\n    };\n    case 2: return function (a, b) {\n      return fn.call(that, a, b);\n    };\n    case 3: return function (a, b, c) {\n      return fn.call(that, a, b, c);\n    };\n  }\n  return function (/* ...args */) {\n    return fn.apply(that, arguments);\n  };\n};\n","var classof = require('../internals/classof-raw');\n\n// `IsArray` abstract operation\n// https://tc39.es/ecma262/#sec-isarray\n// eslint-disable-next-line es/no-array-isarray -- safe\nmodule.exports = Array.isArray || function isArray(arg) {\n  return classof(arg) == 'Array';\n};\n","var getBuiltIn = require('../internals/get-built-in');\n\nmodule.exports = getBuiltIn('navigator', 'userAgent') || '';\n","/* eslint-disable es/no-symbol -- required for testing */\nvar V8_VERSION = require('../internals/engine-v8-version');\nvar fails = require('../internals/fails');\n\n// eslint-disable-next-line es/no-object-getownpropertysymbols -- required for testing\nmodule.exports = !!Object.getOwnPropertySymbols && !fails(function () {\n  return !String(Symbol()) ||\n    // Chrome 38 Symbol has incorrect toString conversion\n    // Chrome 38-40 symbols are not inherited from DOM collections prototypes to instances\n    !Symbol.sham && V8_VERSION && V8_VERSION < 41;\n});\n","/* eslint-disable es/no-symbol -- required for testing */\nvar NATIVE_SYMBOL = require('../internals/native-symbol');\n\nmodule.exports = NATIVE_SYMBOL\n  && !Symbol.sham\n  && typeof Symbol.iterator == 'symbol';\n","var global = require('../internals/global');\nvar shared = require('../internals/shared');\nvar has = require('../internals/has');\nvar uid = require('../internals/uid');\nvar NATIVE_SYMBOL = require('../internals/native-symbol');\nvar USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');\n\nvar WellKnownSymbolsStore = shared('wks');\nvar Symbol = global.Symbol;\nvar createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter || uid;\n\nmodule.exports = function (name) {\n  if (!has(WellKnownSymbolsStore, name) || !(NATIVE_SYMBOL || typeof WellKnownSymbolsStore[name] == 'string')) {\n    if (NATIVE_SYMBOL && has(Symbol, name)) {\n      WellKnownSymbolsStore[name] = Symbol[name];\n    } else {\n      WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);\n    }\n  } return WellKnownSymbolsStore[name];\n};\n","var isObject = require('../internals/is-object');\nvar isArray = require('../internals/is-array');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar SPECIES = wellKnownSymbol('species');\n\n// `ArraySpeciesCreate` abstract operation\n// https://tc39.es/ecma262/#sec-arrayspeciescreate\nmodule.exports = function (originalArray, length) {\n  var C;\n  if (isArray(originalArray)) {\n    C = originalArray.constructor;\n    // cross-realm fallback\n    if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;\n    else if (isObject(C)) {\n      C = C[SPECIES];\n      if (C === null) C = undefined;\n    }\n  } return new (C === undefined ? Array : C)(length === 0 ? 0 : length);\n};\n","var bind = require('../internals/function-bind-context');\nvar IndexedObject = require('../internals/indexed-object');\nvar toObject = require('../internals/to-object');\nvar toLength = require('../internals/to-length');\nvar arraySpeciesCreate = require('../internals/array-species-create');\n\nvar push = [].push;\n\n// `Array.prototype.{ forEach, map, filter, some, every, find, findIndex, filterOut }` methods implementation\nvar createMethod = function (TYPE) {\n  var IS_MAP = TYPE == 1;\n  var IS_FILTER = TYPE == 2;\n  var IS_SOME = TYPE == 3;\n  var IS_EVERY = TYPE == 4;\n  var IS_FIND_INDEX = TYPE == 6;\n  var IS_FILTER_OUT = TYPE == 7;\n  var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;\n  return function ($this, callbackfn, that, specificCreate) {\n    var O = toObject($this);\n    var self = IndexedObject(O);\n    var boundFunction = bind(callbackfn, that, 3);\n    var length = toLength(self.length);\n    var index = 0;\n    var create = specificCreate || arraySpeciesCreate;\n    var target = IS_MAP ? create($this, length) : IS_FILTER || IS_FILTER_OUT ? create($this, 0) : undefined;\n    var value, result;\n    for (;length > index; index++) if (NO_HOLES || index in self) {\n      value = self[index];\n      result = boundFunction(value, index, O);\n      if (TYPE) {\n        if (IS_MAP) target[index] = result; // map\n        else if (result) switch (TYPE) {\n          case 3: return true;              // some\n          case 5: return value;             // find\n          case 6: return index;             // findIndex\n          case 2: push.call(target, value); // filter\n        } else switch (TYPE) {\n          case 4: return false;             // every\n          case 7: push.call(target, value); // filterOut\n        }\n      }\n    }\n    return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;\n  };\n};\n\nmodule.exports = {\n  // `Array.prototype.forEach` method\n  // https://tc39.es/ecma262/#sec-array.prototype.foreach\n  forEach: createMethod(0),\n  // `Array.prototype.map` method\n  // https://tc39.es/ecma262/#sec-array.prototype.map\n  map: createMethod(1),\n  // `Array.prototype.filter` method\n  // https://tc39.es/ecma262/#sec-array.prototype.filter\n  filter: createMethod(2),\n  // `Array.prototype.some` method\n  // https://tc39.es/ecma262/#sec-array.prototype.some\n  some: createMethod(3),\n  // `Array.prototype.every` method\n  // https://tc39.es/ecma262/#sec-array.prototype.every\n  every: createMethod(4),\n  // `Array.prototype.find` method\n  // https://tc39.es/ecma262/#sec-array.prototype.find\n  find: createMethod(5),\n  // `Array.prototype.findIndex` method\n  // https://tc39.es/ecma262/#sec-array.prototype.findIndex\n  findIndex: createMethod(6),\n  // `Array.prototype.filterOut` method\n  // https://github.com/tc39/proposal-array-filtering\n  filterOut: createMethod(7)\n};\n","var fails = require('../internals/fails');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar V8_VERSION = require('../internals/engine-v8-version');\n\nvar SPECIES = wellKnownSymbol('species');\n\nmodule.exports = function (METHOD_NAME) {\n  // We can't use this feature detection in V8 since it causes\n  // deoptimization and serious performance degradation\n  // https://github.com/zloirock/core-js/issues/677\n  return V8_VERSION >= 51 || !fails(function () {\n    var array = [];\n    var constructor = array.constructor = {};\n    constructor[SPECIES] = function () {\n      return { foo: 1 };\n    };\n    return array[METHOD_NAME](Boolean).foo !== 1;\n  });\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar $map = require('../internals/array-iteration').map;\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('map');\n\n// `Array.prototype.map` method\n// https://tc39.es/ecma262/#sec-array.prototype.map\n// with adding support of @@species\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {\n  map: function map(callbackfn /* , thisArg */) {\n    return $map(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n  }\n});\n","'use strict';\nvar toPrimitive = require('../internals/to-primitive');\nvar definePropertyModule = require('../internals/object-define-property');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\n\nmodule.exports = function (object, key, value) {\n  var propertyKey = toPrimitive(key);\n  if (propertyKey in object) definePropertyModule.f(object, propertyKey, createPropertyDescriptor(0, value));\n  else object[propertyKey] = value;\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar fails = require('../internals/fails');\nvar isArray = require('../internals/is-array');\nvar isObject = require('../internals/is-object');\nvar toObject = require('../internals/to-object');\nvar toLength = require('../internals/to-length');\nvar createProperty = require('../internals/create-property');\nvar arraySpeciesCreate = require('../internals/array-species-create');\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar V8_VERSION = require('../internals/engine-v8-version');\n\nvar IS_CONCAT_SPREADABLE = wellKnownSymbol('isConcatSpreadable');\nvar MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;\nvar MAXIMUM_ALLOWED_INDEX_EXCEEDED = 'Maximum allowed index exceeded';\n\n// We can't use this feature detection in V8 since it causes\n// deoptimization and serious performance degradation\n// https://github.com/zloirock/core-js/issues/679\nvar IS_CONCAT_SPREADABLE_SUPPORT = V8_VERSION >= 51 || !fails(function () {\n  var array = [];\n  array[IS_CONCAT_SPREADABLE] = false;\n  return array.concat()[0] !== array;\n});\n\nvar SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('concat');\n\nvar isConcatSpreadable = function (O) {\n  if (!isObject(O)) return false;\n  var spreadable = O[IS_CONCAT_SPREADABLE];\n  return spreadable !== undefined ? !!spreadable : isArray(O);\n};\n\nvar FORCED = !IS_CONCAT_SPREADABLE_SUPPORT || !SPECIES_SUPPORT;\n\n// `Array.prototype.concat` method\n// https://tc39.es/ecma262/#sec-array.prototype.concat\n// with adding support of @@isConcatSpreadable and @@species\n$({ target: 'Array', proto: true, forced: FORCED }, {\n  // eslint-disable-next-line no-unused-vars -- required for `.length`\n  concat: function concat(arg) {\n    var O = toObject(this);\n    var A = arraySpeciesCreate(O, 0);\n    var n = 0;\n    var i, k, length, len, E;\n    for (i = -1, length = arguments.length; i < length; i++) {\n      E = i === -1 ? O : arguments[i];\n      if (isConcatSpreadable(E)) {\n        len = toLength(E.length);\n        if (n + len > MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);\n        for (k = 0; k < len; k++, n++) if (k in E) createProperty(A, n, E[k]);\n      } else {\n        if (n >= MAX_SAFE_INTEGER) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);\n        createProperty(A, n++, E);\n      }\n    }\n    A.length = n;\n    return A;\n  }\n});\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\nvar test = {};\n\ntest[TO_STRING_TAG] = 'z';\n\nmodule.exports = String(test) === '[object z]';\n","var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar classofRaw = require('../internals/classof-raw');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\n// ES3 wrong here\nvar CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) == 'Arguments';\n\n// fallback for IE11 Script Access Denied error\nvar tryGet = function (it, key) {\n  try {\n    return it[key];\n  } catch (error) { /* empty */ }\n};\n\n// getting tag from ES6+ `Object.prototype.toString`\nmodule.exports = TO_STRING_TAG_SUPPORT ? classofRaw : function (it) {\n  var O, tag, result;\n  return it === undefined ? 'Undefined' : it === null ? 'Null'\n    // @@toStringTag case\n    : typeof (tag = tryGet(O = Object(it), TO_STRING_TAG)) == 'string' ? tag\n    // builtinTag case\n    : CORRECT_ARGUMENTS ? classofRaw(O)\n    // ES3 arguments fallback\n    : (result = classofRaw(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : result;\n};\n","'use strict';\nvar TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar classof = require('../internals/classof');\n\n// `Object.prototype.toString` method implementation\n// https://tc39.es/ecma262/#sec-object.prototype.tostring\nmodule.exports = TO_STRING_TAG_SUPPORT ? {}.toString : function toString() {\n  return '[object ' + classof(this) + ']';\n};\n","var TO_STRING_TAG_SUPPORT = require('../internals/to-string-tag-support');\nvar redefine = require('../internals/redefine');\nvar toString = require('../internals/object-to-string');\n\n// `Object.prototype.toString` method\n// https://tc39.es/ecma262/#sec-object.prototype.tostring\nif (!TO_STRING_TAG_SUPPORT) {\n  redefine(Object.prototype, 'toString', toString, { unsafe: true });\n}\n","var global = require('../internals/global');\n\nmodule.exports = global.Promise;\n","var redefine = require('../internals/redefine');\n\nmodule.exports = function (target, src, options) {\n  for (var key in src) redefine(target, key, src[key], options);\n  return target;\n};\n","var isObject = require('../internals/is-object');\n\nmodule.exports = function (it) {\n  if (!isObject(it) && it !== null) {\n    throw TypeError(\"Can't set \" + String(it) + ' as a prototype');\n  } return it;\n};\n","/* eslint-disable no-proto -- safe */\nvar anObject = require('../internals/an-object');\nvar aPossiblePrototype = require('../internals/a-possible-prototype');\n\n// `Object.setPrototypeOf` method\n// https://tc39.es/ecma262/#sec-object.setprototypeof\n// Works with __proto__ only. Old v8 can't work with null proto objects.\n// eslint-disable-next-line es/no-object-setprototypeof -- safe\nmodule.exports = Object.setPrototypeOf || ('__proto__' in {} ? function () {\n  var CORRECT_SETTER = false;\n  var test = {};\n  var setter;\n  try {\n    // eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe\n    setter = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').set;\n    setter.call(test, []);\n    CORRECT_SETTER = test instanceof Array;\n  } catch (error) { /* empty */ }\n  return function setPrototypeOf(O, proto) {\n    anObject(O);\n    aPossiblePrototype(proto);\n    if (CORRECT_SETTER) setter.call(O, proto);\n    else O.__proto__ = proto;\n    return O;\n  };\n}() : undefined);\n","var defineProperty = require('../internals/object-define-property').f;\nvar has = require('../internals/has');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar TO_STRING_TAG = wellKnownSymbol('toStringTag');\n\nmodule.exports = function (it, TAG, STATIC) {\n  if (it && !has(it = STATIC ? it : it.prototype, TO_STRING_TAG)) {\n    defineProperty(it, TO_STRING_TAG, { configurable: true, value: TAG });\n  }\n};\n","'use strict';\nvar getBuiltIn = require('../internals/get-built-in');\nvar definePropertyModule = require('../internals/object-define-property');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar DESCRIPTORS = require('../internals/descriptors');\n\nvar SPECIES = wellKnownSymbol('species');\n\nmodule.exports = function (CONSTRUCTOR_NAME) {\n  var Constructor = getBuiltIn(CONSTRUCTOR_NAME);\n  var defineProperty = definePropertyModule.f;\n\n  if (DESCRIPTORS && Constructor && !Constructor[SPECIES]) {\n    defineProperty(Constructor, SPECIES, {\n      configurable: true,\n      get: function () { return this; }\n    });\n  }\n};\n","module.exports = {};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\nvar Iterators = require('../internals/iterators');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar ArrayPrototype = Array.prototype;\n\n// check on default Array iterator\nmodule.exports = function (it) {\n  return it !== undefined && (Iterators.Array === it || ArrayPrototype[ITERATOR] === it);\n};\n","var classof = require('../internals/classof');\nvar Iterators = require('../internals/iterators');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar ITERATOR = wellKnownSymbol('iterator');\n\nmodule.exports = function (it) {\n  if (it != undefined) return it[ITERATOR]\n    || it['@@iterator']\n    || Iterators[classof(it)];\n};\n","var anObject = require('../internals/an-object');\n\nmodule.exports = function (iterator) {\n  var returnMethod = iterator['return'];\n  if (returnMethod !== undefined) {\n    return anObject(returnMethod.call(iterator)).value;\n  }\n};\n","var anObject = require('../internals/an-object');\nvar isArrayIteratorMethod = require('../internals/is-array-iterator-method');\nvar toLength = require('../internals/to-length');\nvar bind = require('../internals/function-bind-context');\nvar getIteratorMethod = require('../internals/get-iterator-method');\nvar iteratorClose = require('../internals/iterator-close');\n\nvar Result = function (stopped, result) {\n  this.stopped = stopped;\n  this.result = result;\n};\n\nmodule.exports = function (iterable, unboundFunction, options) {\n  var that = options && options.that;\n  var AS_ENTRIES = !!(options && options.AS_ENTRIES);\n  var IS_ITERATOR = !!(options && options.IS_ITERATOR);\n  var INTERRUPTED = !!(options && options.INTERRUPTED);\n  var fn = bind(unboundFunction, that, 1 + AS_ENTRIES + INTERRUPTED);\n  var iterator, iterFn, index, length, result, next, step;\n\n  var stop = function (condition) {\n    if (iterator) iteratorClose(iterator);\n    return new Result(true, condition);\n  };\n\n  var callFn = function (value) {\n    if (AS_ENTRIES) {\n      anObject(value);\n      return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);\n    } return INTERRUPTED ? fn(value, stop) : fn(value);\n  };\n\n  if (IS_ITERATOR) {\n    iterator = iterable;\n  } else {\n    iterFn = getIteratorMethod(iterable);\n    if (typeof iterFn != 'function') throw TypeError('Target is not iterable');\n    // optimisation for array iterators\n    if (isArrayIteratorMethod(iterFn)) {\n      for (index = 0, length = toLength(iterable.length); length > index; index++) {\n        result = callFn(iterable[index]);\n        if (result && result instanceof Result) return result;\n      } return new Result(false);\n    }\n    iterator = iterFn.call(iterable);\n  }\n\n  next = iterator.next;\n  while (!(step = next.call(iterator)).done) {\n    try {\n      result = callFn(step.value);\n    } catch (error) {\n      iteratorClose(iterator);\n      throw error;\n    }\n    if (typeof result == 'object' && result && result instanceof Result) return result;\n  } return new Result(false);\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar SAFE_CLOSING = false;\n\ntry {\n  var called = 0;\n  var iteratorWithReturn = {\n    next: function () {\n      return { done: !!called++ };\n    },\n    'return': function () {\n      SAFE_CLOSING = true;\n    }\n  };\n  iteratorWithReturn[ITERATOR] = function () {\n    return this;\n  };\n  // eslint-disable-next-line es/no-array-from, no-throw-literal -- required for testing\n  Array.from(iteratorWithReturn, function () { throw 2; });\n} catch (error) { /* empty */ }\n\nmodule.exports = function (exec, SKIP_CLOSING) {\n  if (!SKIP_CLOSING && !SAFE_CLOSING) return false;\n  var ITERATION_SUPPORT = false;\n  try {\n    var object = {};\n    object[ITERATOR] = function () {\n      return {\n        next: function () {\n          return { done: ITERATION_SUPPORT = true };\n        }\n      };\n    };\n    exec(object);\n  } catch (error) { /* empty */ }\n  return ITERATION_SUPPORT;\n};\n","var global = require('../internals/global');\nvar fails = require('../internals/fails');\nvar bind = require('../internals/function-bind-context');\nvar html = require('../internals/html');\nvar createElement = require('../internals/document-create-element');\nvar IS_IOS = require('../internals/engine-is-ios');\nvar IS_NODE = require('../internals/engine-is-node');\n\nvar location = global.location;\nvar set = global.setImmediate;\nvar clear = global.clearImmediate;\nvar process = global.process;\nvar MessageChannel = global.MessageChannel;\nvar Dispatch = global.Dispatch;\nvar counter = 0;\nvar queue = {};\nvar ONREADYSTATECHANGE = 'onreadystatechange';\nvar defer, channel, port;\n\nvar run = function (id) {\n  // eslint-disable-next-line no-prototype-builtins -- safe\n  if (queue.hasOwnProperty(id)) {\n    var fn = queue[id];\n    delete queue[id];\n    fn();\n  }\n};\n\nvar runner = function (id) {\n  return function () {\n    run(id);\n  };\n};\n\nvar listener = function (event) {\n  run(event.data);\n};\n\nvar post = function (id) {\n  // old engines have not location.origin\n  global.postMessage(id + '', location.protocol + '//' + location.host);\n};\n\n// Node.js 0.9+ & IE10+ has setImmediate, otherwise:\nif (!set || !clear) {\n  set = function setImmediate(fn) {\n    var args = [];\n    var i = 1;\n    while (arguments.length > i) args.push(arguments[i++]);\n    queue[++counter] = function () {\n      // eslint-disable-next-line no-new-func -- spec requirement\n      (typeof fn == 'function' ? fn : Function(fn)).apply(undefined, args);\n    };\n    defer(counter);\n    return counter;\n  };\n  clear = function clearImmediate(id) {\n    delete queue[id];\n  };\n  // Node.js 0.8-\n  if (IS_NODE) {\n    defer = function (id) {\n      process.nextTick(runner(id));\n    };\n  // Sphere (JS game engine) Dispatch API\n  } else if (Dispatch && Dispatch.now) {\n    defer = function (id) {\n      Dispatch.now(runner(id));\n    };\n  // Browsers with MessageChannel, includes WebWorkers\n  // except iOS - https://github.com/zloirock/core-js/issues/624\n  } else if (MessageChannel && !IS_IOS) {\n    channel = new MessageChannel();\n    port = channel.port2;\n    channel.port1.onmessage = listener;\n    defer = bind(port.postMessage, port, 1);\n  // Browsers with postMessage, skip WebWorkers\n  // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'\n  } else if (\n    global.addEventListener &&\n    typeof postMessage == 'function' &&\n    !global.importScripts &&\n    location && location.protocol !== 'file:' &&\n    !fails(post)\n  ) {\n    defer = post;\n    global.addEventListener('message', listener, false);\n  // IE8-\n  } else if (ONREADYSTATECHANGE in createElement('script')) {\n    defer = function (id) {\n      html.appendChild(createElement('script'))[ONREADYSTATECHANGE] = function () {\n        html.removeChild(this);\n        run(id);\n      };\n    };\n  // Rest old browsers\n  } else {\n    defer = function (id) {\n      setTimeout(runner(id), 0);\n    };\n  }\n}\n\nmodule.exports = {\n  set: set,\n  clear: clear\n};\n","var anObject = require('../internals/an-object');\nvar aFunction = require('../internals/a-function');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar SPECIES = wellKnownSymbol('species');\n\n// `SpeciesConstructor` abstract operation\n// https://tc39.es/ecma262/#sec-speciesconstructor\nmodule.exports = function (O, defaultConstructor) {\n  var C = anObject(O).constructor;\n  var S;\n  return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? defaultConstructor : aFunction(S);\n};\n","var getBuiltIn = require('../internals/get-built-in');\n\nmodule.exports = getBuiltIn('document', 'documentElement');\n","var userAgent = require('../internals/engine-user-agent');\n\nmodule.exports = /(?:iphone|ipod|ipad).*applewebkit/i.test(userAgent);\n","var classof = require('../internals/classof-raw');\nvar global = require('../internals/global');\n\nmodule.exports = classof(global.process) == 'process';\n","var global = require('../internals/global');\nvar getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;\nvar macrotask = require('../internals/task').set;\nvar IS_IOS = require('../internals/engine-is-ios');\nvar IS_WEBOS_WEBKIT = require('../internals/engine-is-webos-webkit');\nvar IS_NODE = require('../internals/engine-is-node');\n\nvar MutationObserver = global.MutationObserver || global.WebKitMutationObserver;\nvar document = global.document;\nvar process = global.process;\nvar Promise = global.Promise;\n// Node.js 11 shows ExperimentalWarning on getting `queueMicrotask`\nvar queueMicrotaskDescriptor = getOwnPropertyDescriptor(global, 'queueMicrotask');\nvar queueMicrotask = queueMicrotaskDescriptor && queueMicrotaskDescriptor.value;\n\nvar flush, head, last, notify, toggle, node, promise, then;\n\n// modern engines have queueMicrotask method\nif (!queueMicrotask) {\n  flush = function () {\n    var parent, fn;\n    if (IS_NODE && (parent = process.domain)) parent.exit();\n    while (head) {\n      fn = head.fn;\n      head = head.next;\n      try {\n        fn();\n      } catch (error) {\n        if (head) notify();\n        else last = undefined;\n        throw error;\n      }\n    } last = undefined;\n    if (parent) parent.enter();\n  };\n\n  // browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339\n  // also except WebOS Webkit https://github.com/zloirock/core-js/issues/898\n  if (!IS_IOS && !IS_NODE && !IS_WEBOS_WEBKIT && MutationObserver && document) {\n    toggle = true;\n    node = document.createTextNode('');\n    new MutationObserver(flush).observe(node, { characterData: true });\n    notify = function () {\n      node.data = toggle = !toggle;\n    };\n  // environments with maybe non-completely correct, but existent Promise\n  } else if (Promise && Promise.resolve) {\n    // Promise.resolve without an argument throws an error in LG WebOS 2\n    promise = Promise.resolve(undefined);\n    // workaround of WebKit ~ iOS Safari 10.1 bug\n    promise.constructor = Promise;\n    then = promise.then;\n    notify = function () {\n      then.call(promise, flush);\n    };\n  // Node.js without promises\n  } else if (IS_NODE) {\n    notify = function () {\n      process.nextTick(flush);\n    };\n  // for other environments - macrotask based on:\n  // - setImmediate\n  // - MessageChannel\n  // - window.postMessag\n  // - onreadystatechange\n  // - setTimeout\n  } else {\n    notify = function () {\n      // strange IE + webpack dev server bug - use .call(global)\n      macrotask.call(global, flush);\n    };\n  }\n}\n\nmodule.exports = queueMicrotask || function (fn) {\n  var task = { fn: fn, next: undefined };\n  if (last) last.next = task;\n  if (!head) {\n    head = task;\n    notify();\n  } last = task;\n};\n","var userAgent = require('../internals/engine-user-agent');\n\nmodule.exports = /web0s(?!.*chrome)/i.test(userAgent);\n","'use strict';\nvar aFunction = require('../internals/a-function');\n\nvar PromiseCapability = function (C) {\n  var resolve, reject;\n  this.promise = new C(function ($$resolve, $$reject) {\n    if (resolve !== undefined || reject !== undefined) throw TypeError('Bad Promise constructor');\n    resolve = $$resolve;\n    reject = $$reject;\n  });\n  this.resolve = aFunction(resolve);\n  this.reject = aFunction(reject);\n};\n\n// 25.4.1.5 NewPromiseCapability(C)\nmodule.exports.f = function (C) {\n  return new PromiseCapability(C);\n};\n","var anObject = require('../internals/an-object');\nvar isObject = require('../internals/is-object');\nvar newPromiseCapability = require('../internals/new-promise-capability');\n\nmodule.exports = function (C, x) {\n  anObject(C);\n  if (isObject(x) && x.constructor === C) return x;\n  var promiseCapability = newPromiseCapability.f(C);\n  var resolve = promiseCapability.resolve;\n  resolve(x);\n  return promiseCapability.promise;\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar IS_PURE = require('../internals/is-pure');\nvar global = require('../internals/global');\nvar getBuiltIn = require('../internals/get-built-in');\nvar NativePromise = require('../internals/native-promise-constructor');\nvar redefine = require('../internals/redefine');\nvar redefineAll = require('../internals/redefine-all');\nvar setPrototypeOf = require('../internals/object-set-prototype-of');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar setSpecies = require('../internals/set-species');\nvar isObject = require('../internals/is-object');\nvar aFunction = require('../internals/a-function');\nvar anInstance = require('../internals/an-instance');\nvar inspectSource = require('../internals/inspect-source');\nvar iterate = require('../internals/iterate');\nvar checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');\nvar speciesConstructor = require('../internals/species-constructor');\nvar task = require('../internals/task').set;\nvar microtask = require('../internals/microtask');\nvar promiseResolve = require('../internals/promise-resolve');\nvar hostReportErrors = require('../internals/host-report-errors');\nvar newPromiseCapabilityModule = require('../internals/new-promise-capability');\nvar perform = require('../internals/perform');\nvar InternalStateModule = require('../internals/internal-state');\nvar isForced = require('../internals/is-forced');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_BROWSER = require('../internals/engine-is-browser');\nvar IS_NODE = require('../internals/engine-is-node');\nvar V8_VERSION = require('../internals/engine-v8-version');\n\nvar SPECIES = wellKnownSymbol('species');\nvar PROMISE = 'Promise';\nvar getInternalState = InternalStateModule.get;\nvar setInternalState = InternalStateModule.set;\nvar getInternalPromiseState = InternalStateModule.getterFor(PROMISE);\nvar NativePromisePrototype = NativePromise && NativePromise.prototype;\nvar PromiseConstructor = NativePromise;\nvar PromiseConstructorPrototype = NativePromisePrototype;\nvar TypeError = global.TypeError;\nvar document = global.document;\nvar process = global.process;\nvar newPromiseCapability = newPromiseCapabilityModule.f;\nvar newGenericPromiseCapability = newPromiseCapability;\nvar DISPATCH_EVENT = !!(document && document.createEvent && global.dispatchEvent);\nvar NATIVE_REJECTION_EVENT = typeof PromiseRejectionEvent == 'function';\nvar UNHANDLED_REJECTION = 'unhandledrejection';\nvar REJECTION_HANDLED = 'rejectionhandled';\nvar PENDING = 0;\nvar FULFILLED = 1;\nvar REJECTED = 2;\nvar HANDLED = 1;\nvar UNHANDLED = 2;\nvar SUBCLASSING = false;\nvar Internal, OwnPromiseCapability, PromiseWrapper, nativeThen;\n\nvar FORCED = isForced(PROMISE, function () {\n  var GLOBAL_CORE_JS_PROMISE = inspectSource(PromiseConstructor) !== String(PromiseConstructor);\n  // V8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=830565\n  // We can't detect it synchronously, so just check versions\n  if (!GLOBAL_CORE_JS_PROMISE && V8_VERSION === 66) return true;\n  // We need Promise#finally in the pure version for preventing prototype pollution\n  if (IS_PURE && !PromiseConstructorPrototype['finally']) return true;\n  // We can't use @@species feature detection in V8 since it causes\n  // deoptimization and performance degradation\n  // https://github.com/zloirock/core-js/issues/679\n  if (V8_VERSION >= 51 && /native code/.test(PromiseConstructor)) return false;\n  // Detect correctness of subclassing with @@species support\n  var promise = new PromiseConstructor(function (resolve) { resolve(1); });\n  var FakePromise = function (exec) {\n    exec(function () { /* empty */ }, function () { /* empty */ });\n  };\n  var constructor = promise.constructor = {};\n  constructor[SPECIES] = FakePromise;\n  SUBCLASSING = promise.then(function () { /* empty */ }) instanceof FakePromise;\n  if (!SUBCLASSING) return true;\n  // Unhandled rejections tracking support, NodeJS Promise without it fails @@species test\n  return !GLOBAL_CORE_JS_PROMISE && IS_BROWSER && !NATIVE_REJECTION_EVENT;\n});\n\nvar INCORRECT_ITERATION = FORCED || !checkCorrectnessOfIteration(function (iterable) {\n  PromiseConstructor.all(iterable)['catch'](function () { /* empty */ });\n});\n\n// helpers\nvar isThenable = function (it) {\n  var then;\n  return isObject(it) && typeof (then = it.then) == 'function' ? then : false;\n};\n\nvar notify = function (state, isReject) {\n  if (state.notified) return;\n  state.notified = true;\n  var chain = state.reactions;\n  microtask(function () {\n    var value = state.value;\n    var ok = state.state == FULFILLED;\n    var index = 0;\n    // variable length - can't use forEach\n    while (chain.length > index) {\n      var reaction = chain[index++];\n      var handler = ok ? reaction.ok : reaction.fail;\n      var resolve = reaction.resolve;\n      var reject = reaction.reject;\n      var domain = reaction.domain;\n      var result, then, exited;\n      try {\n        if (handler) {\n          if (!ok) {\n            if (state.rejection === UNHANDLED) onHandleUnhandled(state);\n            state.rejection = HANDLED;\n          }\n          if (handler === true) result = value;\n          else {\n            if (domain) domain.enter();\n            result = handler(value); // can throw\n            if (domain) {\n              domain.exit();\n              exited = true;\n            }\n          }\n          if (result === reaction.promise) {\n            reject(TypeError('Promise-chain cycle'));\n          } else if (then = isThenable(result)) {\n            then.call(result, resolve, reject);\n          } else resolve(result);\n        } else reject(value);\n      } catch (error) {\n        if (domain && !exited) domain.exit();\n        reject(error);\n      }\n    }\n    state.reactions = [];\n    state.notified = false;\n    if (isReject && !state.rejection) onUnhandled(state);\n  });\n};\n\nvar dispatchEvent = function (name, promise, reason) {\n  var event, handler;\n  if (DISPATCH_EVENT) {\n    event = document.createEvent('Event');\n    event.promise = promise;\n    event.reason = reason;\n    event.initEvent(name, false, true);\n    global.dispatchEvent(event);\n  } else event = { promise: promise, reason: reason };\n  if (!NATIVE_REJECTION_EVENT && (handler = global['on' + name])) handler(event);\n  else if (name === UNHANDLED_REJECTION) hostReportErrors('Unhandled promise rejection', reason);\n};\n\nvar onUnhandled = function (state) {\n  task.call(global, function () {\n    var promise = state.facade;\n    var value = state.value;\n    var IS_UNHANDLED = isUnhandled(state);\n    var result;\n    if (IS_UNHANDLED) {\n      result = perform(function () {\n        if (IS_NODE) {\n          process.emit('unhandledRejection', value, promise);\n        } else dispatchEvent(UNHANDLED_REJECTION, promise, value);\n      });\n      // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should\n      state.rejection = IS_NODE || isUnhandled(state) ? UNHANDLED : HANDLED;\n      if (result.error) throw result.value;\n    }\n  });\n};\n\nvar isUnhandled = function (state) {\n  return state.rejection !== HANDLED && !state.parent;\n};\n\nvar onHandleUnhandled = function (state) {\n  task.call(global, function () {\n    var promise = state.facade;\n    if (IS_NODE) {\n      process.emit('rejectionHandled', promise);\n    } else dispatchEvent(REJECTION_HANDLED, promise, state.value);\n  });\n};\n\nvar bind = function (fn, state, unwrap) {\n  return function (value) {\n    fn(state, value, unwrap);\n  };\n};\n\nvar internalReject = function (state, value, unwrap) {\n  if (state.done) return;\n  state.done = true;\n  if (unwrap) state = unwrap;\n  state.value = value;\n  state.state = REJECTED;\n  notify(state, true);\n};\n\nvar internalResolve = function (state, value, unwrap) {\n  if (state.done) return;\n  state.done = true;\n  if (unwrap) state = unwrap;\n  try {\n    if (state.facade === value) throw TypeError(\"Promise can't be resolved itself\");\n    var then = isThenable(value);\n    if (then) {\n      microtask(function () {\n        var wrapper = { done: false };\n        try {\n          then.call(value,\n            bind(internalResolve, wrapper, state),\n            bind(internalReject, wrapper, state)\n          );\n        } catch (error) {\n          internalReject(wrapper, error, state);\n        }\n      });\n    } else {\n      state.value = value;\n      state.state = FULFILLED;\n      notify(state, false);\n    }\n  } catch (error) {\n    internalReject({ done: false }, error, state);\n  }\n};\n\n// constructor polyfill\nif (FORCED) {\n  // 25.4.3.1 Promise(executor)\n  PromiseConstructor = function Promise(executor) {\n    anInstance(this, PromiseConstructor, PROMISE);\n    aFunction(executor);\n    Internal.call(this);\n    var state = getInternalState(this);\n    try {\n      executor(bind(internalResolve, state), bind(internalReject, state));\n    } catch (error) {\n      internalReject(state, error);\n    }\n  };\n  PromiseConstructorPrototype = PromiseConstructor.prototype;\n  // eslint-disable-next-line no-unused-vars -- required for `.length`\n  Internal = function Promise(executor) {\n    setInternalState(this, {\n      type: PROMISE,\n      done: false,\n      notified: false,\n      parent: false,\n      reactions: [],\n      rejection: false,\n      state: PENDING,\n      value: undefined\n    });\n  };\n  Internal.prototype = redefineAll(PromiseConstructorPrototype, {\n    // `Promise.prototype.then` method\n    // https://tc39.es/ecma262/#sec-promise.prototype.then\n    then: function then(onFulfilled, onRejected) {\n      var state = getInternalPromiseState(this);\n      var reaction = newPromiseCapability(speciesConstructor(this, PromiseConstructor));\n      reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true;\n      reaction.fail = typeof onRejected == 'function' && onRejected;\n      reaction.domain = IS_NODE ? process.domain : undefined;\n      state.parent = true;\n      state.reactions.push(reaction);\n      if (state.state != PENDING) notify(state, false);\n      return reaction.promise;\n    },\n    // `Promise.prototype.catch` method\n    // https://tc39.es/ecma262/#sec-promise.prototype.catch\n    'catch': function (onRejected) {\n      return this.then(undefined, onRejected);\n    }\n  });\n  OwnPromiseCapability = function () {\n    var promise = new Internal();\n    var state = getInternalState(promise);\n    this.promise = promise;\n    this.resolve = bind(internalResolve, state);\n    this.reject = bind(internalReject, state);\n  };\n  newPromiseCapabilityModule.f = newPromiseCapability = function (C) {\n    return C === PromiseConstructor || C === PromiseWrapper\n      ? new OwnPromiseCapability(C)\n      : newGenericPromiseCapability(C);\n  };\n\n  if (!IS_PURE && typeof NativePromise == 'function' && NativePromisePrototype !== Object.prototype) {\n    nativeThen = NativePromisePrototype.then;\n\n    if (!SUBCLASSING) {\n      // make `Promise#then` return a polyfilled `Promise` for native promise-based APIs\n      redefine(NativePromisePrototype, 'then', function then(onFulfilled, onRejected) {\n        var that = this;\n        return new PromiseConstructor(function (resolve, reject) {\n          nativeThen.call(that, resolve, reject);\n        }).then(onFulfilled, onRejected);\n      // https://github.com/zloirock/core-js/issues/640\n      }, { unsafe: true });\n\n      // makes sure that native promise-based APIs `Promise#catch` properly works with patched `Promise#then`\n      redefine(NativePromisePrototype, 'catch', PromiseConstructorPrototype['catch'], { unsafe: true });\n    }\n\n    // make `.constructor === Promise` work for native promise-based APIs\n    try {\n      delete NativePromisePrototype.constructor;\n    } catch (error) { /* empty */ }\n\n    // make `instanceof Promise` work for native promise-based APIs\n    if (setPrototypeOf) {\n      setPrototypeOf(NativePromisePrototype, PromiseConstructorPrototype);\n    }\n  }\n}\n\n$({ global: true, wrap: true, forced: FORCED }, {\n  Promise: PromiseConstructor\n});\n\nsetToStringTag(PromiseConstructor, PROMISE, false, true);\nsetSpecies(PROMISE);\n\nPromiseWrapper = getBuiltIn(PROMISE);\n\n// statics\n$({ target: PROMISE, stat: true, forced: FORCED }, {\n  // `Promise.reject` method\n  // https://tc39.es/ecma262/#sec-promise.reject\n  reject: function reject(r) {\n    var capability = newPromiseCapability(this);\n    capability.reject.call(undefined, r);\n    return capability.promise;\n  }\n});\n\n$({ target: PROMISE, stat: true, forced: IS_PURE || FORCED }, {\n  // `Promise.resolve` method\n  // https://tc39.es/ecma262/#sec-promise.resolve\n  resolve: function resolve(x) {\n    return promiseResolve(IS_PURE && this === PromiseWrapper ? PromiseConstructor : this, x);\n  }\n});\n\n$({ target: PROMISE, stat: true, forced: INCORRECT_ITERATION }, {\n  // `Promise.all` method\n  // https://tc39.es/ecma262/#sec-promise.all\n  all: function all(iterable) {\n    var C = this;\n    var capability = newPromiseCapability(C);\n    var resolve = capability.resolve;\n    var reject = capability.reject;\n    var result = perform(function () {\n      var $promiseResolve = aFunction(C.resolve);\n      var values = [];\n      var counter = 0;\n      var remaining = 1;\n      iterate(iterable, function (promise) {\n        var index = counter++;\n        var alreadyCalled = false;\n        values.push(undefined);\n        remaining++;\n        $promiseResolve.call(C, promise).then(function (value) {\n          if (alreadyCalled) return;\n          alreadyCalled = true;\n          values[index] = value;\n          --remaining || resolve(values);\n        }, reject);\n      });\n      --remaining || resolve(values);\n    });\n    if (result.error) reject(result.value);\n    return capability.promise;\n  },\n  // `Promise.race` method\n  // https://tc39.es/ecma262/#sec-promise.race\n  race: function race(iterable) {\n    var C = this;\n    var capability = newPromiseCapability(C);\n    var reject = capability.reject;\n    var result = perform(function () {\n      var $promiseResolve = aFunction(C.resolve);\n      iterate(iterable, function (promise) {\n        $promiseResolve.call(C, promise).then(capability.resolve, reject);\n      });\n    });\n    if (result.error) reject(result.value);\n    return capability.promise;\n  }\n});\n","var global = require('../internals/global');\n\nmodule.exports = function (a, b) {\n  var console = global.console;\n  if (console && console.error) {\n    arguments.length === 1 ? console.error(a) : console.error(a, b);\n  }\n};\n","module.exports = typeof window == 'object';\n","module.exports = function (it, Constructor, name) {\n  if (!(it instanceof Constructor)) {\n    throw TypeError('Incorrect ' + (name ? name + ' ' : '') + 'invocation');\n  } return it;\n};\n","module.exports = function (exec) {\n  try {\n    return { error: false, value: exec() };\n  } catch (error) {\n    return { error: true, value: error };\n  }\n};\n","'use strict';\nvar fails = require('../internals/fails');\n\nmodule.exports = function (METHOD_NAME, argument) {\n  var method = [][METHOD_NAME];\n  return !!method && fails(function () {\n    // eslint-disable-next-line no-useless-call,no-throw-literal -- required for testing\n    method.call(null, argument || function () { throw 1; }, 1);\n  });\n};\n","'use strict';\nvar $forEach = require('../internals/array-iteration').forEach;\nvar arrayMethodIsStrict = require('../internals/array-method-is-strict');\n\nvar STRICT_METHOD = arrayMethodIsStrict('forEach');\n\n// `Array.prototype.forEach` method implementation\n// https://tc39.es/ecma262/#sec-array.prototype.foreach\nmodule.exports = !STRICT_METHOD ? function forEach(callbackfn /* , thisArg */) {\n  return $forEach(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n// eslint-disable-next-line es/no-array-prototype-foreach -- safe\n} : [].forEach;\n","var global = require('../internals/global');\nvar DOMIterables = require('../internals/dom-iterables');\nvar forEach = require('../internals/array-for-each');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nfor (var COLLECTION_NAME in DOMIterables) {\n  var Collection = global[COLLECTION_NAME];\n  var CollectionPrototype = Collection && Collection.prototype;\n  // some Chrome versions have non-configurable methods on DOMTokenList\n  if (CollectionPrototype && CollectionPrototype.forEach !== forEach) try {\n    createNonEnumerableProperty(CollectionPrototype, 'forEach', forEach);\n  } catch (error) {\n    CollectionPrototype.forEach = forEach;\n  }\n}\n","// iterable DOM collections\n// flag - `iterable` interface - 'entries', 'keys', 'values', 'forEach' methods\nmodule.exports = {\n  CSSRuleList: 0,\n  CSSStyleDeclaration: 0,\n  CSSValueList: 0,\n  ClientRectList: 0,\n  DOMRectList: 0,\n  DOMStringList: 0,\n  DOMTokenList: 1,\n  DataTransferItemList: 0,\n  FileList: 0,\n  HTMLAllCollection: 0,\n  HTMLCollection: 0,\n  HTMLFormElement: 0,\n  HTMLSelectElement: 0,\n  MediaList: 0,\n  MimeTypeArray: 0,\n  NamedNodeMap: 0,\n  NodeList: 1,\n  PaintRequestList: 0,\n  Plugin: 0,\n  PluginArray: 0,\n  SVGLengthList: 0,\n  SVGNumberList: 0,\n  SVGPathSegList: 0,\n  SVGPointList: 0,\n  SVGStringList: 0,\n  SVGTransformList: 0,\n  SourceBufferList: 0,\n  StyleSheetList: 0,\n  TextTrackCueList: 0,\n  TextTrackList: 0,\n  TouchList: 0\n};\n","var anObject = require('../internals/an-object');\nvar iteratorClose = require('../internals/iterator-close');\n\n// call something on iterator step with safe closing on error\nmodule.exports = function (iterator, fn, value, ENTRIES) {\n  try {\n    return ENTRIES ? fn(anObject(value)[0], value[1]) : fn(value);\n  // 7.4.6 IteratorClose(iterator, completion)\n  } catch (error) {\n    iteratorClose(iterator);\n    throw error;\n  }\n};\n","'use strict';\nvar bind = require('../internals/function-bind-context');\nvar toObject = require('../internals/to-object');\nvar callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');\nvar isArrayIteratorMethod = require('../internals/is-array-iterator-method');\nvar toLength = require('../internals/to-length');\nvar createProperty = require('../internals/create-property');\nvar getIteratorMethod = require('../internals/get-iterator-method');\n\n// `Array.from` method implementation\n// https://tc39.es/ecma262/#sec-array.from\nmodule.exports = function from(arrayLike /* , mapfn = undefined, thisArg = undefined */) {\n  var O = toObject(arrayLike);\n  var C = typeof this == 'function' ? this : Array;\n  var argumentsLength = arguments.length;\n  var mapfn = argumentsLength > 1 ? arguments[1] : undefined;\n  var mapping = mapfn !== undefined;\n  var iteratorMethod = getIteratorMethod(O);\n  var index = 0;\n  var length, result, step, iterator, next, value;\n  if (mapping) mapfn = bind(mapfn, argumentsLength > 2 ? arguments[2] : undefined, 2);\n  // if the target is not iterable or it's an array with the default iterator - use a simple case\n  if (iteratorMethod != undefined && !(C == Array && isArrayIteratorMethod(iteratorMethod))) {\n    iterator = iteratorMethod.call(O);\n    next = iterator.next;\n    result = new C();\n    for (;!(step = next.call(iterator)).done; index++) {\n      value = mapping ? callWithSafeIterationClosing(iterator, mapfn, [step.value, index], true) : step.value;\n      createProperty(result, index, value);\n    }\n  } else {\n    length = toLength(O.length);\n    result = new C(length);\n    for (;length > index; index++) {\n      value = mapping ? mapfn(O[index], index) : O[index];\n      createProperty(result, index, value);\n    }\n  }\n  result.length = index;\n  return result;\n};\n","var $ = require('../internals/export');\nvar from = require('../internals/array-from');\nvar checkCorrectnessOfIteration = require('../internals/check-correctness-of-iteration');\n\nvar INCORRECT_ITERATION = !checkCorrectnessOfIteration(function (iterable) {\n  // eslint-disable-next-line es/no-array-from -- required for testing\n  Array.from(iterable);\n});\n\n// `Array.from` method\n// https://tc39.es/ecma262/#sec-array.from\n$({ target: 'Array', stat: true, forced: INCORRECT_ITERATION }, {\n  from: from\n});\n","var toInteger = require('../internals/to-integer');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\n\n// `String.prototype.{ codePointAt, at }` methods implementation\nvar createMethod = function (CONVERT_TO_STRING) {\n  return function ($this, pos) {\n    var S = String(requireObjectCoercible($this));\n    var position = toInteger(pos);\n    var size = S.length;\n    var first, second;\n    if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;\n    first = S.charCodeAt(position);\n    return first < 0xD800 || first > 0xDBFF || position + 1 === size\n      || (second = S.charCodeAt(position + 1)) < 0xDC00 || second > 0xDFFF\n        ? CONVERT_TO_STRING ? S.charAt(position) : first\n        : CONVERT_TO_STRING ? S.slice(position, position + 2) : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;\n  };\n};\n\nmodule.exports = {\n  // `String.prototype.codePointAt` method\n  // https://tc39.es/ecma262/#sec-string.prototype.codepointat\n  codeAt: createMethod(false),\n  // `String.prototype.at` method\n  // https://github.com/mathiasbynens/String.prototype.at\n  charAt: createMethod(true)\n};\n","'use strict';\nvar fails = require('../internals/fails');\nvar getPrototypeOf = require('../internals/object-get-prototype-of');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar has = require('../internals/has');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_PURE = require('../internals/is-pure');\n\nvar ITERATOR = wellKnownSymbol('iterator');\nvar BUGGY_SAFARI_ITERATORS = false;\n\nvar returnThis = function () { return this; };\n\n// `%IteratorPrototype%` object\n// https://tc39.es/ecma262/#sec-%iteratorprototype%-object\nvar IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;\n\n/* eslint-disable es/no-array-prototype-keys -- safe */\nif ([].keys) {\n  arrayIterator = [].keys();\n  // Safari 8 has buggy iterators w/o `next`\n  if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;\n  else {\n    PrototypeOfArrayIteratorPrototype = getPrototypeOf(getPrototypeOf(arrayIterator));\n    if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;\n  }\n}\n\nvar NEW_ITERATOR_PROTOTYPE = IteratorPrototype == undefined || fails(function () {\n  var test = {};\n  // FF44- legacy iterators case\n  return IteratorPrototype[ITERATOR].call(test) !== test;\n});\n\nif (NEW_ITERATOR_PROTOTYPE) IteratorPrototype = {};\n\n// 25.1.2.1.1 %IteratorPrototype%[@@iterator]()\nif ((!IS_PURE || NEW_ITERATOR_PROTOTYPE) && !has(IteratorPrototype, ITERATOR)) {\n  createNonEnumerableProperty(IteratorPrototype, ITERATOR, returnThis);\n}\n\nmodule.exports = {\n  IteratorPrototype: IteratorPrototype,\n  BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS\n};\n","var fails = require('../internals/fails');\n\nmodule.exports = !fails(function () {\n  function F() { /* empty */ }\n  F.prototype.constructor = null;\n  // eslint-disable-next-line es/no-object-getprototypeof -- required for testing\n  return Object.getPrototypeOf(new F()) !