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Browsers.html
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<title>Browsers</title>
<!-- 2014-08-29 Fri 00:22 -->
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<body>
<div id="content">
<h1 class="title">Browsers</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#sec-1">1. What is a <b>Web Browser?</b></a>
<ul>
<li><a href="#sec-1-1">1.1. Many things</a></li>
</ul>
</li>
<li><a href="#sec-2">2. What is the core?</a>
<ul>
<li><a href="#sec-2-1">2.1. Symmetric usage</a></li>
</ul>
</li>
<li><a href="#sec-3">3. Features</a>
<ul>
<li><a href="#sec-3-1">3.1. Examples</a></li>
</ul>
</li>
<li><a href="#sec-4">4. Address Bar -> Web Page</a>
<ul>
<li><a href="#sec-4-1">4.1. Definitions</a></li>
</ul>
</li>
<li><a href="#sec-5">5. What is a Browser?</a></li>
<li><a href="#sec-6">6. Why Separate the Browser from Websites?</a>
<ul>
<li><a href="#sec-6-1">6.1. Flexibility</a></li>
</ul>
</li>
<li><a href="#sec-7">7. Browser or Web Page?</a></li>
<li><a href="#sec-8">8. Browsers, Apps, Operating Systems</a></li>
<li><a href="#sec-9">9. Market Share</a>
<ul>
<li><a href="#sec-9-1">9.1. Numbers</a></li>
</ul>
</li>
<li><a href="#sec-10">10. Utilities</a></li>
<li><a href="#sec-11">11. Questions</a></li>
<li><a href="#sec-12">12. Browsing Information Not a New Idea</a></li>
<li><a href="#sec-13">13. World Brain</a></li>
<li><a href="#sec-14">14. <b>Homework</b></a></li>
</ul>
</div>
</div>
<div id="outline-container-sec-1" class="outline-2">
<h2 id="sec-1"><span class="section-number-2">1</span> What is a <b>Web Browser?</b>   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-1">
</div><div id="outline-container-sec-1-1" class="outline-3">
<h3 id="sec-1-1"><span class="section-number-3">1.1</span> Many things   <span class="tag"><span class="notes">notes</span></span></h3>
<div class="outline-text-3" id="text-1-1">
<ul class="org-ul">
<li>"Thing I type Google into"
</li>
<li>Loads data from the Internet
</li>
<li>Displays it
</li>
<li>Runs Javascript
</li>
<li>has plugins
</li>
</ul>
</div>
</div>
</div>
<div id="outline-container-sec-2" class="outline-2">
<h2 id="sec-2"><span class="section-number-2">2</span> What is the core?   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-2">
<div class="figure">
<p><img src="img/www-gnu.png" alt="www-gnu.png"/></p>
</div>
<ul class="org-ul">
<li><a href="http://en.wikipedia.org/wiki/WorldWideWeb">WorldWideWeb</a> (confusingly named) the first browser
</li>
<li>Tim Breners-Lee wrote it to share data with colleagues at CERN
</li>
<li>Display HTML with Style Sheets from remote servers
</li>
<li>Editing was built into the first version
</li>
<li>Support different Protocols: FTP, HTTP, NNTP, local files
</li>
</ul>
</div>
<div id="outline-container-sec-2-1" class="outline-3">
<h3 id="sec-2-1"><span class="section-number-3">2.1</span> Symmetric usage   <span class="tag"><span class="notes">notes</span></span></h3>
<div class="outline-text-3" id="text-2-1">
<ul class="org-ul">
<li>Belief was that one would be creating as much as consuming information
</li>
<li>Plus, can't build a browser if there's nothing to browse!
</li>
<li>Already supported protocols for transferring files, reading newsgroups
</li>
<li>Images originally displayed in a separate window. Eventually inlined.