== F.prototype;\n});\n","var has = require('../internals/has');\nvar toObject = require('../internals/to-object');\nvar sharedKey = require('../internals/shared-key');\nvar CORRECT_PROTOTYPE_GETTER = require('../internals/correct-prototype-getter');\n\nvar IE_PROTO = sharedKey('IE_PROTO');\nvar ObjectPrototype = Object.prototype;\n\n// `Object.getPrototypeOf` method\n// https://tc39.es/ecma262/#sec-object.getprototypeof\n// eslint-disable-next-line es/no-object-getprototypeof -- safe\nmodule.exports = CORRECT_PROTOTYPE_GETTER ? Object.getPrototypeOf : function (O) {\n  O = toObject(O);\n  if (has(O, IE_PROTO)) return O[IE_PROTO];\n  if (typeof O.constructor == 'function' && O instanceof O.constructor) {\n    return O.constructor.prototype;\n  } return O instanceof Object ? ObjectPrototype : null;\n};\n","var anObject = require('../internals/an-object');\nvar defineProperties = require('../internals/object-define-properties');\nvar enumBugKeys = require('../internals/enum-bug-keys');\nvar hiddenKeys = require('../internals/hidden-keys');\nvar html = require('../internals/html');\nvar documentCreateElement = require('../internals/document-create-element');\nvar sharedKey = require('../internals/shared-key');\n\nvar GT = '>';\nvar LT = '<';\nvar PROTOTYPE = 'prototype';\nvar SCRIPT = 'script';\nvar IE_PROTO = sharedKey('IE_PROTO');\n\nvar EmptyConstructor = function () { /* empty */ };\n\nvar scriptTag = function (content) {\n  return LT + SCRIPT + GT + content + LT + '/' + SCRIPT + GT;\n};\n\n// Create object with fake `null` prototype: use ActiveX Object with cleared prototype\nvar NullProtoObjectViaActiveX = function (activeXDocument) {\n  activeXDocument.write(scriptTag(''));\n  activeXDocument.close();\n  var temp = activeXDocument.parentWindow.Object;\n  activeXDocument = null; // avoid memory leak\n  return temp;\n};\n\n// Create object with fake `null` prototype: use iframe Object with cleared prototype\nvar NullProtoObjectViaIFrame = function () {\n  // Thrash, waste and sodomy: IE GC bug\n  var iframe = documentCreateElement('iframe');\n  var JS = 'java' + SCRIPT + ':';\n  var iframeDocument;\n  iframe.style.display = 'none';\n  html.appendChild(iframe);\n  // https://github.com/zloirock/core-js/issues/475\n  iframe.src = String(JS);\n  iframeDocument = iframe.contentWindow.document;\n  iframeDocument.open();\n  iframeDocument.write(scriptTag('document.F=Object'));\n  iframeDocument.close();\n  return iframeDocument.F;\n};\n\n// Check for document.domain and active x support\n// No need to use active x approach when document.domain is not set\n// see https://github.com/es-shims/es5-shim/issues/150\n// variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346\n// avoid IE GC bug\nvar activeXDocument;\nvar NullProtoObject = function () {\n  try {\n    /* global ActiveXObject -- old IE */\n    activeXDocument = document.domain && new ActiveXObject('htmlfile');\n  } catch (error) { /* ignore */ }\n  NullProtoObject = activeXDocument ? NullProtoObjectViaActiveX(activeXDocument) : NullProtoObjectViaIFrame();\n  var length = enumBugKeys.length;\n  while (length--) delete NullProtoObject[PROTOTYPE][enumBugKeys[length]];\n  return NullProtoObject();\n};\n\nhiddenKeys[IE_PROTO] = true;\n\n// `Object.create` method\n// https://tc39.es/ecma262/#sec-object.create\nmodule.exports = Object.create || function create(O, Properties) {\n  var result;\n  if (O !== null) {\n    EmptyConstructor[PROTOTYPE] = anObject(O);\n    result = new EmptyConstructor();\n    EmptyConstructor[PROTOTYPE] = null;\n    // add \"__proto__\" for Object.getPrototypeOf polyfill\n    result[IE_PROTO] = O;\n  } else result = NullProtoObject();\n  return Properties === undefined ? result : defineProperties(result, Properties);\n};\n","var DESCRIPTORS = require('../internals/descriptors');\nvar definePropertyModule = require('../internals/object-define-property');\nvar anObject = require('../internals/an-object');\nvar objectKeys = require('../internals/object-keys');\n\n// `Object.defineProperties` method\n// https://tc39.es/ecma262/#sec-object.defineproperties\n// eslint-disable-next-line es/no-object-defineproperties -- safe\nmodule.exports = DESCRIPTORS ? Object.defineProperties : function defineProperties(O, Properties) {\n  anObject(O);\n  var keys = objectKeys(Properties);\n  var length = keys.length;\n  var index = 0;\n  var key;\n  while (length > index) definePropertyModule.f(O, key = keys[index++], Properties[key]);\n  return O;\n};\n","'use strict';\nvar IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;\nvar create = require('../internals/object-create');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar Iterators = require('../internals/iterators');\n\nvar returnThis = function () { return this; };\n\nmodule.exports = function (IteratorConstructor, NAME, next) {\n  var TO_STRING_TAG = NAME + ' Iterator';\n  IteratorConstructor.prototype = create(IteratorPrototype, { next: createPropertyDescriptor(1, next) });\n  setToStringTag(IteratorConstructor, TO_STRING_TAG, false, true);\n  Iterators[TO_STRING_TAG] = returnThis;\n  return IteratorConstructor;\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar createIteratorConstructor = require('../internals/create-iterator-constructor');\nvar getPrototypeOf = require('../internals/object-get-prototype-of');\nvar setPrototypeOf = require('../internals/object-set-prototype-of');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar IS_PURE = require('../internals/is-pure');\nvar Iterators = require('../internals/iterators');\nvar IteratorsCore = require('../internals/iterators-core');\n\nvar IteratorPrototype = IteratorsCore.IteratorPrototype;\nvar BUGGY_SAFARI_ITERATORS = IteratorsCore.BUGGY_SAFARI_ITERATORS;\nvar ITERATOR = wellKnownSymbol('iterator');\nvar KEYS = 'keys';\nvar VALUES = 'values';\nvar ENTRIES = 'entries';\n\nvar returnThis = function () { return this; };\n\nmodule.exports = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {\n  createIteratorConstructor(IteratorConstructor, NAME, next);\n\n  var getIterationMethod = function (KIND) {\n    if (KIND === DEFAULT && defaultIterator) return defaultIterator;\n    if (!BUGGY_SAFARI_ITERATORS && KIND in IterablePrototype) return IterablePrototype[KIND];\n    switch (KIND) {\n      case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };\n      case VALUES: return function values() { return new IteratorConstructor(this, KIND); };\n      case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };\n    } return function () { return new IteratorConstructor(this); };\n  };\n\n  var TO_STRING_TAG = NAME + ' Iterator';\n  var INCORRECT_VALUES_NAME = false;\n  var IterablePrototype = Iterable.prototype;\n  var nativeIterator = IterablePrototype[ITERATOR]\n    || IterablePrototype['@@iterator']\n    || DEFAULT && IterablePrototype[DEFAULT];\n  var defaultIterator = !BUGGY_SAFARI_ITERATORS && nativeIterator || getIterationMethod(DEFAULT);\n  var anyNativeIterator = NAME == 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;\n  var CurrentIteratorPrototype, methods, KEY;\n\n  // fix native\n  if (anyNativeIterator) {\n    CurrentIteratorPrototype = getPrototypeOf(anyNativeIterator.call(new Iterable()));\n    if (IteratorPrototype !== Object.prototype && CurrentIteratorPrototype.next) {\n      if (!IS_PURE && getPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype) {\n        if (setPrototypeOf) {\n          setPrototypeOf(CurrentIteratorPrototype, IteratorPrototype);\n        } else if (typeof CurrentIteratorPrototype[ITERATOR] != 'function') {\n          createNonEnumerableProperty(CurrentIteratorPrototype, ITERATOR, returnThis);\n        }\n      }\n      // Set @@toStringTag to native iterators\n      setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true, true);\n      if (IS_PURE) Iterators[TO_STRING_TAG] = returnThis;\n    }\n  }\n\n  // fix Array#{values, @@iterator}.name in V8 / FF\n  if (DEFAULT == VALUES && nativeIterator && nativeIterator.name !== VALUES) {\n    INCORRECT_VALUES_NAME = true;\n    defaultIterator = function values() { return nativeIterator.call(this); };\n  }\n\n  // define iterator\n  if ((!IS_PURE || FORCED) && IterablePrototype[ITERATOR] !== defaultIterator) {\n    createNonEnumerableProperty(IterablePrototype, ITERATOR, defaultIterator);\n  }\n  Iterators[NAME] = defaultIterator;\n\n  // export additional methods\n  if (DEFAULT) {\n    methods = {\n      values: getIterationMethod(VALUES),\n      keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),\n      entries: getIterationMethod(ENTRIES)\n    };\n    if (FORCED) for (KEY in methods) {\n      if (BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {\n        redefine(IterablePrototype, KEY, methods[KEY]);\n      }\n    } else $({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME }, methods);\n  }\n\n  return methods;\n};\n","'use strict';\nvar charAt = require('../internals/string-multibyte').charAt;\nvar InternalStateModule = require('../internals/internal-state');\nvar defineIterator = require('../internals/define-iterator');\n\nvar STRING_ITERATOR = 'String Iterator';\nvar setInternalState = InternalStateModule.set;\nvar getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);\n\n// `String.prototype[@@iterator]` method\n// https://tc39.es/ecma262/#sec-string.prototype-@@iterator\ndefineIterator(String, 'String', function (iterated) {\n  setInternalState(this, {\n    type: STRING_ITERATOR,\n    string: String(iterated),\n    index: 0\n  });\n// `%StringIteratorPrototype%.next` method\n// https://tc39.es/ecma262/#sec-%stringiteratorprototype%.next\n}, function next() {\n  var state = getInternalState(this);\n  var string = state.string;\n  var index = state.index;\n  var point;\n  if (index >= string.length) return { value: undefined, done: true };\n  point = charAt(string, index);\n  state.index += point.length;\n  return { value: point, done: false };\n});\n","// a string of all valid unicode whitespaces\nmodule.exports = '\\u0009\\u000A\\u000B\\u000C\\u000D\\u0020\\u00A0\\u1680\\u2000\\u2001\\u2002' +\n  '\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200A\\u202F\\u205F\\u3000\\u2028\\u2029\\uFEFF';\n","var requireObjectCoercible = require('../internals/require-object-coercible');\nvar whitespaces = require('../internals/whitespaces');\n\nvar whitespace = '[' + whitespaces + ']';\nvar ltrim = RegExp('^' + whitespace + whitespace + '*');\nvar rtrim = RegExp(whitespace + whitespace + '*$');\n\n// `String.prototype.{ trim, trimStart, trimEnd, trimLeft, trimRight }` methods implementation\nvar createMethod = function (TYPE) {\n  return function ($this) {\n    var string = String(requireObjectCoercible($this));\n    if (TYPE & 1) string = string.replace(ltrim, '');\n    if (TYPE & 2) string = string.replace(rtrim, '');\n    return string;\n  };\n};\n\nmodule.exports = {\n  // `String.prototype.{ trimLeft, trimStart }` methods\n  // https://tc39.es/ecma262/#sec-string.prototype.trimstart\n  start: createMethod(1),\n  // `String.prototype.{ trimRight, trimEnd }` methods\n  // https://tc39.es/ecma262/#sec-string.prototype.trimend\n  end: createMethod(2),\n  // `String.prototype.trim` method\n  // https://tc39.es/ecma262/#sec-string.prototype.trim\n  trim: createMethod(3)\n};\n","var fails = require('../internals/fails');\nvar whitespaces = require('../internals/whitespaces');\n\nvar non = '\\u200B\\u0085\\u180E';\n\n// check that a method works with the correct list\n// of whitespaces and has a correct name\nmodule.exports = function (METHOD_NAME) {\n  return fails(function () {\n    return !!whitespaces[METHOD_NAME]() || non[METHOD_NAME]() != non || whitespaces[METHOD_NAME].name !== METHOD_NAME;\n  });\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar $trim = require('../internals/string-trim').trim;\nvar forcedStringTrimMethod = require('../internals/string-trim-forced');\n\n// `String.prototype.trim` method\n// https://tc39.es/ecma262/#sec-string.prototype.trim\n$({ target: 'String', proto: true, forced: forcedStringTrimMethod('trim') }, {\n  trim: function trim() {\n    return $trim(this);\n  }\n});\n","/* eslint-disable es/no-object-getownpropertynames -- safe */\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar $getOwnPropertyNames = require('../internals/object-get-own-property-names').f;\n\nvar toString = {}.toString;\n\nvar windowNames = typeof window == 'object' && window && Object.getOwnPropertyNames\n  ? Object.getOwnPropertyNames(window) : [];\n\nvar getWindowNames = function (it) {\n  try {\n    return $getOwnPropertyNames(it);\n  } catch (error) {\n    return windowNames.slice();\n  }\n};\n\n// fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window\nmodule.exports.f = function getOwnPropertyNames(it) {\n  return windowNames && toString.call(it) == '[object Window]'\n    ? getWindowNames(it)\n    : $getOwnPropertyNames(toIndexedObject(it));\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\n\nexports.f = wellKnownSymbol;\n","var path = require('../internals/path');\nvar has = require('../internals/has');\nvar wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');\nvar defineProperty = require('../internals/object-define-property').f;\n\nmodule.exports = function (NAME) {\n  var Symbol = path.Symbol || (path.Symbol = {});\n  if (!has(Symbol, NAME)) defineProperty(Symbol, NAME, {\n    value: wrappedWellKnownSymbolModule.f(NAME)\n  });\n};\n","'use strict';\nvar $ = require('../internals/export');\nvar global = require('../internals/global');\nvar getBuiltIn = require('../internals/get-built-in');\nvar IS_PURE = require('../internals/is-pure');\nvar DESCRIPTORS = require('../internals/descriptors');\nvar NATIVE_SYMBOL = require('../internals/native-symbol');\nvar USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');\nvar fails = require('../internals/fails');\nvar has = require('../internals/has');\nvar isArray = require('../internals/is-array');\nvar isObject = require('../internals/is-object');\nvar anObject = require('../internals/an-object');\nvar toObject = require('../internals/to-object');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar toPrimitive = require('../internals/to-primitive');\nvar createPropertyDescriptor = require('../internals/create-property-descriptor');\nvar nativeObjectCreate = require('../internals/object-create');\nvar objectKeys = require('../internals/object-keys');\nvar getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');\nvar getOwnPropertyNamesExternal = require('../internals/object-get-own-property-names-external');\nvar getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');\nvar getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');\nvar definePropertyModule = require('../internals/object-define-property');\nvar propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\nvar redefine = require('../internals/redefine');\nvar shared = require('../internals/shared');\nvar sharedKey = require('../internals/shared-key');\nvar hiddenKeys = require('../internals/hidden-keys');\nvar uid = require('../internals/uid');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');\nvar defineWellKnownSymbol = require('../internals/define-well-known-symbol');\nvar setToStringTag = require('../internals/set-to-string-tag');\nvar InternalStateModule = require('../internals/internal-state');\nvar $forEach = require('../internals/array-iteration').forEach;\n\nvar HIDDEN = sharedKey('hidden');\nvar SYMBOL = 'Symbol';\nvar PROTOTYPE = 'prototype';\nvar TO_PRIMITIVE = wellKnownSymbol('toPrimitive');\nvar setInternalState = InternalStateModule.set;\nvar getInternalState = InternalStateModule.getterFor(SYMBOL);\nvar ObjectPrototype = Object[PROTOTYPE];\nvar $Symbol = global.Symbol;\nvar $stringify = getBuiltIn('JSON', 'stringify');\nvar nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;\nvar nativeDefineProperty = definePropertyModule.f;\nvar nativeGetOwnPropertyNames = getOwnPropertyNamesExternal.f;\nvar nativePropertyIsEnumerable = propertyIsEnumerableModule.f;\nvar AllSymbols = shared('symbols');\nvar ObjectPrototypeSymbols = shared('op-symbols');\nvar StringToSymbolRegistry = shared('string-to-symbol-registry');\nvar SymbolToStringRegistry = shared('symbol-to-string-registry');\nvar WellKnownSymbolsStore = shared('wks');\nvar QObject = global.QObject;\n// Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173\nvar USE_SETTER = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;\n\n// fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687\nvar setSymbolDescriptor = DESCRIPTORS && fails(function () {\n  return nativeObjectCreate(nativeDefineProperty({}, 'a', {\n    get: function () { return nativeDefineProperty(this, 'a', { value: 7 }).a; }\n  })).a != 7;\n}) ? function (O, P, Attributes) {\n  var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor(ObjectPrototype, P);\n  if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];\n  nativeDefineProperty(O, P, Attributes);\n  if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {\n    nativeDefineProperty(ObjectPrototype, P, ObjectPrototypeDescriptor);\n  }\n} : nativeDefineProperty;\n\nvar wrap = function (tag, description) {\n  var symbol = AllSymbols[tag] = nativeObjectCreate($Symbol[PROTOTYPE]);\n  setInternalState(symbol, {\n    type: SYMBOL,\n    tag: tag,\n    description: description\n  });\n  if (!DESCRIPTORS) symbol.description = description;\n  return symbol;\n};\n\nvar isSymbol = USE_SYMBOL_AS_UID ? function (it) {\n  return typeof it == 'symbol';\n} : function (it) {\n  return Object(it) instanceof $Symbol;\n};\n\nvar $defineProperty = function defineProperty(O, P, Attributes) {\n  if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);\n  anObject(O);\n  var key = toPrimitive(P, true);\n  anObject(Attributes);\n  if (has(AllSymbols, key)) {\n    if (!Attributes.enumerable) {\n      if (!has(O, HIDDEN)) nativeDefineProperty(O, HIDDEN, createPropertyDescriptor(1, {}));\n      O[HIDDEN][key] = true;\n    } else {\n      if (has(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;\n      Attributes = nativeObjectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });\n    } return setSymbolDescriptor(O, key, Attributes);\n  } return nativeDefineProperty(O, key, Attributes);\n};\n\nvar $defineProperties = function defineProperties(O, Properties) {\n  anObject(O);\n  var properties = toIndexedObject(Properties);\n  var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));\n  $forEach(keys, function (key) {\n    if (!DESCRIPTORS || $propertyIsEnumerable.call(properties, key)) $defineProperty(O, key, properties[key]);\n  });\n  return O;\n};\n\nvar $create = function create(O, Properties) {\n  return Properties === undefined ? nativeObjectCreate(O) : $defineProperties(nativeObjectCreate(O), Properties);\n};\n\nvar $propertyIsEnumerable = function propertyIsEnumerable(V) {\n  var P = toPrimitive(V, true);\n  var enumerable = nativePropertyIsEnumerable.call(this, P);\n  if (this === ObjectPrototype && has(AllSymbols, P) && !has(ObjectPrototypeSymbols, P)) return false;\n  return enumerable || !has(this, P) || !has(AllSymbols, P) || has(this, HIDDEN) && this[HIDDEN][P] ? enumerable : true;\n};\n\nvar $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {\n  var it = toIndexedObject(O);\n  var key = toPrimitive(P, true);\n  if (it === ObjectPrototype && has(AllSymbols, key) && !has(ObjectPrototypeSymbols, key)) return;\n  var descriptor = nativeGetOwnPropertyDescriptor(it, key);\n  if (descriptor && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) {\n    descriptor.enumerable = true;\n  }\n  return descriptor;\n};\n\nvar $getOwnPropertyNames = function getOwnPropertyNames(O) {\n  var names = nativeGetOwnPropertyNames(toIndexedObject(O));\n  var result = [];\n  $forEach(names, function (key) {\n    if (!has(AllSymbols, key) && !has(hiddenKeys, key)) result.push(key);\n  });\n  return result;\n};\n\nvar $getOwnPropertySymbols = function getOwnPropertySymbols(O) {\n  var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;\n  var names = nativeGetOwnPropertyNames(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));\n  var result = [];\n  $forEach(names, function (key) {\n    if (has(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || has(ObjectPrototype, key))) {\n      result.push(AllSymbols[key]);\n    }\n  });\n  return result;\n};\n\n// `Symbol` constructor\n// https://tc39.es/ecma262/#sec-symbol-constructor\nif (!NATIVE_SYMBOL) {\n  $Symbol = function Symbol() {\n    if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor');\n    var description = !arguments.length || arguments[0] === undefined ? undefined : String(arguments[0]);\n    var tag = uid(description);\n    var setter = function (value) {\n      if (this === ObjectPrototype) setter.call(ObjectPrototypeSymbols, value);\n      if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;\n      setSymbolDescriptor(this, tag, createPropertyDescriptor(1, value));\n    };\n    if (DESCRIPTORS && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });\n    return wrap(tag, description);\n  };\n\n  redefine($Symbol[PROTOTYPE], 'toString', function toString() {\n    return getInternalState(this).tag;\n  });\n\n  redefine($Symbol, 'withoutSetter', function (description) {\n    return wrap(uid(description), description);\n  });\n\n  propertyIsEnumerableModule.f = $propertyIsEnumerable;\n  definePropertyModule.f = $defineProperty;\n  getOwnPropertyDescriptorModule.f = $getOwnPropertyDescriptor;\n  getOwnPropertyNamesModule.f = getOwnPropertyNamesExternal.f = $getOwnPropertyNames;\n  getOwnPropertySymbolsModule.f = $getOwnPropertySymbols;\n\n  wrappedWellKnownSymbolModule.f = function (name) {\n    return wrap(wellKnownSymbol(name), name);\n  };\n\n  if (DESCRIPTORS) {\n    // https://github.com/tc39/proposal-Symbol-description\n    nativeDefineProperty($Symbol[PROTOTYPE], 'description', {\n      configurable: true,\n      get: function description() {\n        return getInternalState(this).description;\n      }\n    });\n    if (!IS_PURE) {\n      redefine(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });\n    }\n  }\n}\n\n$({ global: true, wrap: true, forced: !NATIVE_SYMBOL, sham: !NATIVE_SYMBOL }, {\n  Symbol: $Symbol\n});\n\n$forEach(objectKeys(WellKnownSymbolsStore), function (name) {\n  defineWellKnownSymbol(name);\n});\n\n$({ target: SYMBOL, stat: true, forced: !NATIVE_SYMBOL }, {\n  // `Symbol.for` method\n  // https://tc39.es/ecma262/#sec-symbol.for\n  'for': function (key) {\n    var string = String(key);\n    if (has(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];\n    var symbol = $Symbol(string);\n    StringToSymbolRegistry[string] = symbol;\n    SymbolToStringRegistry[symbol] = string;\n    return symbol;\n  },\n  // `Symbol.keyFor` method\n  // https://tc39.es/ecma262/#sec-symbol.keyfor\n  keyFor: function keyFor(sym) {\n    if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol');\n    if (has(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];\n  },\n  useSetter: function () { USE_SETTER = true; },\n  useSimple: function () { USE_SETTER = false; }\n});\n\n$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL, sham: !DESCRIPTORS }, {\n  // `Object.create` method\n  // https://tc39.es/ecma262/#sec-object.create\n  create: $create,\n  // `Object.defineProperty` method\n  // https://tc39.es/ecma262/#sec-object.defineproperty\n  defineProperty: $defineProperty,\n  // `Object.defineProperties` method\n  // https://tc39.es/ecma262/#sec-object.defineproperties\n  defineProperties: $defineProperties,\n  // `Object.getOwnPropertyDescriptor` method\n  // https://tc39.es/ecma262/#sec-object.getownpropertydescriptors\n  getOwnPropertyDescriptor: $getOwnPropertyDescriptor\n});\n\n$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL }, {\n  // `Object.getOwnPropertyNames` method\n  // https://tc39.es/ecma262/#sec-object.getownpropertynames\n  getOwnPropertyNames: $getOwnPropertyNames,\n  // `Object.getOwnPropertySymbols` method\n  // https://tc39.es/ecma262/#sec-object.getownpropertysymbols\n  getOwnPropertySymbols: $getOwnPropertySymbols\n});\n\n// Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives\n// https://bugs.chromium.org/p/v8/issues/detail?id=3443\n$({ target: 'Object', stat: true, forced: fails(function () { getOwnPropertySymbolsModule.f(1); }) }, {\n  getOwnPropertySymbols: function getOwnPropertySymbols(it) {\n    return getOwnPropertySymbolsModule.f(toObject(it));\n  }\n});\n\n// `JSON.stringify` method behavior with symbols\n// https://tc39.es/ecma262/#sec-json.stringify\nif ($stringify) {\n  var FORCED_JSON_STRINGIFY = !NATIVE_SYMBOL || fails(function () {\n    var symbol = $Symbol();\n    // MS Edge converts symbol values to JSON as {}\n    return $stringify([symbol]) != '[null]'\n      // WebKit converts symbol values to JSON as null\n      || $stringify({ a: symbol }) != '{}'\n      // V8 throws on boxed symbols\n      || $stringify(Object(symbol)) != '{}';\n  });\n\n  $({ target: 'JSON', stat: true, forced: FORCED_JSON_STRINGIFY }, {\n    // eslint-disable-next-line no-unused-vars -- required for `.length`\n    stringify: function stringify(it, replacer, space) {\n      var args = [it];\n      var index = 1;\n      var $replacer;\n      while (arguments.length > index) args.push(arguments[index++]);\n      $replacer = replacer;\n      if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined\n      if (!isArray(replacer)) replacer = function (key, value) {\n        if (typeof $replacer == 'function') value = $replacer.call(this, key, value);\n        if (!isSymbol(value)) return value;\n      };\n      args[1] = replacer;\n      return $stringify.apply(null, args);\n    }\n  });\n}\n\n// `Symbol.prototype[@@toPrimitive]` method\n// https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive\nif (!$Symbol[PROTOTYPE][TO_PRIMITIVE]) {\n  createNonEnumerableProperty($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf);\n}\n// `Symbol.prototype[@@toStringTag]` property\n// https://tc39.es/ecma262/#sec-symbol.prototype-@@tostringtag\nsetToStringTag($Symbol, SYMBOL);\n\nhiddenKeys[HIDDEN] = true;\n","// `Symbol.prototype.description` getter\n// https://tc39.es/ecma262/#sec-symbol.prototype.description\n'use strict';\nvar $ = require('../internals/export');\nvar DESCRIPTORS = require('../internals/descriptors');\nvar global = require('../internals/global');\nvar has = require('../internals/has');\nvar isObject = require('../internals/is-object');\nvar defineProperty = require('../internals/object-define-property').f;\nvar copyConstructorProperties = require('../internals/copy-constructor-properties');\n\nvar NativeSymbol = global.Symbol;\n\nif (DESCRIPTORS && typeof NativeSymbol == 'function' && (!('description' in NativeSymbol.prototype) ||\n  // Safari 12 bug\n  NativeSymbol().description !== undefined\n)) {\n  var EmptyStringDescriptionStore = {};\n  // wrap Symbol constructor for correct work with undefined description\n  var SymbolWrapper = function Symbol() {\n    var description = arguments.length < 1 || arguments[0] === undefined ? undefined : String(arguments[0]);\n    var result = this instanceof SymbolWrapper\n      ? new NativeSymbol(description)\n      // in Edge 13, String(Symbol(undefined)) === 'Symbol(undefined)'\n      : description === undefined ? NativeSymbol() : NativeSymbol(description);\n    if (description === '') EmptyStringDescriptionStore[result] = true;\n    return result;\n  };\n  copyConstructorProperties(SymbolWrapper, NativeSymbol);\n  var symbolPrototype = SymbolWrapper.prototype = NativeSymbol.prototype;\n  symbolPrototype.constructor = SymbolWrapper;\n\n  var symbolToString = symbolPrototype.toString;\n  var native = String(NativeSymbol('test')) == 'Symbol(test)';\n  var regexp = /^Symbol\\((.*)\\)[^)]+$/;\n  defineProperty(symbolPrototype, 'description', {\n    configurable: true,\n    get: function description() {\n      var symbol = isObject(this) ? this.valueOf() : this;\n      var string = symbolToString.call(symbol);\n      if (has(EmptyStringDescriptionStore, symbol)) return '';\n      var desc = native ? string.slice(7, -1) : string.replace(regexp, '$1');\n      return desc === '' ? undefined : desc;\n    }\n  });\n\n  $({ global: true, forced: true }, {\n    Symbol: SymbolWrapper\n  });\n}\n","'use strict';\nvar anObject = require('../internals/an-object');\n\n// `RegExp.prototype.flags` getter implementation\n// https://tc39.es/ecma262/#sec-get-regexp.prototype.flags\nmodule.exports = function () {\n  var that = anObject(this);\n  var result = '';\n  if (that.global) result += 'g';\n  if (that.ignoreCase) result += 'i';\n  if (that.multiline) result += 'm';\n  if (that.dotAll) result += 's';\n  if (that.unicode) result += 'u';\n  if (that.sticky) result += 'y';\n  return result;\n};\n","'use strict';\n\nvar fails = require('./fails');\n\n// babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError,\n// so we use an intermediate function.\nfunction RE(s, f) {\n  return RegExp(s, f);\n}\n\nexports.UNSUPPORTED_Y = fails(function () {\n  // babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError\n  var re = RE('a', 'y');\n  re.lastIndex = 2;\n  return re.exec('abcd') != null;\n});\n\nexports.BROKEN_CARET = fails(function () {\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=773687\n  var re = RE('^r', 'gy');\n  re.lastIndex = 2;\n  return re.exec('str') != null;\n});\n","'use strict';\n/* eslint-disable regexp/no-assertion-capturing-group, regexp/no-empty-group, regexp/no-lazy-ends -- testing */\n/* eslint-disable regexp/no-useless-quantifier -- testing */\nvar regexpFlags = require('./regexp-flags');\nvar stickyHelpers = require('./regexp-sticky-helpers');\nvar shared = require('./shared');\n\nvar nativeExec = RegExp.prototype.exec;\nvar nativeReplace = shared('native-string-replace', String.prototype.replace);\n\nvar patchedExec = nativeExec;\n\nvar UPDATES_LAST_INDEX_WRONG = (function () {\n  var re1 = /a/;\n  var re2 = /b*/g;\n  nativeExec.call(re1, 'a');\n  nativeExec.call(re2, 'a');\n  return re1.lastIndex !== 0 || re2.lastIndex !== 0;\n})();\n\nvar UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y || stickyHelpers.BROKEN_CARET;\n\n// nonparticipating capturing group, copied from es5-shim's String#split patch.\nvar NPCG_INCLUDED = /()??/.exec('')[1] !== undefined;\n\nvar PATCH = UPDATES_LAST_INDEX_WRONG || NPCG_INCLUDED || UNSUPPORTED_Y;\n\nif (PATCH) {\n  patchedExec = function exec(str) {\n    var re = this;\n    var lastIndex, reCopy, match, i;\n    var sticky = UNSUPPORTED_Y && re.sticky;\n    var flags = regexpFlags.call(re);\n    var source = re.source;\n    var charsAdded = 0;\n    var strCopy = str;\n\n    if (sticky) {\n      flags = flags.replace('y', '');\n      if (flags.indexOf('g') === -1) {\n        flags += 'g';\n      }\n\n      strCopy = String(str).slice(re.lastIndex);\n      // Support anchored sticky behavior.\n      if (re.lastIndex > 0 && (!re.multiline || re.multiline && str[re.lastIndex - 1] !== '\\n')) {\n        source = '(?: ' + source + ')';\n        strCopy = ' ' + strCopy;\n        charsAdded++;\n      }\n      // ^(? + rx + ) is needed, in combination with some str slicing, to\n      // simulate the 'y' flag.\n      reCopy = new RegExp('^(?:' + source + ')', flags);\n    }\n\n    if (NPCG_INCLUDED) {\n      reCopy = new RegExp('^' + source + '$(?!\\\\s)', flags);\n    }\n    if (UPDATES_LAST_INDEX_WRONG) lastIndex = re.lastIndex;\n\n    match = nativeExec.call(sticky ? reCopy : re, strCopy);\n\n    if (sticky) {\n      if (match) {\n        match.input = match.input.slice(charsAdded);\n        match[0] = match[0].slice(charsAdded);\n        match.index = re.lastIndex;\n        re.lastIndex += match[0].length;\n      } else re.lastIndex = 0;\n    } else if (UPDATES_LAST_INDEX_WRONG && match) {\n      re.lastIndex = re.global ? match.index + match[0].length : lastIndex;\n    }\n    if (NPCG_INCLUDED && match && match.length > 1) {\n      // Fix browsers whose `exec` methods don't consistently return `undefined`\n      // for NPCG, like IE8. NOTE: This doesn' work for /(.?)?/\n      nativeReplace.call(match[0], reCopy, function () {\n        for (i = 1; i < arguments.length - 2; i++) {\n          if (arguments[i] === undefined) match[i] = undefined;\n        }\n      });\n    }\n\n    return match;\n  };\n}\n\nmodule.exports = patchedExec;\n","'use strict';\nvar $ = require('../internals/export');\nvar exec = require('../internals/regexp-exec');\n\n// `RegExp.prototype.exec` method\n// https://tc39.es/ecma262/#sec-regexp.prototype.exec\n$({ target: 'RegExp', proto: true, forced: /./.exec !== exec }, {\n  exec: exec\n});\n","'use strict';\n// TODO: Remove from `core-js@4` since it's moved to entry points\nrequire('../modules/es.regexp.exec');\nvar redefine = require('../internals/redefine');\nvar regexpExec = require('../internals/regexp-exec');\nvar fails = require('../internals/fails');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar createNonEnumerableProperty = require('../internals/create-non-enumerable-property');\n\nvar SPECIES = wellKnownSymbol('species');\nvar RegExpPrototype = RegExp.prototype;\n\nvar REPLACE_SUPPORTS_NAMED_GROUPS = !fails(function () {\n  // #replace needs built-in support for named groups.\n  // #match works fine because it just return the exec results, even if it has\n  // a \"grops\" property.\n  var re = /./;\n  re.exec = function () {\n    var result = [];\n    result.groups = { a: '7' };\n    return result;\n  };\n  return ''.replace(re, '$<a>') !== '7';\n});\n\n// IE <= 11 replaces $0 with the whole match, as if it was $&\n// https://stackoverflow.com/questions/6024666/getting-ie-to-replace-a-regex-with-the-literal-string-0\nvar REPLACE_KEEPS_$0 = (function () {\n  // eslint-disable-next-line regexp/prefer-escape-replacement-dollar-char -- required for testing\n  return 'a'.replace(/./, '$0') === '$0';\n})();\n\nvar REPLACE = wellKnownSymbol('replace');\n// Safari <= 13.0.3(?) substitutes nth capture where n>m with an empty string\nvar REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = (function () {\n  if (/./[REPLACE]) {\n    return /./[REPLACE]('a', '$0') === '';\n  }\n  return false;\n})();\n\n// Chrome 51 has a buggy \"split\" implementation when RegExp#exec !== nativeExec\n// Weex JS has frozen built-in prototypes, so use try / catch wrapper\nvar SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {\n  // eslint-disable-next-line regexp/no-empty-group -- required for testing\n  var re = /(?:)/;\n  var originalExec = re.exec;\n  re.exec = function () { return originalExec.apply(this, arguments); };\n  var result = 'ab'.split(re);\n  return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';\n});\n\nmodule.exports = function (KEY, length, exec, sham) {\n  var SYMBOL = wellKnownSymbol(KEY);\n\n  var DELEGATES_TO_SYMBOL = !fails(function () {\n    // String methods call symbol-named RegEp methods\n    var O = {};\n    O[SYMBOL] = function () { return 7; };\n    return ''[KEY](O) != 7;\n  });\n\n  var DELEGATES_TO_EXEC = DELEGATES_TO_SYMBOL && !fails(function () {\n    // Symbol-named RegExp methods call .exec\n    var execCalled = false;\n    var re = /a/;\n\n    if (KEY === 'split') {\n      // We can't use real regex here since it causes deoptimization\n      // and serious performance degradation in V8\n      // https://github.com/zloirock/core-js/issues/306\n      re = {};\n      // RegExp[@@split] doesn't call the regex's exec method, but first creates\n      // a new one. We need to return the patched regex when creating the new one.\n      re.constructor = {};\n      re.constructor[SPECIES] = function () { return re; };\n      re.flags = '';\n      re[SYMBOL] = /./[SYMBOL];\n    }\n\n    re.exec = function () { execCalled = true; return null; };\n\n    re[SYMBOL]('');\n    return !execCalled;\n  });\n\n  if (\n    !DELEGATES_TO_SYMBOL ||\n    !DELEGATES_TO_EXEC ||\n    (KEY === 'replace' && !(\n      REPLACE_SUPPORTS_NAMED_GROUPS &&\n      REPLACE_KEEPS_$0 &&\n      !REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE\n    )) ||\n    (KEY === 'split' && !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC)\n  ) {\n    var nativeRegExpMethod = /./[SYMBOL];\n    var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {\n      var $exec = regexp.exec;\n      if ($exec === regexpExec || $exec === RegExpPrototype.exec) {\n        if (DELEGATES_TO_SYMBOL && !forceStringMethod) {\n          // The native String method already delegates to @@method (this\n          // polyfilled function), leasing to infinite recursion.\n          // We avoid it by directly calling the native @@method method.\n          return { done: true, value: nativeRegExpMethod.call(regexp, str, arg2) };\n        }\n        return { done: true, value: nativeMethod.call(str, regexp, arg2) };\n      }\n      return { done: false };\n    }, {\n      REPLACE_KEEPS_$0: REPLACE_KEEPS_$0,\n      REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE: REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE\n    });\n    var stringMethod = methods[0];\n    var regexMethod = methods[1];\n\n    redefine(String.prototype, KEY, stringMethod);\n    redefine(RegExpPrototype, SYMBOL, length == 2\n      // 21.2.5.8 RegExp.prototype[@@replace](string, replaceValue)\n      // 21.2.5.11 RegExp.prototype[@@split](string, limit)\n      ? function (string, arg) { return regexMethod.call(string, this, arg); }\n      // 21.2.5.6 RegExp.prototype[@@match](string)\n      // 21.2.5.9 RegExp.prototype[@@search](string)\n      : function (string) { return regexMethod.call(string, this); }\n    );\n  }\n\n  if (sham) createNonEnumerableProperty(RegExpPrototype[SYMBOL], 'sham', true);\n};\n","'use strict';\nvar charAt = require('../internals/string-multibyte').charAt;\n\n// `AdvanceStringIndex` abstract operation\n// https://tc39.es/ecma262/#sec-advancestringindex\nmodule.exports = function (S, index, unicode) {\n  return index + (unicode ? charAt(S, index).length : 1);\n};\n","var classof = require('./classof-raw');\nvar regexpExec = require('./regexp-exec');\n\n// `RegExpExec` abstract operation\n// https://tc39.es/ecma262/#sec-regexpexec\nmodule.exports = function (R, S) {\n  var exec = R.exec;\n  if (typeof exec === 'function') {\n    var result = exec.call(R, S);\n    if (typeof result !== 'object') {\n      throw TypeError('RegExp exec method returned something other than an Object or null');\n    }\n    return result;\n  }\n\n  if (classof(R) !== 'RegExp') {\n    throw TypeError('RegExp#exec called on incompatible receiver');\n  }\n\n  return regexpExec.call(R, S);\n};\n\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar anObject = require('../internals/an-object');\nvar toLength = require('../internals/to-length');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar advanceStringIndex = require('../internals/advance-string-index');\nvar regExpExec = require('../internals/regexp-exec-abstract');\n\n// @@match logic\nfixRegExpWellKnownSymbolLogic('match', 1, function (MATCH, nativeMatch, maybeCallNative) {\n  return [\n    // `String.prototype.match` method\n    // https://tc39.es/ecma262/#sec-string.prototype.match\n    function match(regexp) {\n      var O = requireObjectCoercible(this);\n      var matcher = regexp == undefined ? undefined : regexp[MATCH];\n      return matcher !== undefined ? matcher.call(regexp, O) : new RegExp(regexp)[MATCH](String(O));\n    },\n    // `RegExp.prototype[@@match]` method\n    // https://tc39.es/ecma262/#sec-regexp.prototype-@@match\n    function (regexp) {\n      var res = maybeCallNative(nativeMatch, regexp, this);\n      if (res.done) return res.value;\n\n      var rx = anObject(regexp);\n      var S = String(this);\n\n      if (!rx.global) return regExpExec(rx, S);\n\n      var fullUnicode = rx.unicode;\n      rx.lastIndex = 0;\n      var A = [];\n      var n = 0;\n      var result;\n      while ((result = regExpExec(rx, S)) !== null) {\n        var matchStr = String(result[0]);\n        A[n] = matchStr;\n        if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);\n        n++;\n      }\n      return n === 0 ? null : A;\n    }\n  ];\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\nvar toInteger = require('../internals/to-integer');\nvar toLength = require('../internals/to-length');\nvar toObject = require('../internals/to-object');\nvar arraySpeciesCreate = require('../internals/array-species-create');\nvar createProperty = require('../internals/create-property');\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('splice');\n\nvar max = Math.max;\nvar min = Math.min;\nvar MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;\nvar MAXIMUM_ALLOWED_LENGTH_EXCEEDED = 'Maximum allowed length exceeded';\n\n// `Array.prototype.splice` method\n// https://tc39.es/ecma262/#sec-array.prototype.splice\n// with adding support of @@species\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {\n  splice: function splice(start, deleteCount /* , ...items */) {\n    var O = toObject(this);\n    var len = toLength(O.length);\n    var actualStart = toAbsoluteIndex(start, len);\n    var argumentsLength = arguments.length;\n    var insertCount, actualDeleteCount, A, k, from, to;\n    if (argumentsLength === 0) {\n      insertCount = actualDeleteCount = 0;\n    } else if (argumentsLength === 1) {\n      insertCount = 0;\n      actualDeleteCount = len - actualStart;\n    } else {\n      insertCount = argumentsLength - 2;\n      actualDeleteCount = min(max(toInteger(deleteCount), 0), len - actualStart);\n    }\n    if (len + insertCount - actualDeleteCount > MAX_SAFE_INTEGER) {\n      throw TypeError(MAXIMUM_ALLOWED_LENGTH_EXCEEDED);\n    }\n    A = arraySpeciesCreate(O, actualDeleteCount);\n    for (k = 0; k < actualDeleteCount; k++) {\n      from = actualStart + k;\n      if (from in O) createProperty(A, k, O[from]);\n    }\n    A.length = actualDeleteCount;\n    if (insertCount < actualDeleteCount) {\n      for (k = actualStart; k < len - actualDeleteCount; k++) {\n        from = k + actualDeleteCount;\n        to = k + insertCount;\n        if (from in O) O[to] = O[from];\n        else delete O[to];\n      }\n      for (k = len; k > len - actualDeleteCount + insertCount; k--) delete O[k - 1];\n    } else if (insertCount > actualDeleteCount) {\n      for (k = len - actualDeleteCount; k > actualStart; k--) {\n        from = k + actualDeleteCount - 1;\n        to = k + insertCount - 1;\n        if (from in O) O[to] = O[from];\n        else delete O[to];\n      }\n    }\n    for (k = 0; k < insertCount; k++) {\n      O[k + actualStart] = arguments[k + 2];\n    }\n    O.length = len - actualDeleteCount + insertCount;\n    return A;\n  }\n});\n","var isObject = require('../internals/is-object');\nvar classof = require('../internals/classof-raw');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\n\nvar MATCH = wellKnownSymbol('match');\n\n// `IsRegExp` abstract operation\n// https://tc39.es/ecma262/#sec-isregexp\nmodule.exports = function (it) {\n  var isRegExp;\n  return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classof(it) == 'RegExp');\n};\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar isRegExp = require('../internals/is-regexp');\nvar anObject = require('../internals/an-object');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar speciesConstructor = require('../internals/species-constructor');\nvar advanceStringIndex = require('../internals/advance-string-index');\nvar toLength = require('../internals/to-length');\nvar callRegExpExec = require('../internals/regexp-exec-abstract');\nvar regexpExec = require('../internals/regexp-exec');\nvar stickyHelpers = require('../internals/regexp-sticky-helpers');\n\nvar UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;\nvar arrayPush = [].push;\nvar min = Math.min;\nvar MAX_UINT32 = 0xFFFFFFFF;\n\n// @@split logic\nfixRegExpWellKnownSymbolLogic('split', 2, function (SPLIT, nativeSplit, maybeCallNative) {\n  var internalSplit;\n  if (\n    'abbc'.split(/(b)*/)[1] == 'c' ||\n    // eslint-disable-next-line regexp/no-empty-group -- required for testing\n    'test'.split(/(?:)/, -1).length != 4 ||\n    'ab'.split(/(?:ab)*/).length != 2 ||\n    '.'.split(/(.?)(.?)/).length != 4 ||\n    // eslint-disable-next-line regexp/no-assertion-capturing-group, regexp/no-empty-group -- required for testing\n    '.'.split(/()()/).length > 1 ||\n    ''.split(/.?/).length\n  ) {\n    // based on es5-shim implementation, need to rework it\n    internalSplit = function (separator, limit) {\n      var string = String(requireObjectCoercible(this));\n      var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;\n      if (lim === 0) return [];\n      if (separator === undefined) return [string];\n      // If `separator` is not a regex, use native split\n      if (!isRegExp(separator)) {\n        return nativeSplit.call(string, separator, lim);\n      }\n      var output = [];\n      var flags = (separator.ignoreCase ? 'i' : '') +\n                  (separator.multiline ? 'm' : '') +\n                  (separator.unicode ? 'u' : '') +\n                  (separator.sticky ? 'y' : '');\n      var lastLastIndex = 0;\n      // Make `global` and avoid `lastIndex` issues by working with a copy\n      var separatorCopy = new RegExp(separator.source, flags + 'g');\n      var match, lastIndex, lastLength;\n      while (match = regexpExec.call(separatorCopy, string)) {\n        lastIndex = separatorCopy.lastIndex;\n        if (lastIndex > lastLastIndex) {\n          output.push(string.slice(lastLastIndex, match.index));\n          if (match.length > 1 && match.index < string.length) arrayPush.apply(output, match.slice(1));\n          lastLength = match[0].length;\n          lastLastIndex = lastIndex;\n          if (output.length >= lim) break;\n        }\n        if (separatorCopy.lastIndex === match.index) separatorCopy.lastIndex++; // Avoid an infinite loop\n      }\n      if (lastLastIndex === string.length) {\n        if (lastLength || !separatorCopy.test('')) output.push('');\n      } else output.push(string.slice(lastLastIndex));\n      return output.length > lim ? output.slice(0, lim) : output;\n    };\n  // Chakra, V8\n  } else if ('0'.split(undefined, 0).length) {\n    internalSplit = function (separator, limit) {\n      return separator === undefined && limit === 0 ? [] : nativeSplit.call(this, separator, limit);\n    };\n  } else internalSplit = nativeSplit;\n\n  return [\n    // `String.prototype.split` method\n    // https://tc39.es/ecma262/#sec-string.prototype.split\n    function split(separator, limit) {\n      var O = requireObjectCoercible(this);\n      var splitter = separator == undefined ? undefined : separator[SPLIT];\n      return splitter !== undefined\n        ? splitter.call(separator, O, limit)\n        : internalSplit.call(String(O), separator, limit);\n    },\n    // `RegExp.prototype[@@split]` method\n    // https://tc39.es/ecma262/#sec-regexp.prototype-@@split\n    //\n    // NOTE: This cannot be properly polyfilled in engines that don't support\n    // the 'y' flag.\n    function (regexp, limit) {\n      var res = maybeCallNative(internalSplit, regexp, this, limit, internalSplit !== nativeSplit);\n      if (res.done) return res.value;\n\n      var rx = anObject(regexp);\n      var S = String(this);\n      var C = speciesConstructor(rx, RegExp);\n\n      var unicodeMatching = rx.unicode;\n      var flags = (rx.ignoreCase ? 'i' : '') +\n                  (rx.multiline ? 'm' : '') +\n                  (rx.unicode ? 'u' : '') +\n                  (UNSUPPORTED_Y ? 'g' : 'y');\n\n      // ^(? + rx + ) is needed, in combination with some S slicing, to\n      // simulate the 'y' flag.\n      var splitter = new C(UNSUPPORTED_Y ? '^(?:' + rx.source + ')' : rx, flags);\n      var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;\n      if (lim === 0) return [];\n      if (S.length === 0) return callRegExpExec(splitter, S) === null ? [S] : [];\n      var p = 0;\n      var q = 0;\n      var A = [];\n      while (q < S.length) {\n        splitter.lastIndex = UNSUPPORTED_Y ? 0 : q;\n        var z = callRegExpExec(splitter, UNSUPPORTED_Y ? S.slice(q) : S);\n        var e;\n        if (\n          z === null ||\n          (e = min(toLength(splitter.lastIndex + (UNSUPPORTED_Y ? q : 0)), S.length)) === p\n        ) {\n          q = advanceStringIndex(S, q, unicodeMatching);\n        } else {\n          A.push(S.slice(p, q));\n          if (A.length === lim) return A;\n          for (var i = 1; i <= z.length - 1; i++) {\n            A.push(z[i]);\n            if (A.length === lim) return A;\n          }\n          q = p = e;\n        }\n      }\n      A.push(S.slice(p));\n      return A;\n    }\n  ];\n}, UNSUPPORTED_Y);\n","var isObject = require('../internals/is-object');\nvar setPrototypeOf = require('../internals/object-set-prototype-of');\n\n// makes subclassing work correct for wrapped built-ins\nmodule.exports = function ($this, dummy, Wrapper) {\n  var NewTarget, NewTargetPrototype;\n  if (\n    // it can work only with native `setPrototypeOf`\n    setPrototypeOf &&\n    // we haven't completely correct pre-ES6 way for getting `new.target`, so use this\n    typeof (NewTarget = dummy.constructor) == 'function' &&\n    NewTarget !== Wrapper &&\n    isObject(NewTargetPrototype = NewTarget.prototype) &&\n    NewTargetPrototype !== Wrapper.prototype\n  ) setPrototypeOf($this, NewTargetPrototype);\n  return $this;\n};\n","'use strict';\nvar DESCRIPTORS = require('../internals/descriptors');\nvar global = require('../internals/global');\nvar isForced = require('../internals/is-forced');\nvar redefine = require('../internals/redefine');\nvar has = require('../internals/has');\nvar classof = require('../internals/classof-raw');\nvar inheritIfRequired = require('../internals/inherit-if-required');\nvar toPrimitive = require('../internals/to-primitive');\nvar fails = require('../internals/fails');\nvar create = require('../internals/object-create');\nvar getOwnPropertyNames = require('../internals/object-get-own-property-names').f;\nvar getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;\nvar defineProperty = require('../internals/object-define-property').f;\nvar trim = require('../internals/string-trim').trim;\n\nvar NUMBER = 'Number';\nvar NativeNumber = global[NUMBER];\nvar NumberPrototype = NativeNumber.prototype;\n\n// Opera ~12 has broken Object#toString\nvar BROKEN_CLASSOF = classof(create(NumberPrototype)) == NUMBER;\n\n// `ToNumber` abstract operation\n// https://tc39.es/ecma262/#sec-tonumber\nvar toNumber = function (argument) {\n  var it = toPrimitive(argument, false);\n  var first, third, radix, maxCode, digits, length, index, code;\n  if (typeof it == 'string' && it.length > 2) {\n    it = trim(it);\n    first = it.charCodeAt(0);\n    if (first === 43 || first === 45) {\n      third = it.charCodeAt(2);\n      if (third === 88 || third === 120) return NaN; // Number('+0x1') should be NaN, old V8 fix\n    } else if (first === 48) {\n      switch (it.charCodeAt(1)) {\n        case 66: case 98: radix = 2; maxCode = 49; break; // fast equal of /^0b[01]+$/i\n        case 79: case 111: radix = 8; maxCode = 55; break; // fast equal of /^0o[0-7]+$/i\n        default: return +it;\n      }\n      digits = it.slice(2);\n      length = digits.length;\n      for (index = 0; index < length; index++) {\n        code = digits.charCodeAt(index);\n        // parseInt parses a string to a first unavailable symbol\n        // but ToNumber should return NaN if a string contains unavailable symbols\n        if (code < 48 || code > maxCode) return NaN;\n      } return parseInt(digits, radix);\n    }\n  } return +it;\n};\n\n// `Number` constructor\n// https://tc39.es/ecma262/#sec-number-constructor\nif (isForced(NUMBER, !NativeNumber(' 0o1') || !NativeNumber('0b1') || NativeNumber('+0x1'))) {\n  var NumberWrapper = function Number(value) {\n    var it = arguments.length < 1 ? 0 : value;\n    var dummy = this;\n    return dummy instanceof NumberWrapper\n      // check on 1..constructor(foo) case\n      && (BROKEN_CLASSOF ? fails(function () { NumberPrototype.valueOf.call(dummy); }) : classof(dummy) != NUMBER)\n        ? inheritIfRequired(new NativeNumber(toNumber(it)), dummy, NumberWrapper) : toNumber(it);\n  };\n  for (var keys = DESCRIPTORS ? getOwnPropertyNames(NativeNumber) : (\n    // ES3:\n    'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' +\n    // ES2015 (in case, if modules with ES2015 Number statics required before):\n    'EPSILON,isFinite,isInteger,isNaN,isSafeInteger,MAX_SAFE_INTEGER,' +\n    'MIN_SAFE_INTEGER,parseFloat,parseInt,isInteger,' +\n    // ESNext\n    'fromString,range'\n  ).split(','), j = 0, key; keys.length > j; j++) {\n    if (has(NativeNumber, key = keys[j]) && !has(NumberWrapper, key)) {\n      defineProperty(NumberWrapper, key, getOwnPropertyDescriptor(NativeNumber, key));\n    }\n  }\n  NumberWrapper.prototype = NumberPrototype;\n  NumberPrototype.constructor = NumberWrapper;\n  redefine(global, NUMBER, NumberWrapper);\n}\n","var DESCRIPTORS = require('../internals/descriptors');\nvar defineProperty = require('../internals/object-define-property').f;\n\nvar FunctionPrototype = Function.prototype;\nvar FunctionPrototypeToString = FunctionPrototype.toString;\nvar nameRE = /^\\s*function ([^ (]*)/;\nvar NAME = 'name';\n\n// Function instances `.name` property\n// https://tc39.es/ecma262/#sec-function-instances-name\nif (DESCRIPTORS && !(NAME in FunctionPrototype)) {\n  defineProperty(FunctionPrototype, NAME, {\n    configurable: true,\n    get: function () {\n      try {\n        return FunctionPrototypeToString.call(this).match(nameRE)[1];\n      } catch (error) {\n        return '';\n      }\n    }\n  });\n}\n","'use strict';\nvar $ = require('../internals/export');\nvar IndexedObject = require('../internals/indexed-object');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar arrayMethodIsStrict = require('../internals/array-method-is-strict');\n\nvar nativeJoin = [].join;\n\nvar ES3_STRINGS = IndexedObject != Object;\nvar STRICT_METHOD = arrayMethodIsStrict('join', ',');\n\n// `Array.prototype.join` method\n// https://tc39.es/ecma262/#sec-array.prototype.join\n$({ target: 'Array', proto: true, forced: ES3_STRINGS || !STRICT_METHOD }, {\n  join: function join(separator) {\n    return nativeJoin.call(toIndexedObject(this), separator === undefined ? ',' : separator);\n  }\n});\n","var toObject = require('../internals/to-object');\n\nvar floor = Math.floor;\nvar replace = ''.replace;\nvar SUBSTITUTION_SYMBOLS = /\\$([$&'`]|\\d{1,2}|<[^>]*>)/g;\nvar SUBSTITUTION_SYMBOLS_NO_NAMED = /\\$([$&'`]|\\d{1,2})/g;\n\n// https://tc39.es/ecma262/#sec-getsubstitution\nmodule.exports = function (matched, str, position, captures, namedCaptures, replacement) {\n  var tailPos = position + matched.length;\n  var m = captures.length;\n  var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED;\n  if (namedCaptures !== undefined) {\n    namedCaptures = toObject(namedCaptures);\n    symbols = SUBSTITUTION_SYMBOLS;\n  }\n  return replace.call(replacement, symbols, function (match, ch) {\n    var capture;\n    switch (ch.charAt(0)) {\n      case '$': return '$';\n      case '&': return matched;\n      case '`': return str.slice(0, position);\n      case \"'\": return str.slice(tailPos);\n      case '<':\n        capture = namedCaptures[ch.slice(1, -1)];\n        break;\n      default: // \\d\\d?\n        var n = +ch;\n        if (n === 0) return match;\n        if (n > m) {\n          var f = floor(n / 10);\n          if (f === 0) return match;\n          if (f <= m) return captures[f - 1] === undefined ? ch.charAt(1) : captures[f - 1] + ch.charAt(1);\n          return match;\n        }\n        capture = captures[n - 1];\n    }\n    return capture === undefined ? '' : capture;\n  });\n};\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar anObject = require('../internals/an-object');\nvar toLength = require('../internals/to-length');\nvar toInteger = require('../internals/to-integer');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar advanceStringIndex = require('../internals/advance-string-index');\nvar getSubstitution = require('../internals/get-substitution');\nvar regExpExec = require('../internals/regexp-exec-abstract');\n\nvar max = Math.max;\nvar min = Math.min;\n\nvar maybeToString = function (it) {\n  return it === undefined ? it : String(it);\n};\n\n// @@replace logic\nfixRegExpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, maybeCallNative, reason) {\n  var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = reason.REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE;\n  var REPLACE_KEEPS_$0 = reason.REPLACE_KEEPS_$0;\n  var UNSAFE_SUBSTITUTE = REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE ? '$' : '$0';\n\n  return [\n    // `String.prototype.replace` method\n    // https://tc39.es/ecma262/#sec-string.prototype.replace\n    function replace(searchValue, replaceValue) {\n      var O = requireObjectCoercible(this);\n      var replacer = searchValue == undefined ? undefined : searchValue[REPLACE];\n      return replacer !== undefined\n        ? replacer.call(searchValue, O, replaceValue)\n        : nativeReplace.call(String(O), searchValue, replaceValue);\n    },\n    // `RegExp.prototype[@@replace]` method\n    // https://tc39.es/ecma262/#sec-regexp.prototype-@@replace\n    function (regexp, replaceValue) {\n      if (\n        (!REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE && REPLACE_KEEPS_$0) ||\n        (typeof replaceValue === 'string' && replaceValue.indexOf(UNSAFE_SUBSTITUTE) === -1)\n      ) {\n        var res = maybeCallNative(nativeReplace, regexp, this, replaceValue);\n        if (res.done) return res.value;\n      }\n\n      var rx = anObject(regexp);\n      var S = String(this);\n\n      var functionalReplace = typeof replaceValue === 'function';\n      if (!functionalReplace) replaceValue = String(replaceValue);\n\n      var global = rx.global;\n      if (global) {\n        var fullUnicode = rx.unicode;\n        rx.lastIndex = 0;\n      }\n      var results = [];\n      while (true) {\n        var result = regExpExec(rx, S);\n        if (result === null) break;\n\n        results.push(result);\n        if (!global) break;\n\n        var matchStr = String(result[0]);\n        if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);\n      }\n\n      var accumulatedResult = '';\n      var nextSourcePosition = 0;\n      for (var i = 0; i < results.length; i++) {\n        result = results[i];\n\n        var matched = String(result[0]);\n        var position = max(min(toInteger(result.index), S.length), 0);\n        var captures = [];\n        // NOTE: This is equivalent to\n        //   captures = result.slice(1).map(maybeToString)\n        // but for some reason `nativeSlice.call(result, 1, result.length)` (called in\n        // the slice polyfill when slicing native arrays) \"doesn't work\" in safari 9 and\n        // causes a crash (https://pastebin.com/N21QzeQA) when trying to debug it.\n        for (var j = 1; j < result.length; j++) captures.push(maybeToString(result[j]));\n        var namedCaptures = result.groups;\n        if (functionalReplace) {\n          var replacerArgs = [matched].concat(captures, position, S);\n          if (namedCaptures !== undefined) replacerArgs.push(namedCaptures);\n          var replacement = String(replaceValue.apply(undefined, replacerArgs));\n        } else {\n          replacement = getSubstitution(matched, S, position, captures, namedCaptures, replaceValue);\n        }\n        if (position >= nextSourcePosition) {\n          accumulatedResult += S.slice(nextSourcePosition, position) + replacement;\n          nextSourcePosition = position + matched.length;\n        }\n      }\n      return accumulatedResult + S.slice(nextSourcePosition);\n    }\n  ];\n});\n","// `SameValue` abstract operation\n// https://tc39.es/ecma262/#sec-samevalue\n// eslint-disable-next-line es/no-object-is -- safe\nmodule.exports = Object.is || function is(x, y) {\n  // eslint-disable-next-line no-self-compare -- NaN check\n  return x === y ? x !== 0 || 1 / x === 1 / y : x != x && y != y;\n};\n","'use strict';\nvar fixRegExpWellKnownSymbolLogic = require('../internals/fix-regexp-well-known-symbol-logic');\nvar anObject = require('../internals/an-object');\nvar requireObjectCoercible = require('../internals/require-object-coercible');\nvar sameValue = require('../internals/same-value');\nvar regExpExec = require('../internals/regexp-exec-abstract');\n\n// @@search logic\nfixRegExpWellKnownSymbolLogic('search', 1, function (SEARCH, nativeSearch, maybeCallNative) {\n  return [\n    // `String.prototype.search` method\n    // https://tc39.es/ecma262/#sec-string.prototype.search\n    function search(regexp) {\n      var O = requireObjectCoercible(this);\n      var searcher = regexp == undefined ? undefined : regexp[SEARCH];\n      return searcher !== undefined ? searcher.call(regexp, O) : new RegExp(regexp)[SEARCH](String(O));\n    },\n    // `RegExp.prototype[@@search]` method\n    // https://tc39.es/ecma262/#sec-regexp.prototype-@@search\n    function (regexp) {\n      var res = maybeCallNative(nativeSearch, regexp, this);\n      if (res.done) return res.value;\n\n      var rx = anObject(regexp);\n      var S = String(this);\n\n      var previousLastIndex = rx.lastIndex;\n      if (!sameValue(previousLastIndex, 0)) rx.lastIndex = 0;\n      var result = regExpExec(rx, S);\n      if (!sameValue(rx.lastIndex, previousLastIndex)) rx.lastIndex = previousLastIndex;\n      return result === null ? -1 : result.index;\n    }\n  ];\n});\n","/**\n * Extend object a with the properties of object b.\n * If there's a conflict, object b takes precedence.\n *\n * @param {object} a\n * @param {object} b\n */\nexport const extend = ( a, b ) => {\n\n\tfor( let i in b ) {\n\t\ta[ i ] = b[ i ];\n\t}\n\n\treturn a;\n\n}\n\n/**\n * querySelectorAll but returns an Array.\n */\nexport const queryAll = ( el, selector ) => {\n\n\treturn Array.from( el.querySelectorAll( selector ) );\n\n}\n\n/**\n * classList.toggle() with cross browser support\n */\nexport const toggleClass = ( el, className, value ) => {\n\tif( value ) {\n\t\tel.classList.add( className );\n\t}\n\telse {\n\t\tel.classList.remove( className );\n\t}\n}\n\n/**\n * Utility for deserializing a value.\n *\n * @param {*} value\n * @return {*}\n */\nexport const deserialize = ( value ) => {\n\n\tif( typeof value === 'string' ) {\n\t\tif( value === 'null' ) return null;\n\t\telse if( value === 'true' ) return true;\n\t\telse if( value === 'false' ) return false;\n\t\telse if( value.match( /^-?[\\d\\.]+$/ ) ) return parseFloat( value );\n\t}\n\n\treturn value;\n\n}\n\n/**\n * Measures the distance in pixels between point a\n * and point b.\n *\n * @param {object} a point with x/y properties\n * @param {object} b point with x/y properties\n *\n * @return {number}\n */\nexport const distanceBetween = ( a, b ) => {\n\n\tlet dx = a.x - b.x,\n\t\tdy = a.y - b.y;\n\n\treturn Math.sqrt( dx*dx + dy*dy );\n\n}\n\n/**\n * Applies a CSS transform to the target element.\n *\n * @param {HTMLElement} element\n * @param {string} transform\n */\nexport const transformElement = ( element, transform ) => {\n\n\telement.style.transform = transform;\n\n}\n\n/**\n * Element.matches with IE support.\n *\n * @param {HTMLElement} target The element to match\n * @param {String} selector The CSS selector to match\n * the element against\n *\n * @return {Boolean}\n */\nexport const matches = ( target, selector ) => {\n\n\tlet matchesMethod = target.matches || target.matchesSelector || target.msMatchesSelector;\n\n\treturn !!( matchesMethod && matchesMethod.call( target, selector ) );\n\n}\n\n/**\n * Find the closest parent that matches the given\n * selector.\n *\n * @param {HTMLElement} target The child element\n * @param {String} selector The CSS selector to match\n * the parents against\n *\n * @return {HTMLElement} The matched parent or null\n * if no matching parent was found\n */\nexport const closest = ( target, selector ) => {\n\n\t// Native Element.closest\n\tif( typeof target.closest === 'function' ) {\n\t\treturn target.closest( selector );\n\t}\n\n\t// Polyfill\n\twhile( target ) {\n\t\tif( matches( target, selector ) ) {\n\t\t\treturn target;\n\t\t}\n\n\t\t// Keep searching\n\t\ttarget = target.parentNode;\n\t}\n\n\treturn null;\n\n}\n\n/**\n * Handling the fullscreen functionality via the fullscreen API\n *\n * @see http://fullscreen.spec.whatwg.org/\n * @see https://developer.mozilla.org/en-US/docs/DOM/Using_fullscreen_mode\n */\nexport const enterFullscreen = element => {\n\n\telement = element || document.documentElement;\n\n\t// Check which implementation is available\n\tlet requestMethod = element.requestFullscreen ||\n\t\t\t\t\t\telement.webkitRequestFullscreen ||\n\t\t\t\t\t\telement.webkitRequestFullScreen ||\n\t\t\t\t\t\telement.mozRequestFullScreen ||\n\t\t\t\t\t\telement.msRequestFullscreen;\n\n\tif( requestMethod ) {\n\t\trequestMethod.apply( element );\n\t}\n\n}\n\n/**\n * Creates an HTML element and returns a reference to it.\n * If the element already exists the existing instance will\n * be returned.\n *\n * @param {HTMLElement} container\n * @param {string} tagname\n * @param {string} classname\n * @param {string} innerHTML\n *\n * @return {HTMLElement}\n */\nexport const createSingletonNode = ( container, tagname, classname, innerHTML='' ) => {\n\n\t// Find all nodes matching the description\n\tlet nodes = container.querySelectorAll( '.' + classname );\n\n\t// Check all matches to find one which is a direct child of\n\t// the specified container\n\tfor( let i = 0; i < nodes.length; i++ ) {\n\t\tlet testNode = nodes[i];\n\t\tif( testNode.parentNode === container ) {\n\t\t\treturn testNode;\n\t\t}\n\t}\n\n\t// If no node was found, create it now\n\tlet node = document.createElement( tagname );\n\tnode.className = classname;\n\tnode.innerHTML = innerHTML;\n\tcontainer.appendChild( node );\n\n\treturn node;\n\n}\n\n/**\n * Injects the given CSS styles into the DOM.\n *\n * @param {string} value\n */\nexport const createStyleSheet = ( value ) => {\n\n\tlet tag = document.createElement( 'style' );\n\ttag.type = 'text/css';\n\n\tif( value && value.length > 0 ) {\n\t\tif( tag.styleSheet ) {\n\t\t\ttag.styleSheet.cssText = value;\n\t\t}\n\t\telse {\n\t\t\ttag.appendChild( document.createTextNode( value ) );\n\t\t}\n\t}\n\n\tdocument.head.appendChild( tag );\n\n\treturn tag;\n\n}\n\n/**\n * Returns a key:value hash of all query params.\n */\nexport const getQueryHash = () => {\n\n\tlet query = {};\n\n\tlocation.search.replace( /[A-Z0-9]+?=([\\w\\.%-]*)/gi, a => {\n\t\tquery[ a.split( '=' ).shift() ] = a.split( '=' ).pop();\n\t} );\n\n\t// Basic deserialization\n\tfor( let i in query ) {\n\t\tlet value = query[ i ];\n\n\t\tquery[ i ] = deserialize( unescape( value ) );\n\t}\n\n\t// Do not accept new dependencies via query config to avoid\n\t// the potential of malicious script injection\n\tif( typeof query['dependencies'] !== 'undefined' ) delete query['dependencies'];\n\n\treturn query;\n\n}\n\n/**\n * Returns the remaining height within the parent of the\n * target element.\n *\n * remaining height = [ configured parent height ] - [ current parent height ]\n *\n * @param {HTMLElement} element\n * @param {number} [height]\n */\nexport const getRemainingHeight = ( element, height = 0 ) => {\n\n\tif( element ) {\n\t\tlet newHeight, oldHeight = element.style.height;\n\n\t\t// Change the .stretch element height to 0 in order find the height of all\n\t\t// the other elements\n\t\telement.style.height = '0px';\n\n\t\t// In Overview mode, the parent (.slide) height is set of 700px.\n\t\t// Restore it temporarily to its natural height.\n\t\telement.parentNode.style.height = 'auto';\n\n\t\tnewHeight = height - element.parentNode.offsetHeight;\n\n\t\t// Restore the old height, just in case\n\t\telement.style.height = oldHeight + 'px';\n\n\t\t// Clear the parent (.slide) height. .removeProperty works in IE9+\n\t\telement.parentNode.style.removeProperty('height');\n\n\t\treturn newHeight;\n\t}\n\n\treturn height;\n\n}\n\nconst fileExtensionToMimeMap = {\n\t'mp4': 'video/mp4',\n\t'm4a': 'video/mp4',\n\t'ogv': 'video/ogg',\n\t'mpeg': 'video/mpeg',\n\t'webm': 'video/webm'\n}\n\n/**\n * Guess the MIME type for common file formats.\n */\nexport const getMimeTypeFromFile = ( filename='' ) => {\n\treturn fileExtensionToMimeMap[filename.split('.').pop()]\n}","const UA = navigator.userAgent;\n\nexport const isMobile = /(iphone|ipod|ipad|android)/gi.test( UA ) ||\n\t\t\t\t\t\t( navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1 ); // iPadOS\n\nexport const isChrome = /chrome/i.test( UA ) && !/edge/i.test( UA );\n\nexport const isAndroid = /android/gi.test( UA );","/*\n * fitty v2.3.3 - Snugly resizes text to fit its parent container\n * Copyright (c) 2020 Rik Schennink <rik@pqina.nl> (https://pqina.nl/)\n */\n'use strict';\n\nObject.defineProperty(exports, \"__esModule\", {\n  value: true\n});\n\nvar _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };\n\nexports.default = function (w) {\n\n  // no window, early exit\n  if (!w) return;\n\n  // node list to array helper method\n  var toArray = function toArray(nl) {\n    return [].slice.call(nl);\n  };\n\n  // states\n  var DrawState = {\n    IDLE: 0,\n    DIRTY_CONTENT: 1,\n    DIRTY_LAYOUT: 2,\n    DIRTY: 3\n  };\n\n  // all active fitty elements\n  var fitties = [];\n\n  // group all redraw calls till next frame, we cancel each frame request when a new one comes in. If no support for request animation frame, this is an empty function and supports for fitty stops.\n  var redrawFrame = null;\n  var requestRedraw = 'requestAnimationFrame' in w ? function () {\n    w.cancelAnimationFrame(redrawFrame);\n    redrawFrame = w.requestAnimationFrame(function () {\n      return redraw(fitties.filter(function (f) {\n        return f.dirty && f.active;\n      }));\n    });\n  } : function () {};\n\n  // sets all fitties to dirty so they are redrawn on the next redraw loop, then calls redraw\n  var redrawAll = function redrawAll(type) {\n    return function () {\n      fitties.forEach(function (f) {\n        return f.dirty = type;\n      });\n      requestRedraw();\n    };\n  };\n\n  // redraws fitties so they nicely fit their parent container\n  var redraw = function redraw(fitties) {\n\n    // getting info from the DOM at this point should not trigger a reflow, let's gather as much intel as possible before triggering a reflow\n\n    // check if styles of all fitties have been computed\n    fitties.filter(function (f) {\n      return !f.styleComputed;\n    }).forEach(function (f) {\n      f.styleComputed = computeStyle(f);\n    });\n\n    // restyle elements that require pre-styling, this triggers a reflow, please try to prevent by adding CSS rules (see docs)\n    fitties.filter(shouldPreStyle).forEach(applyStyle);\n\n    // we now determine which fitties should be redrawn\n    var fittiesToRedraw = fitties.filter(shouldRedraw);\n\n    // we calculate final styles for these fitties\n    fittiesToRedraw.forEach(calculateStyles);\n\n    // now we apply the calculated styles from our previous loop\n    fittiesToRedraw.forEach(function (f) {\n      applyStyle(f);\n      markAsClean(f);\n    });\n\n    // now we dispatch events for all restyled fitties\n    fittiesToRedraw.forEach(dispatchFitEvent);\n  };\n\n  var markAsClean = function markAsClean(f) {\n    return f.dirty = DrawState.IDLE;\n  };\n\n  var calculateStyles = function calculateStyles(f) {\n\n    // get available width from parent node\n    f.availableWidth = f.element.parentNode.clientWidth;\n\n    // the space our target element uses\n    f.currentWidth = f.element.scrollWidth;\n\n    // remember current font size\n    f.previousFontSize = f.currentFontSize;\n\n    // let's calculate the new font size\n    f.currentFontSize = Math.min(Math.max(f.minSize, f.availableWidth / f.currentWidth * f.previousFontSize), f.maxSize);\n\n    // if allows wrapping, only wrap when at minimum font size (otherwise would break container)\n    f.whiteSpace = f.multiLine && f.currentFontSize === f.minSize ? 'normal' : 'nowrap';\n  };\n\n  // should always redraw if is not dirty layout, if is dirty layout, only redraw if size has changed\n  var shouldRedraw = function shouldRedraw(f) {\n    return f.dirty !== DrawState.DIRTY_LAYOUT || f.dirty === DrawState.DIRTY_LAYOUT && f.element.parentNode.clientWidth !== f.availableWidth;\n  };\n\n  // every fitty element is tested for invalid styles\n  var computeStyle = function computeStyle(f) {\n\n    // get style properties\n    var style = w.getComputedStyle(f.element, null);\n\n    // get current font size in pixels (if we already calculated it, use the calculated version)\n    f.currentFontSize = parseFloat(style.getPropertyValue('font-size'));\n\n    // get display type and wrap mode\n    f.display = style.getPropertyValue('display');\n    f.whiteSpace = style.getPropertyValue('white-space');\n  };\n\n  // determines if this fitty requires initial styling, can be prevented by applying correct styles through CSS\n  var shouldPreStyle = function shouldPreStyle(f) {\n\n    var preStyle = false;\n\n    // if we already tested for prestyling we don't have to do it again\n    if (f.preStyleTestCompleted) return false;\n\n    // should have an inline style, if not, apply\n    if (!/inline-/.test(f.display)) {\n      preStyle = true;\n      f.display = 'inline-block';\n    }\n\n    // to correctly calculate dimensions the element should have whiteSpace set to nowrap\n    if (f.whiteSpace !== 'nowrap') {\n      preStyle = true;\n      f.whiteSpace = 'nowrap';\n    }\n\n    // we don't have to do this twice\n    f.preStyleTestCompleted = true;\n\n    return preStyle;\n  };\n\n  // apply styles to single fitty\n  var applyStyle = function applyStyle(f) {\n    f.element.style.whiteSpace = f.whiteSpace;\n    f.element.style.display = f.display;\n    f.element.style.fontSize = f.currentFontSize + 'px';\n  };\n\n  // dispatch a fit event on a fitty\n  var dispatchFitEvent = function dispatchFitEvent(f) {\n    f.element.dispatchEvent(new CustomEvent('fit', {\n      detail: {\n        oldValue: f.previousFontSize,\n        newValue: f.currentFontSize,\n        scaleFactor: f.currentFontSize / f.previousFontSize\n      }\n    }));\n  };\n\n  // fit method, marks the fitty as dirty and requests a redraw (this will also redraw any other fitty marked as dirty)\n  var fit = function fit(f, type) {\n    return function () {\n      f.dirty = type;\n      if (!f.active) return;\n      requestRedraw();\n    };\n  };\n\n  var init = function init(f) {\n\n    // save some of the original CSS properties before we change them\n    f.originalStyle = {\n      whiteSpace: f.element.style.whiteSpace,\n      display: f.element.style.display,\n      fontSize: f.element.style.fontSize\n    };\n\n    // should we observe DOM mutations\n    observeMutations(f);\n\n    // this is a new fitty so we need to validate if it's styles are in order\n    f.newbie = true;\n\n    // because it's a new fitty it should also be dirty, we want it to redraw on the first loop\n    f.dirty = true;\n\n    // we want to be able to update this fitty\n    fitties.push(f);\n  };\n\n  var destroy = function destroy(f) {\n    return function () {\n\n      // remove from fitties array\n      fitties = fitties.filter(function (_) {\n        return _.element !== f.element;\n      });\n\n      // stop observing DOM\n      if (f.observeMutations) f.observer.disconnect();\n\n      // reset the CSS properties we changes\n      f.element.style.whiteSpace = f.originalStyle.whiteSpace;\n      f.element.style.display = f.originalStyle.display;\n      f.element.style.fontSize = f.originalStyle.fontSize;\n    };\n  };\n\n  // add a new fitty, does not redraw said fitty\n  var subscribe = function subscribe(f) {\n    return function () {\n      if (f.active) return;\n      f.active = true;\n      requestRedraw();\n    };\n  };\n\n  // remove an existing fitty\n  var unsubscribe = function unsubscribe(f) {\n    return function () {\n      return f.active = false;\n    };\n  };\n\n  var observeMutations = function observeMutations(f) {\n\n    // no observing?\n    if (!f.observeMutations) return;\n\n    // start observing mutations\n    f.observer = new MutationObserver(fit(f, DrawState.DIRTY_CONTENT));\n\n    // start observing\n    f.observer.observe(f.element, f.observeMutations);\n  };\n\n  // default mutation observer settings\n  var mutationObserverDefaultSetting = {\n    subtree: true,\n    childList: true,\n    characterData: true\n  };\n\n  // default fitty options\n  var defaultOptions = {\n    minSize: 16,\n    maxSize: 512,\n    multiLine: true,\n    observeMutations: 'MutationObserver' in w ? mutationObserverDefaultSetting : false\n  };\n\n  // array of elements in, fitty instances out\n  function fittyCreate(elements, options) {\n\n    // set options object\n    var fittyOptions = _extends({}, defaultOptions, options);\n\n    // create fitties\n    var publicFitties = elements.map(function (element) {\n\n      // create fitty instance\n      var f = _extends({}, fittyOptions, {\n\n        // internal options for this fitty\n        element: element,\n        active: true\n      });\n\n      // initialise this fitty\n      init(f);\n\n      // expose API\n      return {\n        element: element,\n        fit: fit(f, DrawState.DIRTY),\n        unfreeze: subscribe(f),\n        freeze: unsubscribe(f),\n        unsubscribe: destroy(f)\n      };\n    });\n\n    // call redraw on newly initiated fitties\n    requestRedraw();\n\n    // expose fitties\n    return publicFitties;\n  }\n\n  // fitty creation function\n  function fitty(target) {\n    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n\n\n    // if target is a string\n    return typeof target === 'string' ?\n\n    // treat it as a querySelector\n    fittyCreate(toArray(document.querySelectorAll(target)), options) :\n\n    // create single fitty\n    fittyCreate([target], options)[0];\n  }\n\n  // handles viewport changes, redraws all fitties, but only does so after a timeout\n  var resizeDebounce = null;\n  var onWindowResized = function onWindowResized() {\n    w.clearTimeout(resizeDebounce);\n    resizeDebounce = w.setTimeout(redrawAll(DrawState.DIRTY_LAYOUT), fitty.observeWindowDelay);\n  };\n\n  // define observe window property, so when we set it to true or false events are automatically added and removed\n  var events = ['resize', 'orientationchange'];\n  Object.defineProperty(fitty, 'observeWindow', {\n    set: function set(enabled) {\n      var method = (enabled ? 'add' : 'remove') + 'EventListener';\n      events.forEach(function (e) {\n        w[method](e, onWindowResized);\n      });\n    }\n  });\n\n  // fitty global properties (by setting observeWindow to true the events above get added)\n  fitty.observeWindow = true;\n  fitty.observeWindowDelay = 100;\n\n  // public fit all method, will force redraw no matter what\n  fitty.fitAll = redrawAll(DrawState.DIRTY);\n\n  // export our fitty function, we don't want to keep it to our selves\n  return fitty;\n}(typeof window === 'undefined' ? null : window);","import { extend, queryAll, closest, getMimeTypeFromFile } from '../utils/util.js'\nimport { isMobile } from '../utils/device.js'\n\nimport fitty from 'fitty';\n\n/**\n * Handles loading, unloading and playback of slide\n * content such as images, videos and iframes.\n */\nexport default class SlideContent {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.startEmbeddedIframe = this.startEmbeddedIframe.bind( this );\n\n\t}\n\n\t/**\n\t * Should the given element be preloaded?\n\t * Decides based on local element attributes and global config.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tshouldPreload( element ) {\n\n\t\t// Prefer an explicit global preload setting\n\t\tlet preload = this.Reveal.getConfig().preloadIframes;\n\n\t\t// If no global setting is available, fall back on the element's\n\t\t// own preload setting\n\t\tif( typeof preload !== 'boolean' ) {\n\t\t\tpreload = element.hasAttribute( 'data-preload' );\n\t\t}\n\n\t\treturn preload;\n\t}\n\n\t/**\n\t * Called when the given slide is within the configured view\n\t * distance. Shows the slide element and loads any content\n\t * that is set to load lazily (data-src).\n\t *\n\t * @param {HTMLElement} slide Slide to show\n\t */\n\tload( slide, options = {} ) {\n\n\t\t// Show the slide element\n\t\tslide.style.display = this.Reveal.getConfig().display;\n\n\t\t// Media elements with data-src attributes\n\t\tqueryAll( slide, 'img[data-src], video[data-src], audio[data-src], iframe[data-src]' ).forEach( element => {\n\t\t\tif( element.tagName !== 'IFRAME' || this.shouldPreload( element ) ) {\n\t\t\t\telement.setAttribute( 'src', element.getAttribute( 'data-src' ) );\n\t\t\t\telement.setAttribute( 'data-lazy-loaded', '' );\n\t\t\t\telement.removeAttribute( 'data-src' );\n\t\t\t}\n\t\t} );\n\n\t\t// Media elements with <source> children\n\t\tqueryAll( slide, 'video, audio' ).forEach( media => {\n\t\t\tlet sources = 0;\n\n\t\t\tqueryAll( media, 'source[data-src]' ).forEach( source => {\n\t\t\t\tsource.setAttribute( 'src', source.getAttribute( 'data-src' ) );\n\t\t\t\tsource.removeAttribute( 'data-src' );\n\t\t\t\tsource.setAttribute( 'data-lazy-loaded', '' );\n\t\t\t\tsources += 1;\n\t\t\t} );\n\n\t\t\t// Enable inline video playback in mobile Safari\n\t\t\tif( isMobile && media.tagName === 'VIDEO' ) {\n\t\t\t\tmedia.setAttribute( 'playsinline', '' );\n\t\t\t}\n\n\t\t\t// If we rewrote sources for this video/audio element, we need\n\t\t\t// to manually tell it to load from its new origin\n\t\t\tif( sources > 0 ) {\n\t\t\t\tmedia.load();\n\t\t\t}\n\t\t} );\n\n\n\t\t// Show the corresponding background element\n\t\tlet background = slide.slideBackgroundElement;\n\t\tif( background ) {\n\t\t\tbackground.style.display = 'block';\n\n\t\t\tlet backgroundContent = slide.slideBackgroundContentElement;\n\t\t\tlet backgroundIframe = slide.getAttribute( 'data-background-iframe' );\n\n\t\t\t// If the background contains media, load it\n\t\t\tif( background.hasAttribute( 'data-loaded' ) === false ) {\n\t\t\t\tbackground.setAttribute( 'data-loaded', 'true' );\n\n\t\t\t\tlet backgroundImage = slide.getAttribute( 'data-background-image' ),\n\t\t\t\t\tbackgroundVideo = slide.getAttribute( 'data-background-video' ),\n\t\t\t\t\tbackgroundVideoLoop = slide.hasAttribute( 'data-background-video-loop' ),\n\t\t\t\t\tbackgroundVideoMuted = slide.hasAttribute( 'data-background-video-muted' );\n\n\t\t\t\t// Images\n\t\t\t\tif( backgroundImage ) {\n\t\t\t\t\t// base64\n\t\t\t\t\tif(  /^data:/.test( backgroundImage.trim() ) ) {\n\t\t\t\t\t\tbackgroundContent.style.backgroundImage = `url(${backgroundImage.trim()})`;\n\t\t\t\t\t}\n\t\t\t\t\t// URL(s)\n\t\t\t\t\telse {\n\t\t\t\t\t\tbackgroundContent.style.backgroundImage = backgroundImage.split( ',' ).map( background => {\n\t\t\t\t\t\t\treturn `url(${encodeURI(background.trim())})`;\n\t\t\t\t\t\t}).join( ',' );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Videos\n\t\t\t\telse if ( backgroundVideo && !this.Reveal.isSpeakerNotes() ) {\n\t\t\t\t\tlet video = document.createElement( 'video' );\n\n\t\t\t\t\tif( backgroundVideoLoop ) {\n\t\t\t\t\t\tvideo.setAttribute( 'loop', '' );\n\t\t\t\t\t}\n\n\t\t\t\t\tif( backgroundVideoMuted ) {\n\t\t\t\t\t\tvideo.muted = true;\n\t\t\t\t\t}\n\n\t\t\t\t\t// Enable inline playback in mobile Safari\n\t\t\t\t\t//\n\t\t\t\t\t// Mute is required for video to play when using\n\t\t\t\t\t// swipe gestures to navigate since they don't\n\t\t\t\t\t// count as direct user actions :'(\n\t\t\t\t\tif( isMobile ) {\n\t\t\t\t\t\tvideo.muted = true;\n\t\t\t\t\t\tvideo.setAttribute( 'playsinline', '' );\n\t\t\t\t\t}\n\n\t\t\t\t\t// Support comma separated lists of video sources\n\t\t\t\t\tbackgroundVideo.split( ',' ).forEach( source => {\n\t\t\t\t\t\tlet type = getMimeTypeFromFile( source );\n\t\t\t\t\t\tif( type ) {\n\t\t\t\t\t\t\tvideo.innerHTML += `<source src=\"${source}\" type=\"${type}\">`;\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tvideo.innerHTML += `<source src=\"${source}\">`;\n\t\t\t\t\t\t}\n\t\t\t\t\t} );\n\n\t\t\t\t\tbackgroundContent.appendChild( video );\n\t\t\t\t}\n\t\t\t\t// Iframes\n\t\t\t\telse if( backgroundIframe && options.excludeIframes !== true ) {\n\t\t\t\t\tlet iframe = document.createElement( 'iframe' );\n\t\t\t\t\tiframe.setAttribute( 'allowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'mozallowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'webkitallowfullscreen', '' );\n\t\t\t\t\tiframe.setAttribute( 'allow', 'autoplay' );\n\n\t\t\t\t\tiframe.setAttribute( 'data-src', backgroundIframe );\n\n\t\t\t\t\tiframe.style.width  = '100%';\n\t\t\t\t\tiframe.style.height = '100%';\n\t\t\t\t\tiframe.style.maxHeight = '100%';\n\t\t\t\t\tiframe.style.maxWidth = '100%';\n\n\t\t\t\t\tbackgroundContent.appendChild( iframe );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Start loading preloadable iframes\n\t\t\tlet backgroundIframeElement = backgroundContent.querySelector( 'iframe[data-src]' );\n\t\t\tif( backgroundIframeElement ) {\n\n\t\t\t\t// Check if this iframe is eligible to be preloaded\n\t\t\t\tif( this.shouldPreload( background ) && !/autoplay=(1|true|yes)/gi.test( backgroundIframe ) ) {\n\t\t\t\t\tif( backgroundIframeElement.getAttribute( 'src' ) !== backgroundIframe ) {\n\t\t\t\t\t\tbackgroundIframeElement.setAttribute( 'src', backgroundIframe );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\tthis.layout( slide );\n\n\t}\n\n\t/**\n\t * Applies JS-dependent layout helpers for the scope.\n\t */\n\tlayout( scopeElement ) {\n\n\t\t// Autosize text with the r-fit-text class based on the\n\t\t// size of its container. This needs to happen after the\n\t\t// slide is visible in order to measure the text.\n\t\tArray.from( scopeElement.querySelectorAll( '.r-fit-text' ) ).forEach( element => {\n\t\t\tfitty( element, {\n\t\t\t\tminSize: 24,\n\t\t\t\tmaxSize: this.Reveal.getConfig().height * 0.8,\n\t\t\t\tobserveMutations: false,\n\t\t\t\tobserveWindow: false\n\t\t\t} );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Unloads and hides the given slide. This is called when the\n\t * slide is moved outside of the configured view distance.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tunload( slide ) {\n\n\t\t// Hide the slide element\n\t\tslide.style.display = 'none';\n\n\t\t// Hide the corresponding background element\n\t\tlet background = this.Reveal.getSlideBackground( slide );\n\t\tif( background ) {\n\t\t\tbackground.style.display = 'none';\n\n\t\t\t// Unload any background iframes\n\t\t\tqueryAll( background, 'iframe[src]' ).forEach( element => {\n\t\t\t\telement.removeAttribute( 'src' );\n\t\t\t} );\n\t\t}\n\n\t\t// Reset lazy-loaded media elements with src attributes\n\t\tqueryAll( slide, 'video[data-lazy-loaded][src], audio[data-lazy-loaded][src], iframe[data-lazy-loaded][src]' ).forEach( element => {\n\t\t\telement.setAttribute( 'data-src', element.getAttribute( 'src' ) );\n\t\t\telement.removeAttribute( 'src' );\n\t\t} );\n\n\t\t// Reset lazy-loaded media elements with <source> children\n\t\tqueryAll( slide, 'video[data-lazy-loaded] source[src], audio source[src]' ).forEach( source => {\n\t\t\tsource.setAttribute( 'data-src', source.getAttribute( 'src' ) );\n\t\t\tsource.removeAttribute( 'src' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Enforces origin-specific format rules for embedded media.\n\t */\n\tformatEmbeddedContent() {\n\n\t\tlet _appendParamToIframeSource = ( sourceAttribute, sourceURL, param ) => {\n\t\t\tqueryAll( this.Reveal.getSlidesElement(), 'iframe['+ sourceAttribute +'*=\"'+ sourceURL +'\"]' ).forEach( el => {\n\t\t\t\tlet src = el.getAttribute( sourceAttribute );\n\t\t\t\tif( src && src.indexOf( param ) === -1 ) {\n\t\t\t\t\tel.setAttribute( sourceAttribute, src + ( !/\\?/.test( src ) ? '?' : '&' ) + param );\n\t\t\t\t}\n\t\t\t});\n\t\t};\n\n\t\t// YouTube frames must include \"?enablejsapi=1\"\n\t\t_appendParamToIframeSource( 'src', 'youtube.com/embed/', 'enablejsapi=1' );\n\t\t_appendParamToIframeSource( 'data-src', 'youtube.com/embed/', 'enablejsapi=1' );\n\n\t\t// Vimeo frames must include \"?api=1\"\n\t\t_appendParamToIframeSource( 'src', 'player.vimeo.com/', 'api=1' );\n\t\t_appendParamToIframeSource( 'data-src', 'player.vimeo.com/', 'api=1' );\n\n\t}\n\n\t/**\n\t * Start playback of any embedded content inside of\n\t * the given element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tstartEmbeddedContent( element ) {\n\n\t\tif( element && !this.Reveal.isSpeakerNotes() ) {\n\n\t\t\t// Restart GIFs\n\t\t\tqueryAll( element, 'img[src$=\".gif\"]' ).forEach( el => {\n\t\t\t\t// Setting the same unchanged source like this was confirmed\n\t\t\t\t// to work in Chrome, FF & Safari\n\t\t\t\tel.setAttribute( 'src', el.getAttribute( 'src' ) );\n\t\t\t} );\n\n\t\t\t// HTML5 media elements\n\t\t\tqueryAll( element, 'video, audio' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\t// Prefer an explicit global autoplay setting\n\t\t\t\tlet autoplay = this.Reveal.getConfig().autoPlayMedia;\n\n\t\t\t\t// If no global setting is available, fall back on the element's\n\t\t\t\t// own autoplay setting\n\t\t\t\tif( typeof autoplay !== 'boolean' ) {\n\t\t\t\t\tautoplay = el.hasAttribute( 'data-autoplay' ) || !!closest( el, '.slide-background' );\n\t\t\t\t}\n\n\t\t\t\tif( autoplay && typeof el.play === 'function' ) {\n\n\t\t\t\t\t// If the media is ready, start playback\n\t\t\t\t\tif( el.readyState > 1 ) {\n\t\t\t\t\t\tthis.startEmbeddedMedia( { target: el } );\n\t\t\t\t\t}\n\t\t\t\t\t// Mobile devices never fire a loaded event so instead\n\t\t\t\t\t// of waiting, we initiate playback\n\t\t\t\t\telse if( isMobile ) {\n\t\t\t\t\t\tlet promise = el.play();\n\n\t\t\t\t\t\t// If autoplay does not work, ensure that the controls are visible so\n\t\t\t\t\t\t// that the viewer can start the media on their own\n\t\t\t\t\t\tif( promise && typeof promise.catch === 'function' && el.controls === false ) {\n\t\t\t\t\t\t\tpromise.catch( () => {\n\t\t\t\t\t\t\t\tel.controls = true;\n\n\t\t\t\t\t\t\t\t// Once the video does start playing, hide the controls again\n\t\t\t\t\t\t\t\tel.addEventListener( 'play', () => {\n\t\t\t\t\t\t\t\t\tel.controls = false;\n\t\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\t// If the media isn't loaded, wait before playing\n\t\t\t\t\telse {\n\t\t\t\t\t\tel.removeEventListener( 'loadeddata', this.startEmbeddedMedia ); // remove first to avoid dupes\n\t\t\t\t\t\tel.addEventListener( 'loadeddata', this.startEmbeddedMedia );\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Normal iframes\n\t\t\tqueryAll( element, 'iframe[src]' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tthis.startEmbeddedIframe( { target: el } );\n\t\t\t} );\n\n\t\t\t// Lazy loading iframes\n\t\t\tqueryAll( element, 'iframe[data-src]' ).forEach( el => {\n\t\t\t\tif( closest( el, '.fragment' ) && !closest( el, '.fragment.visible' ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tif( el.getAttribute( 'src' ) !== el.getAttribute( 'data-src' ) ) {\n\t\t\t\t\tel.removeEventListener( 'load', this.startEmbeddedIframe ); // remove first to avoid dupes\n\t\t\t\t\tel.addEventListener( 'load', this.startEmbeddedIframe );\n\t\t\t\t\tel.setAttribute( 'src', el.getAttribute( 'data-src' ) );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Starts playing an embedded video/audio element after\n\t * it has finished loading.\n\t *\n\t * @param {object} event\n\t */\n\tstartEmbeddedMedia( event ) {\n\n\t\tlet isAttachedToDOM = !!closest( event.target, 'html' ),\n\t\t\tisVisible  \t\t= !!closest( event.target, '.present' );\n\n\t\tif( isAttachedToDOM && isVisible ) {\n\t\t\tevent.target.currentTime = 0;\n\t\t\tevent.target.play();\n\t\t}\n\n\t\tevent.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );\n\n\t}\n\n\t/**\n\t * \"Starts\" the content of an embedded iframe using the\n\t * postMessage API.\n\t *\n\t * @param {object} event\n\t */\n\tstartEmbeddedIframe( event ) {\n\n\t\tlet iframe = event.target;\n\n\t\tif( iframe && iframe.contentWindow ) {\n\n\t\t\tlet isAttachedToDOM = !!closest( event.target, 'html' ),\n\t\t\t\tisVisible  \t\t= !!closest( event.target, '.present' );\n\n\t\t\tif( isAttachedToDOM && isVisible ) {\n\n\t\t\t\t// Prefer an explicit global autoplay setting\n\t\t\t\tlet autoplay = this.Reveal.getConfig().autoPlayMedia;\n\n\t\t\t\t// If no global setting is available, fall back on the element's\n\t\t\t\t// own autoplay setting\n\t\t\t\tif( typeof autoplay !== 'boolean' ) {\n\t\t\t\t\tautoplay = iframe.hasAttribute( 'data-autoplay' ) || !!closest( iframe, '.slide-background' );\n\t\t\t\t}\n\n\t\t\t\t// YouTube postMessage API\n\t\t\t\tif( /youtube\\.com\\/embed\\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {\n\t\t\t\t\tiframe.contentWindow.postMessage( '{\"event\":\"command\",\"func\":\"playVideo\",\"args\":\"\"}', '*' );\n\t\t\t\t}\n\t\t\t\t// Vimeo postMessage API\n\t\t\t\telse if( /player\\.vimeo\\.com\\//.test( iframe.getAttribute( 'src' ) ) && autoplay ) {\n\t\t\t\t\tiframe.contentWindow.postMessage( '{\"method\":\"play\"}', '*' );\n\t\t\t\t}\n\t\t\t\t// Generic postMessage API\n\t\t\t\telse {\n\t\t\t\t\tiframe.contentWindow.postMessage( 'slide:start', '*' );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Stop playback of any embedded content inside of\n\t * the targeted slide.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tstopEmbeddedContent( element, options = {} ) {\n\n\t\toptions = extend( {\n\t\t\t// Defaults\n\t\t\tunloadIframes: true\n\t\t}, options );\n\n\t\tif( element && element.parentNode ) {\n\t\t\t// HTML5 media elements\n\t\t\tqueryAll( element, 'video, audio' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && typeof el.pause === 'function' ) {\n\t\t\t\t\tel.setAttribute('data-paused-by-reveal', '');\n\t\t\t\t\tel.pause();\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Generic postMessage API for non-lazy loaded iframes\n\t\t\tqueryAll( element, 'iframe' ).forEach( el => {\n\t\t\t\tif( el.contentWindow ) el.contentWindow.postMessage( 'slide:stop', '*' );\n\t\t\t\tel.removeEventListener( 'load', this.startEmbeddedIframe );\n\t\t\t});\n\n\t\t\t// YouTube postMessage API\n\t\t\tqueryAll( element, 'iframe[src*=\"youtube.com/embed/\"]' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {\n\t\t\t\t\tel.contentWindow.postMessage( '{\"event\":\"command\",\"func\":\"pauseVideo\",\"args\":\"\"}', '*' );\n\t\t\t\t}\n\t\t\t});\n\n\t\t\t// Vimeo postMessage API\n\t\t\tqueryAll( element, 'iframe[src*=\"player.vimeo.com/\"]' ).forEach( el => {\n\t\t\t\tif( !el.hasAttribute( 'data-ignore' ) && el.contentWindow && typeof el.contentWindow.postMessage === 'function' ) {\n\t\t\t\t\tel.contentWindow.postMessage( '{\"method\":\"pause\"}', '*' );\n\t\t\t\t}\n\t\t\t});\n\n\t\t\tif( options.unloadIframes === true ) {\n\t\t\t\t// Unload lazy-loaded iframes\n\t\t\t\tqueryAll( element, 'iframe[data-src]' ).forEach( el => {\n\t\t\t\t\t// Only removing the src doesn't actually unload the frame\n\t\t\t\t\t// in all browsers (Firefox) so we set it to blank first\n\t\t\t\t\tel.setAttribute( 'src', 'about:blank' );\n\t\t\t\t\tel.removeAttribute( 'src' );\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t}\n\n}\n","/**\n * Handles the display of reveal.js' optional slide number.\n */\nexport default class SlideNumber {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'slide-number';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tlet slideNumberDisplay = 'none';\n\t\tif( config.slideNumber && !this.Reveal.isPrintingPDF() ) {\n\t\t\tif( config.showSlideNumber === 'all' ) {\n\t\t\t\tslideNumberDisplay = 'block';\n\t\t\t}\n\t\t\telse if( config.showSlideNumber === 'speaker' && this.Reveal.isSpeakerNotes() ) {\n\t\t\t\tslideNumberDisplay = 'block';\n\t\t\t}\n\t\t}\n\n\t\tthis.element.style.display = slideNumberDisplay;\n\n\t}\n\n\t/**\n\t * Updates the slide number to match the current slide.\n\t */\n\tupdate() {\n\n\t\t// Update slide number if enabled\n\t\tif( this.Reveal.getConfig().slideNumber && this.element ) {\n\t\t\tthis.element.innerHTML = this.getSlideNumber();\n\t\t}\n\n\t}\n\n\t/**\n\t * Returns the HTML string corresponding to the current slide\n\t * number, including formatting.\n\t */\n\tgetSlideNumber( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\t\tlet value;\n\t\tlet format = 'h.v';\n\n\t\tif ( typeof config.slideNumber === 'function' ) {\n\t\t\tvalue = config.slideNumber( slide );\n\t\t} else {\n\t\t\t// Check if a custom number format is available\n\t\t\tif( typeof config.slideNumber === 'string' ) {\n\t\t\t\tformat = config.slideNumber;\n\t\t\t}\n\n\t\t\t// If there are ONLY vertical slides in this deck, always use\n\t\t\t// a flattened slide number\n\t\t\tif( !/c/.test( format ) && this.Reveal.getHorizontalSlides().length === 1 ) {\n\t\t\t\tformat = 'c';\n\t\t\t}\n\n\t\t\t// Offset the current slide number by 1 to make it 1-indexed\n\t\t\tlet horizontalOffset = slide && slide.dataset.visibility === 'uncounted' ? 0 : 1;\n\n\t\t\tvalue = [];\n\t\t\tswitch( format ) {\n\t\t\t\tcase 'c':\n\t\t\t\t\tvalue.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset );\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'c/t':\n\t\t\t\t\tvalue.push( this.Reveal.getSlidePastCount( slide ) + horizontalOffset, '/', this.Reveal.getTotalSlides() );\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tlet indices = this.Reveal.getIndices( slide );\n\t\t\t\t\tvalue.push( indices.h + horizontalOffset );\n\t\t\t\t\tlet sep = format === 'h/v' ? '/' : '.';\n\t\t\t\t\tif( this.Reveal.isVerticalSlide( slide ) ) value.push( sep, indices.v + 1 );\n\t\t\t}\n\t\t}\n\n\t\tlet url = '#' + this.Reveal.location.getHash( slide );\n\t\treturn this.formatNumber( value[0], value[1], value[2], url );\n\n\t}\n\n\t/**\n\t * Applies HTML formatting to a slide number before it's\n\t * written to the DOM.\n\t *\n\t * @param {number} a Current slide\n\t * @param {string} delimiter Character to separate slide numbers\n\t * @param {(number|*)} b Total slides\n\t * @param {HTMLElement} [url='#'+locationHash()] The url to link to\n\t * @return {string} HTML string fragment\n\t */\n\tformatNumber( a, delimiter, b, url = '#' + this.Reveal.location.getHash() ) {\n\n\t\tif( typeof b === 'number' && !isNaN( b ) ) {\n\t\t\treturn  `<a href=\"${url}\">\n\t\t\t\t\t<span class=\"slide-number-a\">${a}</span>\n\t\t\t\t\t<span class=\"slide-number-delimiter\">${delimiter}</span>\n\t\t\t\t\t<span class=\"slide-number-b\">${b}</span>\n\t\t\t\t\t</a>`;\n\t\t}\n\t\telse {\n\t\t\treturn `<a href=\"${url}\">\n\t\t\t\t\t<span class=\"slide-number-a\">${a}</span>\n\t\t\t\t\t</a>`;\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","'use strict';\nvar $ = require('../internals/export');\nvar isObject = require('../internals/is-object');\nvar isArray = require('../internals/is-array');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\nvar toLength = require('../internals/to-length');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar createProperty = require('../internals/create-property');\nvar wellKnownSymbol = require('../internals/well-known-symbol');\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('slice');\n\nvar SPECIES = wellKnownSymbol('species');\nvar nativeSlice = [].slice;\nvar max = Math.max;\n\n// `Array.prototype.slice` method\n// https://tc39.es/ecma262/#sec-array.prototype.slice\n// fallback for not array-like ES3 strings and DOM objects\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {\n  slice: function slice(start, end) {\n    var O = toIndexedObject(this);\n    var length = toLength(O.length);\n    var k = toAbsoluteIndex(start, length);\n    var fin = toAbsoluteIndex(end === undefined ? length : end, length);\n    // inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible\n    var Constructor, result, n;\n    if (isArray(O)) {\n      Constructor = O.constructor;\n      // cross-realm fallback\n      if (typeof Constructor == 'function' && (Constructor === Array || isArray(Constructor.prototype))) {\n        Constructor = undefined;\n      } else if (isObject(Constructor)) {\n        Constructor = Constructor[SPECIES];\n        if (Constructor === null) Constructor = undefined;\n      }\n      if (Constructor === Array || Constructor === undefined) {\n        return nativeSlice.call(O, k, fin);\n      }\n    }\n    result = new (Constructor === undefined ? Array : Constructor)(max(fin - k, 0));\n    for (n = 0; k < fin; k++, n++) if (k in O) createProperty(result, n, O[k]);\n    result.length = n;\n    return result;\n  }\n});\n","/**\n * Converts various color input formats to an {r:0,g:0,b:0} object.