</li>
</ul>
</div>
</div>
</div>
<div id="outline-container-sec-3" class="outline-2">
<h2 id="sec-3"><span class="section-number-2">3</span> Features   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-3">
<ul class="org-ul">
<li>Network access
</li>
<li>Interpreting the fetched data
<ul class="org-ul">
<li>Possibly fetching and interpreting dependencies like images
</li>
</ul>
</li>
<li>Rendering HTML with CSS rules
</li>
<li>Running scripts in the context of the web page
</li>
<li>Utility functions
</li>
</ul>
</div>
<div id="outline-container-sec-3-1" class="outline-3">
<h3 id="sec-3-1"><span class="section-number-3">3.1</span> Examples   <span class="tag"><span class="notes">notes</span></span></h3>
<div class="outline-text-3" id="text-3-1">
<dl class="org-dl">
<dt> Network access </dt><dd>HTTP
</dd>
<dt> Fetched Data </dt><dd>HTML, CSS
</dd>
<dt> Rendering </dt><dd>Displaying a table with row and column lines
</dd>
<dt> Scripts </dt><dd>Validating a password before submitting
</dd>
<dt> Utility functions </dt><dd>tabs, bookmarks, plugins
</dd>
</dl>
</div>
</div>
</div>
<div id="outline-container-sec-4" class="outline-2">
<h2 id="sec-4"><span class="section-number-2">4</span> Address Bar -> Web Page   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-4">
<ol class="org-ol">
<li>Analyze address bar to determine protocol and server
</li>
<li>Connect to server, download data and all dependencies
</li>
<li>Analyze HTML, generate a Document Object Model (DOM)
</li>
<li>Apply CSS to the DOM
</li>
<li>Display the DOM
</li>
<li>Start executing scripting code and re-render the DOM as required
</li>
<li>Continue executing and interpreting user actions
</li>
</ol>
</div>
<div id="outline-container-sec-4-1" class="outline-3">
<h3 id="sec-4-1"><span class="section-number-3">4.1</span> Definitions   <span class="tag"><span class="notes">notes</span></span></h3>
<div class="outline-text-3" id="text-4-1">
<dl class="org-dl">
<dt> DOM </dt><dd>A way of representing the HTML so that it can be analyzed and
modified
</dd>
<dt> scripting </dt><dd>programming language designed to work with web pages, eg.
Javascript
</dd>
<dt> Recursive </dt><dd>Each of these steps have at many steps underneath them
</dd>
</dl>
</div>
</div>
</div>
<div id="outline-container-sec-5" class="outline-2">
<h2 id="sec-5"><span class="section-number-2">5</span> What is a Browser?   <span class="tag"><span class="slide">slide</span> <span class="center">center</span></span></h2>
<div class="outline-text-2" id="text-5">
<iframe width="560" height="315" src="http://www.youtube.com/embed/o4MwTvtyrUQ" frameborder="0" allowfullscreen></iframe>
</div>
</div>
<div id="outline-container-sec-6" class="outline-2">
<h2 id="sec-6"><span class="section-number-2">6</span> Why Separate the Browser from Websites?   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-6">
<ul class="org-ul">
<li>Composability!
</li>
<li>Improve the features around the website without upgrading the website
<ul class="org-ul">
<li>Original browser did not have Forward Back buttons
</li>
</ul>
</li>
<li>Accessibility
<ul class="org-ul">
<li>Tradeoff is the layouts need to follow rules, designers must design with
multiple audiences in mind
</li>
</ul>
</li>
</ul>
</div>
<div id="outline-container-sec-6-1" class="outline-3">
<h3 id="sec-6-1"><span class="section-number-3">6.1</span> Flexibility   <span class="tag"><span class="notes">notes</span></span></h3>
<div class="outline-text-3" id="text-6-1">
<ul class="org-ul">
<li>Separating the content from the presentation allows you more flexibility with how you want to use it
</li>
<li>What if you could only view websites like a TV image. No cut+paste, viewing on mobile vs. desktop
</li>
</ul>
</div>
</div>
</div>
<div id="outline-container-sec-7" class="outline-2">
<h2 id="sec-7"><span class="section-number-2">7</span> Browser or Web Page?   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-7">
<ul class="org-ul">
<li><img src="img/ie8-logo.png" alt="ie8-logo.png"/> Internet Explorer
</li>
<li>
<div class="figure">
<p><img src="img/Google_logo.png" alt="Google_logo.png"/></p>
</div>
</li>
<li>
<div class="figure">
<p><img src="img/nyt-logo.png" alt="nyt-logo.png"/></p>
</div>
</li>
<li>Firefox <img src="img/firefox-logo.png" alt="firefox-logo.png"/>
</li>
<li>Others?