\n *\n * @param {string} color The string representation of a color\n * @example\n * colorToRgb('#000');\n * @example\n * colorToRgb('#000000');\n * @example\n * colorToRgb('rgb(0,0,0)');\n * @example\n * colorToRgb('rgba(0,0,0)');\n *\n * @return {{r: number, g: number, b: number, [a]: number}|null}\n */\nexport const colorToRgb = ( color ) => {\n\n\tlet hex3 = color.match( /^#([0-9a-f]{3})$/i );\n\tif( hex3 && hex3[1] ) {\n\t\thex3 = hex3[1];\n\t\treturn {\n\t\t\tr: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,\n\t\t\tg: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,\n\t\t\tb: parseInt( hex3.charAt( 2 ), 16 ) * 0x11\n\t\t};\n\t}\n\n\tlet hex6 = color.match( /^#([0-9a-f]{6})$/i );\n\tif( hex6 && hex6[1] ) {\n\t\thex6 = hex6[1];\n\t\treturn {\n\t\t\tr: parseInt( hex6.slice( 0, 2 ), 16 ),\n\t\t\tg: parseInt( hex6.slice( 2, 4 ), 16 ),\n\t\t\tb: parseInt( hex6.slice( 4, 6 ), 16 )\n\t\t};\n\t}\n\n\tlet rgb = color.match( /^rgb\\s*\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\)$/i );\n\tif( rgb ) {\n\t\treturn {\n\t\t\tr: parseInt( rgb[1], 10 ),\n\t\t\tg: parseInt( rgb[2], 10 ),\n\t\t\tb: parseInt( rgb[3], 10 )\n\t\t};\n\t}\n\n\tlet rgba = color.match( /^rgba\\s*\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\,\\s*([\\d]+|[\\d]*.[\\d]+)\\s*\\)$/i );\n\tif( rgba ) {\n\t\treturn {\n\t\t\tr: parseInt( rgba[1], 10 ),\n\t\t\tg: parseInt( rgba[2], 10 ),\n\t\t\tb: parseInt( rgba[3], 10 ),\n\t\t\ta: parseFloat( rgba[4] )\n\t\t};\n\t}\n\n\treturn null;\n\n}\n\n/**\n * Calculates brightness on a scale of 0-255.\n *\n * @param {string} color See colorToRgb for supported formats.\n * @see {@link colorToRgb}\n */\nexport const colorBrightness = ( color ) => {\n\n\tif( typeof color === 'string' ) color = colorToRgb( color );\n\n\tif( color ) {\n\t\treturn ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;\n\t}\n\n\treturn null;\n\n}","import { queryAll } from '../utils/util.js'\nimport { colorToRgb, colorBrightness } from '../utils/color.js'\n\n/**\n * Creates and updates slide backgrounds.\n */\nexport default class Backgrounds {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'backgrounds';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Creates the slide background elements and appends them\n\t * to the background container. One element is created per\n\t * slide no matter if the given slide has visible background.\n\t */\n\tcreate() {\n\n\t\t// Clear prior backgrounds\n\t\tthis.element.innerHTML = '';\n\t\tthis.element.classList.add( 'no-transition' );\n\n\t\t// Iterate over all horizontal slides\n\t\tthis.Reveal.getHorizontalSlides().forEach( slideh => {\n\n\t\t\tlet backgroundStack = this.createBackground( slideh, this.element );\n\n\t\t\t// Iterate over all vertical slides\n\t\t\tqueryAll( slideh, 'section' ).forEach( slidev => {\n\n\t\t\t\tthis.createBackground( slidev, backgroundStack );\n\n\t\t\t\tbackgroundStack.classList.add( 'stack' );\n\n\t\t\t} );\n\n\t\t} );\n\n\t\t// Add parallax background if specified\n\t\tif( this.Reveal.getConfig().parallaxBackgroundImage ) {\n\n\t\t\tthis.element.style.backgroundImage = 'url(\"' + this.Reveal.getConfig().parallaxBackgroundImage + '\")';\n\t\t\tthis.element.style.backgroundSize = this.Reveal.getConfig().parallaxBackgroundSize;\n\t\t\tthis.element.style.backgroundRepeat = this.Reveal.getConfig().parallaxBackgroundRepeat;\n\t\t\tthis.element.style.backgroundPosition = this.Reveal.getConfig().parallaxBackgroundPosition;\n\n\t\t\t// Make sure the below properties are set on the element - these properties are\n\t\t\t// needed for proper transitions to be set on the element via CSS. To remove\n\t\t\t// annoying background slide-in effect when the presentation starts, apply\n\t\t\t// these properties after short time delay\n\t\t\tsetTimeout( () => {\n\t\t\t\tthis.Reveal.getRevealElement().classList.add( 'has-parallax-background' );\n\t\t\t}, 1 );\n\n\t\t}\n\t\telse {\n\n\t\t\tthis.element.style.backgroundImage = '';\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'has-parallax-background' );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Creates a background for the given slide.\n\t *\n\t * @param {HTMLElement} slide\n\t * @param {HTMLElement} container The element that the background\n\t * should be appended to\n\t * @return {HTMLElement} New background div\n\t */\n\tcreateBackground( slide, container ) {\n\n\t\t// Main slide background element\n\t\tlet element = document.createElement( 'div' );\n\t\telement.className = 'slide-background ' + slide.className.replace( /present|past|future/, '' );\n\n\t\t// Inner background element that wraps images/videos/iframes\n\t\tlet contentElement = document.createElement( 'div' );\n\t\tcontentElement.className = 'slide-background-content';\n\n\t\telement.appendChild( contentElement );\n\t\tcontainer.appendChild( element );\n\n\t\tslide.slideBackgroundElement = element;\n\t\tslide.slideBackgroundContentElement = contentElement;\n\n\t\t// Syncs the background to reflect all current background settings\n\t\tthis.sync( slide );\n\n\t\treturn element;\n\n\t}\n\n\t/**\n\t * Renders all of the visual properties of a slide background\n\t * based on the various background attributes.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tsync( slide ) {\n\n\t\tconst element = slide.slideBackgroundElement,\n\t\t\tcontentElement = slide.slideBackgroundContentElement;\n\n\t\tconst data = {\n\t\t\tbackground: slide.getAttribute( 'data-background' ),\n\t\t\tbackgroundSize: slide.getAttribute( 'data-background-size' ),\n\t\t\tbackgroundImage: slide.getAttribute( 'data-background-image' ),\n\t\t\tbackgroundVideo: slide.getAttribute( 'data-background-video' ),\n\t\t\tbackgroundIframe: slide.getAttribute( 'data-background-iframe' ),\n\t\t\tbackgroundColor: slide.getAttribute( 'data-background-color' ),\n\t\t\tbackgroundGradient: slide.getAttribute( 'data-background-gradient' ),\n\t\t\tbackgroundRepeat: slide.getAttribute( 'data-background-repeat' ),\n\t\t\tbackgroundPosition: slide.getAttribute( 'data-background-position' ),\n\t\t\tbackgroundTransition: slide.getAttribute( 'data-background-transition' ),\n\t\t\tbackgroundOpacity: slide.getAttribute( 'data-background-opacity' ),\n\t\t};\n\n\t\tconst dataPreload = slide.hasAttribute( 'data-preload' );\n\n\t\t// Reset the prior background state in case this is not the\n\t\t// initial sync\n\t\tslide.classList.remove( 'has-dark-background' );\n\t\tslide.classList.remove( 'has-light-background' );\n\n\t\telement.removeAttribute( 'data-loaded' );\n\t\telement.removeAttribute( 'data-background-hash' );\n\t\telement.removeAttribute( 'data-background-size' );\n\t\telement.removeAttribute( 'data-background-transition' );\n\t\telement.style.backgroundColor = '';\n\n\t\tcontentElement.style.backgroundSize = '';\n\t\tcontentElement.style.backgroundRepeat = '';\n\t\tcontentElement.style.backgroundPosition = '';\n\t\tcontentElement.style.backgroundImage = '';\n\t\tcontentElement.style.opacity = '';\n\t\tcontentElement.innerHTML = '';\n\n\t\tif( data.background ) {\n\t\t\t// Auto-wrap image urls in url(...)\n\t\t\tif( /^(http|file|\\/\\/)/gi.test( data.background ) || /\\.(svg|png|jpg|jpeg|gif|bmp|webp)([?#\\s]|$)/gi.test( data.background ) ) {\n\t\t\t\tslide.setAttribute( 'data-background-image', data.background );\n\t\t\t}\n\t\t\telse {\n\t\t\t\telement.style.background = data.background;\n\t\t\t}\n\t\t}\n\n\t\t// Create a hash for this combination of background settings.\n\t\t// This is used to determine when two slide backgrounds are\n\t\t// the same.\n\t\tif( data.background || data.backgroundColor || data.backgroundGradient || data.backgroundImage || data.backgroundVideo || data.backgroundIframe ) {\n\t\t\telement.setAttribute( 'data-background-hash', data.background +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundSize +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundImage +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundVideo +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundIframe +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundColor +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundGradient +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundRepeat +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundPosition +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundTransition +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata.backgroundOpacity );\n\t\t}\n\n\t\t// Additional and optional background properties\n\t\tif( data.backgroundSize ) element.setAttribute( 'data-background-size', data.backgroundSize );\n\t\tif( data.backgroundColor ) element.style.backgroundColor = data.backgroundColor;\n\t\tif( data.backgroundGradient ) element.style.backgroundImage = data.backgroundGradient;\n\t\tif( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );\n\n\t\tif( dataPreload ) element.setAttribute( 'data-preload', '' );\n\n\t\t// Background image options are set on the content wrapper\n\t\tif( data.backgroundSize ) contentElement.style.backgroundSize = data.backgroundSize;\n\t\tif( data.backgroundRepeat ) contentElement.style.backgroundRepeat = data.backgroundRepeat;\n\t\tif( data.backgroundPosition ) contentElement.style.backgroundPosition = data.backgroundPosition;\n\t\tif( data.backgroundOpacity ) contentElement.style.opacity = data.backgroundOpacity;\n\n\t\t// If this slide has a background color, we add a class that\n\t\t// signals if it is light or dark. If the slide has no background\n\t\t// color, no class will be added\n\t\tlet contrastColor = data.backgroundColor;\n\n\t\t// If no bg color was found, or it cannot be converted by colorToRgb, check the computed background\n\t\tif( !contrastColor || !colorToRgb( contrastColor ) ) {\n\t\t\tlet computedBackgroundStyle = window.getComputedStyle( element );\n\t\t\tif( computedBackgroundStyle && computedBackgroundStyle.backgroundColor ) {\n\t\t\t\tcontrastColor = computedBackgroundStyle.backgroundColor;\n\t\t\t}\n\t\t}\n\n\t\tif( contrastColor ) {\n\t\t\tconst rgb = colorToRgb( contrastColor );\n\n\t\t\t// Ignore fully transparent backgrounds. Some browsers return\n\t\t\t// rgba(0,0,0,0) when reading the computed background color of\n\t\t\t// an element with no background\n\t\t\tif( rgb && rgb.a !== 0 ) {\n\t\t\t\tif( colorBrightness( contrastColor ) < 128 ) {\n\t\t\t\t\tslide.classList.add( 'has-dark-background' );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tslide.classList.add( 'has-light-background' );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the background elements to reflect the current\n\t * slide.\n\t *\n\t * @param {boolean} includeAll If true, the backgrounds of\n\t * all vertical slides (not just the present) will be updated.\n\t */\n\tupdate( includeAll = false ) {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tlet indices = this.Reveal.getIndices();\n\n\t\tlet currentBackground = null;\n\n\t\t// Reverse past/future classes when in RTL mode\n\t\tlet horizontalPast = this.Reveal.getConfig().rtl ? 'future' : 'past',\n\t\t\thorizontalFuture = this.Reveal.getConfig().rtl ? 'past' : 'future';\n\n\t\t// Update the classes of all backgrounds to match the\n\t\t// states of their slides (past/present/future)\n\t\tArray.from( this.element.childNodes ).forEach( ( backgroundh, h ) => {\n\n\t\t\tbackgroundh.classList.remove( 'past', 'present', 'future' );\n\n\t\t\tif( h < indices.h ) {\n\t\t\t\tbackgroundh.classList.add( horizontalPast );\n\t\t\t}\n\t\t\telse if ( h > indices.h ) {\n\t\t\t\tbackgroundh.classList.add( horizontalFuture );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbackgroundh.classList.add( 'present' );\n\n\t\t\t\t// Store a reference to the current background element\n\t\t\t\tcurrentBackground = backgroundh;\n\t\t\t}\n\n\t\t\tif( includeAll || h === indices.h ) {\n\t\t\t\tqueryAll( backgroundh, '.slide-background' ).forEach( ( backgroundv, v ) => {\n\n\t\t\t\t\tbackgroundv.classList.remove( 'past', 'present', 'future' );\n\n\t\t\t\t\tif( v < indices.v ) {\n\t\t\t\t\t\tbackgroundv.classList.add( 'past' );\n\t\t\t\t\t}\n\t\t\t\t\telse if ( v > indices.v ) {\n\t\t\t\t\t\tbackgroundv.classList.add( 'future' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tbackgroundv.classList.add( 'present' );\n\n\t\t\t\t\t\t// Only if this is the present horizontal and vertical slide\n\t\t\t\t\t\tif( h === indices.h ) currentBackground = backgroundv;\n\t\t\t\t\t}\n\n\t\t\t\t} );\n\t\t\t}\n\n\t\t} );\n\n\t\t// Stop content inside of previous backgrounds\n\t\tif( this.previousBackground ) {\n\n\t\t\tthis.Reveal.slideContent.stopEmbeddedContent( this.previousBackground, { unloadIframes: !this.Reveal.slideContent.shouldPreload( this.previousBackground ) } );\n\n\t\t}\n\n\t\t// Start content in the current background\n\t\tif( currentBackground ) {\n\n\t\t\tthis.Reveal.slideContent.startEmbeddedContent( currentBackground );\n\n\t\t\tlet currentBackgroundContent = currentBackground.querySelector( '.slide-background-content' );\n\t\t\tif( currentBackgroundContent ) {\n\n\t\t\t\tlet backgroundImageURL = currentBackgroundContent.style.backgroundImage || '';\n\n\t\t\t\t// Restart GIFs (doesn't work in Firefox)\n\t\t\t\tif( /\\.gif/i.test( backgroundImageURL ) ) {\n\t\t\t\t\tcurrentBackgroundContent.style.backgroundImage = '';\n\t\t\t\t\twindow.getComputedStyle( currentBackgroundContent ).opacity;\n\t\t\t\t\tcurrentBackgroundContent.style.backgroundImage = backgroundImageURL;\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\t// Don't transition between identical backgrounds. This\n\t\t\t// prevents unwanted flicker.\n\t\t\tlet previousBackgroundHash = this.previousBackground ? this.previousBackground.getAttribute( 'data-background-hash' ) : null;\n\t\t\tlet currentBackgroundHash = currentBackground.getAttribute( 'data-background-hash' );\n\t\t\tif( currentBackgroundHash && currentBackgroundHash === previousBackgroundHash && currentBackground !== this.previousBackground ) {\n\t\t\t\tthis.element.classList.add( 'no-transition' );\n\t\t\t}\n\n\t\t\tthis.previousBackground = currentBackground;\n\n\t\t}\n\n\t\t// If there's a background brightness flag for this slide,\n\t\t// bubble it to the .reveal container\n\t\tif( currentSlide ) {\n\t\t\t[ 'has-light-background', 'has-dark-background' ].forEach( classToBubble => {\n\t\t\t\tif( currentSlide.classList.contains( classToBubble ) ) {\n\t\t\t\t\tthis.Reveal.getRevealElement().classList.add( classToBubble );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.getRevealElement().classList.remove( classToBubble );\n\t\t\t\t}\n\t\t\t}, this );\n\t\t}\n\n\t\t// Allow the first background to apply without transition\n\t\tsetTimeout( () => {\n\t\t\tthis.element.classList.remove( 'no-transition' );\n\t\t}, 1 );\n\n\t}\n\n\t/**\n\t * Updates the position of the parallax background based\n\t * on the current slide index.\n\t */\n\tupdateParallax() {\n\n\t\tlet indices = this.Reveal.getIndices();\n\n\t\tif( this.Reveal.getConfig().parallaxBackgroundImage ) {\n\n\t\t\tlet horizontalSlides = this.Reveal.getHorizontalSlides(),\n\t\t\t\tverticalSlides = this.Reveal.getVerticalSlides();\n\n\t\t\tlet backgroundSize = this.element.style.backgroundSize.split( ' ' ),\n\t\t\t\tbackgroundWidth, backgroundHeight;\n\n\t\t\tif( backgroundSize.length === 1 ) {\n\t\t\t\tbackgroundWidth = backgroundHeight = parseInt( backgroundSize[0], 10 );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbackgroundWidth = parseInt( backgroundSize[0], 10 );\n\t\t\t\tbackgroundHeight = parseInt( backgroundSize[1], 10 );\n\t\t\t}\n\n\t\t\tlet slideWidth = this.element.offsetWidth,\n\t\t\t\thorizontalSlideCount = horizontalSlides.length,\n\t\t\t\thorizontalOffsetMultiplier,\n\t\t\t\thorizontalOffset;\n\n\t\t\tif( typeof this.Reveal.getConfig().parallaxBackgroundHorizontal === 'number' ) {\n\t\t\t\thorizontalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundHorizontal;\n\t\t\t}\n\t\t\telse {\n\t\t\t\thorizontalOffsetMultiplier = horizontalSlideCount > 1 ? ( backgroundWidth - slideWidth ) / ( horizontalSlideCount-1 ) : 0;\n\t\t\t}\n\n\t\t\thorizontalOffset = horizontalOffsetMultiplier * indices.h * -1;\n\n\t\t\tlet slideHeight = this.element.offsetHeight,\n\t\t\t\tverticalSlideCount = verticalSlides.length,\n\t\t\t\tverticalOffsetMultiplier,\n\t\t\t\tverticalOffset;\n\n\t\t\tif( typeof this.Reveal.getConfig().parallaxBackgroundVertical === 'number' ) {\n\t\t\t\tverticalOffsetMultiplier = this.Reveal.getConfig().parallaxBackgroundVertical;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tverticalOffsetMultiplier = ( backgroundHeight - slideHeight ) / ( verticalSlideCount-1 );\n\t\t\t}\n\n\t\t\tverticalOffset = verticalSlideCount > 0 ?  verticalOffsetMultiplier * indices.v : 0;\n\n\t\t\tthis.element.style.backgroundPosition = horizontalOffset + 'px ' + -verticalOffset + 'px';\n\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}\n","var $ = require('../internals/export');\nvar toObject = require('../internals/to-object');\nvar nativeKeys = require('../internals/object-keys');\nvar fails = require('../internals/fails');\n\nvar FAILS_ON_PRIMITIVES = fails(function () { nativeKeys(1); });\n\n// `Object.keys` method\n// https://tc39.es/ecma262/#sec-object.keys\n$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES }, {\n  keys: function keys(it) {\n    return nativeKeys(toObject(it));\n  }\n});\n","'use strict';\nvar $ = require('../internals/export');\nvar $filter = require('../internals/array-iteration').filter;\nvar arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');\n\nvar HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('filter');\n\n// `Array.prototype.filter` method\n// https://tc39.es/ecma262/#sec-array.prototype.filter\n// with adding support of @@species\n$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {\n  filter: function filter(callbackfn /* , thisArg */) {\n    return $filter(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);\n  }\n});\n","\nexport const SLIDES_SELECTOR = '.slides section';\nexport const HORIZONTAL_SLIDES_SELECTOR = '.slides>section';\nexport const VERTICAL_SLIDES_SELECTOR = '.slides>section.present>section';\n\n// Methods that may not be invoked via the postMessage API\nexport const POST_MESSAGE_METHOD_BLACKLIST = /registerPlugin|registerKeyboardShortcut|addKeyBinding|addEventListener|showPreview/;\n\n// Regex for retrieving the fragment style from a class attribute\nexport const FRAGMENT_STYLE_REGEX = /fade-(down|up|right|left|out|in-then-out|in-then-semi-out)|semi-fade-out|current-visible|shrink|grow/;","import { queryAll, extend, createStyleSheet, matches, closest } from '../utils/util.js'\nimport { FRAGMENT_STYLE_REGEX } from '../utils/constants.js'\n\n// Counter used to generate unique IDs for auto-animated elements\nlet autoAnimateCounter = 0;\n\n/**\n * Automatically animates matching elements across\n * slides with the [data-auto-animate] attribute.\n */\nexport default class AutoAnimate {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Runs an auto-animation between the given slides.\n\t *\n\t * @param  {HTMLElement} fromSlide\n\t * @param  {HTMLElement} toSlide\n\t */\n\trun( fromSlide, toSlide ) {\n\n\t\t// Clean up after prior animations\n\t\tthis.reset();\n\n\t\tlet allSlides = this.Reveal.getSlides();\n\t\tlet toSlideIndex = allSlides.indexOf( toSlide );\n\t\tlet fromSlideIndex = allSlides.indexOf( fromSlide );\n\n\t\t// Ensure that both slides are auto-animate targets with the same data-auto-animate-id value\n\t\t// (including null if absent on both) and that data-auto-animate-restart isn't set on the\n\t\t// physically latter slide (independent of slide direction)\n\t\tif( fromSlide.hasAttribute( 'data-auto-animate' ) && toSlide.hasAttribute( 'data-auto-animate' )\n\t\t\t\t&& fromSlide.getAttribute( 'data-auto-animate-id' ) === toSlide.getAttribute( 'data-auto-animate-id' ) \n\t\t\t\t&& !( toSlideIndex > fromSlideIndex ? toSlide : fromSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {\n\n\t\t\t// Create a new auto-animate sheet\n\t\t\tthis.autoAnimateStyleSheet = this.autoAnimateStyleSheet || createStyleSheet();\n\n\t\t\tlet animationOptions = this.getAutoAnimateOptions( toSlide );\n\n\t\t\t// Set our starting state\n\t\t\tfromSlide.dataset.autoAnimate = 'pending';\n\t\t\ttoSlide.dataset.autoAnimate = 'pending';\n\n\t\t\t// Flag the navigation direction, needed for fragment buildup\n\t\t\tanimationOptions.slideDirection = toSlideIndex > fromSlideIndex ? 'forward' : 'backward';\n\n\t\t\t// If the from-slide is hidden because it has moved outside\n\t\t\t// the view distance, we need to temporarily show it while\n\t\t\t// measuring\n\t\t\tlet fromSlideIsHidden = fromSlide.style.display === 'none';\n\t\t\tif( fromSlideIsHidden ) fromSlide.style.display = this.Reveal.getConfig().display;\n\n\t\t\t// Inject our auto-animate styles for this transition\n\t\t\tlet css = this.getAutoAnimatableElements( fromSlide, toSlide ).map( elements => {\n\t\t\t\treturn this.autoAnimateElements( elements.from, elements.to, elements.options || {}, animationOptions, autoAnimateCounter++ );\n\t\t\t} );\n\n\t\t\tif( fromSlideIsHidden ) fromSlide.style.display = 'none';\n\n\t\t\t// Animate unmatched elements, if enabled\n\t\t\tif( toSlide.dataset.autoAnimateUnmatched !== 'false' && this.Reveal.getConfig().autoAnimateUnmatched === true ) {\n\n\t\t\t\t// Our default timings for unmatched elements\n\t\t\t\tlet defaultUnmatchedDuration = animationOptions.duration * 0.8,\n\t\t\t\t\tdefaultUnmatchedDelay = animationOptions.duration * 0.2;\n\n\t\t\t\tthis.getUnmatchedAutoAnimateElements( toSlide ).forEach( unmatchedElement => {\n\n\t\t\t\t\tlet unmatchedOptions = this.getAutoAnimateOptions( unmatchedElement, animationOptions );\n\t\t\t\t\tlet id = 'unmatched';\n\n\t\t\t\t\t// If there is a duration or delay set specifically for this\n\t\t\t\t\t// element our unmatched elements should adhere to those\n\t\t\t\t\tif( unmatchedOptions.duration !== animationOptions.duration || unmatchedOptions.delay !== animationOptions.delay ) {\n\t\t\t\t\t\tid = 'unmatched-' + autoAnimateCounter++;\n\t\t\t\t\t\tcss.push( `[data-auto-animate=\"running\"] [data-auto-animate-target=\"${id}\"] { transition: opacity ${unmatchedOptions.duration}s ease ${unmatchedOptions.delay}s; }` );\n\t\t\t\t\t}\n\n\t\t\t\t\tunmatchedElement.dataset.autoAnimateTarget = id;\n\n\t\t\t\t}, this );\n\n\t\t\t\t// Our default transition for unmatched elements\n\t\t\t\tcss.push( `[data-auto-animate=\"running\"] [data-auto-animate-target=\"unmatched\"] { transition: opacity ${defaultUnmatchedDuration}s ease ${defaultUnmatchedDelay}s; }` );\n\n\t\t\t}\n\n\t\t\t// Setting the whole chunk of CSS at once is the most\n\t\t\t// efficient way to do this. Using sheet.insertRule\n\t\t\t// is multiple factors slower.\n\t\t\tthis.autoAnimateStyleSheet.innerHTML = css.join( '' );\n\n\t\t\t// Start the animation next cycle\n\t\t\trequestAnimationFrame( () => {\n\t\t\t\tif( this.autoAnimateStyleSheet ) {\n\t\t\t\t\t// This forces our newly injected styles to be applied in Firefox\n\t\t\t\t\tgetComputedStyle( this.autoAnimateStyleSheet ).fontWeight;\n\n\t\t\t\t\ttoSlide.dataset.autoAnimate = 'running';\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'autoanimate',\n\t\t\t\tdata: {\n\t\t\t\t\tfromSlide,\n\t\t\t\t\ttoSlide,\n\t\t\t\t\tsheet: this.autoAnimateStyleSheet\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Rolls back all changes that we've made to the DOM so\n\t * that as part of animating.\n\t */\n\treset() {\n\n\t\t// Reset slides\n\t\tqueryAll( this.Reveal.getRevealElement(), '[data-auto-animate]:not([data-auto-animate=\"\"])' ).forEach( element => {\n\t\t\telement.dataset.autoAnimate = '';\n\t\t} );\n\n\t\t// Reset elements\n\t\tqueryAll( this.Reveal.getRevealElement(), '[data-auto-animate-target]' ).forEach( element => {\n\t\t\tdelete element.dataset.autoAnimateTarget;\n\t\t} );\n\n\t\t// Remove the animation sheet\n\t\tif( this.autoAnimateStyleSheet && this.autoAnimateStyleSheet.parentNode ) {\n\t\t\tthis.autoAnimateStyleSheet.parentNode.removeChild( this.autoAnimateStyleSheet );\n\t\t\tthis.autoAnimateStyleSheet = null;\n\t\t}\n\n\t}\n\n\t/**\n\t * Creates a FLIP animation where the `to` element starts out\n\t * in the `from` element position and animates to its original\n\t * state.\n\t *\n\t * @param {HTMLElement} from\n\t * @param {HTMLElement} to\n\t * @param {Object} elementOptions Options for this element pair\n\t * @param {Object} animationOptions Options set at the slide level\n\t * @param {String} id Unique ID that we can use to identify this\n\t * auto-animate element in the DOM\n\t */\n\tautoAnimateElements( from, to, elementOptions, animationOptions, id ) {\n\n\t\t// 'from' elements are given a data-auto-animate-target with no value,\n\t\t// 'to' elements are are given a data-auto-animate-target with an ID\n\t\tfrom.dataset.autoAnimateTarget = '';\n\t\tto.dataset.autoAnimateTarget = id;\n\n\t\t// Each element may override any of the auto-animate options\n\t\t// like transition easing, duration and delay via data-attributes\n\t\tlet options = this.getAutoAnimateOptions( to, animationOptions );\n\n\t\t// If we're using a custom element matcher the element options\n\t\t// may contain additional transition overrides\n\t\tif( typeof elementOptions.delay !== 'undefined' ) options.delay = elementOptions.delay;\n\t\tif( typeof elementOptions.duration !== 'undefined' ) options.duration = elementOptions.duration;\n\t\tif( typeof elementOptions.easing !== 'undefined' ) options.easing = elementOptions.easing;\n\n\t\tlet fromProps = this.getAutoAnimatableProperties( 'from', from, elementOptions ),\n\t\t\ttoProps = this.getAutoAnimatableProperties( 'to', to, elementOptions );\n\n\t\t// Maintain fragment visibility for matching elements when\n\t\t// we're navigating forwards, this way the viewer won't need\n\t\t// to step through the same fragments twice\n\t\tif( to.classList.contains( 'fragment' ) ) {\n\n\t\t\t// Don't auto-animate the opacity of fragments to avoid\n\t\t\t// conflicts with fragment animations\n\t\t\tdelete toProps.styles['opacity'];\n\n\t\t\tif( from.classList.contains( 'fragment' ) ) {\n\n\t\t\t\tlet fromFragmentStyle = ( from.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];\n\t\t\t\tlet toFragmentStyle = ( to.className.match( FRAGMENT_STYLE_REGEX ) || [''] )[0];\n\n\t\t\t\t// Only skip the fragment if the fragment animation style\n\t\t\t\t// remains unchanged\n\t\t\t\tif( fromFragmentStyle === toFragmentStyle && animationOptions.slideDirection === 'forward' ) {\n\t\t\t\t\tto.classList.add( 'visible', 'disabled' );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t// If translation and/or scaling are enabled, css transform\n\t\t// the 'to' element so that it matches the position and size\n\t\t// of the 'from' element\n\t\tif( elementOptions.translate !== false || elementOptions.scale !== false ) {\n\n\t\t\tlet presentationScale = this.Reveal.getScale();\n\n\t\t\tlet delta = {\n\t\t\t\tx: ( fromProps.x - toProps.x ) / presentationScale,\n\t\t\t\ty: ( fromProps.y - toProps.y ) / presentationScale,\n\t\t\t\tscaleX: fromProps.width / toProps.width,\n\t\t\t\tscaleY: fromProps.height / toProps.height\n\t\t\t};\n\n\t\t\t// Limit decimal points to avoid 0.0001px blur and stutter\n\t\t\tdelta.x = Math.round( delta.x * 1000 ) / 1000;\n\t\t\tdelta.y = Math.round( delta.y * 1000 ) / 1000;\n\t\t\tdelta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;\n\t\t\tdelta.scaleX = Math.round( delta.scaleX * 1000 ) / 1000;\n\n\t\t\tlet translate = elementOptions.translate !== false && ( delta.x !== 0 || delta.y !== 0 ),\n\t\t\t\tscale = elementOptions.scale !== false && ( delta.scaleX !== 0 || delta.scaleY !== 0 );\n\n\t\t\t// No need to transform if nothing's changed\n\t\t\tif( translate || scale ) {\n\n\t\t\t\tlet transform = [];\n\n\t\t\t\tif( translate ) transform.push( `translate(${delta.x}px, ${delta.y}px)` );\n\t\t\t\tif( scale ) transform.push( `scale(${delta.scaleX}, ${delta.scaleY})` );\n\n\t\t\t\tfromProps.styles['transform'] = transform.join( ' ' );\n\t\t\t\tfromProps.styles['transform-origin'] = 'top left';\n\n\t\t\t\ttoProps.styles['transform'] = 'none';\n\n\t\t\t}\n\n\t\t}\n\n\t\t// Delete all unchanged 'to' styles\n\t\tfor( let propertyName in toProps.styles ) {\n\t\t\tconst toValue = toProps.styles[propertyName];\n\t\t\tconst fromValue = fromProps.styles[propertyName];\n\n\t\t\tif( toValue === fromValue ) {\n\t\t\t\tdelete toProps.styles[propertyName];\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// If these property values were set via a custom matcher providing\n\t\t\t\t// an explicit 'from' and/or 'to' value, we always inject those values.\n\t\t\t\tif( toValue.explicitValue === true ) {\n\t\t\t\t\ttoProps.styles[propertyName] = toValue.value;\n\t\t\t\t}\n\n\t\t\t\tif( fromValue.explicitValue === true ) {\n\t\t\t\t\tfromProps.styles[propertyName] = fromValue.value;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tlet css = '';\n\n\t\tlet toStyleProperties = Object.keys( toProps.styles );\n\n\t\t// Only create animate this element IF at least one style\n\t\t// property has changed\n\t\tif( toStyleProperties.length > 0 ) {\n\n\t\t\t// Instantly move to the 'from' state\n\t\t\tfromProps.styles['transition'] = 'none';\n\n\t\t\t// Animate towards the 'to' state\n\t\t\ttoProps.styles['transition'] = `all ${options.duration}s ${options.easing} ${options.delay}s`;\n\t\t\ttoProps.styles['transition-property'] = toStyleProperties.join( ', ' );\n\t\t\ttoProps.styles['will-change'] = toStyleProperties.join( ', ' );\n\n\t\t\t// Build up our custom CSS. We need to override inline styles\n\t\t\t// so we need to make our styles vErY IMPORTANT!1!!\n\t\t\tlet fromCSS = Object.keys( fromProps.styles ).map( propertyName => {\n\t\t\t\treturn propertyName + ': ' + fromProps.styles[propertyName] + ' !important;';\n\t\t\t} ).join( '' );\n\n\t\t\tlet toCSS = Object.keys( toProps.styles ).map( propertyName => {\n\t\t\t\treturn propertyName + ': ' + toProps.styles[propertyName] + ' !important;';\n\t\t\t} ).join( '' );\n\n\t\t\tcss = \t'[data-auto-animate-target=\"'+ id +'\"] {'+ fromCSS +'}' +\n\t\t\t\t\t'[data-auto-animate=\"running\"] [data-auto-animate-target=\"'+ id +'\"] {'+ toCSS +'}';\n\n\t\t}\n\n\t\treturn css;\n\n\t}\n\n\t/**\n\t * Returns the auto-animate options for the given element.\n\t *\n\t * @param {HTMLElement} element Element to pick up options\n\t * from, either a slide or an animation target\n\t * @param {Object} [inheritedOptions] Optional set of existing\n\t * options\n\t */\n\tgetAutoAnimateOptions( element, inheritedOptions ) {\n\n\t\tlet options = {\n\t\t\teasing: this.Reveal.getConfig().autoAnimateEasing,\n\t\t\tduration: this.Reveal.getConfig().autoAnimateDuration,\n\t\t\tdelay: 0\n\t\t};\n\n\t\toptions = extend( options, inheritedOptions );\n\n\t\t// Inherit options from parent elements\n\t\tif( element.parentNode ) {\n\t\t\tlet autoAnimatedParent = closest( element.parentNode, '[data-auto-animate-target]' );\n\t\t\tif( autoAnimatedParent ) {\n\t\t\t\toptions = this.getAutoAnimateOptions( autoAnimatedParent, options );\n\t\t\t}\n\t\t}\n\n\t\tif( element.dataset.autoAnimateEasing ) {\n\t\t\toptions.easing = element.dataset.autoAnimateEasing;\n\t\t}\n\n\t\tif( element.dataset.autoAnimateDuration ) {\n\t\t\toptions.duration = parseFloat( element.dataset.autoAnimateDuration );\n\t\t}\n\n\t\tif( element.dataset.autoAnimateDelay ) {\n\t\t\toptions.delay = parseFloat( element.dataset.autoAnimateDelay );\n\t\t}\n\n\t\treturn options;\n\n\t}\n\n\t/**\n\t * Returns an object containing all of the properties\n\t * that can be auto-animated for the given element and\n\t * their current computed values.\n\t *\n\t * @param {String} direction 'from' or 'to'\n\t */\n\tgetAutoAnimatableProperties( direction, element, elementOptions ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\tlet properties = { styles: [] };\n\n\t\t// Position and size\n\t\tif( elementOptions.translate !== false || elementOptions.scale !== false ) {\n\t\t\tlet bounds;\n\n\t\t\t// Custom auto-animate may optionally return a custom tailored\n\t\t\t// measurement function\n\t\t\tif( typeof elementOptions.measure === 'function' ) {\n\t\t\t\tbounds = elementOptions.measure( element );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif( config.center ) {\n\t\t\t\t\t// More precise, but breaks when used in combination\n\t\t\t\t\t// with zoom for scaling the deck ¯\\_(ツ)_/¯\n\t\t\t\t\tbounds = element.getBoundingClientRect();\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tlet scale = this.Reveal.getScale();\n\t\t\t\t\tbounds = {\n\t\t\t\t\t\tx: element.offsetLeft * scale,\n\t\t\t\t\t\ty: element.offsetTop * scale,\n\t\t\t\t\t\twidth: element.offsetWidth * scale,\n\t\t\t\t\t\theight: element.offsetHeight * scale\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tproperties.x = bounds.x;\n\t\t\tproperties.y = bounds.y;\n\t\t\tproperties.width = bounds.width;\n\t\t\tproperties.height = bounds.height;\n\t\t}\n\n\t\tconst computedStyles = getComputedStyle( element );\n\n\t\t// CSS styles\n\t\t( elementOptions.styles || config.autoAnimateStyles ).forEach( style => {\n\t\t\tlet value;\n\n\t\t\t// `style` is either the property name directly, or an object\n\t\t\t// definition of a style property\n\t\t\tif( typeof style === 'string' ) style = { property: style };\n\n\t\t\tif( typeof style.from !== 'undefined' && direction === 'from' ) {\n\t\t\t\tvalue = { value: style.from, explicitValue: true };\n\t\t\t}\n\t\t\telse if( typeof style.to !== 'undefined' && direction === 'to' ) {\n\t\t\t\tvalue = { value: style.to, explicitValue: true };\n\t\t\t}\n\t\t\telse {\n\t\t\t\tvalue = computedStyles[style.property];\n\t\t\t}\n\n\t\t\tif( value !== '' ) {\n\t\t\t\tproperties.styles[style.property] = value;\n\t\t\t}\n\t\t} );\n\n\t\treturn properties;\n\n\t}\n\n\t/**\n\t * Get a list of all element pairs that we can animate\n\t * between the given slides.\n\t *\n\t * @param {HTMLElement} fromSlide\n\t * @param {HTMLElement} toSlide\n\t *\n\t * @return {Array} Each value is an array where [0] is\n\t * the element we're animating from and [1] is the\n\t * element we're animating to\n\t */\n\tgetAutoAnimatableElements( fromSlide, toSlide ) {\n\n\t\tlet matcher = typeof this.Reveal.getConfig().autoAnimateMatcher === 'function' ? this.Reveal.getConfig().autoAnimateMatcher : this.getAutoAnimatePairs;\n\n\t\tlet pairs = matcher.call( this, fromSlide, toSlide );\n\n\t\tlet reserved = [];\n\n\t\t// Remove duplicate pairs\n\t\treturn pairs.filter( ( pair, index ) => {\n\t\t\tif( reserved.indexOf( pair.to ) === -1 ) {\n\t\t\t\treserved.push( pair.to );\n\t\t\t\treturn true;\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Identifies matching elements between slides.\n\t *\n\t * You can specify a custom matcher function by using\n\t * the `autoAnimateMatcher` config option.\n\t */\n\tgetAutoAnimatePairs( fromSlide, toSlide ) {\n\n\t\tlet pairs = [];\n\n\t\tconst codeNodes = 'pre';\n\t\tconst textNodes = 'h1, h2, h3, h4, h5, h6, p, li';\n\t\tconst mediaNodes = 'img, video, iframe';\n\n\t\t// Eplicit matches via data-id\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', node => {\n\t\t\treturn node.nodeName + ':::' + node.getAttribute( 'data-id' );\n\t\t} );\n\n\t\t// Text\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, textNodes, node => {\n\t\t\treturn node.nodeName + ':::' + node.innerText;\n\t\t} );\n\n\t\t// Media\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, mediaNodes, node => {\n\t\t\treturn node.nodeName + ':::' + ( node.getAttribute( 'src' ) || node.getAttribute( 'data-src' ) );\n\t\t} );\n\n\t\t// Code\n\t\tthis.findAutoAnimateMatches( pairs, fromSlide, toSlide, codeNodes, node => {\n\t\t\treturn node.nodeName + ':::' + node.innerText;\n\t\t} );\n\n\t\tpairs.forEach( pair => {\n\n\t\t\t// Disable scale transformations on text nodes, we transition\n\t\t\t// each individual text property instead\n\t\t\tif( matches( pair.from, textNodes ) ) {\n\t\t\t\tpair.options = { scale: false };\n\t\t\t}\n\t\t\t// Animate individual lines of code\n\t\t\telse if( matches( pair.from, codeNodes ) ) {\n\n\t\t\t\t// Transition the code block's width and height instead of scaling\n\t\t\t\t// to prevent its content from being squished\n\t\t\t\tpair.options = { scale: false, styles: [ 'width', 'height' ] };\n\n\t\t\t\t// Lines of code\n\t\t\t\tthis.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-code', node => {\n\t\t\t\t\treturn node.textContent;\n\t\t\t\t}, {\n\t\t\t\t\tscale: false,\n\t\t\t\t\tstyles: [],\n\t\t\t\t\tmeasure: this.getLocalBoundingBox.bind( this )\n\t\t\t\t} );\n\n\t\t\t\t// Line numbers\n\t\t\t\tthis.findAutoAnimateMatches( pairs, pair.from, pair.to, '.hljs .hljs-ln-line[data-line-number]', node => {\n\t\t\t\t\treturn node.getAttribute( 'data-line-number' );\n\t\t\t\t}, {\n\t\t\t\t\tscale: false,\n\t\t\t\t\tstyles: [ 'width' ],\n\t\t\t\t\tmeasure: this.getLocalBoundingBox.bind( this )\n\t\t\t\t} );\n\n\t\t\t}\n\n\t\t}, this );\n\n\t\treturn pairs;\n\n\t}\n\n\t/**\n\t * Helper method which returns a bounding box based on\n\t * the given elements offset coordinates.\n\t *\n\t * @param {HTMLElement} element\n\t * @return {Object} x, y, width, height\n\t */\n\tgetLocalBoundingBox( element ) {\n\n\t\tconst presentationScale = this.Reveal.getScale();\n\n\t\treturn {\n\t\t\tx: Math.round( ( element.offsetLeft * presentationScale ) * 100 ) / 100,\n\t\t\ty: Math.round( ( element.offsetTop * presentationScale ) * 100 ) / 100,\n\t\t\twidth: Math.round( ( element.offsetWidth * presentationScale ) * 100 ) / 100,\n\t\t\theight: Math.round( ( element.offsetHeight * presentationScale ) * 100 ) / 100\n\t\t};\n\n\t}\n\n\t/**\n\t * Finds matching elements between two slides.\n\t *\n\t * @param {Array} pairs            \tList of pairs to push matches to\n\t * @param {HTMLElement} fromScope   Scope within the from element exists\n\t * @param {HTMLElement} toScope     Scope within the to element exists\n\t * @param {String} selector         CSS selector of the element to match\n\t * @param {Function} serializer     A function that accepts an element and returns\n\t *                                  a stringified ID based on its contents\n\t * @param {Object} animationOptions Optional config options for this pair\n\t */\n\tfindAutoAnimateMatches( pairs, fromScope, toScope, selector, serializer, animationOptions ) {\n\n\t\tlet fromMatches = {};\n\t\tlet toMatches = {};\n\n\t\t[].slice.call( fromScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {\n\t\t\tconst key = serializer( element );\n\t\t\tif( typeof key === 'string' && key.length ) {\n\t\t\t\tfromMatches[key] = fromMatches[key] || [];\n\t\t\t\tfromMatches[key].push( element );\n\t\t\t}\n\t\t} );\n\n\t\t[].slice.call( toScope.querySelectorAll( selector ) ).forEach( ( element, i ) => {\n\t\t\tconst key = serializer( element );\n\t\t\ttoMatches[key] = toMatches[key] || [];\n\t\t\ttoMatches[key].push( element );\n\n\t\t\tlet fromElement;\n\n\t\t\t// Retrieve the 'from' element\n\t\t\tif( fromMatches[key] ) {\n\t\t\t\tconst pimaryIndex = toMatches[key].length - 1;\n\t\t\t\tconst secondaryIndex = fromMatches[key].length - 1;\n\n\t\t\t\t// If there are multiple identical from elements, retrieve\n\t\t\t\t// the one at the same index as our to-element.\n\t\t\t\tif( fromMatches[key][ pimaryIndex ] ) {\n\t\t\t\t\tfromElement = fromMatches[key][ pimaryIndex ];\n\t\t\t\t\tfromMatches[key][ pimaryIndex ] = null;\n\t\t\t\t}\n\t\t\t\t// If there are no matching from-elements at the same index,\n\t\t\t\t// use the last one.\n\t\t\t\telse if( fromMatches[key][ secondaryIndex ] ) {\n\t\t\t\t\tfromElement = fromMatches[key][ secondaryIndex ];\n\t\t\t\t\tfromMatches[key][ secondaryIndex ] = null;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If we've got a matching pair, push it to the list of pairs\n\t\t\tif( fromElement ) {\n\t\t\t\tpairs.push({\n\t\t\t\t\tfrom: fromElement,\n\t\t\t\t\tto: element,\n\t\t\t\t\toptions: animationOptions\n\t\t\t\t});\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Returns a all elements within the given scope that should\n\t * be considered unmatched in an auto-animate transition. If\n\t * fading of unmatched elements is turned on, these elements\n\t * will fade when going between auto-animate slides.\n\t *\n\t * Note that parents of auto-animate targets are NOT considerd\n\t * unmatched since fading them would break the auto-animation.\n\t *\n\t * @param {HTMLElement} rootElement\n\t * @return {Array}\n\t */\n\tgetUnmatchedAutoAnimateElements( rootElement ) {\n\n\t\treturn [].slice.call( rootElement.children ).reduce( ( result, element ) => {\n\n\t\t\tconst containsAnimatedElements = element.querySelector( '[data-auto-animate-target]' );\n\n\t\t\t// The element is unmatched if\n\t\t\t// - It is not an auto-animate target\n\t\t\t// - It does not contain any auto-animate targets\n\t\t\tif( !element.hasAttribute( 'data-auto-animate-target' ) && !containsAnimatedElements ) {\n\t\t\t\tresult.push( element );\n\t\t\t}\n\n\t\t\tif( element.querySelector( '[data-auto-animate-target]' ) ) {\n\t\t\t\tresult = result.concat( this.getUnmatchedAutoAnimateElements( element ) );\n\t\t\t}\n\n\t\t\treturn result;\n\n\t\t}, [] );\n\n\t}\n\n}\n","import { extend, queryAll } from '../utils/util.js'\n\n/**\n * Handles sorting and navigation of slide fragments.\n * Fragments are elements within a slide that are\n * revealed/animated incrementally.\n */\nexport default class Fragments {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.fragments === false ) {\n\t\t\tthis.disable();\n\t\t}\n\t\telse if( oldConfig.fragments === false ) {\n\t\t\tthis.enable();\n\t\t}\n\n\t}\n\n\t/**\n\t * If fragments are disabled in the deck, they should all be\n\t * visible rather than stepped through.\n\t */\n\tdisable() {\n\n\t\tqueryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {\n\t\t\telement.classList.add( 'visible' );\n\t\t\telement.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Reverse of #disable(). Only called if fragments have\n\t * previously been disabled.\n\t */\n\tenable() {\n\n\t\tqueryAll( this.Reveal.getSlidesElement(), '.fragment' ).forEach( element => {\n\t\t\telement.classList.remove( 'visible' );\n\t\t\telement.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Returns an object describing the available fragment\n\t * directions.\n\t *\n\t * @return {{prev: boolean, next: boolean}}\n\t */\n\tavailableRoutes() {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\t\t\tlet fragments = currentSlide.querySelectorAll( '.fragment:not(.disabled)' );\n\t\t\tlet hiddenFragments = currentSlide.querySelectorAll( '.fragment:not(.disabled):not(.visible)' );\n\n\t\t\treturn {\n\t\t\t\tprev: fragments.length - hiddenFragments.length > 0,\n\t\t\t\tnext: !!hiddenFragments.length\n\t\t\t};\n\t\t}\n\t\telse {\n\t\t\treturn { prev: false, next: false };\n\t\t}\n\n\t}\n\n\t/**\n\t * Return a sorted fragments list, ordered by an increasing\n\t * \"data-fragment-index\" attribute.\n\t *\n\t * Fragments will be revealed in the order that they are returned by\n\t * this function, so you can use the index attributes to control the\n\t * order of fragment appearance.\n\t *\n\t * To maintain a sensible default fragment order, fragments are presumed\n\t * to be passed in document order. This function adds a \"fragment-index\"\n\t * attribute to each node if such an attribute is not already present,\n\t * and sets that attribute to an integer value which is the position of\n\t * the fragment within the fragments list.\n\t *\n\t * @param {object[]|*} fragments\n\t * @param {boolean} grouped If true the returned array will contain\n\t * nested arrays for all fragments with the same index\n\t * @return {object[]} sorted Sorted array of fragments\n\t */\n\tsort( fragments, grouped = false ) {\n\n\t\tfragments = Array.from( fragments );\n\n\t\tlet ordered = [],\n\t\t\tunordered = [],\n\t\t\tsorted = [];\n\n\t\t// Group ordered and unordered elements\n\t\tfragments.forEach( fragment => {\n\t\t\tif( fragment.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\tlet index = parseInt( fragment.getAttribute( 'data-fragment-index' ), 10 );\n\n\t\t\t\tif( !ordered[index] ) {\n\t\t\t\t\tordered[index] = [];\n\t\t\t\t}\n\n\t\t\t\tordered[index].push( fragment );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tunordered.push( [ fragment ] );\n\t\t\t}\n\t\t} );\n\n\t\t// Append fragments without explicit indices in their\n\t\t// DOM order\n\t\tordered = ordered.concat( unordered );\n\n\t\t// Manually count the index up per group to ensure there\n\t\t// are no gaps\n\t\tlet index = 0;\n\n\t\t// Push all fragments in their sorted order to an array,\n\t\t// this flattens the groups\n\t\tordered.forEach( group => {\n\t\t\tgroup.forEach( fragment => {\n\t\t\t\tsorted.push( fragment );\n\t\t\t\tfragment.setAttribute( 'data-fragment-index', index );\n\t\t\t} );\n\n\t\t\tindex ++;\n\t\t} );\n\n\t\treturn grouped === true ? ordered : sorted;\n\n\t}\n\n\t/**\n\t * Sorts and formats all of fragments in the\n\t * presentation.\n\t */\n\tsortAll() {\n\n\t\tthis.Reveal.getHorizontalSlides().forEach( horizontalSlide => {\n\n\t\t\tlet verticalSlides = queryAll( horizontalSlide, 'section' );\n\t\t\tverticalSlides.forEach( ( verticalSlide, y ) => {\n\n\t\t\t\tthis.sort( verticalSlide.querySelectorAll( '.fragment' ) );\n\n\t\t\t}, this );\n\n\t\t\tif( verticalSlides.length === 0 ) this.sort( horizontalSlide.querySelectorAll( '.fragment' ) );\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Refreshes the fragments on the current slide so that they\n\t * have the appropriate classes (.visible + .current-fragment).\n\t *\n\t * @param {number} [index] The index of the current fragment\n\t * @param {array} [fragments] Array containing all fragments\n\t * in the current slide\n\t *\n\t * @return {{shown: array, hidden: array}}\n\t */\n\tupdate( index, fragments ) {\n\n\t\tlet changedFragments = {\n\t\t\tshown: [],\n\t\t\thidden: []\n\t\t};\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\n\t\t\tfragments = fragments || this.sort( currentSlide.querySelectorAll( '.fragment' ) );\n\n\t\t\tif( fragments.length ) {\n\n\t\t\t\tlet maxIndex = 0;\n\n\t\t\t\tif( typeof index !== 'number' ) {\n\t\t\t\t\tlet currentFragment = this.sort( currentSlide.querySelectorAll( '.fragment.visible' ) ).pop();\n\t\t\t\t\tif( currentFragment ) {\n\t\t\t\t\t\tindex = parseInt( currentFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tArray.from( fragments ).forEach( ( el, i ) => {\n\n\t\t\t\t\tif( el.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\t\t\ti = parseInt( el.getAttribute( 'data-fragment-index' ), 10 );\n\t\t\t\t\t}\n\n\t\t\t\t\tmaxIndex = Math.max( maxIndex, i );\n\n\t\t\t\t\t// Visible fragments\n\t\t\t\t\tif( i <= index ) {\n\t\t\t\t\t\tlet wasVisible = el.classList.contains( 'visible' )\n\t\t\t\t\t\tel.classList.add( 'visible' );\n\t\t\t\t\t\tel.classList.remove( 'current-fragment' );\n\n\t\t\t\t\t\tif( i === index ) {\n\t\t\t\t\t\t\t// Announce the fragments one by one to the Screen Reader\n\t\t\t\t\t\t\tthis.Reveal.announceStatus( this.Reveal.getStatusText( el ) );\n\n\t\t\t\t\t\t\tel.classList.add( 'current-fragment' );\n\t\t\t\t\t\t\tthis.Reveal.slideContent.startEmbeddedContent( el );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tif( !wasVisible ) {\n\t\t\t\t\t\t\tchangedFragments.shown.push( el )\n\t\t\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\t\t\ttarget: el,\n\t\t\t\t\t\t\t\ttype: 'visible',\n\t\t\t\t\t\t\t\tbubbles: false\n\t\t\t\t\t\t\t});\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\t// Hidden fragments\n\t\t\t\t\telse {\n\t\t\t\t\t\tlet wasVisible = el.classList.contains( 'visible' )\n\t\t\t\t\t\tel.classList.remove( 'visible' );\n\t\t\t\t\t\tel.classList.remove( 'current-fragment' );\n\n\t\t\t\t\t\tif( wasVisible ) {\n\t\t\t\t\t\t\tthis.Reveal.slideContent.stopEmbeddedContent( el );\n\t\t\t\t\t\t\tchangedFragments.hidden.push( el );\n\t\t\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\t\t\ttarget: el,\n\t\t\t\t\t\t\t\ttype: 'hidden',\n\t\t\t\t\t\t\t\tbubbles: false\n\t\t\t\t\t\t\t});\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t} );\n\n\t\t\t\t// Write the current fragment index to the slide <section>.\n\t\t\t\t// This can be used by end users to apply styles based on\n\t\t\t\t// the current fragment index.\n\t\t\t\tindex = typeof index === 'number' ? index : -1;\n\t\t\t\tindex = Math.max( Math.min( index, maxIndex ), -1 );\n\t\t\t\tcurrentSlide.setAttribute( 'data-fragment', index );\n\n\t\t\t}\n\n\t\t}\n\n\t\treturn changedFragments;\n\n\t}\n\n\t/**\n\t * Formats the fragments on the given slide so that they have\n\t * valid indices. Call this if fragments are changed in the DOM\n\t * after reveal.js has already initialized.\n\t *\n\t * @param {HTMLElement} slide\n\t * @return {Array} a list of the HTML fragments that were synced\n\t */\n\tsync( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\treturn this.sort( slide.querySelectorAll( '.fragment' ) );\n\n\t}\n\n\t/**\n\t * Navigate to the specified slide fragment.\n\t *\n\t * @param {?number} index The index of the fragment that\n\t * should be shown, -1 means all are invisible\n\t * @param {number} offset Integer offset to apply to the\n\t * fragment index\n\t *\n\t * @return {boolean} true if a change was made in any\n\t * fragments visibility as part of this call\n\t */\n\tgoto( index, offset = 0 ) {\n\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide && this.Reveal.getConfig().fragments ) {\n\n\t\t\tlet fragments = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled)' ) );\n\t\t\tif( fragments.length ) {\n\n\t\t\t\t// If no index is specified, find the current\n\t\t\t\tif( typeof index !== 'number' ) {\n\t\t\t\t\tlet lastVisibleFragment = this.sort( currentSlide.querySelectorAll( '.fragment:not(.disabled).visible' ) ).pop();\n\n\t\t\t\t\tif( lastVisibleFragment ) {\n\t\t\t\t\t\tindex = parseInt( lastVisibleFragment.getAttribute( 'data-fragment-index' ) || 0, 10 );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tindex = -1;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Apply the offset if there is one\n\t\t\t\tindex += offset;\n\n\t\t\t\tlet changedFragments = this.update( index, fragments );\n\n\t\t\t\tif( changedFragments.hidden.length ) {\n\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\ttype: 'fragmenthidden',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\tfragment: changedFragments.hidden[0],\n\t\t\t\t\t\t\tfragments: changedFragments.hidden\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tif( changedFragments.shown.length ) {\n\t\t\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\t\t\ttype: 'fragmentshown',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\tfragment: changedFragments.shown[0],\n\t\t\t\t\t\t\tfragments: changedFragments.shown\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tthis.Reveal.controls.update();\n\t\t\t\tthis.Reveal.progress.update();\n\n\t\t\t\tif( this.Reveal.getConfig().fragmentInURL ) {\n\t\t\t\t\tthis.Reveal.location.writeURL();\n\t\t\t\t}\n\n\t\t\t\treturn !!( changedFragments.shown.length || changedFragments.hidden.length );\n\n\t\t\t}\n\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Navigate to the next slide fragment.\n\t *\n\t * @return {boolean} true if there was a next fragment,\n\t * false otherwise\n\t */\n\tnext() {\n\n\t\treturn this.goto( null, 1 );\n\n\t}\n\n\t/**\n\t * Navigate to the previous slide fragment.\n\t *\n\t * @return {boolean} true if there was a previous fragment,\n\t * false otherwise\n\t */\n\tprev() {\n\n\t\treturn this.goto( null, -1 );\n\n\t}\n\n}","import { SLIDES_SELECTOR } from '../utils/constants.js'\nimport { extend, queryAll, transformElement } from '../utils/util.js'\n\n/**\n * Handles all logic related to the overview mode\n * (birds-eye view of all slides).\n */\nexport default class Overview {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.active = false;\n\n\t\tthis.onSlideClicked = this.onSlideClicked.bind( this );\n\n\t}\n\n\t/**\n\t * Displays the overview of slides (quick nav) by scaling\n\t * down and arranging all slide elements.\n\t */\n\tactivate() {\n\n\t\t// Only proceed if enabled in config\n\t\tif( this.Reveal.getConfig().overview && !this.isActive() ) {\n\n\t\t\tthis.active = true;\n\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'overview' );\n\n\t\t\t// Don't auto-slide while in overview mode\n\t\t\tthis.Reveal.cancelAutoSlide();\n\n\t\t\t// Move the backgrounds element into the slide container to\n\t\t\t// that the same scaling is applied\n\t\t\tthis.Reveal.getSlidesElement().appendChild( this.Reveal.getBackgroundsElement() );\n\n\t\t\t// Clicking on an overview slide navigates to it\n\t\t\tqueryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {\n\t\t\t\tif( !slide.classList.contains( 'stack' ) ) {\n\t\t\t\t\tslide.addEventListener( 'click', this.onSlideClicked, true );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Calculate slide sizes\n\t\t\tconst margin = 70;\n\t\t\tconst slideSize = this.Reveal.getComputedSlideSize();\n\t\t\tthis.overviewSlideWidth = slideSize.width + margin;\n\t\t\tthis.overviewSlideHeight = slideSize.height + margin;\n\n\t\t\t// Reverse in RTL mode\n\t\t\tif( this.Reveal.getConfig().rtl ) {\n\t\t\t\tthis.overviewSlideWidth = -this.overviewSlideWidth;\n\t\t\t}\n\n\t\t\tthis.Reveal.updateSlidesVisibility();\n\n\t\t\tthis.layout();\n\t\t\tthis.update();\n\n\t\t\tthis.Reveal.layout();\n\n\t\t\tconst indices = this.Reveal.getIndices();\n\n\t\t\t// Notify observers of the overview showing\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'overviewshown',\n\t\t\t\tdata: {\n\t\t\t\t\t'indexh': indices.h,\n\t\t\t\t\t'indexv': indices.v,\n\t\t\t\t\t'currentSlide': this.Reveal.getCurrentSlide()\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Uses CSS transforms to position all slides in a grid for\n\t * display inside of the overview mode.\n\t */\n\tlayout() {\n\n\t\t// Layout slides\n\t\tthis.Reveal.getHorizontalSlides().forEach( ( hslide, h ) => {\n\t\t\thslide.setAttribute( 'data-index-h', h );\n\t\t\ttransformElement( hslide, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );\n\n\t\t\tif( hslide.classList.contains( 'stack' ) ) {\n\n\t\t\t\tqueryAll( hslide, 'section' ).forEach( ( vslide, v ) => {\n\t\t\t\t\tvslide.setAttribute( 'data-index-h', h );\n\t\t\t\t\tvslide.setAttribute( 'data-index-v', v );\n\n\t\t\t\t\ttransformElement( vslide, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );\n\t\t\t\t} );\n\n\t\t\t}\n\t\t} );\n\n\t\t// Layout slide backgrounds\n\t\tArray.from( this.Reveal.getBackgroundsElement().childNodes ).forEach( ( hbackground, h ) => {\n\t\t\ttransformElement( hbackground, 'translate3d(' + ( h * this.overviewSlideWidth ) + 'px, 0, 0)' );\n\n\t\t\tqueryAll( hbackground, '.slide-background' ).forEach( ( vbackground, v ) => {\n\t\t\t\ttransformElement( vbackground, 'translate3d(0, ' + ( v * this.overviewSlideHeight ) + 'px, 0)' );\n\t\t\t} );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Moves the overview viewport to the current slides.\n\t * Called each time the current slide changes.\n\t */\n\tupdate() {\n\n\t\tconst vmin = Math.min( window.innerWidth, window.innerHeight );\n\t\tconst scale = Math.max( vmin / 5, 150 ) / vmin;\n\t\tconst indices = this.Reveal.getIndices();\n\n\t\tthis.Reveal.transformSlides( {\n\t\t\toverview: [\n\t\t\t\t'scale('+ scale +')',\n\t\t\t\t'translateX('+ ( -indices.h * this.overviewSlideWidth ) +'px)',\n\t\t\t\t'translateY('+ ( -indices.v * this.overviewSlideHeight ) +'px)'\n\t\t\t].join( ' ' )\n\t\t} );\n\n\t}\n\n\t/**\n\t * Exits the slide overview and enters the currently\n\t * active slide.\n\t */\n\tdeactivate() {\n\n\t\t// Only proceed if enabled in config\n\t\tif( this.Reveal.getConfig().overview ) {\n\n\t\t\tthis.active = false;\n\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'overview' );\n\n\t\t\t// Temporarily add a class so that transitions can do different things\n\t\t\t// depending on whether they are exiting/entering overview, or just\n\t\t\t// moving from slide to slide\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'overview-deactivating' );\n\n\t\t\tsetTimeout( () => {\n\t\t\t\tthis.Reveal.getRevealElement().classList.remove( 'overview-deactivating' );\n\t\t\t}, 1 );\n\n\t\t\t// Move the background element back out\n\t\t\tthis.Reveal.getRevealElement().appendChild( this.Reveal.getBackgroundsElement() );\n\n\t\t\t// Clean up changes made to slides\n\t\t\tqueryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR ).forEach( slide => {\n\t\t\t\ttransformElement( slide, '' );\n\n\t\t\t\tslide.removeEventListener( 'click', this.onSlideClicked, true );\n\t\t\t} );\n\n\t\t\t// Clean up changes made to backgrounds\n\t\t\tqueryAll( this.Reveal.getBackgroundsElement(), '.slide-background' ).forEach( background => {\n\t\t\t\ttransformElement( background, '' );\n\t\t\t} );\n\n\t\t\tthis.Reveal.transformSlides( { overview: '' } );\n\n\t\t\tconst indices = this.Reveal.getIndices();\n\n\t\t\tthis.Reveal.slide( indices.h, indices.v );\n\t\t\tthis.Reveal.layout();\n\t\t\tthis.Reveal.cueAutoSlide();\n\n\t\t\t// Notify observers of the overview hiding\n\t\t\tthis.Reveal.dispatchEvent({\n\t\t\t\ttype: 'overviewhidden',\n\t\t\t\tdata: {\n\t\t\t\t\t'indexh': indices.h,\n\t\t\t\t\t'indexv': indices.v,\n\t\t\t\t\t'currentSlide': this.Reveal.getCurrentSlide()\n\t\t\t\t}\n\t\t\t});\n\n\t\t}\n\t}\n\n\t/**\n\t * Toggles the slide overview mode on and off.\n\t *\n\t * @param {Boolean} [override] Flag which overrides the\n\t * toggle logic and forcibly sets the desired state. True means\n\t * overview is open, false means it's closed.\n\t */\n\ttoggle( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? this.activate() : this.deactivate();\n\t\t}\n\t\telse {\n\t\t\tthis.isActive() ? this.deactivate() : this.activate();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if the overview is currently active.\n\t *\n\t * @return {Boolean} true if the overview is active,\n\t * false otherwise\n\t */\n\tisActive() {\n\n\t\treturn this.active;\n\n\t}\n\n\t/**\n\t * Invoked when a slide is and we're in the overview.\n\t *\n\t * @param {object} event\n\t */\n\tonSlideClicked( event ) {\n\n\t\tif( this.isActive() ) {\n\t\t\tevent.preventDefault();\n\n\t\t\tlet element = event.target;\n\n\t\t\twhile( element && !element.nodeName.match( /section/gi ) ) {\n\t\t\t\telement = element.parentNode;\n\t\t\t}\n\n\t\t\tif( element && !element.classList.contains( 'disabled' ) ) {\n\n\t\t\t\tthis.deactivate();\n\n\t\t\t\tif( element.nodeName.match( /section/gi ) ) {\n\t\t\t\t\tlet h = parseInt( element.getAttribute( 'data-index-h' ), 10 ),\n\t\t\t\t\t\tv = parseInt( element.getAttribute( 'data-index-v' ), 10 );\n\n\t\t\t\t\tthis.Reveal.slide( h, v );\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\n\t}\n\n}","import { enterFullscreen } from '../utils/util.js'\n\n/**\n * Handles all reveal.js keyboard interactions.\n */\nexport default class Keyboard {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// A key:value map of keyboard keys and descriptions of\n\t\t// the actions they trigger\n\t\tthis.shortcuts = {};\n\n\t\t// Holds custom key code mappings\n\t\tthis.bindings = {};\n\n\t\tthis.onDocumentKeyDown = this.onDocumentKeyDown.bind( this );\n\t\tthis.onDocumentKeyPress = this.onDocumentKeyPress.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.navigationMode === 'linear' ) {\n\t\t\tthis.shortcuts['&#8594;  ,  &#8595;  ,  SPACE  ,  N  ,  L  ,  J'] = 'Next slide';\n\t\t\tthis.shortcuts['&#8592;  ,  &#8593;  ,  P  ,  H  ,  K']           = 'Previous slide';\n\t\t}\n\t\telse {\n\t\t\tthis.shortcuts['N  ,  SPACE']   = 'Next slide';\n\t\t\tthis.shortcuts['P  ,  Shift SPACE']             = 'Previous slide';\n\t\t\tthis.shortcuts['&#8592;  ,  H'] = 'Navigate left';\n\t\t\tthis.shortcuts['&#8594;  ,  L'] = 'Navigate right';\n\t\t\tthis.shortcuts['&#8593;  ,  K'] = 'Navigate up';\n\t\t\tthis.shortcuts['&#8595;  ,  J'] = 'Navigate down';\n\t\t}\n\n\t\tthis.shortcuts['Alt + &#8592;/&#8593/&#8594;/&#8595;']        = 'Navigate without fragments';\n\t\tthis.shortcuts['Shift + &#8592;/&#8593/&#8594;/&#8595;']      = 'Jump to first/last slide';\n\t\tthis.shortcuts['B  ,  .']                       = 'Pause';\n\t\tthis.shortcuts['F']                             = 'Fullscreen';\n\t\tthis.shortcuts['ESC, O']                        = 'Slide overview';\n\n\t}\n\n\t/**\n\t * Starts listening for keyboard events.\n\t */\n\tbind() {\n\n\t\tdocument.addEventListener( 'keydown', this.onDocumentKeyDown, false );\n\t\tdocument.addEventListener( 'keypress', this.onDocumentKeyPress, false );\n\n\t}\n\n\t/**\n\t * Stops listening for keyboard events.\n\t */\n\tunbind() {\n\n\t\tdocument.removeEventListener( 'keydown', this.onDocumentKeyDown, false );\n\t\tdocument.removeEventListener( 'keypress', this.onDocumentKeyPress, false );\n\n\t}\n\n\t/**\n\t * Add a custom key binding with optional description to\n\t * be added to the help screen.\n\t */\n\taddKeyBinding( binding, callback ) {\n\n\t\tif( typeof binding === 'object' && binding.keyCode ) {\n\t\t\tthis.bindings[binding.keyCode] = {\n\t\t\t\tcallback: callback,\n\t\t\t\tkey: binding.key,\n\t\t\t\tdescription: binding.description\n\t\t\t};\n\t\t}\n\t\telse {\n\t\t\tthis.bindings[binding] = {\n\t\t\t\tcallback: callback,\n\t\t\t\tkey: null,\n\t\t\t\tdescription: null\n\t\t\t};\n\t\t}\n\n\t}\n\n\t/**\n\t * Removes the specified custom key binding.\n\t */\n\tremoveKeyBinding( keyCode ) {\n\n\t\tdelete this.bindings[keyCode];\n\n\t}\n\n\t/**\n\t * Programmatically triggers a keyboard event\n\t *\n\t * @param {int} keyCode\n\t */\n\ttriggerKey( keyCode ) {\n\n\t\tthis.onDocumentKeyDown( { keyCode } );\n\n\t}\n\n\t/**\n\t * Registers a new shortcut to include in the help overlay\n\t *\n\t * @param {String} key\n\t * @param {String} value\n\t */\n\tregisterKeyboardShortcut( key, value ) {\n\n\t\tthis.shortcuts[key] = value;\n\n\t}\n\n\tgetShortcuts() {\n\n\t\treturn this.shortcuts;\n\n\t}\n\n\tgetBindings() {\n\n\t\treturn this.bindings;\n\n\t}\n\n\t/**\n\t * Handler for the document level 'keypress' event.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentKeyPress( event ) {\n\n\t\t// Check if the pressed key is question mark\n\t\tif( event.shiftKey && event.charCode === 63 ) {\n\t\t\tthis.Reveal.toggleHelp();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the document level 'keydown' event.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentKeyDown( event ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\t// If there's a condition specified and it returns false,\n\t\t// ignore this event\n\t\tif( typeof config.keyboardCondition === 'function' && config.keyboardCondition(event) === false ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// If keyboardCondition is set, only capture keyboard events\n\t\t// for embedded decks when they are focused\n\t\tif( config.keyboardCondition === 'focused' && !this.Reveal.isFocused() ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Shorthand\n\t\tlet keyCode = event.keyCode;\n\n\t\t// Remember if auto-sliding was paused so we can toggle it\n\t\tlet autoSlideWasPaused = !this.Reveal.isAutoSliding();\n\n\t\tthis.Reveal.onUserInput( event );\n\n\t\t// Is there a focused element that could be using the keyboard?\n\t\tlet activeElementIsCE = document.activeElement && document.activeElement.isContentEditable === true;\n\t\tlet activeElementIsInput = document.activeElement && document.activeElement.tagName && /input|textarea/i.test( document.activeElement.tagName );\n\t\tlet activeElementIsNotes = document.activeElement && document.activeElement.className && /speaker-notes/i.test( document.activeElement.className);\n\n\t\t// Whitelist certain modifiers for slide navigation shortcuts\n\t\tlet isNavigationKey = [32, 37, 38, 39, 40, 78, 80].indexOf( event.keyCode ) !== -1;\n\n\t\t// Prevent all other events when a modifier is pressed\n\t\tlet unusedModifier = \t!( isNavigationKey && event.shiftKey || event.altKey ) &&\n\t\t\t\t\t\t\t\t( event.shiftKey || event.altKey || event.ctrlKey || event.metaKey );\n\n\t\t// Disregard the event if there's a focused element or a\n\t\t// keyboard modifier key is present\n\t\tif( activeElementIsCE || activeElementIsInput || activeElementIsNotes || unusedModifier ) return;\n\n\t\t// While paused only allow resume keyboard events; 'b', 'v', '.'\n\t\tlet resumeKeyCodes = [66,86,190,191];\n\t\tlet key;\n\n\t\t// Custom key bindings for togglePause should be able to resume\n\t\tif( typeof config.keyboard === 'object' ) {\n\t\t\tfor( key in config.keyboard ) {\n\t\t\t\tif( config.keyboard[key] === 'togglePause' ) {\n\t\t\t\t\tresumeKeyCodes.push( parseInt( key, 10 ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif( this.Reveal.isPaused() && resumeKeyCodes.indexOf( keyCode ) === -1 ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Use linear navigation if we're configured to OR if\n\t\t// the presentation is one-dimensional\n\t\tlet useLinearMode = config.navigationMode === 'linear' || !this.Reveal.hasHorizontalSlides() || !this.Reveal.hasVerticalSlides();\n\n\t\tlet triggered = false;\n\n\t\t// 1. User defined key bindings\n\t\tif( typeof config.keyboard === 'object' ) {\n\n\t\t\tfor( key in config.keyboard ) {\n\n\t\t\t\t// Check if this binding matches the pressed key\n\t\t\t\tif( parseInt( key, 10 ) === keyCode ) {\n\n\t\t\t\t\tlet value = config.keyboard[ key ];\n\n\t\t\t\t\t// Callback function\n\t\t\t\t\tif( typeof value === 'function' ) {\n\t\t\t\t\t\tvalue.apply( null, [ event ] );\n\t\t\t\t\t}\n\t\t\t\t\t// String shortcuts to reveal.js API\n\t\t\t\t\telse if( typeof value === 'string' && typeof this.Reveal[ value ] === 'function' ) {\n\t\t\t\t\t\tthis.Reveal[ value ].call();\n\t\t\t\t\t}\n\n\t\t\t\t\ttriggered = true;\n\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t// 2. Registered custom key bindings\n\t\tif( triggered === false ) {\n\n\t\t\tfor( key in this.bindings ) {\n\n\t\t\t\t// Check if this binding matches the pressed key\n\t\t\t\tif( parseInt( key, 10 ) === keyCode ) {\n\n\t\t\t\t\tlet action = this.bindings[ key ].callback;\n\n\t\t\t\t\t// Callback function\n\t\t\t\t\tif( typeof action === 'function' ) {\n\t\t\t\t\t\taction.apply( null, [ event ] );\n\t\t\t\t\t}\n\t\t\t\t\t// String shortcuts to reveal.js API\n\t\t\t\t\telse if( typeof action === 'string' && typeof this.Reveal[ action ] === 'function' ) {\n\t\t\t\t\t\tthis.Reveal[ action ].call();\n\t\t\t\t\t}\n\n\t\t\t\t\ttriggered = true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// 3. System defined key bindings\n\t\tif( triggered === false ) {\n\n\t\t\t// Assume true and try to prove false\n\t\t\ttriggered = true;\n\n\t\t\t// P, PAGE UP\n\t\t\tif( keyCode === 80 || keyCode === 33 ) {\n\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t}\n\t\t\t// N, PAGE DOWN\n\t\t\telse if( keyCode === 78 || keyCode === 34 ) {\n\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t}\n\t\t\t// H, LEFT\n\t\t\telse if( keyCode === 72 || keyCode === 37 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( 0 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.left({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// L, RIGHT\n\t\t\telse if( keyCode === 76 || keyCode === 39 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.right({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// K, UP\n\t\t\telse if( keyCode === 75 || keyCode === 38 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( undefined, 0 );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.up({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// J, DOWN\n\t\t\telse if( keyCode === 74 || keyCode === 40 ) {\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.slide( undefined, Number.MAX_VALUE );\n\t\t\t\t}\n\t\t\t\telse if( !this.Reveal.overview.isActive() && useLinearMode ) {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.down({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// HOME\n\t\t\telse if( keyCode === 36 ) {\n\t\t\t\tthis.Reveal.slide( 0 );\n\t\t\t}\n\t\t\t// END\n\t\t\telse if( keyCode === 35 ) {\n\t\t\t\tthis.Reveal.slide( this.Reveal.getHorizontalSlides().length - 1 );\n\t\t\t}\n\t\t\t// SPACE\n\t\t\telse if( keyCode === 32 ) {\n\t\t\t\tif( this.Reveal.overview.isActive() ) {\n\t\t\t\t\tthis.Reveal.overview.deactivate();\n\t\t\t\t}\n\t\t\t\tif( event.shiftKey ) {\n\t\t\t\t\tthis.Reveal.prev({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.Reveal.next({skipFragments: event.altKey});\n\t\t\t\t}\n\t\t\t}\n\t\t\t// TWO-SPOT, SEMICOLON, B, V, PERIOD, LOGITECH PRESENTER TOOLS \"BLACK SCREEN\" BUTTON\n\t\t\telse if( keyCode === 58 || keyCode === 59 || keyCode === 66 || keyCode === 86 || keyCode === 190 || keyCode === 191 ) {\n\t\t\t\tthis.Reveal.togglePause();\n\t\t\t}\n\t\t\t// F\n\t\t\telse if( keyCode === 70 ) {\n\t\t\t\tenterFullscreen( config.embedded ? this.Reveal.getViewportElement() : document.documentElement );\n\t\t\t}\n\t\t\t// A\n\t\t\telse if( keyCode === 65 ) {\n\t\t\t\tif ( config.autoSlideStoppable ) {\n\t\t\t\t\tthis.Reveal.toggleAutoSlide( autoSlideWasPaused );\n\t\t\t\t}\n\t\t\t}\n\t\t\telse {\n\t\t\t\ttriggered = false;\n\t\t\t}\n\n\t\t}\n\n\t\t// If the input resulted in a triggered action we should prevent\n\t\t// the browsers default behavior\n\t\tif( triggered ) {\n\t\t\tevent.preventDefault && event.preventDefault();\n\t\t}\n\t\t// ESC or O key\n\t\telse if( keyCode === 27 || keyCode === 79 ) {\n\t\t\tif( this.Reveal.closeOverlay() === false ) {\n\t\t\t\tthis.Reveal.overview.toggle();\n\t\t\t}\n\n\t\t\tevent.preventDefault && event.preventDefault();\n\t\t}\n\n\t\t// If auto-sliding is enabled we need to cue up\n\t\t// another timeout\n\t\tthis.Reveal.cueAutoSlide();\n\n\t}\n\n}","/**\n * Reads and writes the URL based on reveal.js' current state.\n */\nexport default class Location {\n\n\t// The minimum number of milliseconds that must pass between\n\t// calls to history.replaceState\n\tMAX_REPLACE_STATE_FREQUENCY = 1000\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Delays updates to the URL due to a Chrome thumbnailer bug\n\t\tthis.writeURLTimeout = 0;\n\n\t\tthis.replaceStateTimestamp = 0;\n\n\t\tthis.onWindowHashChange = this.onWindowHashChange.bind( this );\n\n\t}\n\n\tbind() {\n\n\t\twindow.addEventListener( 'hashchange', this.onWindowHashChange, false );\n\n\t}\n\n\tunbind() {\n\n\t\twindow.removeEventListener( 'hashchange', this.onWindowHashChange, false );\n\n\t}\n\n\t/**\n\t * Returns the slide indices for the given hash link.\n\t *\n\t * @param {string} [hash] the hash string that we want to\n\t * find the indices for\n\t *\n\t * @returns slide indices or null\n\t */\n\tgetIndicesFromHash( hash=window.location.hash ) {\n\n\t\t// Attempt to parse the hash as either an index or name\n\t\tlet name = hash.replace( /^#\\/?/, '' );\n\t\tlet bits = name.split( '/' );\n\n\t\t// If the first bit is not fully numeric and there is a name we\n\t\t// can assume that this is a named link\n\t\tif( !/^[0-9]*$/.test( bits[0] ) && name.length ) {\n\t\t\tlet element;\n\n\t\t\tlet f;\n\n\t\t\t// Parse named links with fragments (#/named-link/2)\n\t\t\tif( /\\/[-\\d]+$/g.test( name ) ) {\n\t\t\t\tf = parseInt( name.split( '/' ).pop(), 10 );\n\t\t\t\tf = isNaN(f) ? undefined : f;\n\t\t\t\tname = name.split( '/' ).shift();\n\t\t\t}\n\n\t\t\t// Ensure the named link is a valid HTML ID attribute\n\t\t\ttry {\n\t\t\t\telement = document.getElementById( decodeURIComponent( name ) );\n\t\t\t}\n\t\t\tcatch ( error ) { }\n\n\t\t\tif( element ) {\n\t\t\t\treturn { ...this.Reveal.getIndices( element ), f };\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tconst config = this.Reveal.getConfig();\n\t\t\tlet hashIndexBase = config.hashOneBasedIndex ? 1 : 0;\n\n\t\t\t// Read the index components of the hash\n\t\t\tlet h = ( parseInt( bits[0], 10 ) - hashIndexBase ) || 0,\n\t\t\t\tv = ( parseInt( bits[1], 10 ) - hashIndexBase ) || 0,\n\t\t\t\tf;\n\n\t\t\tif( config.fragmentInURL ) {\n\t\t\t\tf = parseInt( bits[2], 10 );\n\t\t\t\tif( isNaN( f ) ) {\n\t\t\t\t\tf = undefined;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn { h, v, f };\n\t\t}\n\n\t\t// The hash couldn't be parsed or no matching named link was found\n\t\treturn null\n\n\t}\n\n\t/**\n\t * Reads the current URL (hash) and navigates accordingly.\n\t */\n\treadURL() {\n\n\t\tconst currentIndices = this.Reveal.getIndices();\n\t\tconst newIndices = this.getIndicesFromHash();\n\n\t\tif( newIndices ) {\n\t\t\tif( ( newIndices.h !== currentIndices.h || newIndices.v !== currentIndices.v || newIndices.f !== undefined ) ) {\n\t\t\t\t\tthis.Reveal.slide( newIndices.h, newIndices.v, newIndices.f );\n\t\t\t}\n\t\t}\n\t\t// If no new indices are available, we're trying to navigate to\n\t\t// a slide hash that does not exist\n\t\telse {\n\t\t\tthis.Reveal.slide( currentIndices.h || 0, currentIndices.v || 0 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the page URL (hash) to reflect the current\n\t * state.\n\t *\n\t * @param {number} delay The time in ms to wait before\n\t * writing the hash\n\t */\n\twriteURL( delay ) {\n\n\t\tlet config = this.Reveal.getConfig();\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\n\t\t// Make sure there's never more than one timeout running\n\t\tclearTimeout( this.writeURLTimeout );\n\n\t\t// If a delay is specified, timeout this call\n\t\tif( typeof delay === 'number' ) {\n\t\t\tthis.writeURLTimeout = setTimeout( this.writeURL, delay );\n\t\t}\n\t\telse if( currentSlide ) {\n\n\t\t\tlet hash = this.getHash();\n\n\t\t\t// If we're configured to push to history OR the history\n\t\t\t// API is not avaialble.\n\t\t\tif( config.history ) {\n\t\t\t\twindow.location.hash = hash;\n\t\t\t}\n\t\t\t// If we're configured to reflect the current slide in the\n\t\t\t// URL without pushing to history.\n\t\t\telse if( config.hash ) {\n\t\t\t\t// If the hash is empty, don't add it to the URL\n\t\t\t\tif( hash === '/' ) {\n\t\t\t\t\tthis.debouncedReplaceState( window.location.pathname + window.location.search );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.debouncedReplaceState( '#' + hash );\n\t\t\t\t}\n\t\t\t}\n\t\t\t// UPDATE: The below nuking of all hash changes breaks\n\t\t\t// anchors on pages where reveal.js is running. Removed\n\t\t\t// in 4.0. Why was it here in the first place? ¯\\_(ツ)_/¯\n\t\t\t//\n\t\t\t// If history and hash are both disabled, a hash may still\n\t\t\t// be added to the URL by clicking on a href with a hash\n\t\t\t// target. Counter this by always removing the hash.\n\t\t\t// else {\n\t\t\t// \twindow.history.replaceState( null, null, window.location.pathname + window.location.search );\n\t\t\t// }\n\n\t\t}\n\n\t}\n\n\treplaceState( url ) {\n\n\t\twindow.history.replaceState( null, null, url );\n\t\tthis.replaceStateTimestamp = Date.now();\n\n\t}\n\n\tdebouncedReplaceState( url ) {\n\n\t\tclearTimeout( this.replaceStateTimeout );\n\n\t\tif( Date.now() - this.replaceStateTimestamp > this.MAX_REPLACE_STATE_FREQUENCY ) {\n\t\t\tthis.replaceState( url );\n\t\t}\n\t\telse {\n\t\t\tthis.replaceStateTimeout = setTimeout( () => this.replaceState( url ), this.MAX_REPLACE_STATE_FREQUENCY );\n\t\t}\n\n\t}\n\n\t/**\n\t * Return a hash URL that will resolve to the given slide location.\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide to link to\n\t */\n\tgetHash( slide ) {\n\n\t\tlet url = '/';\n\n\t\t// Attempt to create a named link based on the slide's ID\n\t\tlet s = slide || this.Reveal.getCurrentSlide();\n\t\tlet id = s ? s.getAttribute( 'id' ) : null;\n\t\tif( id ) {\n\t\t\tid = encodeURIComponent( id );\n\t\t}\n\n\t\tlet index = this.Reveal.getIndices( slide );\n\t\tif( !this.Reveal.getConfig().fragmentInURL ) {\n\t\t\tindex.f = undefined;\n\t\t}\n\n\t\t// If the current slide has an ID, use that as a named link,\n\t\t// but we don't support named links with a fragment index\n\t\tif( typeof id === 'string' && id.length ) {\n\t\t\turl = '/' + id;\n\n\t\t\t// If there is also a fragment, append that at the end\n\t\t\t// of the named link, like: #/named-link/2\n\t\t\tif( index.f >= 0 ) url += '/' + index.f;\n\t\t}\n\t\t// Otherwise use the /h/v index\n\t\telse {\n\t\t\tlet hashIndexBase = this.Reveal.getConfig().hashOneBasedIndex ? 1 : 0;\n\t\t\tif( index.h > 0 || index.v > 0 || index.f >= 0 ) url += index.h + hashIndexBase;\n\t\t\tif( index.v > 0 || index.f >= 0 ) url += '/' + (index.v + hashIndexBase );\n\t\t\tif( index.f >= 0 ) url += '/' + index.f;\n\t\t}\n\n\t\treturn url;\n\n\t}\n\n\t/**\n\t * Handler for the window level 'hashchange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tonWindowHashChange( event ) {\n\n\t\tthis.readURL();\n\n\t}\n\n}","import { queryAll } from '../utils/util.js'\nimport { isAndroid } from '../utils/device.js'\n\n/**\n * Manages our presentation controls. This includes both\n * the built-in control arrows as well as event monitoring\n * of any elements within the presentation with either of the\n * following helper classes:\n * - .navigate-up\n * - .navigate-right\n * - .navigate-down\n * - .navigate-left\n * - .navigate-next\n * - .navigate-prev\n */\nexport default class Controls {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onNavigateLeftClicked = this.onNavigateLeftClicked.bind( this );\n\t\tthis.onNavigateRightClicked = this.onNavigateRightClicked.bind( this );\n\t\tthis.onNavigateUpClicked = this.onNavigateUpClicked.bind( this );\n\t\tthis.onNavigateDownClicked = this.onNavigateDownClicked.bind( this );\n\t\tthis.onNavigatePrevClicked = this.onNavigatePrevClicked.bind( this );\n\t\tthis.onNavigateNextClicked = this.onNavigateNextClicked.bind( this );\n\n\t}\n\n\trender() {\n\n\t\tconst rtl = this.Reveal.getConfig().rtl;\n\t\tconst revealElement = this.Reveal.getRevealElement();\n\n\t\tthis.element = document.createElement( 'aside' );\n\t\tthis.element.className = 'controls';\n\t\tthis.element.innerHTML =\n\t\t\t`<button class=\"navigate-left\" aria-label=\"${ rtl ? 'next slide' : 'previous slide' }\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-right\" aria-label=\"${ rtl ? 'previous slide' : 'next slide' }\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-up\" aria-label=\"above slide\"><div class=\"controls-arrow\"></div></button>\n\t\t\t<button class=\"navigate-down\" aria-label=\"below slide\"><div class=\"controls-arrow\"></div></button>`;\n\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t\t// There can be multiple instances of controls throughout the page\n\t\tthis.controlsLeft = queryAll( revealElement, '.navigate-left' );\n\t\tthis.controlsRight = queryAll( revealElement, '.navigate-right' );\n\t\tthis.controlsUp = queryAll( revealElement, '.navigate-up' );\n\t\tthis.controlsDown = queryAll( revealElement, '.navigate-down' );\n\t\tthis.controlsPrev = queryAll( revealElement, '.navigate-prev' );\n\t\tthis.controlsNext = queryAll( revealElement, '.navigate-next' );\n\n\t\t// The left, right and down arrows in the standard reveal.js controls\n\t\tthis.controlsRightArrow = this.element.querySelector( '.navigate-right' );\n\t\tthis.controlsLeftArrow = this.element.querySelector( '.navigate-left' );\n\t\tthis.controlsDownArrow = this.element.querySelector( '.navigate-down' );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tthis.element.style.display = config.controls ? 'block' : 'none';\n\n\t\tthis.element.setAttribute( 'data-controls-layout', config.controlsLayout );\n\t\tthis.element.setAttribute( 'data-controls-back-arrows', config.controlsBackArrows );\n\n\t}\n\n\tbind() {\n\n\t\t// Listen to both touch and click events, in case the device\n\t\t// supports both\n\t\tlet pointerEvents = [ 'touchstart', 'click' ];\n\n\t\t// Only support touch for Android, fixes double navigations in\n\t\t// stock browser\n\t\tif( isAndroid ) {\n\t\t\tpointerEvents = [ 'touchstart' ];\n\t\t}\n\n\t\tpointerEvents.forEach( eventName => {\n\t\t\tthis.controlsLeft.forEach( el => el.addEventListener( eventName, this.onNavigateLeftClicked, false ) );\n\t\t\tthis.controlsRight.forEach( el => el.addEventListener( eventName, this.onNavigateRightClicked, false ) );\n\t\t\tthis.controlsUp.forEach( el => el.addEventListener( eventName, this.onNavigateUpClicked, false ) );\n\t\t\tthis.controlsDown.forEach( el => el.addEventListener( eventName, this.onNavigateDownClicked, false ) );\n\t\t\tthis.controlsPrev.forEach( el => el.addEventListener( eventName, this.onNavigatePrevClicked, false ) );\n\t\t\tthis.controlsNext.forEach( el => el.addEventListener( eventName, this.onNavigateNextClicked, false ) );\n\t\t} );\n\n\t}\n\n\tunbind() {\n\n\t\t[ 'touchstart', 'click' ].forEach( eventName => {\n\t\t\tthis.controlsLeft.forEach( el => el.removeEventListener( eventName, this.onNavigateLeftClicked, false ) );\n\t\t\tthis.controlsRight.forEach( el => el.removeEventListener( eventName, this.onNavigateRightClicked, false ) );\n\t\t\tthis.controlsUp.forEach( el => el.removeEventListener( eventName, this.onNavigateUpClicked, false ) );\n\t\t\tthis.controlsDown.forEach( el => el.removeEventListener( eventName, this.onNavigateDownClicked, false ) );\n\t\t\tthis.controlsPrev.forEach( el => el.removeEventListener( eventName, this.onNavigatePrevClicked, false ) );\n\t\t\tthis.controlsNext.forEach( el => el.removeEventListener( eventName, this.onNavigateNextClicked, false ) );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Updates the state of all control/navigation arrows.\n\t */\n\tupdate() {\n\n\t\tlet routes = this.Reveal.availableRoutes();\n\n\t\t// Remove the 'enabled' class from all directions\n\t\t[...this.controlsLeft, ...this.controlsRight, ...this.controlsUp, ...this.controlsDown, ...this.controlsPrev, ...this.controlsNext].forEach( node => {\n\t\t\tnode.classList.remove( 'enabled', 'fragmented' );\n\n\t\t\t// Set 'disabled' attribute on all directions\n\t\t\tnode.setAttribute( 'disabled', 'disabled' );\n\t\t} );\n\n\t\t// Add the 'enabled' class to the available routes; remove 'disabled' attribute to enable buttons\n\t\tif( routes.left ) this.controlsLeft.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.right ) this.controlsRight.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.up ) this.controlsUp.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.down ) this.controlsDown.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t// Prev/next buttons\n\t\tif( routes.left || routes.up ) this.controlsPrev.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\tif( routes.right || routes.down ) this.controlsNext.forEach( el => { el.classList.add( 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t// Highlight fragment directions\n\t\tlet currentSlide = this.Reveal.getCurrentSlide();\n\t\tif( currentSlide ) {\n\n\t\t\tlet fragmentsRoutes = this.Reveal.fragments.availableRoutes();\n\n\t\t\t// Always apply fragment decorator to prev/next buttons\n\t\t\tif( fragmentsRoutes.prev ) this.controlsPrev.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\tif( fragmentsRoutes.next ) this.controlsNext.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\n\t\t\t// Apply fragment decorators to directional buttons based on\n\t\t\t// what slide axis they are in\n\t\t\tif( this.Reveal.isVerticalSlide( currentSlide ) ) {\n\t\t\t\tif( fragmentsRoutes.prev ) this.controlsUp.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t\tif( fragmentsRoutes.next ) this.controlsDown.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tif( fragmentsRoutes.prev ) this.controlsLeft.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t\tif( fragmentsRoutes.next ) this.controlsRight.forEach( el => { el.classList.add( 'fragmented', 'enabled' ); el.removeAttribute( 'disabled' ); } );\n\t\t\t}\n\n\t\t}\n\n\t\tif( this.Reveal.getConfig().controlsTutorial ) {\n\n\t\t\tlet indices = this.Reveal.getIndices();\n\n\t\t\t// Highlight control arrows with an animation to ensure\n\t\t\t// that the viewer knows how to navigate\n\t\t\tif( !this.Reveal.hasNavigatedVertically() && routes.down ) {\n\t\t\t\tthis.controlsDownArrow.classList.add( 'highlight' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.controlsDownArrow.classList.remove( 'highlight' );\n\n\t\t\t\tif( this.Reveal.getConfig().rtl ) {\n\n\t\t\t\t\tif( !this.Reveal.hasNavigatedHorizontally() && routes.left && indices.v === 0 ) {\n\t\t\t\t\t\tthis.controlsLeftArrow.classList.add( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.controlsLeftArrow.classList.remove( 'highlight' );\n\t\t\t\t\t}\n\n\t\t\t\t} else {\n\n\t\t\t\t\tif( !this.Reveal.hasNavigatedHorizontally() && routes.right && indices.v === 0 ) {\n\t\t\t\t\t\tthis.controlsRightArrow.classList.add( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.controlsRightArrow.classList.remove( 'highlight' );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tdestroy() {\n\n\t\tthis.unbind();\n\t\tthis.element.remove();\n\n\t}\n\n\t/**\n\t * Event handlers for navigation control buttons.\n\t */\n\tonNavigateLeftClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tif( this.Reveal.getConfig().navigationMode === 'linear' ) {\n\t\t\tthis.Reveal.prev();\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.left();\n\t\t}\n\n\t}\n\n\tonNavigateRightClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tif( this.Reveal.getConfig().navigationMode === 'linear' ) {\n\t\t\tthis.Reveal.next();\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.right();\n\t\t}\n\n\t}\n\n\tonNavigateUpClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.up();\n\n\t}\n\n\tonNavigateDownClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.down();\n\n\t}\n\n\tonNavigatePrevClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.prev();\n\n\t}\n\n\tonNavigateNextClicked( event ) {\n\n\t\tevent.preventDefault();\n\t\tthis.Reveal.onUserInput();\n\n\t\tthis.Reveal.next();\n\n\t}\n\n\n}","/**\n * Creates a visual progress bar for the presentation.\n */\nexport default class Progress {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onProgressClicked = this.onProgressClicked.bind( this );\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'progress';\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t\tthis.bar = document.createElement( 'span' );\n\t\tthis.element.appendChild( this.bar );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tthis.element.style.display = config.progress ? 'block' : 'none';\n\n\t}\n\n\tbind() {\n\n\t\tif( this.Reveal.getConfig().progress && this.element ) {\n\t\t\tthis.element.addEventListener( 'click', this.onProgressClicked, false );\n\t\t}\n\n\t}\n\n\tunbind() {\n\n\t\tif ( this.Reveal.getConfig().progress && this.element ) {\n\t\t\tthis.element.removeEventListener( 'click', this.onProgressClicked, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the progress bar to reflect the current slide.\n\t */\n\tupdate() {\n\n\t\t// Update progress if enabled\n\t\tif( this.Reveal.getConfig().progress && this.bar ) {\n\n\t\t\tlet scale = this.Reveal.getProgress();\n\n\t\t\t// Don't fill the progress bar if there's only one slide\n\t\t\tif( this.Reveal.getTotalSlides() < 2 ) {\n\t\t\t\tscale = 0;\n\t\t\t}\n\n\t\t\tthis.bar.style.transform = 'scaleX('+ scale +')';\n\n\t\t}\n\n\t}\n\n\tgetMaxWidth() {\n\n\t\treturn this.Reveal.getRevealElement().offsetWidth;\n\n\t}\n\n\t/**\n\t * Clicking on the progress bar results in a navigation to the\n\t * closest approximate horizontal slide using this equation:\n\t *\n\t * ( clickX / presentationWidth ) * numberOfSlides\n\t *\n\t * @param {object} event\n\t */\n\tonProgressClicked( event ) {\n\n\t\tthis.Reveal.onUserInput( event );\n\n\t\tevent.preventDefault();\n\n\t\tlet slides = this.Reveal.getSlides();\n\t\tlet slidesTotal = slides.length;\n\t\tlet slideIndex = Math.floor( ( event.clientX / this.getMaxWidth() ) * slidesTotal );\n\n\t\tif( this.Reveal.getConfig().rtl ) {\n\t\t\tslideIndex = slidesTotal - slideIndex;\n\t\t}\n\n\t\tlet targetIndices = this.Reveal.getIndices(slides[slideIndex]);\n\t\tthis.Reveal.slide( targetIndices.h, targetIndices.v );\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","/**\n * Handles hiding of the pointer/cursor when inactive.\n */\nexport default class Pointer {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Throttles mouse wheel navigation\n\t\tthis.lastMouseWheelStep = 0;\n\n\t\t// Is the mouse pointer currently hidden from view\n\t\tthis.cursorHidden = false;\n\n\t\t// Timeout used to determine when the cursor is inactive\n\t\tthis.cursorInactiveTimeout = 0;\n\n\t\tthis.onDocumentCursorActive = this.onDocumentCursorActive.bind( this );\n\t\tthis.onDocumentMouseScroll = this.onDocumentMouseScroll.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.mouseWheel ) {\n\t\t\tdocument.addEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF\n\t\t\tdocument.addEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\t}\n\t\telse {\n\t\t\tdocument.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false ); // FF\n\t\t\tdocument.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\t}\n\n\t\t// Auto-hide the mouse pointer when its inactive\n\t\tif( config.hideInactiveCursor ) {\n\t\t\tdocument.addEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\t\tdocument.addEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\t\t}\n\t\telse {\n\t\t\tthis.showCursor();\n\n\t\t\tdocument.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\t\tdocument.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Shows the mouse pointer after it has been hidden with\n\t * #hideCursor.\n\t */\n\tshowCursor() {\n\n\t\tif( this.cursorHidden ) {\n\t\t\tthis.cursorHidden = false;\n\t\t\tthis.Reveal.getRevealElement().style.cursor = '';\n\t\t}\n\n\t}\n\n\t/**\n\t * Hides the mouse pointer when it's on top of the .reveal\n\t * container.\n\t */\n\thideCursor() {\n\n\t\tif( this.cursorHidden === false ) {\n\t\t\tthis.cursorHidden = true;\n\t\t\tthis.Reveal.getRevealElement().style.cursor = 'none';\n\t\t}\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.showCursor();\n\n\t\tdocument.removeEventListener( 'DOMMouseScroll', this.onDocumentMouseScroll, false );\n\t\tdocument.removeEventListener( 'mousewheel', this.onDocumentMouseScroll, false );\n\t\tdocument.removeEventListener( 'mousemove', this.onDocumentCursorActive, false );\n\t\tdocument.removeEventListener( 'mousedown', this.onDocumentCursorActive, false );\n\n\t}\n\n\t/**\n\t * Called whenever there is mouse input at the document level\n\t * to determine if the cursor is active or not.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentCursorActive( event ) {\n\n\t\tthis.showCursor();\n\n\t\tclearTimeout( this.cursorInactiveTimeout );\n\n\t\tthis.cursorInactiveTimeout = setTimeout( this.hideCursor.bind( this ), this.Reveal.getConfig().hideCursorTime );\n\n\t}\n\n\t/**\n\t * Handles mouse wheel scrolling, throttled to avoid skipping\n\t * multiple slides.\n\t *\n\t * @param {object} event\n\t */\n\tonDocumentMouseScroll( event ) {\n\n\t\tif( Date.now() - this.lastMouseWheelStep > 1000 ) {\n\n\t\t\tthis.lastMouseWheelStep = Date.now();\n\n\t\t\tlet delta = event.detail || -event.wheelDelta;\n\t\t\tif( delta > 0 ) {\n\t\t\t\tthis.Reveal.next();\n\t\t\t}\n\t\t\telse if( delta < 0 ) {\n\t\t\t\tthis.Reveal.prev();\n\t\t\t}\n\n\t\t}\n\n\t}\n\n}","var DESCRIPTORS = require('../internals/descriptors');\nvar objectKeys = require('../internals/object-keys');\nvar toIndexedObject = require('../internals/to-indexed-object');\nvar propertyIsEnumerable = require('../internals/object-property-is-enumerable').f;\n\n// `Object.{ entries, values }` methods implementation\nvar createMethod = function (TO_ENTRIES) {\n  return function (it) {\n    var O = toIndexedObject(it);\n    var keys = objectKeys(O);\n    var length = keys.length;\n    var i = 0;\n    var result = [];\n    var key;\n    while (length > i) {\n      key = keys[i++];\n      if (!DESCRIPTORS || propertyIsEnumerable.call(O, key)) {\n        result.push(TO_ENTRIES ? [key, O[key]] : O[key]);\n      }\n    }\n    return result;\n  };\n};\n\nmodule.exports = {\n  // `Object.entries` method\n  // https://tc39.es/ecma262/#sec-object.entries\n  entries: createMethod(true),\n  // `Object.values` method\n  // https://tc39.es/ecma262/#sec-object.values\n  values: createMethod(false)\n};\n","var $ = require('../internals/export');\nvar $values = require('../internals/object-to-array').values;\n\n// `Object.values` method\n// https://tc39.es/ecma262/#sec-object.values\n$({ target: 'Object', stat: true }, {\n  values: function values(O) {\n    return $values(O);\n  }\n});\n","/**\n * Loads a JavaScript file from the given URL and executes it.\n *\n * @param {string} url Address of the .js file to load\n * @param {function} callback Method to invoke when the script\n * has loaded and executed\n */\nexport const loadScript = ( url, callback ) => {\n\n\tconst script = document.createElement( 'script' );\n\tscript.type = 'text/javascript';\n\tscript.async = false;\n\tscript.defer = false;\n\tscript.src = url;\n\n\tif( typeof callback === 'function' ) {\n\n\t\t// Success callback\n\t\tscript.onload = script.onreadystatechange = event => {\n\t\t\tif( event.type === 'load' || /loaded|complete/.test( script.readyState ) ) {\n\n\t\t\t\t// Kill event listeners\n\t\t\t\tscript.onload = script.onreadystatechange = script.onerror = null;\n\n\t\t\t\tcallback();\n\n\t\t\t}\n\t\t};\n\n\t\t// Error callback\n\t\tscript.onerror = err => {\n\n\t\t\t// Kill event listeners\n\t\t\tscript.onload = script.onreadystatechange = script.onerror = null;\n\n\t\t\tcallback( new Error( 'Failed loading script: ' + script.src + '\\n' + err ) );\n\n\t\t};\n\n\t}\n\n\t// Append the script at the end of <head>\n\tconst head = document.querySelector( 'head' );\n\thead.insertBefore( script, head.lastChild );\n\n}","import { loadScript } from '../utils/loader.js'\n\n/**\n * Manages loading and registering of reveal.js plugins.\n */\nexport default class Plugins {\n\n\tconstructor( reveal ) {\n\n\t\tthis.Reveal = reveal;\n\n\t\t// Flags our current state (idle -> loading -> loaded)\n\t\tthis.state = 'idle';\n\n\t\t// An id:instance map of currently registed plugins\n\t\tthis.registeredPlugins = {};\n\n\t\tthis.asyncDependencies = [];\n\n\t}\n\n\t/**\n\t * Loads reveal.js dependencies, registers and\n\t * initializes plugins.\n\t *\n\t * Plugins are direct references to a reveal.js plugin\n\t * object that we register and initialize after any\n\t * synchronous dependencies have loaded.\n\t *\n\t * Dependencies are defined via the 'dependencies' config\n\t * option and will be loaded prior to starting reveal.js.\n\t * Some dependencies may have an 'async' flag, if so they\n\t * will load after reveal.js has been started up.\n\t */\n\tload( plugins, dependencies ) {\n\n\t\tthis.state = 'loading';\n\n\t\tplugins.forEach( this.registerPlugin.bind( this ) );\n\n\t\treturn new Promise( resolve => {\n\n\t\t\tlet scripts = [],\n\t\t\t\tscriptsToLoad = 0;\n\n\t\t\tdependencies.forEach( s => {\n\t\t\t\t// Load if there's no condition or the condition is truthy\n\t\t\t\tif( !s.condition || s.condition() ) {\n\t\t\t\t\tif( s.async ) {\n\t\t\t\t\t\tthis.asyncDependencies.push( s );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tscripts.push( s );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tif( scripts.length ) {\n\t\t\t\tscriptsToLoad = scripts.length;\n\n\t\t\t\tconst scriptLoadedCallback = (s) => {\n\t\t\t\t\tif( s && typeof s.callback === 'function' ) s.callback();\n\n\t\t\t\t\tif( --scriptsToLoad === 0 ) {\n\t\t\t\t\t\tthis.initPlugins().then( resolve );\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\t// Load synchronous scripts\n\t\t\t\tscripts.forEach( s => {\n\t\t\t\t\tif( typeof s.id === 'string' ) {\n\t\t\t\t\t\tthis.registerPlugin( s );\n\t\t\t\t\t\tscriptLoadedCallback( s );\n\t\t\t\t\t}\n\t\t\t\t\telse if( typeof s.src === 'string' ) {\n\t\t\t\t\t\tloadScript( s.src, () => scriptLoadedCallback(s) );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tconsole.warn( 'Unrecognized plugin format', s );\n\t\t\t\t\t\tscriptLoadedCallback();\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.initPlugins().then( resolve );\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Initializes our plugins and waits for them to be ready\n\t * before proceeding.\n\t */\n\tinitPlugins() {\n\n\t\treturn new Promise( resolve => {\n\n\t\t\tlet pluginValues = Object.values( this.registeredPlugins );\n\t\t\tlet pluginsToInitialize = pluginValues.length;\n\n\t\t\t// If there are no plugins, skip this step\n\t\t\tif( pluginsToInitialize === 0 ) {\n\t\t\t\tthis.loadAsync().then( resolve );\n\t\t\t}\n\t\t\t// ... otherwise initialize plugins\n\t\t\telse {\n\n\t\t\t\tlet initNextPlugin;\n\n\t\t\t\tlet afterPlugInitialized = () => {\n\t\t\t\t\tif( --pluginsToInitialize === 0 ) {\n\t\t\t\t\t\tthis.loadAsync().then( resolve );\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tinitNextPlugin();\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\tlet i = 0;\n\n\t\t\t\t// Initialize plugins serially\n\t\t\t\tinitNextPlugin = () => {\n\n\t\t\t\t\tlet plugin = pluginValues[i++];\n\n\t\t\t\t\t// If the plugin has an 'init' method, invoke it\n\t\t\t\t\tif( typeof plugin.init === 'function' ) {\n\t\t\t\t\t\tlet promise = plugin.init( this.Reveal );\n\n\t\t\t\t\t\t// If the plugin returned a Promise, wait for it\n\t\t\t\t\t\tif( promise && typeof promise.then === 'function' ) {\n\t\t\t\t\t\t\tpromise.then( afterPlugInitialized );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tafterPlugInitialized();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tafterPlugInitialized();\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tinitNextPlugin();\n\n\t\t\t}\n\n\t\t} )\n\n\t}\n\n\t/**\n\t * Loads all async reveal.js dependencies.\n\t */\n\tloadAsync() {\n\n\t\tthis.state = 'loaded';\n\n\t\tif( this.asyncDependencies.length ) {\n\t\t\tthis.asyncDependencies.forEach( s => {\n\t\t\t\tloadScript( s.src, s.callback );\n\t\t\t} );\n\t\t}\n\n\t\treturn Promise.resolve();\n\n\t}\n\n\t/**\n\t * Registers a new plugin with this reveal.js instance.\n\t *\n\t * reveal.js waits for all regisered plugins to initialize\n\t * before considering itself ready, as long as the plugin\n\t * is registered before calling `Reveal.initialize()`.