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-8" class="outline-2">
<h2 id="sec-8"><span class="section-number-2">8</span> Browsers, Apps, Operating Systems   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-8">
<ul class="org-ul">
<li>Traditionally, browsers were applications running in an OS like Windows
</li>
<li>Scripting enables browsers to run their own code
</li>
<li>Complex web pages (eg. Gmail) behave almost like an application
</li>
<li>Browsers could become an OS themselves, ala ChromeOS
</li>
<li>Some Apps now written entirely in Javascript
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-9" class="outline-2">
<h2 id="sec-9"><span class="section-number-2">9</span> Market Share   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-9">
<div class="figure">
<p><img src="img/desktopbrowserapril.jpg" alt="desktopbrowserapril.jpg"/></p>
</div>
</div>
<div id="outline-container-sec-9-1" class="outline-3">
<h3 id="sec-9-1"><span class="section-number-3">9.1</span> Numbers   <span class="tag"><span class="notes">notes</span></span></h3>
<div class="outline-text-3" id="text-9-1">
<ul class="org-ul">
<li>Significant sampling bias
</li>
<li>Eg. wikimedia sees 46% Chrome, 11% IE
</li>
</ul>
</div>
</div>
</div>
<div id="outline-container-sec-10" class="outline-2">
<h2 id="sec-10"><span class="section-number-2">10</span> Utilities   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-10">
<ul class="org-ul">
<li><i>Firefly</i> for Firefox, <i>Developer Tools</i> for Chrome
</li>
<li>Enable you to modify the page as you're viewing it
</li>
<li>Valuable for understanding how HTML and CSS are rendered
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-11" class="outline-2">
<h2 id="sec-11"><span class="section-number-2">11</span> Questions   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-11">
<ul class="org-ul">
<li>What is CSS used for?
</li>
<li>What are some of the utilities you use in your browser?
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-12" class="outline-2">
<h2 id="sec-12"><span class="section-number-2">12</span> Browsing Information Not a New Idea   <span class="tag"><span class="slide">slide</span> <span class="center">center</span></span></h2>
<div class="outline-text-2" id="text-12">
<iframe width="420" height="315" src="http://www.youtube.com/embed/hSyfZkVgasI" frameborder="0" allowfullscreen></iframe>
<p>
Paul Otlet
</p>
</div>
</div>
<div id="outline-container-sec-13" class="outline-2">
<h2 id="sec-13"><span class="section-number-2">13</span> World Brain   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-13">
<ul class="org-ul">
<li>Proposals for Encyclopaedia from H.G. Wells 1937
</li>
<li>Engelbart developed oN-Line System (NLS) that used HyperText 1960s
</li>
<li>"Notecards" at Xerox PARC 1984
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-14" class="outline-2">
<h2 id="sec-14"><span class="section-number-2">14</span> <b>Homework</b>   <span class="tag"><span class="slide">slide</span></span></h2>
<div class="outline-text-2" id="text-14">
<ul class="org-ul">
<li>Learn <b>git</b> for future homework submissions
</li>
<li>practice sending a homework
</li>
<li>reading
</li>
</ul>
<script type="text/javascript" src="production/org-html-slideshow.js"></script>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: Jim Blomo</p>
<p class="date">Created: 2014-08-29 Fri 00:22</p>
<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 23.4.1 (<a href="http://orgmode.org">Org</a> mode 8.0.6)</p>
<p class="xhtml-validation"><a href="http://validator.w3.org/check?uri=referer">Validate XHTML 1.0</a></p>
</div>
</body>
</html>