\n\t */\n\tregisterPlugin( plugin ) {\n\n\t\t// Backwards compatibility to make reveal.js ~3.9.0\n\t\t// plugins work with reveal.js 4.0.0\n\t\tif( arguments.length === 2 && typeof arguments[0] === 'string' ) {\n\t\t\tplugin = arguments[1];\n\t\t\tplugin.id = arguments[0];\n\t\t}\n\t\t// Plugin can optionally be a function which we call\n\t\t// to create an instance of the plugin\n\t\telse if( typeof plugin === 'function' ) {\n\t\t\tplugin = plugin();\n\t\t}\n\n\t\tlet id = plugin.id;\n\n\t\tif( typeof id !== 'string' ) {\n\t\t\tconsole.warn( 'Unrecognized plugin format; can\\'t find plugin.id', plugin );\n\t\t}\n\t\telse if( this.registeredPlugins[id] === undefined ) {\n\t\t\tthis.registeredPlugins[id] = plugin;\n\n\t\t\t// If a plugin is registered after reveal.js is loaded,\n\t\t\t// initialize it right away\n\t\t\tif( this.state === 'loaded' && typeof plugin.init === 'function' ) {\n\t\t\t\tplugin.init( this.Reveal );\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tconsole.warn( 'reveal.js: \"'+ id +'\" plugin has already been registered' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if a specific plugin has been registered.\n\t *\n\t * @param {String} id Unique plugin identifier\n\t */\n\thasPlugin( id ) {\n\n\t\treturn !!this.registeredPlugins[id];\n\n\t}\n\n\t/**\n\t * Returns the specific plugin instance, if a plugin\n\t * with the given ID has been registered.\n\t *\n\t * @param {String} id Unique plugin identifier\n\t */\n\tgetPlugin( id ) {\n\n\t\treturn this.registeredPlugins[id];\n\n\t}\n\n\tgetRegisteredPlugins() {\n\n\t\treturn this.registeredPlugins;\n\n\t}\n\n\tdestroy() {\n\n\t\tObject.values( this.registeredPlugins ).forEach( plugin => {\n\t\t\tif( typeof plugin.destroy === 'function' ) {\n\t\t\t\tplugin.destroy();\n\t\t\t}\n\t\t} );\n\n\t\tthis.registeredPlugins = {};\n\t\tthis.asyncDependencies = [];\n\n\t}\n\n}\n","/**\n * Copyright (c) 2014-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\nvar runtime = (function (exports) {\n  \"use strict\";\n\n  var Op = Object.prototype;\n  var hasOwn = Op.hasOwnProperty;\n  var undefined; // More compressible than void 0.\n  var $Symbol = typeof Symbol === \"function\" ? Symbol : {};\n  var iteratorSymbol = $Symbol.iterator || \"@@iterator\";\n  var asyncIteratorSymbol = $Symbol.asyncIterator || \"@@asyncIterator\";\n  var toStringTagSymbol = $Symbol.toStringTag || \"@@toStringTag\";\n\n  function define(obj, key, value) {\n    Object.defineProperty(obj, key, {\n      value: value,\n      enumerable: true,\n      configurable: true,\n      writable: true\n    });\n    return obj[key];\n  }\n  try {\n    // IE 8 has a broken Object.defineProperty that only works on DOM objects.\n    define({}, \"\");\n  } catch (err) {\n    define = function(obj, key, value) {\n      return obj[key] = value;\n    };\n  }\n\n  function wrap(innerFn, outerFn, self, tryLocsList) {\n    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.\n    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;\n    var generator = Object.create(protoGenerator.prototype);\n    var context = new Context(tryLocsList || []);\n\n    // The ._invoke method unifies the implementations of the .next,\n    // .throw, and .return methods.\n    generator._invoke = makeInvokeMethod(innerFn, self, context);\n\n    return generator;\n  }\n  exports.wrap = wrap;\n\n  // Try/catch helper to minimize deoptimizations. Returns a completion\n  // record like context.tryEntries[i].completion. This interface could\n  // have been (and was previously) designed to take a closure to be\n  // invoked without arguments, but in all the cases we care about we\n  // already have an existing method we want to call, so there's no need\n  // to create a new function object. We can even get away with assuming\n  // the method takes exactly one argument, since that happens to be true\n  // in every case, so we don't have to touch the arguments object. The\n  // only additional allocation required is the completion record, which\n  // has a stable shape and so hopefully should be cheap to allocate.\n  function tryCatch(fn, obj, arg) {\n    try {\n      return { type: \"normal\", arg: fn.call(obj, arg) };\n    } catch (err) {\n      return { type: \"throw\", arg: err };\n    }\n  }\n\n  var GenStateSuspendedStart = \"suspendedStart\";\n  var GenStateSuspendedYield = \"suspendedYield\";\n  var GenStateExecuting = \"executing\";\n  var GenStateCompleted = \"completed\";\n\n  // Returning this object from the innerFn has the same effect as\n  // breaking out of the dispatch switch statement.\n  var ContinueSentinel = {};\n\n  // Dummy constructor functions that we use as the .constructor and\n  // .constructor.prototype properties for functions that return Generator\n  // objects. For full spec compliance, you may wish to configure your\n  // minifier not to mangle the names of these two functions.\n  function Generator() {}\n  function GeneratorFunction() {}\n  function GeneratorFunctionPrototype() {}\n\n  // This is a polyfill for %IteratorPrototype% for environments that\n  // don't natively support it.\n  var IteratorPrototype = {};\n  IteratorPrototype[iteratorSymbol] = function () {\n    return this;\n  };\n\n  var getProto = Object.getPrototypeOf;\n  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));\n  if (NativeIteratorPrototype &&\n      NativeIteratorPrototype !== Op &&\n      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {\n    // This environment has a native %IteratorPrototype%; use it instead\n    // of the polyfill.\n    IteratorPrototype = NativeIteratorPrototype;\n  }\n\n  var Gp = GeneratorFunctionPrototype.prototype =\n    Generator.prototype = Object.create(IteratorPrototype);\n  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n  GeneratorFunctionPrototype.constructor = GeneratorFunction;\n  GeneratorFunction.displayName = define(\n    GeneratorFunctionPrototype,\n    toStringTagSymbol,\n    \"GeneratorFunction\"\n  );\n\n  // Helper for defining the .next, .throw, and .return methods of the\n  // Iterator interface in terms of a single ._invoke method.\n  function defineIteratorMethods(prototype) {\n    [\"next\", \"throw\", \"return\"].forEach(function(method) {\n      define(prototype, method, function(arg) {\n        return this._invoke(method, arg);\n      });\n    });\n  }\n\n  exports.isGeneratorFunction = function(genFun) {\n    var ctor = typeof genFun === \"function\" && genFun.constructor;\n    return ctor\n      ? ctor === GeneratorFunction ||\n        // For the native GeneratorFunction constructor, the best we can\n        // do is to check its .name property.\n        (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n      : false;\n  };\n\n  exports.mark = function(genFun) {\n    if (Object.setPrototypeOf) {\n      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);\n    } else {\n      genFun.__proto__ = GeneratorFunctionPrototype;\n      define(genFun, toStringTagSymbol, \"GeneratorFunction\");\n    }\n    genFun.prototype = Object.create(Gp);\n    return genFun;\n  };\n\n  // Within the body of any async function, `await x` is transformed to\n  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n  // `hasOwn.call(value, \"__await\")` to determine if the yielded value is\n  // meant to be awaited.\n  exports.awrap = function(arg) {\n    return { __await: arg };\n  };\n\n  function AsyncIterator(generator, PromiseImpl) {\n    function invoke(method, arg, resolve, reject) {\n      var record = tryCatch(generator[method], generator, arg);\n      if (record.type === \"throw\") {\n        reject(record.arg);\n      } else {\n        var result = record.arg;\n        var value = result.value;\n        if (value &&\n            typeof value === \"object\" &&\n            hasOwn.call(value, \"__await\")) {\n          return PromiseImpl.resolve(value.__await).then(function(value) {\n            invoke(\"next\", value, resolve, reject);\n          }, function(err) {\n            invoke(\"throw\", err, resolve, reject);\n          });\n        }\n\n        return PromiseImpl.resolve(value).then(function(unwrapped) {\n          // When a yielded Promise is resolved, its final value becomes\n          // the .value of the Promise<{value,done}> result for the\n          // current iteration.\n          result.value = unwrapped;\n          resolve(result);\n        }, function(error) {\n          // If a rejected Promise was yielded, throw the rejection back\n          // into the async generator function so it can be handled there.\n          return invoke(\"throw\", error, resolve, reject);\n        });\n      }\n    }\n\n    var previousPromise;\n\n    function enqueue(method, arg) {\n      function callInvokeWithMethodAndArg() {\n        return new PromiseImpl(function(resolve, reject) {\n          invoke(method, arg, resolve, reject);\n        });\n      }\n\n      return previousPromise =\n        // If enqueue has been called before, then we want to wait until\n        // all previous Promises have been resolved before calling invoke,\n        // so that results are always delivered in the correct order. If\n        // enqueue has not been called before, then it is important to\n        // call invoke immediately, without waiting on a callback to fire,\n        // so that the async generator function has the opportunity to do\n        // any necessary setup in a predictable way. This predictability\n        // is why the Promise constructor synchronously invokes its\n        // executor callback, and why async functions synchronously\n        // execute code before the first await. Since we implement simple\n        // async functions in terms of async generators, it is especially\n        // important to get this right, even though it requires care.\n        previousPromise ? previousPromise.then(\n          callInvokeWithMethodAndArg,\n          // Avoid propagating failures to Promises returned by later\n          // invocations of the iterator.\n          callInvokeWithMethodAndArg\n        ) : callInvokeWithMethodAndArg();\n    }\n\n    // Define the unified helper method that is used to implement .next,\n    // .throw, and .return (see defineIteratorMethods).\n    this._invoke = enqueue;\n  }\n\n  defineIteratorMethods(AsyncIterator.prototype);\n  AsyncIterator.prototype[asyncIteratorSymbol] = function () {\n    return this;\n  };\n  exports.AsyncIterator = AsyncIterator;\n\n  // Note that simple async functions are implemented on top of\n  // AsyncIterator objects; they just return a Promise for the value of\n  // the final result produced by the iterator.\n  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {\n    if (PromiseImpl === void 0) PromiseImpl = Promise;\n\n    var iter = new AsyncIterator(\n      wrap(innerFn, outerFn, self, tryLocsList),\n      PromiseImpl\n    );\n\n    return exports.isGeneratorFunction(outerFn)\n      ? iter // If outerFn is a generator, return the full iterator.\n      : iter.next().then(function(result) {\n          return result.done ? result.value : iter.next();\n        });\n  };\n\n  function makeInvokeMethod(innerFn, self, context) {\n    var state = GenStateSuspendedStart;\n\n    return function invoke(method, arg) {\n      if (state === GenStateExecuting) {\n        throw new Error(\"Generator is already running\");\n      }\n\n      if (state === GenStateCompleted) {\n        if (method === \"throw\") {\n          throw arg;\n        }\n\n        // Be forgiving, per 25.3.3.3.3 of the spec:\n        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n        return doneResult();\n      }\n\n      context.method = method;\n      context.arg = arg;\n\n      while (true) {\n        var delegate = context.delegate;\n        if (delegate) {\n          var delegateResult = maybeInvokeDelegate(delegate, context);\n          if (delegateResult) {\n            if (delegateResult === ContinueSentinel) continue;\n            return delegateResult;\n          }\n        }\n\n        if (context.method === \"next\") {\n          // Setting context._sent for legacy support of Babel's\n          // function.sent implementation.\n          context.sent = context._sent = context.arg;\n\n        } else if (context.method === \"throw\") {\n          if (state === GenStateSuspendedStart) {\n            state = GenStateCompleted;\n            throw context.arg;\n          }\n\n          context.dispatchException(context.arg);\n\n        } else if (context.method === \"return\") {\n          context.abrupt(\"return\", context.arg);\n        }\n\n        state = GenStateExecuting;\n\n        var record = tryCatch(innerFn, self, context);\n        if (record.type === \"normal\") {\n          // If an exception is thrown from innerFn, we leave state ===\n          // GenStateExecuting and loop back for another invocation.\n          state = context.done\n            ? GenStateCompleted\n            : GenStateSuspendedYield;\n\n          if (record.arg === ContinueSentinel) {\n            continue;\n          }\n\n          return {\n            value: record.arg,\n            done: context.done\n          };\n\n        } else if (record.type === \"throw\") {\n          state = GenStateCompleted;\n          // Dispatch the exception by looping back around to the\n          // context.dispatchException(context.arg) call above.\n          context.method = \"throw\";\n          context.arg = record.arg;\n        }\n      }\n    };\n  }\n\n  // Call delegate.iterator[context.method](context.arg) and handle the\n  // result, either by returning a { value, done } result from the\n  // delegate iterator, or by modifying context.method and context.arg,\n  // setting context.delegate to null, and returning the ContinueSentinel.\n  function maybeInvokeDelegate(delegate, context) {\n    var method = delegate.iterator[context.method];\n    if (method === undefined) {\n      // A .throw or .return when the delegate iterator has no .throw\n      // method always terminates the yield* loop.\n      context.delegate = null;\n\n      if (context.method === \"throw\") {\n        // Note: [\"return\"] must be used for ES3 parsing compatibility.\n        if (delegate.iterator[\"return\"]) {\n          // If the delegate iterator has a return method, give it a\n          // chance to clean up.\n          context.method = \"return\";\n          context.arg = undefined;\n          maybeInvokeDelegate(delegate, context);\n\n          if (context.method === \"throw\") {\n            // If maybeInvokeDelegate(context) changed context.method from\n            // \"return\" to \"throw\", let that override the TypeError below.\n            return ContinueSentinel;\n          }\n        }\n\n        context.method = \"throw\";\n        context.arg = new TypeError(\n          \"The iterator does not provide a 'throw' method\");\n      }\n\n      return ContinueSentinel;\n    }\n\n    var record = tryCatch(method, delegate.iterator, context.arg);\n\n    if (record.type === \"throw\") {\n      context.method = \"throw\";\n      context.arg = record.arg;\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    var info = record.arg;\n\n    if (! info) {\n      context.method = \"throw\";\n      context.arg = new TypeError(\"iterator result is not an object\");\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    if (info.done) {\n      // Assign the result of the finished delegate to the temporary\n      // variable specified by delegate.resultName (see delegateYield).\n      context[delegate.resultName] = info.value;\n\n      // Resume execution at the desired location (see delegateYield).\n      context.next = delegate.nextLoc;\n\n      // If context.method was \"throw\" but the delegate handled the\n      // exception, let the outer generator proceed normally. If\n      // context.method was \"next\", forget context.arg since it has been\n      // \"consumed\" by the delegate iterator. If context.method was\n      // \"return\", allow the original .return call to continue in the\n      // outer generator.\n      if (context.method !== \"return\") {\n        context.method = \"next\";\n        context.arg = undefined;\n      }\n\n    } else {\n      // Re-yield the result returned by the delegate method.\n      return info;\n    }\n\n    // The delegate iterator is finished, so forget it and continue with\n    // the outer generator.\n    context.delegate = null;\n    return ContinueSentinel;\n  }\n\n  // Define Generator.prototype.{next,throw,return} in terms of the\n  // unified ._invoke helper method.\n  defineIteratorMethods(Gp);\n\n  define(Gp, toStringTagSymbol, \"Generator\");\n\n  // A Generator should always return itself as the iterator object when the\n  // @@iterator function is called on it. Some browsers' implementations of the\n  // iterator prototype chain incorrectly implement this, causing the Generator\n  // object to not be returned from this call. This ensures that doesn't happen.\n  // See https://github.com/facebook/regenerator/issues/274 for more details.\n  Gp[iteratorSymbol] = function() {\n    return this;\n  };\n\n  Gp.toString = function() {\n    return \"[object Generator]\";\n  };\n\n  function pushTryEntry(locs) {\n    var entry = { tryLoc: locs[0] };\n\n    if (1 in locs) {\n      entry.catchLoc = locs[1];\n    }\n\n    if (2 in locs) {\n      entry.finallyLoc = locs[2];\n      entry.afterLoc = locs[3];\n    }\n\n    this.tryEntries.push(entry);\n  }\n\n  function resetTryEntry(entry) {\n    var record = entry.completion || {};\n    record.type = \"normal\";\n    delete record.arg;\n    entry.completion = record;\n  }\n\n  function Context(tryLocsList) {\n    // The root entry object (effectively a try statement without a catch\n    // or a finally block) gives us a place to store values thrown from\n    // locations where there is no enclosing try statement.\n    this.tryEntries = [{ tryLoc: \"root\" }];\n    tryLocsList.forEach(pushTryEntry, this);\n    this.reset(true);\n  }\n\n  exports.keys = function(object) {\n    var keys = [];\n    for (var key in object) {\n      keys.push(key);\n    }\n    keys.reverse();\n\n    // Rather than returning an object with a next method, we keep\n    // things simple and return the next function itself.\n    return function next() {\n      while (keys.length) {\n        var key = keys.pop();\n        if (key in object) {\n          next.value = key;\n          next.done = false;\n          return next;\n        }\n      }\n\n      // To avoid creating an additional object, we just hang the .value\n      // and .done properties off the next function object itself. This\n      // also ensures that the minifier will not anonymize the function.\n      next.done = true;\n      return next;\n    };\n  };\n\n  function values(iterable) {\n    if (iterable) {\n      var iteratorMethod = iterable[iteratorSymbol];\n      if (iteratorMethod) {\n        return iteratorMethod.call(iterable);\n      }\n\n      if (typeof iterable.next === \"function\") {\n        return iterable;\n      }\n\n      if (!isNaN(iterable.length)) {\n        var i = -1, next = function next() {\n          while (++i < iterable.length) {\n            if (hasOwn.call(iterable, i)) {\n              next.value = iterable[i];\n              next.done = false;\n              return next;\n            }\n          }\n\n          next.value = undefined;\n          next.done = true;\n\n          return next;\n        };\n\n        return next.next = next;\n      }\n    }\n\n    // Return an iterator with no values.\n    return { next: doneResult };\n  }\n  exports.values = values;\n\n  function doneResult() {\n    return { value: undefined, done: true };\n  }\n\n  Context.prototype = {\n    constructor: Context,\n\n    reset: function(skipTempReset) {\n      this.prev = 0;\n      this.next = 0;\n      // Resetting context._sent for legacy support of Babel's\n      // function.sent implementation.\n      this.sent = this._sent = undefined;\n      this.done = false;\n      this.delegate = null;\n\n      this.method = \"next\";\n      this.arg = undefined;\n\n      this.tryEntries.forEach(resetTryEntry);\n\n      if (!skipTempReset) {\n        for (var name in this) {\n          // Not sure about the optimal order of these conditions:\n          if (name.charAt(0) === \"t\" &&\n              hasOwn.call(this, name) &&\n              !isNaN(+name.slice(1))) {\n            this[name] = undefined;\n          }\n        }\n      }\n    },\n\n    stop: function() {\n      this.done = true;\n\n      var rootEntry = this.tryEntries[0];\n      var rootRecord = rootEntry.completion;\n      if (rootRecord.type === \"throw\") {\n        throw rootRecord.arg;\n      }\n\n      return this.rval;\n    },\n\n    dispatchException: function(exception) {\n      if (this.done) {\n        throw exception;\n      }\n\n      var context = this;\n      function handle(loc, caught) {\n        record.type = \"throw\";\n        record.arg = exception;\n        context.next = loc;\n\n        if (caught) {\n          // If the dispatched exception was caught by a catch block,\n          // then let that catch block handle the exception normally.\n          context.method = \"next\";\n          context.arg = undefined;\n        }\n\n        return !! caught;\n      }\n\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        var record = entry.completion;\n\n        if (entry.tryLoc === \"root\") {\n          // Exception thrown outside of any try block that could handle\n          // it, so set the completion value of the entire function to\n          // throw the exception.\n          return handle(\"end\");\n        }\n\n        if (entry.tryLoc <= this.prev) {\n          var hasCatch = hasOwn.call(entry, \"catchLoc\");\n          var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n          if (hasCatch && hasFinally) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            } else if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else if (hasCatch) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            }\n\n          } else if (hasFinally) {\n            if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else {\n            throw new Error(\"try statement without catch or finally\");\n          }\n        }\n      }\n    },\n\n    abrupt: function(type, arg) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc <= this.prev &&\n            hasOwn.call(entry, \"finallyLoc\") &&\n            this.prev < entry.finallyLoc) {\n          var finallyEntry = entry;\n          break;\n        }\n      }\n\n      if (finallyEntry &&\n          (type === \"break\" ||\n           type === \"continue\") &&\n          finallyEntry.tryLoc <= arg &&\n          arg <= finallyEntry.finallyLoc) {\n        // Ignore the finally entry if control is not jumping to a\n        // location outside the try/catch block.\n        finallyEntry = null;\n      }\n\n      var record = finallyEntry ? finallyEntry.completion : {};\n      record.type = type;\n      record.arg = arg;\n\n      if (finallyEntry) {\n        this.method = \"next\";\n        this.next = finallyEntry.finallyLoc;\n        return ContinueSentinel;\n      }\n\n      return this.complete(record);\n    },\n\n    complete: function(record, afterLoc) {\n      if (record.type === \"throw\") {\n        throw record.arg;\n      }\n\n      if (record.type === \"break\" ||\n          record.type === \"continue\") {\n        this.next = record.arg;\n      } else if (record.type === \"return\") {\n        this.rval = this.arg = record.arg;\n        this.method = \"return\";\n        this.next = \"end\";\n      } else if (record.type === \"normal\" && afterLoc) {\n        this.next = afterLoc;\n      }\n\n      return ContinueSentinel;\n    },\n\n    finish: function(finallyLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.finallyLoc === finallyLoc) {\n          this.complete(entry.completion, entry.afterLoc);\n          resetTryEntry(entry);\n          return ContinueSentinel;\n        }\n      }\n    },\n\n    \"catch\": function(tryLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc === tryLoc) {\n          var record = entry.completion;\n          if (record.type === \"throw\") {\n            var thrown = record.arg;\n            resetTryEntry(entry);\n          }\n          return thrown;\n        }\n      }\n\n      // The context.catch method must only be called with a location\n      // argument that corresponds to a known catch block.\n      throw new Error(\"illegal catch attempt\");\n    },\n\n    delegateYield: function(iterable, resultName, nextLoc) {\n      this.delegate = {\n        iterator: values(iterable),\n        resultName: resultName,\n        nextLoc: nextLoc\n      };\n\n      if (this.method === \"next\") {\n        // Deliberately forget the last sent value so that we don't\n        // accidentally pass it on to the delegate.\n        this.arg = undefined;\n      }\n\n      return ContinueSentinel;\n    }\n  };\n\n  // Regardless of whether this script is executing as a CommonJS module\n  // or not, return the runtime object so that we can declare the variable\n  // regeneratorRuntime in the outer scope, which allows this module to be\n  // injected easily by `bin/regenerator --include-runtime script.js`.\n  return exports;\n\n}(\n  // If this script is executing as a CommonJS module, use module.exports\n  // as the regeneratorRuntime namespace. Otherwise create a new empty\n  // object. Either way, the resulting object will be used to initialize\n  // the regeneratorRuntime variable at the top of this file.\n  typeof module === \"object\" ? module.exports : {}\n));\n\ntry {\n  regeneratorRuntime = runtime;\n} catch (accidentalStrictMode) {\n  // This module should not be running in strict mode, so the above\n  // assignment should always work unless something is misconfigured. Just\n  // in case runtime.js accidentally runs in strict mode, we can escape\n  // strict mode using a global Function call. This could conceivably fail\n  // if a Content Security Policy forbids using Function, but in that case\n  // the proper solution is to fix the accidental strict mode problem. If\n  // you've misconfigured your bundler to force strict mode and applied a\n  // CSP to forbid Function, and you're not willing to fix either of those\n  // problems, please detail your unique predicament in a GitHub issue.\n  Function(\"r\", \"regeneratorRuntime = r\")(runtime);\n}\n","import { SLIDES_SELECTOR } from '../utils/constants.js'\nimport { queryAll, createStyleSheet } from '../utils/util.js'\n\n/**\n * Setups up our presentation for printing/exporting to PDF.\n */\nexport default class Print {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\t/**\n\t * Configures the presentation for printing to a static\n\t * PDF.\n\t */\n\tasync setupPDF() {\n\n\t\tconst config = this.Reveal.getConfig();\n\t\tconst slides = queryAll( this.Reveal.getRevealElement(), SLIDES_SELECTOR )\n\n\t\t// Compute slide numbers now, before we start duplicating slides\n\t\tconst injectPageNumbers = config.slideNumber && /all|print/i.test( config.showSlideNumber );\n\n\t\tconst slideSize = this.Reveal.getComputedSlideSize( window.innerWidth, window.innerHeight );\n\n\t\t// Dimensions of the PDF pages\n\t\tconst pageWidth = Math.floor( slideSize.width * ( 1 + config.margin ) ),\n\t\t\tpageHeight = Math.floor( slideSize.height * ( 1 + config.margin ) );\n\n\t\t// Dimensions of slides within the pages\n\t\tconst slideWidth = slideSize.width,\n\t\t\tslideHeight = slideSize.height;\n\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\t// Let the browser know what page size we want to print\n\t\tcreateStyleSheet( '@page{size:'+ pageWidth +'px '+ pageHeight +'px; margin: 0px;}' );\n\n\t\t// Limit the size of certain elements to the dimensions of the slide\n\t\tcreateStyleSheet( '.reveal section>img, .reveal section>video, .reveal section>iframe{max-width: '+ slideWidth +'px; max-height:'+ slideHeight +'px}' );\n\n\t\tdocument.documentElement.classList.add( 'print-pdf' );\n\t\tdocument.body.style.width = pageWidth + 'px';\n\t\tdocument.body.style.height = pageHeight + 'px';\n\n\t\tconst viewportElement = document.querySelector( '.reveal-viewport' );\n\t\tlet presentationBackground;\n\t\tif( viewportElement ) {\n\t\t\tconst viewportStyles = window.getComputedStyle( viewportElement );\n\t\t\tif( viewportStyles && viewportStyles.background ) {\n\t\t\t\tpresentationBackground = viewportStyles.background;\n\t\t\t}\n\t\t}\n\n\t\t// Make sure stretch elements fit on slide\n\t\tawait new Promise( requestAnimationFrame );\n\t\tthis.Reveal.layoutSlideContents( slideWidth, slideHeight );\n\n\t\t// Batch scrollHeight access to prevent layout thrashing\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\tconst slideScrollHeights = slides.map( slide => slide.scrollHeight );\n\n\t\tconst pages = [];\n\t\tconst pageContainer = slides[0].parentNode;\n\t\tlet slideNumber = 1;\n\n\t\t// Slide and slide background layout\n\t\tslides.forEach( function( slide, index ) {\n\n\t\t\t// Vertical stacks are not centred since their section\n\t\t\t// children will be\n\t\t\tif( slide.classList.contains( 'stack' ) === false ) {\n\t\t\t\t// Center the slide inside of the page, giving the slide some margin\n\t\t\t\tlet left = ( pageWidth - slideWidth ) / 2;\n\t\t\t\tlet top = ( pageHeight - slideHeight ) / 2;\n\n\t\t\t\tconst contentHeight = slideScrollHeights[ index ];\n\t\t\t\tlet numberOfPages = Math.max( Math.ceil( contentHeight / pageHeight ), 1 );\n\n\t\t\t\t// Adhere to configured pages per slide limit\n\t\t\t\tnumberOfPages = Math.min( numberOfPages, config.pdfMaxPagesPerSlide );\n\n\t\t\t\t// Center slides vertically\n\t\t\t\tif( numberOfPages === 1 && config.center || slide.classList.contains( 'center' ) ) {\n\t\t\t\t\ttop = Math.max( ( pageHeight - contentHeight ) / 2, 0 );\n\t\t\t\t}\n\n\t\t\t\t// Wrap the slide in a page element and hide its overflow\n\t\t\t\t// so that no page ever flows onto another\n\t\t\t\tconst page = document.createElement( 'div' );\n\t\t\t\tpages.push( page );\n\n\t\t\t\tpage.className = 'pdf-page';\n\t\t\t\tpage.style.height = ( ( pageHeight + config.pdfPageHeightOffset ) * numberOfPages ) + 'px';\n\n\t\t\t\t// Copy the presentation-wide background to each individual\n\t\t\t\t// page when printing\n\t\t\t\tif( presentationBackground ) {\n\t\t\t\t\tpage.style.background = presentationBackground;\n\t\t\t\t}\n\n\t\t\t\tpage.appendChild( slide );\n\n\t\t\t\t// Position the slide inside of the page\n\t\t\t\tslide.style.left = left + 'px';\n\t\t\t\tslide.style.top = top + 'px';\n\t\t\t\tslide.style.width = slideWidth + 'px';\n\n\t\t\t\tthis.Reveal.slideContent.layout( slide );\n\n\t\t\t\tif( slide.slideBackgroundElement ) {\n\t\t\t\t\tpage.insertBefore( slide.slideBackgroundElement, slide );\n\t\t\t\t}\n\n\t\t\t\t// Inject notes if `showNotes` is enabled\n\t\t\t\tif( config.showNotes ) {\n\n\t\t\t\t\t// Are there notes for this slide?\n\t\t\t\t\tconst notes = this.Reveal.getSlideNotes( slide );\n\t\t\t\t\tif( notes ) {\n\n\t\t\t\t\t\tconst notesSpacing = 8;\n\t\t\t\t\t\tconst notesLayout = typeof config.showNotes === 'string' ? config.showNotes : 'inline';\n\t\t\t\t\t\tconst notesElement = document.createElement( 'div' );\n\t\t\t\t\t\tnotesElement.classList.add( 'speaker-notes' );\n\t\t\t\t\t\tnotesElement.classList.add( 'speaker-notes-pdf' );\n\t\t\t\t\t\tnotesElement.setAttribute( 'data-layout', notesLayout );\n\t\t\t\t\t\tnotesElement.innerHTML = notes;\n\n\t\t\t\t\t\tif( notesLayout === 'separate-page' ) {\n\t\t\t\t\t\t\tpages.push( notesElement );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tnotesElement.style.left = notesSpacing + 'px';\n\t\t\t\t\t\t\tnotesElement.style.bottom = notesSpacing + 'px';\n\t\t\t\t\t\t\tnotesElement.style.width = ( pageWidth - notesSpacing*2 ) + 'px';\n\t\t\t\t\t\t\tpage.appendChild( notesElement );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\t// Inject page numbers if `slideNumbers` are enabled\n\t\t\t\tif( injectPageNumbers ) {\n\t\t\t\t\tconst numberElement = document.createElement( 'div' );\n\t\t\t\t\tnumberElement.classList.add( 'slide-number' );\n\t\t\t\t\tnumberElement.classList.add( 'slide-number-pdf' );\n\t\t\t\t\tnumberElement.innerHTML = slideNumber++;\n\t\t\t\t\tpage.appendChild( numberElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy page and show fragments one after another\n\t\t\t\tif( config.pdfSeparateFragments ) {\n\n\t\t\t\t\t// Each fragment 'group' is an array containing one or more\n\t\t\t\t\t// fragments. Multiple fragments that appear at the same time\n\t\t\t\t\t// are part of the same group.\n\t\t\t\t\tconst fragmentGroups = this.Reveal.fragments.sort( page.querySelectorAll( '.fragment' ), true );\n\n\t\t\t\t\tlet previousFragmentStep;\n\n\t\t\t\t\tfragmentGroups.forEach( function( fragments, index ) {\n\n\t\t\t\t\t\t// Remove 'current-fragment' from the previous group\n\t\t\t\t\t\tif( previousFragmentStep ) {\n\t\t\t\t\t\t\tpreviousFragmentStep.forEach( function( fragment ) {\n\t\t\t\t\t\t\t\tfragment.classList.remove( 'current-fragment' );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\t// Show the fragments for the current index\n\t\t\t\t\t\tfragments.forEach( function( fragment ) {\n\t\t\t\t\t\t\tfragment.classList.add( 'visible', 'current-fragment' );\n\t\t\t\t\t\t}, this );\n\n\t\t\t\t\t\t// Create a separate page for the current fragment state\n\t\t\t\t\t\tconst clonedPage = page.cloneNode( true );\n\n\t\t\t\t\t\t// Inject unique page numbers for fragments\n\t\t\t\t\t\tif( injectPageNumbers ) {\n\t\t\t\t\t\t\tconst numberElement = clonedPage.querySelector( '.slide-number-pdf' );\n\t\t\t\t\t\t\tconst fragmentNumber = index + 1;\n\t\t\t\t\t\t\tnumberElement.innerHTML += '.' + fragmentNumber;\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tpages.push( clonedPage );\n\n\t\t\t\t\t\tpreviousFragmentStep = fragments;\n\n\t\t\t\t\t}, this );\n\n\t\t\t\t\t// Reset the first/original page so that all fragments are hidden\n\t\t\t\t\tfragmentGroups.forEach( function( fragments ) {\n\t\t\t\t\t\tfragments.forEach( function( fragment ) {\n\t\t\t\t\t\t\tfragment.classList.remove( 'visible', 'current-fragment' );\n\t\t\t\t\t\t} );\n\t\t\t\t\t} );\n\n\t\t\t\t}\n\t\t\t\t// Show all fragments\n\t\t\t\telse {\n\t\t\t\t\tqueryAll( page, '.fragment:not(.fade-out)' ).forEach( function( fragment ) {\n\t\t\t\t\t\tfragment.classList.add( 'visible' );\n\t\t\t\t\t} );\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}, this );\n\n\t\tawait new Promise( requestAnimationFrame );\n\n\t\tpages.forEach( page => pageContainer.appendChild( page ) );\n\n\t\t// Re-run JS-based content layout after the slide is added to page DOM\n\t\tthis.Reveal.slideContent.layout( this.Reveal.getSlidesElement() );\n\n\t\t// Notify subscribers that the PDF layout is good to go\n\t\tthis.Reveal.dispatchEvent({ type: 'pdf-ready' });\n\n\t}\n\n\t/**\n\t * Checks if this instance is being used to print a PDF.\n\t */\n\tisPrintingPDF() {\n\n\t\treturn ( /print-pdf/gi ).test( window.location.search );\n\n\t}\n\n}\n","import { isAndroid } from '../utils/device.js'\nimport { matches } from '../utils/util.js'\n\nconst SWIPE_THRESHOLD = 40;\n\n/**\n * Controls all touch interactions and navigations for\n * a presentation.\n */\nexport default class Touch {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\t// Holds information about the currently ongoing touch interaction\n\t\tthis.touchStartX = 0;\n\t\tthis.touchStartY = 0;\n\t\tthis.touchStartCount = 0;\n\t\tthis.touchCaptured = false;\n\n\t\tthis.onPointerDown = this.onPointerDown.bind( this );\n\t\tthis.onPointerMove = this.onPointerMove.bind( this );\n\t\tthis.onPointerUp = this.onPointerUp.bind( this );\n\t\tthis.onTouchStart = this.onTouchStart.bind( this );\n\t\tthis.onTouchMove = this.onTouchMove.bind( this );\n\t\tthis.onTouchEnd = this.onTouchEnd.bind( this );\n\n\t}\n\n\t/**\n\t *\n\t */\n\tbind() {\n\n\t\tlet revealElement = this.Reveal.getRevealElement();\n\n\t\tif( 'onpointerdown' in window ) {\n\t\t\t// Use W3C pointer events\n\t\t\trevealElement.addEventListener( 'pointerdown', this.onPointerDown, false );\n\t\t\trevealElement.addEventListener( 'pointermove', this.onPointerMove, false );\n\t\t\trevealElement.addEventListener( 'pointerup', this.onPointerUp, false );\n\t\t}\n\t\telse if( window.navigator.msPointerEnabled ) {\n\t\t\t// IE 10 uses prefixed version of pointer events\n\t\t\trevealElement.addEventListener( 'MSPointerDown', this.onPointerDown, false );\n\t\t\trevealElement.addEventListener( 'MSPointerMove', this.onPointerMove, false );\n\t\t\trevealElement.addEventListener( 'MSPointerUp', this.onPointerUp, false );\n\t\t}\n\t\telse {\n\t\t\t// Fall back to touch events\n\t\t\trevealElement.addEventListener( 'touchstart', this.onTouchStart, false );\n\t\t\trevealElement.addEventListener( 'touchmove', this.onTouchMove, false );\n\t\t\trevealElement.addEventListener( 'touchend', this.onTouchEnd, false );\n\t\t}\n\n\t}\n\n\t/**\n\t *\n\t */\n\tunbind() {\n\n\t\tlet revealElement = this.Reveal.getRevealElement();\n\n\t\trevealElement.removeEventListener( 'pointerdown', this.onPointerDown, false );\n\t\trevealElement.removeEventListener( 'pointermove', this.onPointerMove, false );\n\t\trevealElement.removeEventListener( 'pointerup', this.onPointerUp, false );\n\n\t\trevealElement.removeEventListener( 'MSPointerDown', this.onPointerDown, false );\n\t\trevealElement.removeEventListener( 'MSPointerMove', this.onPointerMove, false );\n\t\trevealElement.removeEventListener( 'MSPointerUp', this.onPointerUp, false );\n\n\t\trevealElement.removeEventListener( 'touchstart', this.onTouchStart, false );\n\t\trevealElement.removeEventListener( 'touchmove', this.onTouchMove, false );\n\t\trevealElement.removeEventListener( 'touchend', this.onTouchEnd, false );\n\n\t}\n\n\t/**\n\t * Checks if the target element prevents the triggering of\n\t * swipe navigation.\n\t */\n\tisSwipePrevented( target ) {\n\n\t\t// Prevent accidental swipes when scrubbing timelines\n\t\tif( matches( target, 'video, audio' ) ) return true;\n\n\t\twhile( target && typeof target.hasAttribute === 'function' ) {\n\t\t\tif( target.hasAttribute( 'data-prevent-swipe' ) ) return true;\n\t\t\ttarget = target.parentNode;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Handler for the 'touchstart' event, enables support for\n\t * swipe and pinch gestures.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchStart( event ) {\n\n\t\tif( this.isSwipePrevented( event.target ) ) return true;\n\n\t\tthis.touchStartX = event.touches[0].clientX;\n\t\tthis.touchStartY = event.touches[0].clientY;\n\t\tthis.touchStartCount = event.touches.length;\n\n\t}\n\n\t/**\n\t * Handler for the 'touchmove' event.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchMove( event ) {\n\n\t\tif( this.isSwipePrevented( event.target ) ) return true;\n\n\t\tlet config = this.Reveal.getConfig();\n\n\t\t// Each touch should only trigger one action\n\t\tif( !this.touchCaptured ) {\n\t\t\tthis.Reveal.onUserInput( event );\n\n\t\t\tlet currentX = event.touches[0].clientX;\n\t\t\tlet currentY = event.touches[0].clientY;\n\n\t\t\t// There was only one touch point, look for a swipe\n\t\t\tif( event.touches.length === 1 && this.touchStartCount !== 2 ) {\n\n\t\t\t\tlet availableRoutes = this.Reveal.availableRoutes({ includeFragments: true });\n\n\t\t\t\tlet deltaX = currentX - this.touchStartX,\n\t\t\t\t\tdeltaY = currentY - this.touchStartY;\n\n\t\t\t\tif( deltaX > SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tif( config.rtl ) {\n\t\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.left();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaX < -SWIPE_THRESHOLD && Math.abs( deltaX ) > Math.abs( deltaY ) ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tif( config.rtl ) {\n\t\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.right();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaY > SWIPE_THRESHOLD && availableRoutes.up ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tthis.Reveal.prev();\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.up();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( deltaY < -SWIPE_THRESHOLD && availableRoutes.down ) {\n\t\t\t\t\tthis.touchCaptured = true;\n\t\t\t\t\tif( config.navigationMode === 'linear' ) {\n\t\t\t\t\t\tthis.Reveal.next();\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.Reveal.down();\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// If we're embedded, only block touch events if they have\n\t\t\t\t// triggered an action\n\t\t\t\tif( config.embedded ) {\n\t\t\t\t\tif( this.touchCaptured || this.Reveal.isVerticalSlide() ) {\n\t\t\t\t\t\tevent.preventDefault();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Not embedded? Block them all to avoid needless tossing\n\t\t\t\t// around of the viewport in iOS\n\t\t\t\telse {\n\t\t\t\t\tevent.preventDefault();\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\t\t// There's a bug with swiping on some Android devices unless\n\t\t// the default action is always prevented\n\t\telse if( isAndroid ) {\n\t\t\tevent.preventDefault();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the 'touchend' event.\n\t *\n\t * @param {object} event\n\t */\n\tonTouchEnd( event ) {\n\n\t\tthis.touchCaptured = false;\n\n\t}\n\n\t/**\n\t * Convert pointer down to touch start.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerDown( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" ) {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchStart( event );\n\t\t}\n\n\t}\n\n\t/**\n\t * Convert pointer move to touch move.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerMove( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" )  {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchMove( event );\n\t\t}\n\n\t}\n\n\t/**\n\t * Convert pointer up to touch end.\n\t *\n\t * @param {object} event\n\t */\n\tonPointerUp( event ) {\n\n\t\tif( event.pointerType === event.MSPOINTER_TYPE_TOUCH || event.pointerType === \"touch\" )  {\n\t\t\tevent.touches = [{ clientX: event.clientX, clientY: event.clientY }];\n\t\t\tthis.onTouchEnd( event );\n\t\t}\n\n\t}\n\n}","import { closest } from '../utils/util.js'\n\n/**\n * Manages focus when a presentation is embedded. This\n * helps us only capture keyboard from the presentation\n * a user is currently interacting with in a page where\n * multiple presentations are embedded.\n */\n\nconst STATE_FOCUS = 'focus';\nconst STATE_BLUR = 'blur';\n\nexport default class Focus {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t\tthis.onRevealPointerDown = this.onRevealPointerDown.bind( this );\n\t\tthis.onDocumentPointerDown = this.onDocumentPointerDown.bind( this );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.embedded ) {\n\t\t\tthis.blur();\n\t\t}\n\t\telse {\n\t\t\tthis.focus();\n\t\t\tthis.unbind();\n\t\t}\n\n\t}\n\n\tbind() {\n\n\t\tif( this.Reveal.getConfig().embedded ) {\n\t\t\tthis.Reveal.getRevealElement().addEventListener( 'pointerdown', this.onRevealPointerDown, false );\n\t\t}\n\n\t}\n\n\tunbind() {\n\n\t\tthis.Reveal.getRevealElement().removeEventListener( 'pointerdown', this.onRevealPointerDown, false );\n\t\tdocument.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\n\t}\n\n\tfocus() {\n\n\t\tif( this.state !== STATE_FOCUS ) {\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'focused' );\n\t\t\tdocument.addEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\t\t}\n\n\t\tthis.state = STATE_FOCUS;\n\n\t}\n\n\tblur() {\n\n\t\tif( this.state !== STATE_BLUR ) {\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'focused' );\n\t\t\tdocument.removeEventListener( 'pointerdown', this.onDocumentPointerDown, false );\n\t\t}\n\n\t\tthis.state = STATE_BLUR;\n\n\t}\n\n\tisFocused() {\n\n\t\treturn this.state === STATE_FOCUS;\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.Reveal.getRevealElement().classList.remove( 'focused' );\n\n\t}\n\n\tonRevealPointerDown( event ) {\n\n\t\tthis.focus();\n\n\t}\n\n\tonDocumentPointerDown( event ) {\n\n\t\tlet revealElement = closest( event.target, '.reveal' );\n\t\tif( !revealElement || revealElement !== this.Reveal.getRevealElement() ) {\n\t\t\tthis.blur();\n\t\t}\n\n\t}\n\n}","/**\n * Handles the showing and \n */\nexport default class Notes {\n\n\tconstructor( Reveal ) {\n\n\t\tthis.Reveal = Reveal;\n\n\t}\n\n\trender() {\n\n\t\tthis.element = document.createElement( 'div' );\n\t\tthis.element.className = 'speaker-notes';\n\t\tthis.element.setAttribute( 'data-prevent-swipe', '' );\n\t\tthis.element.setAttribute( 'tabindex', '0' );\n\t\tthis.Reveal.getRevealElement().appendChild( this.element );\n\n\t}\n\n\t/**\n\t * Called when the reveal.js config is updated.\n\t */\n\tconfigure( config, oldConfig ) {\n\n\t\tif( config.showNotes ) {\n\t\t\tthis.element.setAttribute( 'data-layout', typeof config.showNotes === 'string' ? config.showNotes : 'inline' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Pick up notes from the current slide and display them\n\t * to the viewer.\n\t *\n\t * @see {@link config.showNotes}\n\t */\n\tupdate() {\n\n\t\tif( this.Reveal.getConfig().showNotes && this.element && this.Reveal.getCurrentSlide() && !this.Reveal.print.isPrintingPDF() ) {\n\n\t\t\tthis.element.innerHTML = this.getSlideNotes() || '<span class=\"notes-placeholder\">No notes on this slide.</span>';\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates the visibility of the speaker notes sidebar that\n\t * is used to share annotated slides. The notes sidebar is\n\t * only visible if showNotes is true and there are notes on\n\t * one or more slides in the deck.\n\t */\n\tupdateVisibility() {\n\n\t\tif( this.Reveal.getConfig().showNotes && this.hasNotes() && !this.Reveal.print.isPrintingPDF() ) {\n\t\t\tthis.Reveal.getRevealElement().classList.add( 'show-notes' );\n\t\t}\n\t\telse {\n\t\t\tthis.Reveal.getRevealElement().classList.remove( 'show-notes' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if there are speaker notes for ANY slide in the\n\t * presentation.\n\t */\n\thasNotes() {\n\n\t\treturn this.Reveal.getSlidesElement().querySelectorAll( '[data-notes], aside.notes' ).length > 0;\n\n\t}\n\n\t/**\n\t * Checks if this presentation is running inside of the\n\t * speaker notes window.\n\t *\n\t * @return {boolean}\n\t */\n\tisSpeakerNotesWindow() {\n\n\t\treturn !!window.location.search.match( /receiver/gi );\n\n\t}\n\n\t/**\n\t * Retrieves the speaker notes from a slide. Notes can be\n\t * defined in two ways:\n\t * 1. As a data-notes attribute on the slide <section>\n\t * 2. As an <aside class=\"notes\"> inside of the slide\n\t *\n\t * @param {HTMLElement} [slide=currentSlide]\n\t * @return {(string|null)}\n\t */\n\tgetSlideNotes( slide = this.Reveal.getCurrentSlide() ) {\n\n\t\t// Notes can be specified via the data-notes attribute...\n\t\tif( slide.hasAttribute( 'data-notes' ) ) {\n\t\t\treturn slide.getAttribute( 'data-notes' );\n\t\t}\n\n\t\t// ... or using an <aside class=\"notes\"> element\n\t\tlet notesElement = slide.querySelector( 'aside.notes' );\n\t\tif( notesElement ) {\n\t\t\treturn notesElement.innerHTML;\n\t\t}\n\n\t\treturn null;\n\n\t}\n\n\tdestroy() {\n\n\t\tthis.element.remove();\n\n\t}\n\n}","'use strict';\nvar toObject = require('../internals/to-object');\nvar toAbsoluteIndex = require('../internals/to-absolute-index');\nvar toLength = require('../internals/to-length');\n\n// `Array.prototype.fill` method implementation\n// https://tc39.es/ecma262/#sec-array.prototype.fill\nmodule.exports = function fill(value /* , start = 0, end = @length */) {\n  var O = toObject(this);\n  var length = toLength(O.length);\n  var argumentsLength = arguments.length;\n  var index = toAbsoluteIndex(argumentsLength > 1 ? arguments[1] : undefined, length);\n  var end = argumentsLength > 2 ? arguments[2] : undefined;\n  var endPos = end === undefined ? length : toAbsoluteIndex(end, length);\n  while (endPos > index) O[index++] = value;\n  return O;\n};\n","var wellKnownSymbol = require('../internals/well-known-symbol');\nvar create = require('../internals/object-create');\nvar definePropertyModule = require('../internals/object-define-property');\n\nvar UNSCOPABLES = wellKnownSymbol('unscopables');\nvar ArrayPrototype = Array.prototype;\n\n// Array.prototype[@@unscopables]\n// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables\nif (ArrayPrototype[UNSCOPABLES] == undefined) {\n  definePropertyModule.f(ArrayPrototype, UNSCOPABLES, {\n    configurable: true,\n    value: create(null)\n  });\n}\n\n// add a key to Array.prototype[@@unscopables]\nmodule.exports = function (key) {\n  ArrayPrototype[UNSCOPABLES][key] = true;\n};\n","var $ = require('../internals/export');\nvar fill = require('../internals/array-fill');\nvar addToUnscopables = require('../internals/add-to-unscopables');\n\n// `Array.prototype.fill` method\n// https://tc39.es/ecma262/#sec-array.prototype.fill\n$({ target: 'Array', proto: true }, {\n  fill: fill\n});\n\n// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables\naddToUnscopables('fill');\n","/**\n * UI component that lets the use control auto-slide\n * playback via play/pause.\n */\nexport default class Playback {\n\n\t/**\n\t * @param {HTMLElement} container The component will append\n\t * itself to this\n\t * @param {function} progressCheck A method which will be\n\t * called frequently to get the current playback progress on\n\t * a range of 0-1\n\t */\n\tconstructor( container, progressCheck ) {\n\n\t\t// Cosmetics\n\t\tthis.diameter = 100;\n\t\tthis.diameter2 = this.diameter/2;\n\t\tthis.thickness = 6;\n\n\t\t// Flags if we are currently playing\n\t\tthis.playing = false;\n\n\t\t// Current progress on a 0-1 range\n\t\tthis.progress = 0;\n\n\t\t// Used to loop the animation smoothly\n\t\tthis.progressOffset = 1;\n\n\t\tthis.container = container;\n\t\tthis.progressCheck = progressCheck;\n\n\t\tthis.canvas = document.createElement( 'canvas' );\n\t\tthis.canvas.className = 'playback';\n\t\tthis.canvas.width = this.diameter;\n\t\tthis.canvas.height = this.diameter;\n\t\tthis.canvas.style.width = this.diameter2 + 'px';\n\t\tthis.canvas.style.height = this.diameter2 + 'px';\n\t\tthis.context = this.canvas.getContext( '2d' );\n\n\t\tthis.container.appendChild( this.canvas );\n\n\t\tthis.render();\n\n\t}\n\n\tsetPlaying( value ) {\n\n\t\tconst wasPlaying = this.playing;\n\n\t\tthis.playing = value;\n\n\t\t// Start repainting if we weren't already\n\t\tif( !wasPlaying && this.playing ) {\n\t\t\tthis.animate();\n\t\t}\n\t\telse {\n\t\t\tthis.render();\n\t\t}\n\n\t}\n\n\tanimate() {\n\n\t\tconst progressBefore = this.progress;\n\n\t\tthis.progress = this.progressCheck();\n\n\t\t// When we loop, offset the progress so that it eases\n\t\t// smoothly rather than immediately resetting\n\t\tif( progressBefore > 0.8 && this.progress < 0.2 ) {\n\t\t\tthis.progressOffset = this.progress;\n\t\t}\n\n\t\tthis.render();\n\n\t\tif( this.playing ) {\n\t\t\trequestAnimationFrame( this.animate.bind( this ) );\n\t\t}\n\n\t}\n\n\t/**\n\t * Renders the current progress and playback state.\n\t */\n\trender() {\n\n\t\tlet progress = this.playing ? this.progress : 0,\n\t\t\tradius = ( this.diameter2 ) - this.thickness,\n\t\t\tx = this.diameter2,\n\t\t\ty = this.diameter2,\n\t\t\ticonSize = 28;\n\n\t\t// Ease towards 1\n\t\tthis.progressOffset += ( 1 - this.progressOffset ) * 0.1;\n\n\t\tconst endAngle = ( - Math.PI / 2 ) + ( progress * ( Math.PI * 2 ) );\n\t\tconst startAngle = ( - Math.PI / 2 ) + ( this.progressOffset * ( Math.PI * 2 ) );\n\n\t\tthis.context.save();\n\t\tthis.context.clearRect( 0, 0, this.diameter, this.diameter );\n\n\t\t// Solid background color\n\t\tthis.context.beginPath();\n\t\tthis.context.arc( x, y, radius + 4, 0, Math.PI * 2, false );\n\t\tthis.context.fillStyle = 'rgba( 0, 0, 0, 0.4 )';\n\t\tthis.context.fill();\n\n\t\t// Draw progress track\n\t\tthis.context.beginPath();\n\t\tthis.context.arc( x, y, radius, 0, Math.PI * 2, false );\n\t\tthis.context.lineWidth = this.thickness;\n\t\tthis.context.strokeStyle = 'rgba( 255, 255, 255, 0.2 )';\n\t\tthis.context.stroke();\n\n\t\tif( this.playing ) {\n\t\t\t// Draw progress on top of track\n\t\t\tthis.context.beginPath();\n\t\t\tthis.context.arc( x, y, radius, startAngle, endAngle, false );\n\t\t\tthis.context.lineWidth = this.thickness;\n\t\t\tthis.context.strokeStyle = '#fff';\n\t\t\tthis.context.stroke();\n\t\t}\n\n\t\tthis.context.translate( x - ( iconSize / 2 ), y - ( iconSize / 2 ) );\n\n\t\t// Draw play/pause icons\n\t\tif( this.playing ) {\n\t\t\tthis.context.fillStyle = '#fff';\n\t\t\tthis.context.fillRect( 0, 0, iconSize / 2 - 4, iconSize );\n\t\t\tthis.context.fillRect( iconSize / 2 + 4, 0, iconSize / 2 - 4, iconSize );\n\t\t}\n\t\telse {\n\t\t\tthis.context.beginPath();\n\t\t\tthis.context.translate( 4, 0 );\n\t\t\tthis.context.moveTo( 0, 0 );\n\t\t\tthis.context.lineTo( iconSize - 4, iconSize / 2 );\n\t\t\tthis.context.lineTo( 0, iconSize );\n\t\t\tthis.context.fillStyle = '#fff';\n\t\t\tthis.context.fill();\n\t\t}\n\n\t\tthis.context.restore();\n\n\t}\n\n\ton( type, listener ) {\n\t\tthis.canvas.addEventListener( type, listener, false );\n\t}\n\n\toff( type, listener ) {\n\t\tthis.canvas.removeEventListener( type, listener, false );\n\t}\n\n\tdestroy() {\n\n\t\tthis.playing = false;\n\n\t\tif( this.canvas.parentNode ) {\n\t\t\tthis.container.removeChild( this.canvas );\n\t\t}\n\n\t}\n\n}","/**\n * The default reveal.js config object.\n */\nexport default {\n\n\t// The \"normal\" size of the presentation, aspect ratio will be preserved\n\t// when the presentation is scaled to fit different resolutions\n\twidth: 960,\n\theight: 700,\n\n\t// Factor of the display size that should remain empty around the content\n\tmargin: 0.04,\n\n\t// Bounds for smallest/largest possible scale to apply to content\n\tminScale: 0.2,\n\tmaxScale: 2.0,\n\n\t// Display presentation control arrows\n\tcontrols: true,\n\n\t// Help the user learn the controls by providing hints, for example by\n\t// bouncing the down arrow when they first encounter a vertical slide\n\tcontrolsTutorial: true,\n\n\t// Determines where controls appear, \"edges\" or \"bottom-right\"\n\tcontrolsLayout: 'bottom-right',\n\n\t// Visibility rule for backwards navigation arrows; \"faded\", \"hidden\"\n\t// or \"visible\"\n\tcontrolsBackArrows: 'faded',\n\n\t// Display a presentation progress bar\n\tprogress: true,\n\n\t// Display the page number of the current slide\n\t// - true:    Show slide number\n\t// - false:   Hide slide number\n\t//\n\t// Can optionally be set as a string that specifies the number formatting:\n\t// - \"h.v\":\t  Horizontal . vertical slide number (default)\n\t// - \"h/v\":\t  Horizontal / vertical slide number\n\t// - \"c\":\t  Flattened slide number\n\t// - \"c/t\":\t  Flattened slide number / total slides\n\t//\n\t// Alternatively, you can provide a function that returns the slide\n\t// number for the current slide. The function should take in a slide\n\t// object and return an array with one string [slideNumber] or\n\t// three strings [n1,delimiter,n2]. See #formatSlideNumber().\n\tslideNumber: false,\n\n\t// Can be used to limit the contexts in which the slide number appears\n\t// - \"all\":      Always show the slide number\n\t// - \"print\":    Only when printing to PDF\n\t// - \"speaker\":  Only in the speaker view\n\tshowSlideNumber: 'all',\n\n\t// Use 1 based indexing for # links to match slide number (default is zero\n\t// based)\n\thashOneBasedIndex: false,\n\n\t// Add the current slide number to the URL hash so that reloading the\n\t// page/copying the URL will return you to the same slide\n\thash: false,\n\n\t// Flags if we should monitor the hash and change slides accordingly\n\trespondToHashChanges: true,\n\n\t// Push each slide change to the browser history.  Implies `hash: true`\n\thistory: false,\n\n\t// Enable keyboard shortcuts for navigation\n\tkeyboard: true,\n\n\t// Optional function that blocks keyboard events when retuning false\n\t//\n\t// If you set this to 'focused', we will only capture keyboard events\n\t// for embedded decks when they are in focus\n\tkeyboardCondition: null,\n\n\t// Disables the default reveal.js slide layout (scaling and centering)\n\t// so that you can use custom CSS layout\n\tdisableLayout: false,\n\n\t// Enable the slide overview mode\n\toverview: true,\n\n\t// Vertical centering of slides\n\tcenter: true,\n\n\t// Enables touch navigation on devices with touch input\n\ttouch: true,\n\n\t// Loop the presentation\n\tloop: false,\n\n\t// Change the presentation direction to be RTL\n\trtl: false,\n\n\t// Changes the behavior of our navigation directions.\n\t//\n\t// \"default\"\n\t// Left/right arrow keys step between horizontal slides, up/down\n\t// arrow keys step between vertical slides. Space key steps through\n\t// all slides (both horizontal and vertical).\n\t//\n\t// \"linear\"\n\t// Removes the up/down arrows. Left/right arrows step through all\n\t// slides (both horizontal and vertical).\n\t//\n\t// \"grid\"\n\t// When this is enabled, stepping left/right from a vertical stack\n\t// to an adjacent vertical stack will land you at the same vertical\n\t// index.\n\t//\n\t// Consider a deck with six slides ordered in two vertical stacks:\n\t// 1.1    2.1\n\t// 1.2    2.2\n\t// 1.3    2.3\n\t//\n\t// If you're on slide 1.3 and navigate right, you will normally move\n\t// from 1.3 -> 2.1. If \"grid\" is used, the same navigation takes you\n\t// from 1.3 -> 2.3.\n\tnavigationMode: 'default',\n\n\t// Randomizes the order of slides each time the presentation loads\n\tshuffle: false,\n\n\t// Turns fragments on and off globally\n\tfragments: true,\n\n\t// Flags whether to include the current fragment in the URL,\n\t// so that reloading brings you to the same fragment position\n\tfragmentInURL: true,\n\n\t// Flags if the presentation is running in an embedded mode,\n\t// i.e. contained within a limited portion of the screen\n\tembedded: false,\n\n\t// Flags if we should show a help overlay when the question-mark\n\t// key is pressed\n\thelp: true,\n\n\t// Flags if it should be possible to pause the presentation (blackout)\n\tpause: true,\n\n\t// Flags if speaker notes should be visible to all viewers\n\tshowNotes: false,\n\n\t// Flags if slides with data-visibility=\"hidden\" should be kep visible\n\tshowHiddenSlides: false,\n\n\t// Global override for autoplaying embedded media (video/audio/iframe)\n\t// - null:   Media will only autoplay if data-autoplay is present\n\t// - true:   All media will autoplay, regardless of individual setting\n\t// - false:  No media will autoplay, regardless of individual setting\n\tautoPlayMedia: null,\n\n\t// Global override for preloading lazy-loaded iframes\n\t// - null:   Iframes with data-src AND data-preload will be loaded when within\n\t//           the viewDistance, iframes with only data-src will be loaded when visible\n\t// - true:   All iframes with data-src will be loaded when within the viewDistance\n\t// - false:  All iframes with data-src will be loaded only when visible\n\tpreloadIframes: null,\n\n\t// Can be used to globally disable auto-animation\n\tautoAnimate: true,\n\n\t// Optionally provide a custom element matcher that will be\n\t// used to dictate which elements we can animate between.\n\tautoAnimateMatcher: null,\n\n\t// Default settings for our auto-animate transitions, can be\n\t// overridden per-slide or per-element via data arguments\n\tautoAnimateEasing: 'ease',\n\tautoAnimateDuration: 1.0,\n\tautoAnimateUnmatched: true,\n\n\t// CSS properties that can be auto-animated. Position & scale\n\t// is matched separately so there's no need to include styles\n\t// like top/right/bottom/left, width/height or margin.\n\tautoAnimateStyles: [\n\t\t'opacity',\n\t\t'color',\n\t\t'background-color',\n\t\t'padding',\n\t\t'font-size',\n\t\t'line-height',\n\t\t'letter-spacing',\n\t\t'border-width',\n\t\t'border-color',\n\t\t'border-radius',\n\t\t'outline',\n\t\t'outline-offset'\n\t],\n\n\t// Controls automatic progression to the next slide\n\t// - 0:      Auto-sliding only happens if the data-autoslide HTML attribute\n\t//           is present on the current slide or fragment\n\t// - 1+:     All slides will progress automatically at the given interval\n\t// - false:  No auto-sliding, even if data-autoslide is present\n\tautoSlide: 0,\n\n\t// Stop auto-sliding after user input\n\tautoSlideStoppable: true,\n\n\t// Use this method for navigation when auto-sliding (defaults to navigateNext)\n\tautoSlideMethod: null,\n\n\t// Specify the average time in seconds that you think you will spend\n\t// presenting each slide. This is used to show a pacing timer in the\n\t// speaker view\n\tdefaultTiming: null,\n\n\t// Enable slide navigation via mouse wheel\n\tmouseWheel: false,\n\n\t// Opens links in an iframe preview overlay\n\t// Add `data-preview-link` and `data-preview-link=\"false\"` to customise each link\n\t// individually\n\tpreviewLinks: false,\n\n\t// Exposes the reveal.js API through window.postMessage\n\tpostMessage: true,\n\n\t// Dispatches all reveal.js events to the parent window through postMessage\n\tpostMessageEvents: false,\n\n\t// Focuses body when page changes visibility to ensure keyboard shortcuts work\n\tfocusBodyOnPageVisibilityChange: true,\n\n\t// Transition style\n\ttransition: 'slide', // none/fade/slide/convex/concave/zoom\n\n\t// Transition speed\n\ttransitionSpeed: 'default', // default/fast/slow\n\n\t// Transition style for full page slide backgrounds\n\tbackgroundTransition: 'fade', // none/fade/slide/convex/concave/zoom\n\n\t// Parallax background image\n\tparallaxBackgroundImage: '', // CSS syntax, e.g. \"a.jpg\"\n\n\t// Parallax background size\n\tparallaxBackgroundSize: '', // CSS syntax, e.g. \"3000px 2000px\"\n\n\t// Parallax background repeat\n\tparallaxBackgroundRepeat: '', // repeat/repeat-x/repeat-y/no-repeat/initial/inherit\n\n\t// Parallax background position\n\tparallaxBackgroundPosition: '', // CSS syntax, e.g. \"top left\"\n\n\t// Amount of pixels to move the parallax background per slide step\n\tparallaxBackgroundHorizontal: null,\n\tparallaxBackgroundVertical: null,\n\n\t// The maximum number of pages a single slide can expand onto when printing\n\t// to PDF, unlimited by default\n\tpdfMaxPagesPerSlide: Number.POSITIVE_INFINITY,\n\n\t// Prints each fragment on a separate slide\n\tpdfSeparateFragments: true,\n\n\t// Offset used to reduce the height of content within exported PDF pages.\n\t// This exists to account for environment differences based on how you\n\t// print to PDF. CLI printing options, like phantomjs and wkpdf, can end\n\t// on precisely the total height of the document whereas in-browser\n\t// printing has to end one pixel before.\n\tpdfPageHeightOffset: -1,\n\n\t// Number of slides away from the current that are visible\n\tviewDistance: 3,\n\n\t// Number of slides away from the current that are visible on mobile\n\t// devices. It is advisable to set this to a lower number than\n\t// viewDistance in order to save resources.\n\tmobileViewDistance: 2,\n\n\t// The display mode that will be used to show slides\n\tdisplay: 'block',\n\n\t// Hide cursor if inactive\n\thideInactiveCursor: true,\n\n\t// Time before the cursor is hidden (in ms)\n\thideCursorTime: 5000,\n\n\t// Script dependencies to load\n\tdependencies: [],\n\n\t// Plugin objects to register and use for this presentation\n\tplugins: []\n\n}","import SlideContent from './controllers/slidecontent.js'\nimport SlideNumber from './controllers/slidenumber.js'\nimport Backgrounds from './controllers/backgrounds.js'\nimport AutoAnimate from './controllers/autoanimate.js'\nimport Fragments from './controllers/fragments.js'\nimport Overview from './controllers/overview.js'\nimport Keyboard from './controllers/keyboard.js'\nimport Location from './controllers/location.js'\nimport Controls from './controllers/controls.js'\nimport Progress from './controllers/progress.js'\nimport Pointer from './controllers/pointer.js'\nimport Plugins from './controllers/plugins.js'\nimport Print from './controllers/print.js'\nimport Touch from './controllers/touch.js'\nimport Focus from './controllers/focus.js'\nimport Notes from './controllers/notes.js'\nimport Playback from './components/playback.js'\nimport defaultConfig from './config.js'\nimport * as Util from './utils/util.js'\nimport * as Device from './utils/device.js'\nimport {\n\tSLIDES_SELECTOR,\n\tHORIZONTAL_SLIDES_SELECTOR,\n\tVERTICAL_SLIDES_SELECTOR,\n\tPOST_MESSAGE_METHOD_BLACKLIST\n} from './utils/constants.js'\n\n// The reveal.js version\nexport const VERSION = '4.3.1';\n\n/**\n * reveal.js\n * https://revealjs.com\n * MIT licensed\n *\n * Copyright (C) 2011-2022 Hakim El Hattab, https://hakim.se\n */\nexport default function( revealElement, options ) {\n\n\t// Support initialization with no args, one arg\n\t// [options] or two args [revealElement, options]\n\tif( arguments.length < 2 ) {\n\t\toptions = arguments[0];\n\t\trevealElement = document.querySelector( '.reveal' );\n\t}\n\n\tconst Reveal = {};\n\n\t// Configuration defaults, can be overridden at initialization time\n\tlet config = {},\n\n\t\t// Flags if reveal.js is loaded (has dispatched the 'ready' event)\n\t\tready = false,\n\n\t\t// The horizontal and vertical index of the currently active slide\n\t\tindexh,\n\t\tindexv,\n\n\t\t// The previous and current slide HTML elements\n\t\tpreviousSlide,\n\t\tcurrentSlide,\n\n\t\t// Remember which directions that the user has navigated towards\n\t\tnavigationHistory = {\n\t\t\thasNavigatedHorizontally: false,\n\t\t\thasNavigatedVertically: false\n\t\t},\n\n\t\t// Slides may have a data-state attribute which we pick up and apply\n\t\t// as a class to the body. This list contains the combined state of\n\t\t// all current slides.\n\t\tstate = [],\n\n\t\t// The current scale of the presentation (see width/height config)\n\t\tscale = 1,\n\n\t\t// CSS transform that is currently applied to the slides container,\n\t\t// split into two groups\n\t\tslidesTransform = { layout: '', overview: '' },\n\n\t\t// Cached references to DOM elements\n\t\tdom = {},\n\n\t\t// Flags if the interaction event listeners are bound\n\t\teventsAreBound = false,\n\n\t\t// The current slide transition state; idle or running\n\t\ttransition = 'idle',\n\n\t\t// The current auto-slide duration\n\t\tautoSlide = 0,\n\n\t\t// Auto slide properties\n\t\tautoSlidePlayer,\n\t\tautoSlideTimeout = 0,\n\t\tautoSlideStartTime = -1,\n\t\tautoSlidePaused = false,\n\n\t\t// Controllers for different aspects of our presentation. They're\n\t\t// all given direct references to this Reveal instance since there\n\t\t// may be multiple presentations running in parallel.\n\t\tslideContent = new SlideContent( Reveal ),\n\t\tslideNumber = new SlideNumber( Reveal ),\n\t\tautoAnimate = new AutoAnimate( Reveal ),\n\t\tbackgrounds = new Backgrounds( Reveal ),\n\t\tfragments = new Fragments( Reveal ),\n\t\toverview = new Overview( Reveal ),\n\t\tkeyboard = new Keyboard( Reveal ),\n\t\tlocation = new Location( Reveal ),\n\t\tcontrols = new Controls( Reveal ),\n\t\tprogress = new Progress( Reveal ),\n\t\tpointer = new Pointer( Reveal ),\n\t\tplugins = new Plugins( Reveal ),\n\t\tprint = new Print( Reveal ),\n\t\tfocus = new Focus( Reveal ),\n\t\ttouch = new Touch( Reveal ),\n\t\tnotes = new Notes( Reveal );\n\n\t/**\n\t * Starts up the presentation.\n\t */\n\tfunction initialize( initOptions ) {\n\n\t\tif( !revealElement ) throw 'Unable to find presentation root (<div class=\"reveal\">).';\n\n\t\t// Cache references to key DOM elements\n\t\tdom.wrapper = revealElement;\n\t\tdom.slides = revealElement.querySelector( '.slides' );\n\n\t\tif( !dom.slides ) throw 'Unable to find slides container (<div class=\"slides\">).';\n\n\t\t// Compose our config object in order of increasing precedence:\n\t\t// 1. Default reveal.js options\n\t\t// 2. Options provided via Reveal.configure() prior to\n\t\t//    initialization\n\t\t// 3. Options passed to the Reveal constructor\n\t\t// 4. Options passed to Reveal.initialize\n\t\t// 5. Query params\n\t\tconfig = { ...defaultConfig, ...config, ...options, ...initOptions, ...Util.getQueryHash() };\n\n\t\tsetViewport();\n\n\t\t// Force a layout when the whole page, incl fonts, has loaded\n\t\twindow.addEventListener( 'load', layout, false );\n\n\t\t// Register plugins and load dependencies, then move on to #start()\n\t\tplugins.load( config.plugins, config.dependencies ).then( start );\n\n\t\treturn new Promise( resolve => Reveal.on( 'ready', resolve ) );\n\n\t}\n\n\t/**\n\t * Encase the presentation in a reveal.js viewport. The\n\t * extent of the viewport differs based on configuration.\n\t */\n\tfunction setViewport() {\n\n\t\t// Embedded decks use the reveal element as their viewport\n\t\tif( config.embedded === true ) {\n\t\t\tdom.viewport = Util.closest( revealElement, '.reveal-viewport' ) || revealElement;\n\t\t}\n\t\t// Full-page decks use the body as their viewport\n\t\telse {\n\t\t\tdom.viewport = document.body;\n\t\t\tdocument.documentElement.classList.add( 'reveal-full-page' );\n\t\t}\n\n\t\tdom.viewport.classList.add( 'reveal-viewport' );\n\n\t}\n\n\t/**\n\t * Starts up reveal.js by binding input events and navigating\n\t * to the current URL deeplink if there is one.\n\t */\n\tfunction start() {\n\n\t\tready = true;\n\n\t\t// Remove slides hidden with data-visibility\n\t\tremoveHiddenSlides();\n\n\t\t// Make sure we've got all the DOM elements we need\n\t\tsetupDOM();\n\n\t\t// Listen to messages posted to this window\n\t\tsetupPostMessage();\n\n\t\t// Prevent the slides from being scrolled out of view\n\t\tsetupScrollPrevention();\n\n\t\t// Adds bindings for fullscreen mode\n\t\tsetupFullscreen();\n\n\t\t// Resets all vertical slides so that only the first is visible\n\t\tresetVerticalSlides();\n\n\t\t// Updates the presentation to match the current configuration values\n\t\tconfigure();\n\n\t\t// Read the initial hash\n\t\tlocation.readURL();\n\n\t\t// Create slide backgrounds\n\t\tbackgrounds.update( true );\n\n\t\t// Notify listeners that the presentation is ready but use a 1ms\n\t\t// timeout to ensure it's not fired synchronously after #initialize()\n\t\tsetTimeout( () => {\n\t\t\t// Enable transitions now that we're loaded\n\t\t\tdom.slides.classList.remove( 'no-transition' );\n\n\t\t\tdom.wrapper.classList.add( 'ready' );\n\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'ready',\n\t\t\t\tdata: {\n\t\t\t\t\tindexh,\n\t\t\t\t\tindexv,\n\t\t\t\t\tcurrentSlide\n\t\t\t\t}\n\t\t\t});\n\t\t}, 1 );\n\n\t\t// Special setup and config is required when printing to PDF\n\t\tif( print.isPrintingPDF() ) {\n\t\t\tremoveEventListeners();\n\n\t\t\t// The document needs to have loaded for the PDF layout\n\t\t\t// measurements to be accurate\n\t\t\tif( document.readyState === 'complete' ) {\n\t\t\t\tprint.setupPDF();\n\t\t\t}\n\t\t\telse {\n\t\t\t\twindow.addEventListener( 'load', () => {\n\t\t\t\t\tprint.setupPDF();\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Removes all slides with data-visibility=\"hidden\". This\n\t * is done right before the rest of the presentation is\n\t * initialized.\n\t *\n\t * If you want to show all hidden slides, initialize\n\t * reveal.js with showHiddenSlides set to true.\n\t */\n\tfunction removeHiddenSlides() {\n\n\t\tif( !config.showHiddenSlides ) {\n\t\t\tUtil.queryAll( dom.wrapper, 'section[data-visibility=\"hidden\"]' ).forEach( slide => {\n\t\t\t\tslide.parentNode.removeChild( slide );\n\t\t\t} );\n\t\t}\n\n\t}\n\n\t/**\n\t * Finds and stores references to DOM elements which are\n\t * required by the presentation. If a required element is\n\t * not found, it is created.\n\t */\n\tfunction setupDOM() {\n\n\t\t// Prevent transitions while we're loading\n\t\tdom.slides.classList.add( 'no-transition' );\n\n\t\tif( Device.isMobile ) {\n\t\t\tdom.wrapper.classList.add( 'no-hover' );\n\t\t}\n\t\telse {\n\t\t\tdom.wrapper.classList.remove( 'no-hover' );\n\t\t}\n\n\t\tbackgrounds.render();\n\t\tslideNumber.render();\n\t\tcontrols.render();\n\t\tprogress.render();\n\t\tnotes.render();\n\n\t\t// Overlay graphic which is displayed during the paused mode\n\t\tdom.pauseOverlay = Util.createSingletonNode( dom.wrapper, 'div', 'pause-overlay', config.controls ? '<button class=\"resume-button\">Resume presentation</button>' : null );\n\n\t\tdom.statusElement = createStatusElement();\n\n\t\tdom.wrapper.setAttribute( 'role', 'application' );\n\t}\n\n\t/**\n\t * Creates a hidden div with role aria-live to announce the\n\t * current slide content. Hide the div off-screen to make it\n\t * available only to Assistive Technologies.\n\t *\n\t * @return {HTMLElement}\n\t */\n\tfunction createStatusElement() {\n\n\t\tlet statusElement = dom.wrapper.querySelector( '.aria-status' );\n\t\tif( !statusElement ) {\n\t\t\tstatusElement = document.createElement( 'div' );\n\t\t\tstatusElement.style.position = 'absolute';\n\t\t\tstatusElement.style.height = '1px';\n\t\t\tstatusElement.style.width = '1px';\n\t\t\tstatusElement.style.overflow = 'hidden';\n\t\t\tstatusElement.style.clip = 'rect( 1px, 1px, 1px, 1px )';\n\t\t\tstatusElement.classList.add( 'aria-status' );\n\t\t\tstatusElement.setAttribute( 'aria-live', 'polite' );\n\t\t\tstatusElement.setAttribute( 'aria-atomic','true' );\n\t\t\tdom.wrapper.appendChild( statusElement );\n\t\t}\n\t\treturn statusElement;\n\n\t}\n\n\t/**\n\t * Announces the given text to screen readers.\n\t */\n\tfunction announceStatus( value ) {\n\n\t\tdom.statusElement.textContent = value;\n\n\t}\n\n\t/**\n\t * Converts the given HTML element into a string of text\n\t * that can be announced to a screen reader. Hidden\n\t * elements are excluded.\n\t */\n\tfunction getStatusText( node ) {\n\n\t\tlet text = '';\n\n\t\t// Text node\n\t\tif( node.nodeType === 3 ) {\n\t\t\ttext += node.textContent;\n\t\t}\n\t\t// Element node\n\t\telse if( node.nodeType === 1 ) {\n\n\t\t\tlet isAriaHidden = node.getAttribute( 'aria-hidden' );\n\t\t\tlet isDisplayHidden = window.getComputedStyle( node )['display'] === 'none';\n\t\t\tif( isAriaHidden !== 'true' && !isDisplayHidden ) {\n\n\t\t\t\tArray.from( node.childNodes ).forEach( child => {\n\t\t\t\t\ttext += getStatusText( child );\n\t\t\t\t} );\n\n\t\t\t}\n\n\t\t}\n\n\t\ttext = text.trim();\n\n\t\treturn text === '' ? '' : text + ' ';\n\n\t}\n\n\t/**\n\t * This is an unfortunate necessity. Some actions – such as\n\t * an input field being focused in an iframe or using the\n\t * keyboard to expand text selection beyond the bounds of\n\t * a slide – can trigger our content to be pushed out of view.\n\t * This scrolling can not be prevented by hiding overflow in\n\t * CSS (we already do) so we have to resort to repeatedly\n\t * checking if the slides have been offset :(\n\t */\n\tfunction setupScrollPrevention() {\n\n\t\tsetInterval( () => {\n\t\t\tif( dom.wrapper.scrollTop !== 0 || dom.wrapper.scrollLeft !== 0 ) {\n\t\t\t\tdom.wrapper.scrollTop = 0;\n\t\t\t\tdom.wrapper.scrollLeft = 0;\n\t\t\t}\n\t\t}, 1000 );\n\n\t}\n\n\t/**\n\t * After entering fullscreen we need to force a layout to\n\t * get our presentations to scale correctly. This behavior\n\t * is inconsistent across browsers but a force layout seems\n\t * to normalize it.\n\t */\n\tfunction setupFullscreen() {\n\n\t\tdocument.addEventListener( 'fullscreenchange', onFullscreenChange );\n\t\tdocument.addEventListener( 'webkitfullscreenchange', onFullscreenChange );\n\n\t}\n\n\t/**\n\t * Registers a listener to postMessage events, this makes it\n\t * possible to call all reveal.js API methods from another\n\t * window. For example:\n\t *\n\t * revealWindow.postMessage( JSON.stringify({\n\t *   method: 'slide',\n\t *   args: [ 2 ]\n\t * }), '*' );\n\t */\n\tfunction setupPostMessage() {\n\n\t\tif( config.postMessage ) {\n\t\t\twindow.addEventListener( 'message', onPostMessage, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Applies the configuration settings from the config\n\t * object. May be called multiple times.\n\t *\n\t * @param {object} options\n\t */\n\tfunction configure( options ) {\n\n\t\tconst oldConfig = { ...config }\n\n\t\t// New config options may be passed when this method\n\t\t// is invoked through the API after initialization\n\t\tif( typeof options === 'object' ) Util.extend( config, options );\n\n\t\t// Abort if reveal.js hasn't finished loading, config\n\t\t// changes will be applied automatically once ready\n\t\tif( Reveal.isReady() ===  false ) return;\n\n\t\tconst numberOfSlides = dom.wrapper.querySelectorAll( SLIDES_SELECTOR ).length;\n\n\t\t// The transition is added as a class on the .reveal element\n\t\tdom.wrapper.classList.remove( oldConfig.transition );\n\t\tdom.wrapper.classList.add( config.transition );\n\n\t\tdom.wrapper.setAttribute( 'data-transition-speed', config.transitionSpeed );\n\t\tdom.wrapper.setAttribute( 'data-background-transition', config.backgroundTransition );\n\n\t\t// Expose our configured slide dimensions as custom props\n\t\tdom.viewport.style.setProperty( '--slide-width', config.width + 'px' );\n\t\tdom.viewport.style.setProperty( '--slide-height', config.height + 'px' );\n\n\t\tif( config.shuffle ) {\n\t\t\tshuffle();\n\t\t}\n\n\t\tUtil.toggleClass( dom.wrapper, 'embedded', config.embedded );\n\t\tUtil.toggleClass( dom.wrapper, 'rtl', config.rtl );\n\t\tUtil.toggleClass( dom.wrapper, 'center', config.center );\n\n\t\t// Exit the paused mode if it was configured off\n\t\tif( config.pause === false ) {\n\t\t\tresume();\n\t\t}\n\n\t\t// Iframe link previews\n\t\tif( config.previewLinks ) {\n\t\t\tenablePreviewLinks();\n\t\t\tdisablePreviewLinks( '[data-preview-link=false]' );\n\t\t}\n\t\telse {\n\t\t\tdisablePreviewLinks();\n\t\t\tenablePreviewLinks( '[data-preview-link]:not([data-preview-link=false])' );\n\t\t}\n\n\t\t// Reset all changes made by auto-animations\n\t\tautoAnimate.reset();\n\n\t\t// Remove existing auto-slide controls\n\t\tif( autoSlidePlayer ) {\n\t\t\tautoSlidePlayer.destroy();\n\t\t\tautoSlidePlayer = null;\n\t\t}\n\n\t\t// Generate auto-slide controls if needed\n\t\tif( numberOfSlides > 1 && config.autoSlide && config.autoSlideStoppable ) {\n\t\t\tautoSlidePlayer = new Playback( dom.wrapper, () => {\n\t\t\t\treturn Math.min( Math.max( ( Date.now() - autoSlideStartTime ) / autoSlide, 0 ), 1 );\n\t\t\t} );\n\n\t\t\tautoSlidePlayer.on( 'click', onAutoSlidePlayerClick );\n\t\t\tautoSlidePaused = false;\n\t\t}\n\n\t\t// Add the navigation mode to the DOM so we can adjust styling\n\t\tif( config.navigationMode !== 'default' ) {\n\t\t\tdom.wrapper.setAttribute( 'data-navigation-mode', config.navigationMode );\n\t\t}\n\t\telse {\n\t\t\tdom.wrapper.removeAttribute( 'data-navigation-mode' );\n\t\t}\n\n\t\tnotes.configure( config, oldConfig );\n\t\tfocus.configure( config, oldConfig );\n\t\tpointer.configure( config, oldConfig );\n\t\tcontrols.configure( config, oldConfig );\n\t\tprogress.configure( config, oldConfig );\n\t\tkeyboard.configure( config, oldConfig );\n\t\tfragments.configure( config, oldConfig );\n\t\tslideNumber.configure( config, oldConfig );\n\n\t\tsync();\n\n\t}\n\n\t/**\n\t * Binds all event listeners.\n\t */\n\tfunction addEventListeners() {\n\n\t\teventsAreBound = true;\n\n\t\twindow.addEventListener( 'resize', onWindowResize, false );\n\n\t\tif( config.touch ) touch.bind();\n\t\tif( config.keyboard ) keyboard.bind();\n\t\tif( config.progress ) progress.bind();\n\t\tif( config.respondToHashChanges ) location.bind();\n\t\tcontrols.bind();\n\t\tfocus.bind();\n\n\t\tdom.slides.addEventListener( 'click', onSlidesClicked, false );\n\t\tdom.slides.addEventListener( 'transitionend', onTransitionEnd, false );\n\t\tdom.pauseOverlay.addEventListener( 'click', resume, false );\n\n\t\tif( config.focusBodyOnPageVisibilityChange ) {\n\t\t\tdocument.addEventListener( 'visibilitychange', onPageVisibilityChange, false );\n\t\t}\n\n\t}\n\n\t/**\n\t * Unbinds all event listeners.\n\t */\n\tfunction removeEventListeners() {\n\n\t\teventsAreBound = false;\n\n\t\ttouch.unbind();\n\t\tfocus.unbind();\n\t\tkeyboard.unbind();\n\t\tcontrols.unbind();\n\t\tprogress.unbind();\n\t\tlocation.unbind();\n\n\t\twindow.removeEventListener( 'resize', onWindowResize, false );\n\n\t\tdom.slides.removeEventListener( 'click', onSlidesClicked, false );\n\t\tdom.slides.removeEventListener( 'transitionend', onTransitionEnd, false );\n\t\tdom.pauseOverlay.removeEventListener( 'click', resume, false );\n\n\t}\n\n\t/**\n\t * Uninitializes reveal.js by undoing changes made to the\n\t * DOM and removing all event listeners.\n\t */\n\tfunction destroy() {\n\n\t\tremoveEventListeners();\n\t\tcancelAutoSlide();\n\t\tdisablePreviewLinks();\n\n\t\t// Destroy controllers\n\t\tnotes.destroy();\n\t\tfocus.destroy();\n\t\tplugins.destroy();\n\t\tpointer.destroy();\n\t\tcontrols.destroy();\n\t\tprogress.destroy();\n\t\tbackgrounds.destroy();\n\t\tslideNumber.destroy();\n\n\t\t// Remove event listeners\n\t\tdocument.removeEventListener( 'fullscreenchange', onFullscreenChange );\n\t\tdocument.removeEventListener( 'webkitfullscreenchange', onFullscreenChange );\n\t\tdocument.removeEventListener( 'visibilitychange', onPageVisibilityChange, false );\n\t\twindow.removeEventListener( 'message', onPostMessage, false );\n\t\twindow.removeEventListener( 'load', layout, false );\n\n\t\t// Undo DOM changes\n\t\tif( dom.pauseOverlay ) dom.pauseOverlay.remove();\n\t\tif( dom.statusElement ) dom.statusElement.remove();\n\n\t\tdocument.documentElement.classList.remove( 'reveal-full-page' );\n\n\t\tdom.wrapper.classList.remove( 'ready', 'center', 'has-horizontal-slides', 'has-vertical-slides' );\n\t\tdom.wrapper.removeAttribute( 'data-transition-speed' );\n\t\tdom.wrapper.removeAttribute( 'data-background-transition' );\n\n\t\tdom.viewport.classList.remove( 'reveal-viewport' );\n\t\tdom.viewport.style.removeProperty( '--slide-width' );\n\t\tdom.viewport.style.removeProperty( '--slide-height' );\n\n\t\tdom.slides.style.removeProperty( 'width' );\n\t\tdom.slides.style.removeProperty( 'height' );\n\t\tdom.slides.style.removeProperty( 'zoom' );\n\t\tdom.slides.style.removeProperty( 'left' );\n\t\tdom.slides.style.removeProperty( 'top' );\n\t\tdom.slides.style.removeProperty( 'bottom' );\n\t\tdom.slides.style.removeProperty( 'right' );\n\t\tdom.slides.style.removeProperty( 'transform' );\n\n\t\tArray.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) ).forEach( slide => {\n\t\t\tslide.style.removeProperty( 'display' );\n\t\t\tslide.style.removeProperty( 'top' );\n\t\t\tslide.removeAttribute( 'hidden' );\n\t\t\tslide.removeAttribute( 'aria-hidden' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Adds a listener to one of our custom reveal.js events,\n\t * like slidechanged.\n\t */\n\tfunction on( type, listener, useCapture ) {\n\n\t\trevealElement.addEventListener( type, listener, useCapture );\n\n\t}\n\n\t/**\n\t * Unsubscribes from a reveal.js event.\n\t */\n\tfunction off( type, listener, useCapture ) {\n\n\t\trevealElement.removeEventListener( type, listener, useCapture );\n\n\t}\n\n\t/**\n\t * Applies CSS transforms to the slides container. The container\n\t * is transformed from two separate sources: layout and the overview\n\t * mode.\n\t *\n\t * @param {object} transforms\n\t */\n\tfunction transformSlides( transforms ) {\n\n\t\t// Pick up new transforms from arguments\n\t\tif( typeof transforms.layout === 'string' ) slidesTransform.layout = transforms.layout;\n\t\tif( typeof transforms.overview === 'string' ) slidesTransform.overview = transforms.overview;\n\n\t\t// Apply the transforms to the slides container\n\t\tif( slidesTransform.layout ) {\n\t\t\tUtil.transformElement( dom.slides, slidesTransform.layout + ' ' + slidesTransform.overview );\n\t\t}\n\t\telse {\n\t\t\tUtil.transformElement( dom.slides, slidesTransform.overview );\n\t\t}\n\n\t}\n\n\t/**\n\t * Dispatches an event of the specified type from the\n\t * reveal DOM element.\n\t */\n\tfunction dispatchEvent({ target=dom.wrapper, type, data, bubbles=true }) {\n\n\t\tlet event = document.createEvent( 'HTMLEvents', 1, 2 );\n\t\tevent.initEvent( type, bubbles, true );\n\t\tUtil.extend( event, data );\n\t\ttarget.dispatchEvent( event );\n\n\t\tif( target === dom.wrapper ) {\n\t\t\t// If we're in an iframe, post each reveal.js event to the\n\t\t\t// parent window. Used by the notes plugin\n\t\t\tdispatchPostMessage( type );\n\t\t}\n\n\t\treturn event;\n\n\t}\n\n\t/**\n\t * Dispatched a postMessage of the given type from our window.\n\t */\n\tfunction dispatchPostMessage( type, data ) {\n\n\t\tif( config.postMessageEvents && window.parent !== window.self ) {\n\t\t\tlet message = {\n\t\t\t\tnamespace: 'reveal',\n\t\t\t\teventName: type,\n\t\t\t\tstate: getState()\n\t\t\t};\n\n\t\t\tUtil.extend( message, data );\n\n\t\t\twindow.parent.postMessage( JSON.stringify( message ), '*' );\n\t\t}\n\n\t}\n\n\t/**\n\t * Bind preview frame links.\n\t *\n\t * @param {string} [selector=a] - selector for anchors\n\t */\n\tfunction enablePreviewLinks( selector = 'a' ) {\n\n\t\tArray.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {\n\t\t\tif( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {\n\t\t\t\telement.addEventListener( 'click', onPreviewLinkClicked, false );\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Unbind preview frame links.\n\t */\n\tfunction disablePreviewLinks( selector = 'a' ) {\n\n\t\tArray.from( dom.wrapper.querySelectorAll( selector ) ).forEach( element => {\n\t\t\tif( /^(http|www)/gi.test( element.getAttribute( 'href' ) ) ) {\n\t\t\t\telement.removeEventListener( 'click', onPreviewLinkClicked, false );\n\t\t\t}\n\t\t} );\n\n\t}\n\n\t/**\n\t * Opens a preview window for the target URL.\n\t *\n\t * @param {string} url - url for preview iframe src\n\t */\n\tfunction showPreview( url ) {\n\n\t\tcloseOverlay();\n\n\t\tdom.overlay = document.createElement( 'div' );\n\t\tdom.overlay.classList.add( 'overlay' );\n\t\tdom.overlay.classList.add( 'overlay-preview' );\n\t\tdom.wrapper.appendChild( dom.overlay );\n\n\t\tdom.overlay.innerHTML =\n\t\t\t`<header>\n\t\t\t\t<a class=\"close\" href=\"#\"><span class=\"icon\"></span></a>\n\t\t\t\t<a class=\"external\" href=\"${url}\" target=\"_blank\"><span class=\"icon\"></span></a>\n\t\t\t</header>\n\t\t\t<div class=\"spinner\"></div>\n\t\t\t<div class=\"viewport\">\n\t\t\t\t<iframe src=\"${url}\"></iframe>\n\t\t\t\t<small class=\"viewport-inner\">\n\t\t\t\t\t<span class=\"x-frame-error\">Unable to load iframe. This is likely due to the site's policy (x-frame-options).</span>\n\t\t\t\t</small>\n\t\t\t</div>`;\n\n\t\tdom.overlay.querySelector( 'iframe' ).addEventListener( 'load', event => {\n\t\t\tdom.overlay.classList.add( 'loaded' );\n\t\t}, false );\n\n\t\tdom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {\n\t\t\tcloseOverlay();\n\t\t\tevent.preventDefault();\n\t\t}, false );\n\n\t\tdom.overlay.querySelector( '.external' ).addEventListener( 'click', event => {\n\t\t\tcloseOverlay();\n\t\t}, false );\n\n\t}\n\n\t/**\n\t * Open or close help overlay window.\n\t *\n\t * @param {Boolean} [override] Flag which overrides the\n\t * toggle logic and forcibly sets the desired state. True means\n\t * help is open, false means it's closed.\n\t */\n\tfunction toggleHelp( override ){\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? showHelp() : closeOverlay();\n\t\t}\n\t\telse {\n\t\t\tif( dom.overlay ) {\n\t\t\t\tcloseOverlay();\n\t\t\t}\n\t\t\telse {\n\t\t\t\tshowHelp();\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Opens an overlay window with help material.\n\t */\n\tfunction showHelp() {\n\n\t\tif( config.help ) {\n\n\t\t\tcloseOverlay();\n\n\t\t\tdom.overlay = document.createElement( 'div' );\n\t\t\tdom.overlay.classList.add( 'overlay' );\n\t\t\tdom.overlay.classList.add( 'overlay-help' );\n\t\t\tdom.wrapper.appendChild( dom.overlay );\n\n\t\t\tlet html = '<p class=\"title\">Keyboard Shortcuts</p><br/>';\n\n\t\t\tlet shortcuts = keyboard.getShortcuts(),\n\t\t\t\tbindings = keyboard.getBindings();\n\n\t\t\thtml += '<table><th>KEY</th><th>ACTION</th>';\n\t\t\tfor( let key in shortcuts ) {\n\t\t\t\thtml += `<tr><td>${key}</td><td>${shortcuts[ key ]}</td></tr>`;\n\t\t\t}\n\n\t\t\t// Add custom key bindings that have associated descriptions\n\t\t\tfor( let binding in bindings ) {\n\t\t\t\tif( bindings[binding].key && bindings[binding].description ) {\n\t\t\t\t\thtml += `<tr><td>${bindings[binding].key}</td><td>${bindings[binding].description}</td></tr>`;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\thtml += '</table>';\n\n\t\t\tdom.overlay.innerHTML = `\n\t\t\t\t<header>\n\t\t\t\t\t<a class=\"close\" href=\"#\"><span class=\"icon\"></span></a>\n\t\t\t\t</header>\n\t\t\t\t<div class=\"viewport\">\n\t\t\t\t\t<div class=\"viewport-inner\">${html}</div>\n\t\t\t\t</div>\n\t\t\t`;\n\n\t\t\tdom.overlay.querySelector( '.close' ).addEventListener( 'click', event => {\n\t\t\t\tcloseOverlay();\n\t\t\t\tevent.preventDefault();\n\t\t\t}, false );\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Closes any currently open overlay.\n\t */\n\tfunction closeOverlay() {\n\n\t\tif( dom.overlay ) {\n\t\t\tdom.overlay.parentNode.removeChild( dom.overlay );\n\t\t\tdom.overlay = null;\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Applies JavaScript-controlled layout rules to the\n\t * presentation.\n\t */\n\tfunction layout() {\n\n\t\tif( dom.wrapper && !print.isPrintingPDF() ) {\n\n\t\t\tif( !config.disableLayout ) {\n\n\t\t\t\t// On some mobile devices '100vh' is taller than the visible\n\t\t\t\t// viewport which leads to part of the presentation being\n\t\t\t\t// cut off. To work around this we define our own '--vh' custom\n\t\t\t\t// property where 100x adds up to the correct height.\n\t\t\t\t//\n\t\t\t\t// https://css-tricks.com/the-trick-to-viewport-units-on-mobile/\n\t\t\t\tif( Device.isMobile && !config.embedded ) {\n\t\t\t\t\tdocument.documentElement.style.setProperty( '--vh', ( window.innerHeight * 0.01 ) + 'px' );\n\t\t\t\t}\n\n\t\t\t\tconst size = getComputedSlideSize();\n\n\t\t\t\tconst oldScale = scale;\n\n\t\t\t\t// Layout the contents of the slides\n\t\t\t\tlayoutSlideContents( config.width, config.height );\n\n\t\t\t\tdom.slides.style.width = size.width + 'px';\n\t\t\t\tdom.slides.style.height = size.height + 'px';\n\n\t\t\t\t// Determine scale of content to fit within available space\n\t\t\t\tscale = Math.min( size.presentationWidth / size.width, size.presentationHeight / size.height );\n\n\t\t\t\t// Respect max/min scale settings\n\t\t\t\tscale = Math.max( scale, config.minScale );\n\t\t\t\tscale = Math.min( scale, config.maxScale );\n\n\t\t\t\t// Don't apply any scaling styles if scale is 1\n\t\t\t\tif( scale === 1 ) {\n\t\t\t\t\tdom.slides.style.zoom = '';\n\t\t\t\t\tdom.slides.style.left = '';\n\t\t\t\t\tdom.slides.style.top = '';\n\t\t\t\t\tdom.slides.style.bottom = '';\n\t\t\t\t\tdom.slides.style.right = '';\n\t\t\t\t\ttransformSlides( { layout: '' } );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tdom.slides.style.zoom = '';\n\t\t\t\t\tdom.slides.style.left = '50%';\n\t\t\t\t\tdom.slides.style.top = '50%';\n\t\t\t\t\tdom.slides.style.bottom = 'auto';\n\t\t\t\t\tdom.slides.style.right = 'auto';\n\t\t\t\t\ttransformSlides( { layout: 'translate(-50%, -50%) scale('+ scale +')' } );\n\t\t\t\t}\n\n\t\t\t\t// Select all slides, vertical and horizontal\n\t\t\t\tconst slides = Array.from( dom.wrapper.querySelectorAll( SLIDES_SELECTOR ) );\n\n\t\t\t\tfor( let i = 0, len = slides.length; i < len; i++ ) {\n\t\t\t\t\tconst slide = slides[ i ];\n\n\t\t\t\t\t// Don't bother updating invisible slides\n\t\t\t\t\tif( slide.style.display === 'none' ) {\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\tif( config.center || slide.classList.contains( 'center' ) ) {\n\t\t\t\t\t\t// Vertical stacks are not centred since their section\n\t\t\t\t\t\t// children will be\n\t\t\t\t\t\tif( slide.classList.contains( 'stack' ) ) {\n\t\t\t\t\t\t\tslide.style.top = 0;\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tslide.style.top = Math.max( ( size.height - slide.scrollHeight ) / 2, 0 ) + 'px';\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tslide.style.top = '';\n\t\t\t\t\t}\n\n\t\t\t\t}\n\n\t\t\t\tif( oldScale !== scale ) {\n\t\t\t\t\tdispatchEvent({\n\t\t\t\t\t\ttype: 'resize',\n\t\t\t\t\t\tdata: {\n\t\t\t\t\t\t\toldScale,\n\t\t\t\t\t\t\tscale,\n\t\t\t\t\t\t\tsize\n\t\t\t\t\t\t}\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdom.viewport.style.setProperty( '--slide-scale', scale );\n\n\t\t\tprogress.update();\n\t\t\tbackgrounds.updateParallax();\n\n\t\t\tif( overview.isActive() ) {\n\t\t\t\toverview.update();\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Applies layout logic to the contents of all slides in\n\t * the presentation.\n\t *\n\t * @param {string|number} width\n\t * @param {string|number} height\n\t */\n\tfunction layoutSlideContents( width, height ) {\n\n\t\t// Handle sizing of elements with the 'r-stretch' class\n\t\tUtil.queryAll( dom.slides, 'section > .stretch, section > .r-stretch' ).forEach( element => {\n\n\t\t\t// Determine how much vertical space we can use\n\t\t\tlet remainingHeight = Util.getRemainingHeight( element, height );\n\n\t\t\t// Consider the aspect ratio of media elements\n\t\t\tif( /(img|video)/gi.test( element.nodeName ) ) {\n\t\t\t\tconst nw = element.naturalWidth || element.videoWidth,\n\t\t\t\t\t  nh = element.naturalHeight || element.videoHeight;\n\n\t\t\t\tconst es = Math.min( width / nw, remainingHeight / nh );\n\n\t\t\t\telement.style.width = ( nw * es ) + 'px';\n\t\t\t\telement.style.height = ( nh * es ) + 'px';\n\n\t\t\t}\n\t\t\telse {\n\t\t\t\telement.style.width = width + 'px';\n\t\t\t\telement.style.height = remainingHeight + 'px';\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Calculates the computed pixel size of our slides. These\n\t * values are based on the width and height configuration\n\t * options.\n\t *\n\t * @param {number} [presentationWidth=dom.wrapper.offsetWidth]\n\t * @param {number} [presentationHeight=dom.wrapper.offsetHeight]\n\t */\n\tfunction getComputedSlideSize( presentationWidth, presentationHeight ) {\n\n\t\tconst size = {\n\t\t\t// Slide size\n\t\t\twidth: config.width,\n\t\t\theight: config.height,\n\n\t\t\t// Presentation size\n\t\t\tpresentationWidth: presentationWidth || dom.wrapper.offsetWidth,\n\t\t\tpresentationHeight: presentationHeight || dom.wrapper.offsetHeight\n\t\t};\n\n\t\t// Reduce available space by margin\n\t\tsize.presentationWidth -= ( size.presentationWidth * config.margin );\n\t\tsize.presentationHeight -= ( size.presentationHeight * config.margin );\n\n\t\t// Slide width may be a percentage of available width\n\t\tif( typeof size.width === 'string' && /%$/.test( size.width ) ) {\n\t\t\tsize.width = parseInt( size.width, 10 ) / 100 * size.presentationWidth;\n\t\t}\n\n\t\t// Slide height may be a percentage of available height\n\t\tif( typeof size.height === 'string' && /%$/.test( size.height ) ) {\n\t\t\tsize.height = parseInt( size.height, 10 ) / 100 * size.presentationHeight;\n\t\t}\n\n\t\treturn size;\n\n\t}\n\n\t/**\n\t * Stores the vertical index of a stack so that the same\n\t * vertical slide can be selected when navigating to and\n\t * from the stack.\n\t *\n\t * @param {HTMLElement} stack The vertical stack element\n\t * @param {string|number} [v=0] Index to memorize\n\t */\n\tfunction setPreviousVerticalIndex( stack, v ) {\n\n\t\tif( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {\n\t\t\tstack.setAttribute( 'data-previous-indexv', v || 0 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Retrieves the vertical index which was stored using\n\t * #setPreviousVerticalIndex() or 0 if no previous index\n\t * exists.\n\t *\n\t * @param {HTMLElement} stack The vertical stack element\n\t */\n\tfunction getPreviousVerticalIndex( stack ) {\n\n\t\tif( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {\n\t\t\t// Prefer manually defined start-indexv\n\t\t\tconst attributeName = stack.hasAttribute( 'data-start-indexv' ) ? 'data-start-indexv' : 'data-previous-indexv';\n\n\t\t\treturn parseInt( stack.getAttribute( attributeName ) || 0, 10 );\n\t\t}\n\n\t\treturn 0;\n\n\t}\n\n\t/**\n\t * Checks if the current or specified slide is vertical\n\t * (nested within another slide).\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide to check\n\t * orientation of\n\t * @return {Boolean}\n\t */\n\tfunction isVerticalSlide( slide = currentSlide ) {\n\n\t\treturn slide && slide.parentNode && !!slide.parentNode.nodeName.match( /section/i );\n\n\t}\n\n\t/**\n\t * Returns true if we're on the last slide in the current\n\t * vertical stack.\n\t */\n\tfunction isLastVerticalSlide() {\n\n\t\tif( currentSlide && isVerticalSlide( currentSlide ) ) {\n\t\t\t// Does this slide have a next sibling?\n\t\t\tif( currentSlide.nextElementSibling ) return false;\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Returns true if we're currently on the first slide in\n\t * the presentation.\n\t */\n\tfunction isFirstSlide() {\n\n\t\treturn indexh === 0 && indexv === 0;\n\n\t}\n\n\t/**\n\t * Returns true if we're currently on the last slide in\n\t * the presenation. If the last slide is a stack, we only\n\t * consider this the last slide if it's at the end of the\n\t * stack.\n\t */\n\tfunction isLastSlide() {\n\n\t\tif( currentSlide ) {\n\t\t\t// Does this slide have a next sibling?\n\t\t\tif( currentSlide.nextElementSibling ) return false;\n\n\t\t\t// If it's vertical, does its parent have a next sibling?\n\t\t\tif( isVerticalSlide( currentSlide ) && currentSlide.parentNode.nextElementSibling ) return false;\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\n\t}\n\n\t/**\n\t * Enters the paused mode which fades everything on screen to\n\t * black.\n\t */\n\tfunction pause() {\n\n\t\tif( config.pause ) {\n\t\t\tconst wasPaused = dom.wrapper.classList.contains( 'paused' );\n\n\t\t\tcancelAutoSlide();\n\t\t\tdom.wrapper.classList.add( 'paused' );\n\n\t\t\tif( wasPaused === false ) {\n\t\t\t\tdispatchEvent({ type: 'paused' });\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Exits from the paused mode.\n\t */\n\tfunction resume() {\n\n\t\tconst wasPaused = dom.wrapper.classList.contains( 'paused' );\n\t\tdom.wrapper.classList.remove( 'paused' );\n\n\t\tcueAutoSlide();\n\n\t\tif( wasPaused ) {\n\t\t\tdispatchEvent({ type: 'resumed' });\n\t\t}\n\n\t}\n\n\t/**\n\t * Toggles the paused mode on and off.\n\t */\n\tfunction togglePause( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? pause() : resume();\n\t\t}\n\t\telse {\n\t\t\tisPaused() ? resume() : pause();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if we are currently in the paused mode.\n\t *\n\t * @return {Boolean}\n\t */\n\tfunction isPaused() {\n\n\t\treturn dom.wrapper.classList.contains( 'paused' );\n\n\t}\n\n\t/**\n\t * Toggles the auto slide mode on and off.\n\t *\n\t * @param {Boolean} [override] Flag which sets the desired state.\n\t * True means autoplay starts, false means it stops.\n\t */\n\n\tfunction toggleAutoSlide( override ) {\n\n\t\tif( typeof override === 'boolean' ) {\n\t\t\toverride ? resumeAutoSlide() : pauseAutoSlide();\n\t\t}\n\n\t\telse {\n\t\t\tautoSlidePaused ? resumeAutoSlide() : pauseAutoSlide();\n\t\t}\n\n\t}\n\n\t/**\n\t * Checks if the auto slide mode is currently on.\n\t *\n\t * @return {Boolean}\n\t */\n\tfunction isAutoSliding() {\n\n\t\treturn !!( autoSlide && !autoSlidePaused );\n\n\t}\n\n\t/**\n\t * Steps from the current point in the presentation to the\n\t * slide which matches the specified horizontal and vertical\n\t * indices.\n\t *\n\t * @param {number} [h=indexh] Horizontal index of the target slide\n\t * @param {number} [v=indexv] Vertical index of the target slide\n\t * @param {number} [f] Index of a fragment within the\n\t * target slide to activate\n\t * @param {number} [origin] Origin for use in multimaster environments\n\t */\n\tfunction slide( h, v, f, origin ) {\n\n\t\t// Dispatch an event before hte slide\n\t\tconst slidechange = dispatchEvent({\n\t\t\ttype: 'beforeslidechange',\n\t\t\tdata: {\n\t\t\t\tindexh: h === undefined ? indexh : h,\n\t\t\t\tindexv: v === undefined ? indexv : v,\n\t\t\t\torigin\n\t\t\t}\n\t\t});\n\n\t\t// Abort if this slide change was prevented by an event listener\n\t\tif( slidechange.defaultPrevented ) return;\n\n\t\t// Remember where we were at before\n\t\tpreviousSlide = currentSlide;\n\n\t\t// Query all horizontal slides in the deck\n\t\tconst horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );\n\n\t\t// Abort if there are no slides\n\t\tif( horizontalSlides.length === 0 ) return;\n\n\t\t// If no vertical index is specified and the upcoming slide is a\n\t\t// stack, resume at its previous vertical index\n\t\tif( v === undefined && !overview.isActive() ) {\n\t\t\tv = getPreviousVerticalIndex( horizontalSlides[ h ] );\n\t\t}\n\n\t\t// If we were on a vertical stack, remember what vertical index\n\t\t// it was on so we can resume at the same position when returning\n\t\tif( previousSlide && previousSlide.parentNode && previousSlide.parentNode.classList.contains( 'stack' ) ) {\n\t\t\tsetPreviousVerticalIndex( previousSlide.parentNode, indexv );\n\t\t}\n\n\t\t// Remember the state before this slide\n\t\tconst stateBefore = state.concat();\n\n\t\t// Reset the state array\n\t\tstate.length = 0;\n\n\t\tlet indexhBefore = indexh || 0,\n\t\t\tindexvBefore = indexv || 0;\n\n\t\t// Activate and transition to the new slide\n\t\tindexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );\n\t\tindexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );\n\n\t\t// Dispatch an event if the slide changed\n\t\tlet slideChanged = ( indexh !== indexhBefore || indexv !== indexvBefore );\n\n\t\t// Ensure that the previous slide is never the same as the current\n\t\tif( !slideChanged ) previousSlide = null;\n\n\t\t// Find the current horizontal slide and any possible vertical slides\n\t\t// within it\n\t\tlet currentHorizontalSlide = horizontalSlides[ indexh ],\n\t\t\tcurrentVerticalSlides = currentHorizontalSlide.querySelectorAll( 'section' );\n\n\t\t// Store references to the previous and current slides\n\t\tcurrentSlide = currentVerticalSlides[ indexv ] || currentHorizontalSlide;\n\n\t\tlet autoAnimateTransition = false;\n\n\t\t// Detect if we're moving between two auto-animated slides\n\t\tif( slideChanged && previousSlide && currentSlide && !overview.isActive() ) {\n\n\t\t\t// If this is an auto-animated transition, we disable the\n\t\t\t// regular slide transition\n\t\t\t//\n\t\t\t// Note 20-03-2020:\n\t\t\t// This needs to happen before we update slide visibility,\n\t\t\t// otherwise transitions will still run in Safari.\n\t\t\tif( previousSlide.hasAttribute( 'data-auto-animate' ) && currentSlide.hasAttribute( 'data-auto-animate' )\n\t\t\t\t\t&& previousSlide.getAttribute( 'data-auto-animate-id' ) === currentSlide.getAttribute( 'data-auto-animate-id' )\n\t\t\t\t\t&& !( ( indexh > indexhBefore || indexv > indexvBefore ) ? currentSlide : previousSlide ).hasAttribute( 'data-auto-animate-restart' ) ) {\n\n\t\t\t\tautoAnimateTransition = true;\n\t\t\t\tdom.slides.classList.add( 'disable-slide-transitions' );\n\t\t\t}\n\n\t\t\ttransition = 'running';\n\n\t\t}\n\n\t\t// Update the visibility of slides now that the indices have changed\n\t\tupdateSlidesVisibility();\n\n\t\tlayout();\n\n\t\t// Update the overview if it's currently active\n\t\tif( overview.isActive() ) {\n\t\t\toverview.update();\n\t\t}\n\n\t\t// Show fragment, if specified\n\t\tif( typeof f !== 'undefined' ) {\n\t\t\tfragments.goto( f );\n\t\t}\n\n\t\t// Solves an edge case where the previous slide maintains the\n\t\t// 'present' class when navigating between adjacent vertical\n\t\t// stacks\n\t\tif( previousSlide && previousSlide !== currentSlide ) {\n\t\t\tpreviousSlide.classList.remove( 'present' );\n\t\t\tpreviousSlide.setAttribute( 'aria-hidden', 'true' );\n\n\t\t\t// Reset all slides upon navigate to home\n\t\t\tif( isFirstSlide() ) {\n\t\t\t\t// Launch async task\n\t\t\t\tsetTimeout( () => {\n\t\t\t\t\tgetVerticalStacks().forEach( slide => {\n\t\t\t\t\t\tsetPreviousVerticalIndex( slide, 0 );\n\t\t\t\t\t} );\n\t\t\t\t}, 0 );\n\t\t\t}\n\t\t}\n\n\t\t// Apply the new state\n\t\tstateLoop: for( let i = 0, len = state.length; i < len; i++ ) {\n\t\t\t// Check if this state existed on the previous slide. If it\n\t\t\t// did, we will avoid adding it repeatedly\n\t\t\tfor( let j = 0; j < stateBefore.length; j++ ) {\n\t\t\t\tif( stateBefore[j] === state[i] ) {\n\t\t\t\t\tstateBefore.splice( j, 1 );\n\t\t\t\t\tcontinue stateLoop;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdom.viewport.classList.add( state[i] );\n\n\t\t\t// Dispatch custom event matching the state's name\n\t\t\tdispatchEvent({ type: state[i] });\n\t\t}\n\n\t\t// Clean up the remains of the previous state\n\t\twhile( stateBefore.length ) {\n\t\t\tdom.viewport.classList.remove( stateBefore.pop() );\n\t\t}\n\n\t\tif( slideChanged ) {\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'slidechanged',\n\t\t\t\tdata: {\n\t\t\t\t\tindexh,\n\t\t\t\t\tindexv,\n\t\t\t\t\tpreviousSlide,\n\t\t\t\t\tcurrentSlide,\n\t\t\t\t\torigin\n\t\t\t\t}\n\t\t\t});\n\t\t}\n\n\t\t// Handle embedded content\n\t\tif( slideChanged || !previousSlide ) {\n\t\t\tslideContent.stopEmbeddedContent( previousSlide );\n\t\t\tslideContent.startEmbeddedContent( currentSlide );\n\t\t}\n\n\t\t// Announce the current slide contents to screen readers\n\t\t// Use animation frame to prevent getComputedStyle in getStatusText\n\t\t// from triggering layout mid-frame\n\t\trequestAnimationFrame( () => {\n\t\t\tannounceStatus( getStatusText( currentSlide ) );\n\t\t});\n\n\t\tprogress.update();\n\t\tcontrols.update();\n\t\tnotes.update();\n\t\tbackgrounds.update();\n\t\tbackgrounds.updateParallax();\n\t\tslideNumber.update();\n\t\tfragments.update();\n\n\t\t// Update the URL hash\n\t\tlocation.writeURL();\n\n\t\tcueAutoSlide();\n\n\t\t// Auto-animation\n\t\tif( autoAnimateTransition ) {\n\n\t\t\tsetTimeout( () => {\n\t\t\t\tdom.slides.classList.remove( 'disable-slide-transitions' );\n\t\t\t}, 0 );\n\n\t\t\tif( config.autoAnimate ) {\n\t\t\t\t// Run the auto-animation between our slides\n\t\t\t\tautoAnimate.run( previousSlide, currentSlide );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Syncs the presentation with the current DOM. Useful\n\t * when new slides or control elements are added or when\n\t * the configuration has changed.\n\t */\n\tfunction sync() {\n\n\t\t// Subscribe to input\n\t\tremoveEventListeners();\n\t\taddEventListeners();\n\n\t\t// Force a layout to make sure the current config is accounted for\n\t\tlayout();\n\n\t\t// Reflect the current autoSlide value\n\t\tautoSlide = config.autoSlide;\n\n\t\t// Start auto-sliding if it's enabled\n\t\tcueAutoSlide();\n\n\t\t// Re-create all slide backgrounds\n\t\tbackgrounds.create();\n\n\t\t// Write the current hash to the URL\n\t\tlocation.writeURL();\n\n\t\tfragments.sortAll();\n\n\t\tcontrols.update();\n\t\tprogress.update();\n\n\t\tupdateSlidesVisibility();\n\n\t\tnotes.update();\n\t\tnotes.updateVisibility();\n\t\tbackgrounds.update( true );\n\t\tslideNumber.update();\n\t\tslideContent.formatEmbeddedContent();\n\n\t\t// Start or stop embedded content depending on global config\n\t\tif( config.autoPlayMedia === false ) {\n\t\t\tslideContent.stopEmbeddedContent( currentSlide, { unloadIframes: false } );\n\t\t}\n\t\telse {\n\t\t\tslideContent.startEmbeddedContent( currentSlide );\n\t\t}\n\n\t\tif( overview.isActive() ) {\n\t\t\toverview.layout();\n\t\t}\n\n\t}\n\n\t/**\n\t * Updates reveal.js to keep in sync with new slide attributes. For\n\t * example, if you add a new `data-background-image` you can call\n\t * this to have reveal.js render the new background image.\n\t *\n\t * Similar to #sync() but more efficient when you only need to\n\t * refresh a specific slide.\n\t *\n\t * @param {HTMLElement} slide\n\t */\n\tfunction syncSlide( slide = currentSlide ) {\n\n\t\tbackgrounds.sync( slide );\n\t\tfragments.sync( slide );\n\n\t\tslideContent.load( slide );\n\n\t\tbackgrounds.update();\n\t\tnotes.update();\n\n\t}\n\n\t/**\n\t * Resets all vertical slides so that only the first\n\t * is visible.\n\t */\n\tfunction resetVerticalSlides() {\n\n\t\tgetHorizontalSlides().forEach( horizontalSlide => {\n\n\t\t\tUtil.queryAll( horizontalSlide, 'section' ).forEach( ( verticalSlide, y ) => {\n\n\t\t\t\tif( y > 0 ) {\n\t\t\t\t\tverticalSlide.classList.remove( 'present' );\n\t\t\t\t\tverticalSlide.classList.remove( 'past' );\n\t\t\t\t\tverticalSlide.classList.add( 'future' );\n\t\t\t\t\tverticalSlide.setAttribute( 'aria-hidden', 'true' );\n\t\t\t\t}\n\n\t\t\t} );\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Randomly shuffles all slides in the deck.\n\t */\n\tfunction shuffle( slides = getHorizontalSlides() ) {\n\n\t\tslides.forEach( ( slide, i ) => {\n\n\t\t\t// Insert the slide next to a randomly picked sibling slide\n\t\t\t// slide. This may cause the slide to insert before itself,\n\t\t\t// but that's not an issue.\n\t\t\tlet beforeSlide = slides[ Math.floor( Math.random() * slides.length ) ];\n\t\t\tif( beforeSlide.parentNode === slide.parentNode ) {\n\t\t\t\tslide.parentNode.insertBefore( slide, beforeSlide );\n\t\t\t}\n\n\t\t\t// Randomize the order of vertical slides (if there are any)\n\t\t\tlet verticalSlides = slide.querySelectorAll( 'section' );\n\t\t\tif( verticalSlides.length ) {\n\t\t\t\tshuffle( verticalSlides );\n\t\t\t}\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Updates one dimension of slides by showing the slide\n\t * with the specified index.\n\t *\n\t * @param {string} selector A CSS selector that will fetch\n\t * the group of slides we are working with\n\t * @param {number} index The index of the slide that should be\n\t * shown\n\t *\n\t * @return {number} The index of the slide that is now shown,\n\t * might differ from the passed in index if it was out of\n\t * bounds.\n\t */\n\tfunction updateSlides( selector, index ) {\n\n\t\t// Select all slides and convert the NodeList result to\n\t\t// an array\n\t\tlet slides = Util.queryAll( dom.wrapper, selector ),\n\t\t\tslidesLength = slides.length;\n\n\t\tlet printMode = print.isPrintingPDF();\n\t\tlet loopedForwards = false;\n\t\tlet loopedBackwards = false;\n\n\t\tif( slidesLength ) {\n\n\t\t\t// Should the index loop?\n\t\t\tif( config.loop ) {\n\t\t\t\tif( index >= slidesLength ) loopedForwards = true;\n\n\t\t\t\tindex %= slidesLength;\n\n\t\t\t\tif( index < 0 ) {\n\t\t\t\t\tindex = slidesLength + index;\n\t\t\t\t\tloopedBackwards = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Enforce max and minimum index bounds\n\t\t\tindex = Math.max( Math.min( index, slidesLength - 1 ), 0 );\n\n\t\t\tfor( let i = 0; i < slidesLength; i++ ) {\n\t\t\t\tlet element = slides[i];\n\n\t\t\t\tlet reverse = config.rtl && !isVerticalSlide( element );\n\n\t\t\t\t// Avoid .remove() with multiple args for IE11 support\n\t\t\t\telement.classList.remove( 'past' );\n\t\t\t\telement.classList.remove( 'present' );\n\t\t\t\telement.classList.remove( 'future' );\n\n\t\t\t\t// http://www.w3.org/html/wg/drafts/html/master/editing.html#the-hidden-attribute\n\t\t\t\telement.setAttribute( 'hidden', '' );\n\t\t\t\telement.setAttribute( 'aria-hidden', 'true' );\n\n\t\t\t\t// If this element contains vertical slides\n\t\t\t\tif( element.querySelector( 'section' ) ) {\n\t\t\t\t\telement.classList.add( 'stack' );\n\t\t\t\t}\n\n\t\t\t\t// If we're printing static slides, all slides are \"present\"\n\t\t\t\tif( printMode ) {\n\t\t\t\t\telement.classList.add( 'present' );\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif( i < index ) {\n\t\t\t\t\t// Any element previous to index is given the 'past' class\n\t\t\t\t\telement.classList.add( reverse ? 'future' : 'past' );\n\n\t\t\t\t\tif( config.fragments ) {\n\t\t\t\t\t\t// Show all fragments in prior slides\n\t\t\t\t\t\tshowFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if( i > index ) {\n\t\t\t\t\t// Any element subsequent to index is given the 'future' class\n\t\t\t\t\telement.classList.add( reverse ? 'past' : 'future' );\n\n\t\t\t\t\tif( config.fragments ) {\n\t\t\t\t\t\t// Hide all fragments in future slides\n\t\t\t\t\t\thideFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Update the visibility of fragments when a presentation loops\n\t\t\t\t// in either direction\n\t\t\t\telse if( i === index && config.fragments ) {\n\t\t\t\t\tif( loopedForwards ) {\n\t\t\t\t\t\thideFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t\telse if( loopedBackwards ) {\n\t\t\t\t\t\tshowFragmentsIn( element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tlet slide = slides[index];\n\t\t\tlet wasPresent = slide.classList.contains( 'present' );\n\n\t\t\t// Mark the current slide as present\n\t\t\tslide.classList.add( 'present' );\n\t\t\tslide.removeAttribute( 'hidden' );\n\t\t\tslide.removeAttribute( 'aria-hidden' );\n\n\t\t\tif( !wasPresent ) {\n\t\t\t\t// Dispatch an event indicating the slide is now visible\n\t\t\t\tdispatchEvent({\n\t\t\t\t\ttarget: slide,\n\t\t\t\t\ttype: 'visible',\n\t\t\t\t\tbubbles: false\n\t\t\t\t});\n\t\t\t}\n\n\t\t\t// If this slide has a state associated with it, add it\n\t\t\t// onto the current state of the deck\n\t\t\tlet slideState = slide.getAttribute( 'data-state' );\n\t\t\tif( slideState ) {\n\t\t\t\tstate = state.concat( slideState.split( ' ' ) );\n\t\t\t}\n\n\t\t}\n\t\telse {\n\t\t\t// Since there are no slides we can't be anywhere beyond the\n\t\t\t// zeroth index\n\t\t\tindex = 0;\n\t\t}\n\n\t\treturn index;\n\n\t}\n\n\t/**\n\t * Shows all fragment elements within the given contaienr.\n\t */\n\tfunction showFragmentsIn( container ) {\n\n\t\tUtil.queryAll( container, '.fragment' ).forEach( fragment => {\n\t\t\tfragment.classList.add( 'visible' );\n\t\t\tfragment.classList.remove( 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Hides all fragment elements within the given contaienr.\n\t */\n\tfunction hideFragmentsIn( container ) {\n\n\t\tUtil.queryAll( container, '.fragment.visible' ).forEach( fragment => {\n\t\t\tfragment.classList.remove( 'visible', 'current-fragment' );\n\t\t} );\n\n\t}\n\n\t/**\n\t * Optimization method; hide all slides that are far away\n\t * from the present slide.\n\t */\n\tfunction updateSlidesVisibility() {\n\n\t\t// Select all slides and convert the NodeList result to\n\t\t// an array\n\t\tlet horizontalSlides = getHorizontalSlides(),\n\t\t\thorizontalSlidesLength = horizontalSlides.length,\n\t\t\tdistanceX,\n\t\t\tdistanceY;\n\n\t\tif( horizontalSlidesLength && typeof indexh !== 'undefined' ) {\n\n\t\t\t// The number of steps away from the present slide that will\n\t\t\t// be visible\n\t\t\tlet viewDistance = overview.isActive() ? 10 : config.viewDistance;\n\n\t\t\t// Shorten the view distance on devices that typically have\n\t\t\t// less resources\n\t\t\tif( Device.isMobile ) {\n\t\t\t\tviewDistance = overview.isActive() ? 6 : config.mobileViewDistance;\n\t\t\t}\n\n\t\t\t// All slides need to be visible when exporting to PDF\n\t\t\tif( print.isPrintingPDF() ) {\n\t\t\t\tviewDistance = Number.MAX_VALUE;\n\t\t\t}\n\n\t\t\tfor( let x = 0; x < horizontalSlidesLength; x++ ) {\n\t\t\t\tlet horizontalSlide = horizontalSlides[x];\n\n\t\t\t\tlet verticalSlides = Util.queryAll( horizontalSlide, 'section' ),\n\t\t\t\t\tverticalSlidesLength = verticalSlides.length;\n\n\t\t\t\t// Determine how far away this slide is from the present\n\t\t\t\tdistanceX = Math.abs( ( indexh || 0 ) - x ) || 0;\n\n\t\t\t\t// If the presentation is looped, distance should measure\n\t\t\t\t// 1 between the first and last slides\n\t\t\t\tif( config.loop ) {\n\t\t\t\t\tdistanceX = Math.abs( ( ( indexh || 0 ) - x ) % ( horizontalSlidesLength - viewDistance ) ) || 0;\n\t\t\t\t}\n\n\t\t\t\t// Show the horizontal slide if it's within the view distance\n\t\t\t\tif( distanceX < viewDistance ) {\n\t\t\t\t\tslideContent.load( horizontalSlide );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tslideContent.unload( horizontalSlide );\n\t\t\t\t}\n\n\t\t\t\tif( verticalSlidesLength ) {\n\n\t\t\t\t\tlet oy = getPreviousVerticalIndex( horizontalSlide );\n\n\t\t\t\t\tfor( let y = 0; y < verticalSlidesLength; y++ ) {\n\t\t\t\t\t\tlet verticalSlide = verticalSlides[y];\n\n\t\t\t\t\t\tdistanceY = x === ( indexh || 0 ) ? Math.abs( ( indexv || 0 ) - y ) : Math.abs( y - oy );\n\n\t\t\t\t\t\tif( distanceX + distanceY < viewDistance ) {\n\t\t\t\t\t\t\tslideContent.load( verticalSlide );\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tslideContent.unload( verticalSlide );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Flag if there are ANY vertical slides, anywhere in the deck\n\t\t\tif( hasVerticalSlides() ) {\n\t\t\t\tdom.wrapper.classList.add( 'has-vertical-slides' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tdom.wrapper.classList.remove( 'has-vertical-slides' );\n\t\t\t}\n\n\t\t\t// Flag if there are ANY horizontal slides, anywhere in the deck\n\t\t\tif( hasHorizontalSlides() ) {\n\t\t\t\tdom.wrapper.classList.add( 'has-horizontal-slides' );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tdom.wrapper.classList.remove( 'has-horizontal-slides' );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Determine what available routes there are for navigation.\n\t *\n\t * @return {{left: boolean, right: boolean, up: boolean, down: boolean}}\n\t */\n\tfunction availableRoutes({ includeFragments = false } = {}) {\n\n\t\tlet horizontalSlides = dom.wrapper.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ),\n\t\t\tverticalSlides = dom.wrapper.querySelectorAll( VERTICAL_SLIDES_SELECTOR );\n\n\t\tlet routes = {\n\t\t\tleft: indexh > 0,\n\t\t\tright: indexh < horizontalSlides.length - 1,\n\t\t\tup: indexv > 0,\n\t\t\tdown: indexv < verticalSlides.length - 1\n\t\t};\n\n\t\t// Looped presentations can always be navigated as long as\n\t\t// there are slides available\n\t\tif( config.loop ) {\n\t\t\tif( horizontalSlides.length > 1 ) {\n\t\t\t\troutes.left = true;\n\t\t\t\troutes.right = true;\n\t\t\t}\n\n\t\t\tif( verticalSlides.length > 1 ) {\n\t\t\t\troutes.up = true;\n\t\t\t\troutes.down = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( horizontalSlides.length > 1 && config.navigationMode === 'linear' ) {\n\t\t\troutes.right = routes.right || routes.down;\n\t\t\troutes.left = routes.left || routes.up;\n\t\t}\n\n\t\t// If includeFragments is set, a route will be considered\n\t\t// availalbe if either a slid OR fragment is available in\n\t\t// the given direction\n\t\tif( includeFragments === true ) {\n\t\t\tlet fragmentRoutes = fragments.availableRoutes();\n\t\t\troutes.left = routes.left || fragmentRoutes.prev;\n\t\t\troutes.up = routes.up || fragmentRoutes.prev;\n\t\t\troutes.down = routes.down || fragmentRoutes.next;\n\t\t\troutes.right = routes.right || fragmentRoutes.next;\n\t\t}\n\n\t\t// Reverse horizontal controls for rtl\n\t\tif( config.rtl ) {\n\t\t\tlet left = routes.left;\n\t\t\troutes.left = routes.right;\n\t\t\troutes.right = left;\n\t\t}\n\n\t\treturn routes;\n\n\t}\n\n\t/**\n\t * Returns the number of past slides. This can be used as a global\n\t * flattened index for slides.\n\t *\n\t * @param {HTMLElement} [slide=currentSlide] The slide we're counting before\n\t *\n\t * @return {number} Past slide count\n\t */\n\tfunction getSlidePastCount( slide = currentSlide ) {\n\n\t\tlet horizontalSlides = getHorizontalSlides();\n\n\t\t// The number of past slides\n\t\tlet pastCount = 0;\n\n\t\t// Step through all slides and count the past ones\n\t\tmainLoop: for( let i = 0; i < horizontalSlides.length; i++ ) {\n\n\t\t\tlet horizontalSlide = horizontalSlides[i];\n\t\t\tlet verticalSlides = horizontalSlide.querySelectorAll( 'section' );\n\n\t\t\tfor( let j = 0; j < verticalSlides.length; j++ ) {\n\n\t\t\t\t// Stop as soon as we arrive at the present\n\t\t\t\tif( verticalSlides[j] === slide ) {\n\t\t\t\t\tbreak mainLoop;\n\t\t\t\t}\n\n\t\t\t\t// Don't count slides with the \"uncounted\" class\n\t\t\t\tif( verticalSlides[j].dataset.visibility !== 'uncounted' ) {\n\t\t\t\t\tpastCount++;\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t\t// Stop as soon as we arrive at the present\n\t\t\tif( horizontalSlide === slide ) {\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\t// Don't count the wrapping section for vertical slides and\n\t\t\t// slides marked as uncounted\n\t\t\tif( horizontalSlide.classList.contains( 'stack' ) === false && horizontalSlide.dataset.visibility !== 'uncounted' ) {\n\t\t\t\tpastCount++;\n\t\t\t}\n\n\t\t}\n\n\t\treturn pastCount;\n\n\t}\n\n\t/**\n\t * Returns a value ranging from 0-1 that represents\n\t * how far into the presentation we have navigated.\n\t *\n\t * @return {number}\n\t */\n\tfunction getProgress() {\n\n\t\t// The number of past and total slides\n\t\tlet totalCount = getTotalSlides();\n\t\tlet pastCount = getSlidePastCount();\n\n\t\tif( currentSlide ) {\n\n\t\t\tlet allFragments = currentSlide.querySelectorAll( '.fragment' );\n\n\t\t\t// If there are fragments in the current slide those should be\n\t\t\t// accounted for in the progress.\n\t\t\tif( allFragments.length > 0 ) {\n\t\t\t\tlet visibleFragments = currentSlide.querySelectorAll( '.fragment.visible' );\n\n\t\t\t\t// This value represents how big a portion of the slide progress\n\t\t\t\t// that is made up by its fragments (0-1)\n\t\t\t\tlet fragmentWeight = 0.9;\n\n\t\t\t\t// Add fragment progress to the past slide count\n\t\t\t\tpastCount += ( visibleFragments.length / allFragments.length ) * fragmentWeight;\n\t\t\t}\n\n\t\t}\n\n\t\treturn Math.min( pastCount / ( totalCount - 1 ), 1 );\n\n\t}\n\n\t/**\n\t * Retrieves the h/v location and fragment of the current,\n\t * or specified, slide.\n\t *\n\t * @param {HTMLElement} [slide] If specified, the returned\n\t * index will be for this slide rather than the currently\n\t * active one\n\t *\n\t * @return {{h: number, v: number, f: number}}\n\t */\n\tfunction getIndices( slide ) {\n\n\t\t// By default, return the current indices\n\t\tlet h = indexh,\n\t\t\tv = indexv,\n\t\t\tf;\n\n\t\t// If a slide is specified, return the indices of that slide\n\t\tif( slide ) {\n\t\t\tlet isVertical = isVerticalSlide( slide );\n\t\t\tlet slideh = isVertical ? slide.parentNode : slide;\n\n\t\t\t// Select all horizontal slides\n\t\t\tlet horizontalSlides = getHorizontalSlides();\n\n\t\t\t// Now that we know which the horizontal slide is, get its index\n\t\t\th = Math.max( horizontalSlides.indexOf( slideh ), 0 );\n\n\t\t\t// Assume we're not vertical\n\t\t\tv = undefined;\n\n\t\t\t// If this is a vertical slide, grab the vertical index\n\t\t\tif( isVertical ) {\n\t\t\t\tv = Math.max( Util.queryAll( slide.parentNode, 'section' ).indexOf( slide ), 0 );\n\t\t\t}\n\t\t}\n\n\t\tif( !slide && currentSlide ) {\n\t\t\tlet hasFragments = currentSlide.querySelectorAll( '.fragment' ).length > 0;\n\t\t\tif( hasFragments ) {\n\t\t\t\tlet currentFragment = currentSlide.querySelector( '.current-fragment' );\n\t\t\t\tif( currentFragment && currentFragment.hasAttribute( 'data-fragment-index' ) ) {\n\t\t\t\t\tf = parseInt( currentFragment.getAttribute( 'data-fragment-index' ), 10 );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tf = currentSlide.querySelectorAll( '.fragment.visible' ).length - 1;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn { h, v, f };\n\n\t}\n\n\t/**\n\t * Retrieves all slides in this presentation.\n\t */\n\tfunction getSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, SLIDES_SELECTOR + ':not(.stack):not([data-visibility=\"uncounted\"])' );\n\n\t}\n\n\t/**\n\t * Returns a list of all horizontal slides in the deck. Each\n\t * vertical stack is included as one horizontal slide in the\n\t * resulting array.\n\t */\n\tfunction getHorizontalSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR );\n\n\t}\n\n\t/**\n\t * Returns all vertical slides that exist within this deck.\n\t */\n\tfunction getVerticalSlides() {\n\n\t\treturn Util.queryAll( dom.wrapper, '.slides>section>section' );\n\n\t}\n\n\t/**\n\t * Returns all vertical stacks (each stack can contain multiple slides).\n\t */\n\tfunction getVerticalStacks() {\n\n\t\treturn Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.stack');\n\n\t}\n\n\t/**\n\t * Returns true if there are at least two horizontal slides.\n\t */\n\tfunction hasHorizontalSlides() {\n\n\t\treturn getHorizontalSlides().length > 1;\n\t}\n\n\t/**\n\t * Returns true if there are at least two vertical slides.\n\t */\n\tfunction hasVerticalSlides() {\n\n\t\treturn getVerticalSlides().length > 1;\n\n\t}\n\n\t/**\n\t * Returns an array of objects where each object represents the\n\t * attributes on its respective slide.\n\t */\n\tfunction getSlidesAttributes() {\n\n\t\treturn getSlides().map( slide => {\n\n\t\t\tlet attributes = {};\n\t\t\tfor( let i = 0; i < slide.attributes.length; i++ ) {\n\t\t\t\tlet attribute = slide.attributes[ i ];\n\t\t\t\tattributes[ attribute.name ] = attribute.value;\n\t\t\t}\n\t\t\treturn attributes;\n\n\t\t} );\n\n\t}\n\n\t/**\n\t * Retrieves the total number of slides in this presentation.\n\t *\n\t * @return {number}\n\t */\n\tfunction getTotalSlides() {\n\n\t\treturn getSlides().length;\n\n\t}\n\n\t/**\n\t * Returns the slide element matching the specified index.\n\t *\n\t * @return {HTMLElement}\n\t */\n\tfunction getSlide( x, y ) {\n\n\t\tlet horizontalSlide = getHorizontalSlides()[ x ];\n\t\tlet verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );\n\n\t\tif( verticalSlides && verticalSlides.length && typeof y === 'number' ) {\n\t\t\treturn verticalSlides ? verticalSlides[ y ] : undefined;\n\t\t}\n\n\t\treturn horizontalSlide;\n\n\t}\n\n\t/**\n\t * Returns the background element for the given slide.\n\t * All slides, even the ones with no background properties\n\t * defined, have a background element so as long as the\n\t * index is valid an element will be returned.\n\t *\n\t * @param {mixed} x Horizontal background index OR a slide\n\t * HTML element\n\t * @param {number} y Vertical background index\n\t * @return {(HTMLElement[]|*)}\n\t */\n\tfunction getSlideBackground( x, y ) {\n\n\t\tlet slide = typeof x === 'number' ? getSlide( x, y ) : x;\n\t\tif( slide ) {\n\t\t\treturn slide.slideBackgroundElement;\n\t\t}\n\n\t\treturn undefined;\n\n\t}\n\n\t/**\n\t * Retrieves the current state of the presentation as\n\t * an object. This state can then be restored at any\n\t * time.\n\t *\n\t * @return {{indexh: number, indexv: number, indexf: number, paused: boolean, overview: boolean}}\n\t */\n\tfunction getState() {\n\n\t\tlet indices = getIndices();\n\n\t\treturn {\n\t\t\tindexh: indices.h,\n\t\t\tindexv: indices.v,\n\t\t\tindexf: indices.f,\n\t\t\tpaused: isPaused(),\n\t\t\toverview: overview.isActive()\n\t\t};\n\n\t}\n\n\t/**\n\t * Restores the presentation to the given state.\n\t *\n\t * @param {object} state As generated by getState()\n\t * @see {@link getState} generates the parameter `state`\n\t */\n\tfunction setState( state ) {\n\n\t\tif( typeof state === 'object' ) {\n\t\t\tslide( Util.deserialize( state.indexh ), Util.deserialize( state.indexv ), Util.deserialize( state.indexf ) );\n\n\t\t\tlet pausedFlag = Util.deserialize( state.paused ),\n\t\t\t\toverviewFlag = Util.deserialize( state.overview );\n\n\t\t\tif( typeof pausedFlag === 'boolean' && pausedFlag !== isPaused() ) {\n\t\t\t\ttogglePause( pausedFlag );\n\t\t\t}\n\n\t\t\tif( typeof overviewFlag === 'boolean' && overviewFlag !== overview.isActive() ) {\n\t\t\t\toverview.toggle( overviewFlag );\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Cues a new automated slide if enabled in the config.\n\t */\n\tfunction cueAutoSlide() {\n\n\t\tcancelAutoSlide();\n\n\t\tif( currentSlide && config.autoSlide !== false ) {\n\n\t\t\tlet fragment = currentSlide.querySelector( '.current-fragment' );\n\n\t\t\t// When the slide first appears there is no \"current\" fragment so\n\t\t\t// we look for a data-autoslide timing on the first fragment\n\t\t\tif( !fragment ) fragment = currentSlide.querySelector( '.fragment' );\n\n\t\t\tlet fragmentAutoSlide = fragment ? fragment.getAttribute( 'data-autoslide' ) : null;\n\t\t\tlet parentAutoSlide = currentSlide.parentNode ? currentSlide.parentNode.getAttribute( 'data-autoslide' ) : null;\n\t\t\tlet slideAutoSlide = currentSlide.getAttribute( 'data-autoslide' );\n\n\t\t\t// Pick value in the following priority order:\n\t\t\t// 1. Current fragment's data-autoslide\n\t\t\t// 2. Current slide's data-autoslide\n\t\t\t// 3. Parent slide's data-autoslide\n\t\t\t// 4. Global autoSlide setting\n\t\t\tif( fragmentAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( fragmentAutoSlide, 10 );\n\t\t\t}\n\t\t\telse if( slideAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( slideAutoSlide, 10 );\n\t\t\t}\n\t\t\telse if( parentAutoSlide ) {\n\t\t\t\tautoSlide = parseInt( parentAutoSlide, 10 );\n\t\t\t}\n\t\t\telse {\n\t\t\t\tautoSlide = config.autoSlide;\n\n\t\t\t\t// If there are media elements with data-autoplay,\n\t\t\t\t// automatically set the autoSlide duration to the\n\t\t\t\t// length of that media. Not applicable if the slide\n\t\t\t\t// is divided up into fragments.\n\t\t\t\t// playbackRate is accounted for in the duration.\n\t\t\t\tif( currentSlide.querySelectorAll( '.fragment' ).length === 0 ) {\n\t\t\t\t\tUtil.queryAll( currentSlide, 'video, audio' ).forEach( el => {\n\t\t\t\t\t\tif( el.hasAttribute( 'data-autoplay' ) ) {\n\t\t\t\t\t\t\tif( autoSlide && (el.duration * 1000 / el.playbackRate ) > autoSlide ) {\n\t\t\t\t\t\t\t\tautoSlide = ( el.duration * 1000 / el.playbackRate ) + 1000;\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Cue the next auto-slide if:\n\t\t\t// - There is an autoSlide value\n\t\t\t// - Auto-sliding isn't paused by the user\n\t\t\t// - The presentation isn't paused\n\t\t\t// - The overview isn't active\n\t\t\t// - The presentation isn't over\n\t\t\tif( autoSlide && !autoSlidePaused && !isPaused() && !overview.isActive() && ( !isLastSlide() || fragments.availableRoutes().next || config.loop === true ) ) {\n\t\t\t\tautoSlideTimeout = setTimeout( () => {\n\t\t\t\t\tif( typeof config.autoSlideMethod === 'function' ) {\n\t\t\t\t\t\tconfig.autoSlideMethod()\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tnavigateNext();\n\t\t\t\t\t}\n\t\t\t\t\tcueAutoSlide();\n\t\t\t\t}, autoSlide );\n\t\t\t\tautoSlideStartTime = Date.now();\n\t\t\t}\n\n\t\t\tif( autoSlidePlayer ) {\n\t\t\t\tautoSlidePlayer.setPlaying( autoSlideTimeout !== -1 );\n\t\t\t}\n\n\t\t}\n\n\t}\n\n\t/**\n\t * Cancels any ongoing request to auto-slide.\n\t */\n\tfunction cancelAutoSlide() {\n\n\t\tclearTimeout( autoSlideTimeout );\n\t\tautoSlideTimeout = -1;\n\n\t}\n\n\tfunction pauseAutoSlide() {\n\n\t\tif( autoSlide && !autoSlidePaused ) {\n\t\t\tautoSlidePaused = true;\n\t\t\tdispatchEvent({ type: 'autoslidepaused' });\n\t\t\tclearTimeout( autoSlideTimeout );\n\n\t\t\tif( autoSlidePlayer ) {\n\t\t\t\tautoSlidePlayer.setPlaying( false );\n\t\t\t}\n\t\t}\n\n\t}\n\n\tfunction resumeAutoSlide() {\n\n\t\tif( autoSlide && autoSlidePaused ) {\n\t\t\tautoSlidePaused = false;\n\t\t\tdispatchEvent({ type: 'autoslideresumed' });\n\t\t\tcueAutoSlide();\n\t\t}\n\n\t}\n\n\tfunction navigateLeft({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\n\t\t// Reverse for RTL\n\t\tif( config.rtl ) {\n\t\t\tif( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().left ) {\n\t\t\t\tslide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t\t}\n\t\t}\n\t\t// Normal navigation\n\t\telse if( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().left ) {\n\t\t\tslide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t}\n\n\t}\n\n\tfunction navigateRight({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\n\t\t// Reverse for RTL\n\t\tif( config.rtl ) {\n\t\t\tif( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().right ) {\n\t\t\t\tslide( indexh - 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t\t}\n\t\t}\n\t\t// Normal navigation\n\t\telse if( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().right ) {\n\t\t\tslide( indexh + 1, config.navigationMode === 'grid' ? indexv : undefined );\n\t\t}\n\n\t}\n\n\tfunction navigateUp({skipFragments=false}={}) {\n\n\t\t// Prioritize hiding fragments\n\t\tif( ( overview.isActive() || skipFragments || fragments.prev() === false ) && availableRoutes().up ) {\n\t\t\tslide( indexh, indexv - 1 );\n\t\t}\n\n\t}\n\n\tfunction navigateDown({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedVertically = true;\n\n\t\t// Prioritize revealing fragments\n\t\tif( ( overview.isActive() || skipFragments || fragments.next() === false ) && availableRoutes().down ) {\n\t\t\tslide( indexh, indexv + 1 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Navigates backwards, prioritized in the following order:\n\t * 1) Previous fragment\n\t * 2) Previous vertical slide\n\t * 3) Previous horizontal slide\n\t */\n\tfunction navigatePrev({skipFragments=false}={}) {\n\n\t\t// Prioritize revealing fragments\n\t\tif( skipFragments || fragments.prev() === false ) {\n\t\t\tif( availableRoutes().up ) {\n\t\t\t\tnavigateUp({skipFragments});\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// Fetch the previous horizontal slide, if there is one\n\t\t\t\tlet previousSlide;\n\n\t\t\t\tif( config.rtl ) {\n\t\t\t\t\tpreviousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.future' ).pop();\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tpreviousSlide = Util.queryAll( dom.wrapper, HORIZONTAL_SLIDES_SELECTOR + '.past' ).pop();\n\t\t\t\t}\n\n\t\t\t\t// When going backwards and arriving on a stack we start\n\t\t\t\t// at the bottom of the stack\n\t\t\t\tif( previousSlide && previousSlide.classList.contains( 'stack' ) ) {\n\t\t\t\t\tlet v = ( previousSlide.querySelectorAll( 'section' ).length - 1 ) || undefined;\n\t\t\t\t\tlet h = indexh - 1;\n\t\t\t\t\tslide( h, v );\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tnavigateLeft({skipFragments});\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * The reverse of #navigatePrev().\n\t */\n\tfunction navigateNext({skipFragments=false}={}) {\n\n\t\tnavigationHistory.hasNavigatedHorizontally = true;\n\t\tnavigationHistory.hasNavigatedVertically = true;\n\n\t\t// Prioritize revealing fragments\n\t\tif( skipFragments || fragments.next() === false ) {\n\n\t\t\tlet routes = availableRoutes();\n\n\t\t\t// When looping is enabled `routes.down` is always available\n\t\t\t// so we need a separate check for when we've reached the\n\t\t\t// end of a stack and should move horizontally\n\t\t\tif( routes.down && routes.right && config.loop && isLastVerticalSlide() ) {\n\t\t\t\troutes.down = false;\n\t\t\t}\n\n\t\t\tif( routes.down ) {\n\t\t\t\tnavigateDown({skipFragments});\n\t\t\t}\n\t\t\telse if( config.rtl ) {\n\t\t\t\tnavigateLeft({skipFragments});\n\t\t\t}\n\t\t\telse {\n\t\t\t\tnavigateRight({skipFragments});\n\t\t\t}\n\t\t}\n\n\t}\n\n\n\t// --------------------------------------------------------------------//\n\t// ----------------------------- EVENTS -------------------------------//\n\t// --------------------------------------------------------------------//\n\n\t/**\n\t * Called by all event handlers that are based on user\n\t * input.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onUserInput( event ) {\n\n\t\tif( config.autoSlideStoppable ) {\n\t\t\tpauseAutoSlide();\n\t\t}\n\n\t}\n\n\t/**\n\t* Listener for post message events posted to this window.\n\t*/\n\tfunction onPostMessage( event ) {\n\n\t\tlet data = event.data;\n\n\t\t// Make sure we're dealing with JSON\n\t\tif( typeof data === 'string' && data.charAt( 0 ) === '{' && data.charAt( data.length - 1 ) === '}' ) {\n\t\t\tdata = JSON.parse( data );\n\n\t\t\t// Check if the requested method can be found\n\t\t\tif( data.method && typeof Reveal[data.method] === 'function' ) {\n\n\t\t\t\tif( POST_MESSAGE_METHOD_BLACKLIST.test( data.method ) === false ) {\n\n\t\t\t\t\tconst result = Reveal[data.method].apply( Reveal, data.args );\n\n\t\t\t\t\t// Dispatch a postMessage event with the returned value from\n\t\t\t\t\t// our method invocation for getter functions\n\t\t\t\t\tdispatchPostMessage( 'callback', { method: data.method, result: result } );\n\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tconsole.warn( 'reveal.js: \"'+ data.method +'\" is is blacklisted from the postMessage API' );\n\t\t\t\t}\n\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Event listener for transition end on the current slide.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onTransitionEnd( event ) {\n\n\t\tif( transition === 'running' && /section/gi.test( event.target.nodeName ) ) {\n\t\t\ttransition = 'idle';\n\t\t\tdispatchEvent({\n\t\t\t\ttype: 'slidetransitionend',\n\t\t\t\tdata: { indexh, indexv, previousSlide, currentSlide }\n\t\t\t});\n\t\t}\n\n\t}\n\n\t/**\n\t * A global listener for all click events inside of the\n\t * .slides container.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onSlidesClicked( event ) {\n\n\t\tconst anchor = Util.closest( event.target, 'a[href^=\"#\"]' );\n\n\t\t// If a hash link is clicked, we find the target slide\n\t\t// and navigate to it. We previously relied on 'hashchange'\n\t\t// for links like these but that prevented media with\n\t\t// audio tracks from playing in mobile browsers since it\n\t\t// wasn't considered a direct interaction with the document.\n\t\tif( anchor ) {\n\t\t\tconst hash = anchor.getAttribute( 'href' );\n\t\t\tconst indices = location.getIndicesFromHash( hash );\n\n\t\t\tif( indices ) {\n\t\t\t\tReveal.slide( indices.h, indices.v, indices.f );\n\t\t\t\tevent.preventDefault();\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the window level 'resize' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onWindowResize( event ) {\n\n\t\tlayout();\n\n\t}\n\n\t/**\n\t * Handle for the window level 'visibilitychange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onPageVisibilityChange( event ) {\n\n\t\t// If, after clicking a link or similar and we're coming back,\n\t\t// focus the document.body to ensure we can use keyboard shortcuts\n\t\tif( document.hidden === false && document.activeElement !== document.body ) {\n\t\t\t// Not all elements support .blur() - SVGs among them.\n\t\t\tif( typeof document.activeElement.blur === 'function' ) {\n\t\t\t\tdocument.activeElement.blur();\n\t\t\t}\n\t\t\tdocument.body.focus();\n\t\t}\n\n\t}\n\n\t/**\n\t * Handler for the document level 'fullscreenchange' event.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onFullscreenChange( event ) {\n\n\t\tlet element = document.fullscreenElement || document.webkitFullscreenElement;\n\t\tif( element === dom.wrapper ) {\n\t\t\tevent.stopImmediatePropagation();\n\n\t\t\t// Timeout to avoid layout shift in Safari\n\t\t\tsetTimeout( () => {\n\t\t\t\tReveal.layout();\n\t\t\t\tReveal.focus.focus(); // focus.focus :'(\n\t\t\t}, 1 );\n\t\t}\n\n\t}\n\n\t/**\n\t * Handles clicks on links that are set to preview in the\n\t * iframe overlay.\n\t *\n\t * @param {object} event\n\t */\n\tfunction onPreviewLinkClicked( event ) {\n\n\t\tif( event.currentTarget && event.currentTarget.hasAttribute( 'href' ) ) {\n\t\t\tlet url = event.currentTarget.getAttribute( 'href' );\n\t\t\tif( url ) {\n\t\t\t\tshowPreview( url );\n\t\t\t\tevent.preventDefault();\n\t\t\t}\n\t\t}\n\n\t}\n\n\t/**\n\t * Handles click on the auto-sliding controls element.\n\t *\n\t * @param {object} [event]\n\t */\n\tfunction onAutoSlidePlayerClick( event ) {\n\n\t\t// Replay\n\t\tif( isLastSlide() && config.loop === false ) {\n\t\t\tslide( 0, 0 );\n\t\t\tresumeAutoSlide();\n\t\t}\n\t\t// Resume\n\t\telse if( autoSlidePaused ) {\n\t\t\tresumeAutoSlide();\n\t\t}\n\t\t// Pause\n\t\telse {\n\t\t\tpauseAutoSlide();\n\t\t}\n\n\t}\n\n\n\t// --------------------------------------------------------------------//\n\t// ------------------------------- API --------------------------------//\n\t// --------------------------------------------------------------------//\n\n\t// The public reveal.js API\n\tconst API = {\n\t\tVERSION,\n\n\t\tinitialize,\n\t\tconfigure,\n\t\tdestroy,\n\n\t\tsync,\n\t\tsyncSlide,\n\t\tsyncFragments: fragments.sync.bind( fragments ),\n\n\t\t// Navigation methods\n\t\tslide,\n\t\tleft: navigateLeft,\n\t\tright: navigateRight,\n\t\tup: navigateUp,\n\t\tdown: navigateDown,\n\t\tprev: navigatePrev,\n\t\tnext: navigateNext,\n\n\t\t// Navigation aliases\n\t\tnavigateLeft, navigateRight, navigateUp, navigateDown, navigatePrev, navigateNext,\n\n\t\t// Fragment methods\n\t\tnavigateFragment: fragments.goto.bind( fragments ),\n\t\tprevFragment: fragments.prev.bind( fragments ),\n\t\tnextFragment: fragments.next.bind( fragments ),\n\n\t\t// Event binding\n\t\ton,\n\t\toff,\n\n\t\t// Legacy event binding methods left in for backwards compatibility\n\t\taddEventListener: on,\n\t\tremoveEventListener: off,\n\n\t\t// Forces an update in slide layout\n\t\tlayout,\n\n\t\t// Randomizes the order of slides\n\t\tshuffle,\n\n\t\t// Returns an object with the available routes as booleans (left/right/top/bottom)\n\t\tavailableRoutes,\n\n\t\t// Returns an object with the available fragments as booleans (prev/next)\n\t\tavailableFragments: fragments.availableRoutes.bind( fragments ),\n\n\t\t// Toggles a help overlay with keyboard shortcuts\n\t\ttoggleHelp,\n\n\t\t// Toggles the overview mode on/off\n\t\ttoggleOverview: overview.toggle.bind( overview ),\n\n\t\t// Toggles the \"black screen\" mode on/off\n\t\ttogglePause,\n\n\t\t// Toggles the auto slide mode on/off\n\t\ttoggleAutoSlide,\n\n\t\t// Slide navigation checks\n\t\tisFirstSlide,\n\t\tisLastSlide,\n\t\tisLastVerticalSlide,\n\t\tisVerticalSlide,\n\n\t\t// State checks\n\t\tisPaused,\n\t\tisAutoSliding,\n\t\tisSpeakerNotes: notes.isSpeakerNotesWindow.bind( notes ),\n\t\tisOverview: overview.isActive.bind( overview ),\n\t\tisFocused: focus.isFocused.bind( focus ),\n\t\tisPrintingPDF: print.isPrintingPDF.bind( print ),\n\n\t\t// Checks if reveal.js has been loaded and is ready for use\n\t\tisReady: () => ready,\n\n\t\t// Slide preloading\n\t\tloadSlide: slideContent.load.bind( slideContent ),\n\t\tunloadSlide: slideContent.unload.bind( slideContent ),\n\n\t\t// Preview management\n\t\tshowPreview,\n\t\thidePreview: closeOverlay,\n\n\t\t// Adds or removes all internal event listeners\n\t\taddEventListeners,\n\t\tremoveEventListeners,\n\t\tdispatchEvent,\n\n\t\t// Facility for persisting and restoring the presentation state\n\t\tgetState,\n\t\tsetState,\n\n\t\t// Presentation progress on range of 0-1\n\t\tgetProgress,\n\n\t\t// Returns the indices of the current, or specified, slide\n\t\tgetIndices,\n\n\t\t// Returns an Array of key:value maps of the attributes of each\n\t\t// slide in the deck\n\t\tgetSlidesAttributes,\n\n\t\t// Returns the number of slides that we have passed\n\t\tgetSlidePastCount,\n\n\t\t// Returns the total number of slides\n\t\tgetTotalSlides,\n\n\t\t// Returns the slide element at the specified index\n\t\tgetSlide,\n\n\t\t// Returns the previous slide element, may be null\n\t\tgetPreviousSlide: () => previousSlide,\n\n\t\t// Returns the current slide element\n\t\tgetCurrentSlide: () => currentSlide,\n\n\t\t// Returns the slide background element at the specified index\n\t\tgetSlideBackground,\n\n\t\t// Returns the speaker notes string for a slide, or null\n\t\tgetSlideNotes: notes.getSlideNotes.bind( notes ),\n\n\t\t// Returns an Array of all slides\n\t\tgetSlides,\n\n\t\t// Returns an array with all horizontal/vertical slides in the deck\n\t\tgetHorizontalSlides,\n\t\tgetVerticalSlides,\n\n\t\t// Checks if the presentation contains two or more horizontal\n\t\t// and vertical slides\n\t\thasHorizontalSlides,\n\t\thasVerticalSlides,\n\n\t\t// Checks if the deck has navigated on either axis at least once\n\t\thasNavigatedHorizontally: () => navigationHistory.hasNavigatedHorizontally,\n\t\thasNavigatedVertically: () => navigationHistory.hasNavigatedVertically,\n\n\t\t// Adds/removes a custom key binding\n\t\taddKeyBinding: keyboard.addKeyBinding.bind( keyboard ),\n\t\tremoveKeyBinding: keyboard.removeKeyBinding.bind( keyboard ),\n\n\t\t// Programmatically triggers a keyboard event\n\t\ttriggerKey: keyboard.triggerKey.bind( keyboard ),\n\n\t\t// Registers a new shortcut to include in the help overlay\n\t\tregisterKeyboardShortcut: keyboard.registerKeyboardShortcut.bind( keyboard ),\n\n\t\tgetComputedSlideSize,\n\n\t\t// Returns the current scale of the presentation content\n\t\tgetScale: () => scale,\n\n\t\t// Returns the current configuration object\n\t\tgetConfig: () => config,\n\n\t\t// Helper method, retrieves query string as a key:value map\n\t\tgetQueryHash: Util.getQueryHash,\n\n\t\t// Returns the path to the current slide as represented in the URL\n\t\tgetSlidePath: location.getHash.bind( location ),\n\n\t\t// Returns reveal.js DOM elements\n\t\tgetRevealElement: () => revealElement,\n\t\tgetSlidesElement: () => dom.slides,\n\t\tgetViewportElement: () => dom.viewport,\n\t\tgetBackgroundsElement: () => backgrounds.element,\n\n\t\t// API for registering and retrieving plugins\n\t\tregisterPlugin: plugins.registerPlugin.bind( plugins ),\n\t\thasPlugin: plugins.hasPlugin.bind( plugins ),\n\t\tgetPlugin: plugins.getPlugin.bind( plugins ),\n\t\tgetPlugins: plugins.getRegisteredPlugins.bind( plugins )\n\n\t};\n\n\t// Our internal API which controllers have access to\n\tUtil.extend( Reveal, {\n\t\t...API,\n\n\t\t// Methods for announcing content to screen readers\n\t\tannounceStatus,\n\t\tgetStatusText,\n\n\t\t// Controllers\n\t\tprint,\n\t\tfocus,\n\t\tprogress,\n\t\tcontrols,\n\t\tlocation,\n\t\toverview,\n\t\tfragments,\n\t\tslideContent,\n\t\tslideNumber,\n\n\t\tonUserInput,\n\t\tcloseOverlay,\n\t\tupdateSlidesVisibility,\n\t\tlayoutSlideContents,\n\t\ttransformSlides,\n\t\tcueAutoSlide,\n\t\tcancelAutoSlide\n\t} );\n\n\treturn API;\n\n};\n","import Deck, { VERSION } from './reveal.js'\n\n/**\n * Expose the Reveal class to the window. To create a\n * new instance:\n * let deck = new Reveal( document.querySelector( '.reveal' ), {\n *   controls: false\n * } );\n * deck.initialize().then(() => {\n *   // reveal.js is ready\n * });\n */\nlet Reveal = Deck;\n\n\n/**\n * The below is a thin shell that mimics the pre 4.0\n * reveal.js API and ensures backwards compatibility.\n * This API only allows for one Reveal instance per\n * page, whereas the new API above lets you run many\n * presentations on the same page.\n *\n * Reveal.initialize( { controls: false } ).then(() => {\n *   // reveal.js is ready\n * });\n */\n\nlet enqueuedAPICalls = [];\n\nReveal.initialize = options => {\n\n\t// Create our singleton reveal.js instance\n\tObject.assign( Reveal, new Deck( document.querySelector( '.reveal' ), options ) );\n\n\t// Invoke any enqueued API calls\n\tenqueuedAPICalls.map( method => method( Reveal ) );\n\n\treturn Reveal.initialize();\n\n}\n\n/**\n * The pre 4.0 API let you add event listener before\n * initializing. We maintain the same behavior by\n * queuing up premature API calls and invoking all\n * of them when Reveal.initialize is called.\n */\n[ 'configure', 'on', 'off', 'addEventListener', 'removeEventListener', 'registerPlugin' ].forEach( method => {\n\tReveal[method] = ( ...args ) => {\n\t\tenqueuedAPICalls.push( deck => deck[method].call( null, ...args ) );\n\t}\n} );\n\nReveal.isReady = () => false;\n\nReveal.VERSION = VERSION;\n\nexport default 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\ No newline at end of file
diff --git a/js/controllers/print.js b/js/controllers/print.js
index bad28df682b..4214519ff07 100644
--- a/js/controllers/print.js
+++ b/js/controllers/print.js
@@ -110,9 +110,7 @@ export default class Print {
 				slide.style.top = top + 'px';
 				slide.style.width = slideWidth + 'px';
 
-				// Re-run the slide layout so that r-fit-text is applied based on
-				// the printed slide size
-				this.Reveal.slideContent.layout( slide )
+				this.Reveal.slideContent.layout( slide );
 
 				if( slide.slideBackgroundElement ) {
 					page.insertBefore( slide.slideBackgroundElement, slide );
@@ -219,6 +217,9 @@ export default class Print {
 
 		pages.forEach( page => pageContainer.appendChild( page ) );
 
+		// Re-run JS-based content layout after the slide is added to page DOM
+		this.Reveal.slideContent.layout( this.Reveal.getSlidesElement() );
+
 		// Notify subscribers that the PDF layout is good to go
 		this.Reveal.dispatchEvent({ type: 'pdf-ready' });
 
diff --git a/js/controllers/slidecontent.js b/js/controllers/slidecontent.js
index d37dc243813..c26f3bd2c71 100644
--- a/js/controllers/slidecontent.js
+++ b/js/controllers/slidecontent.js
@@ -186,15 +186,14 @@ export default class SlideContent {
 	}
 
 	/**
-	 * Applies JS-dependent layout helpers for the given slide,
-	 * if there are any.
+	 * Applies JS-dependent layout helpers for the scope.
 	 */
-	layout( slide ) {
+	layout( scopeElement ) {
 
 		// Autosize text with the r-fit-text class based on the
 		// size of its container. This needs to happen after the
 		// slide is visible in order to measure the text.
-		Array.from( slide.querySelectorAll( '.r-fit-text' ) ).forEach( element => {
+		Array.from( scopeElement.querySelectorAll( '.r-fit-text' ) ).forEach( element => {
 			fitty( element, {
 				minSize: 24,
 				maxSize: this.Reveal.getConfig().height * 0.8,