diff --git a/dist/lite-yt-embed.d.ts b/dist/lite-yt-embed.d.ts
index 67d7202..fdaa57d 100644
--- a/dist/lite-yt-embed.d.ts
+++ b/dist/lite-yt-embed.d.ts
@@ -39,6 +39,7 @@ declare class LiteYTEmbed extends HTMLElement {
     jpg: string;
     webp: string;
     api?: YT.Player;
+    private isInitialized?;
     private playLabelText;
     private posterEl?;
     private static checkWebpSupport;
diff --git a/dist/lite-yt-embed.js b/dist/lite-yt-embed.js
index 0815db0..4a00461 100644
--- a/dist/lite-yt-embed.js
+++ b/dist/lite-yt-embed.js
@@ -66,6 +66,12 @@ class LiteYTEmbed extends HTMLElement {
      * See: https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements
      */
     connectedCallback() {
+        // connectedCallback may be called once the element is no longer connected, use Node.isConnected to make sure
+        if (!this.isConnected)
+            return;
+        // make sure that the element is not being processed more than once
+        if (this.isInitialized === true)
+            return;
         // init global config object if it doesn't exist
         window.LiteYTEmbedConfig = window.LiteYTEmbedConfig ?? {};
         this.videoId = this.getAttribute('videoid') ?? '';
@@ -83,7 +89,7 @@ class LiteYTEmbed extends HTMLElement {
                 titleEl.className = 'lyt-title';
                 this.append(titleEl);
             }
-            if ((titleEl.textContent ?? '') !== '') {
+            if ((titleEl.textContent ?? '') === '') {
                 const titleTextEl = document.createElement('span');
                 titleTextEl.textContent = this.playLabelText;
                 titleEl.append(titleTextEl);
@@ -97,7 +103,7 @@ class LiteYTEmbed extends HTMLElement {
             playBtnEl.className = 'lyt-playbtn';
             this.append(playBtnEl);
         }
-        if ((playBtnEl.textContent ?? '') !== '') {
+        if ((playBtnEl.textContent ?? '') === '') {
             const playBtnLabelEl = document.createElement('span');
             playBtnLabelEl.className = 'lyt-visually-hidden';
             playBtnLabelEl.textContent = this.playLabelText;
@@ -122,6 +128,7 @@ class LiteYTEmbed extends HTMLElement {
                 window.LiteYTEmbedConfig.forceApi ??
                     (navigator.vendor.includes('Apple') || navigator.userAgent.includes('Mobi'));
         }
+        this.isInitialized = true;
     }
     /**
      * Tries to add iframe via DOM manipulations or YouTube API
@@ -164,19 +171,19 @@ class LiteYTEmbed extends HTMLElement {
     // Adds JPG (+ WebP) poster image
     addPoster() {
         // TODO: Add fallback for progressively enhanced videos as well
-        if (this.querySelector('.lyt-preview-container') != null) {
-            // Preview was added manually, don't override
+        if (this.querySelector('.lyt-poster-container') != null) {
+            // Poster was added manually, don't override
             return;
         }
         this.size = this.getAttribute('size') ?? window.LiteYTEmbedConfig?.size ?? 'hq';
-        // validate preview size
+        // validate poster size
         if (!['mq', 'hq', 'sd', 'maxres'].includes(this.size))
             return;
-        // Custom jpg preview
+        // Custom jpg poster
         this.jpg = this.getAttribute('jpg') ?? '';
         /**
          * 'yes' - default YouTube image
-         * 'no' - typically used if YouTube has no preview for this video
+         * 'no' - typically used if YouTube has no poster for this video
          * Anything else is treated like a custom image
          */
         this.webp = this.getAttribute('webp') ?? window.LiteYTEmbedConfig?.webp ?? 'yes';
diff --git a/dist/lite-yt-embed.min.js b/dist/lite-yt-embed.min.js
index c62c57e..ae287c7 100644
--- a/dist/lite-yt-embed.min.js
+++ b/dist/lite-yt-embed.min.js
@@ -1,2 +1,2 @@
-"use strict";class LiteYTEmbed extends HTMLElement{constructor(){super(...arguments),this.videoId="",this.playlistId="",this.size="",this.jpg="",this.webp="",this.t=""}static i(){var t=document.createElement("canvas");return null!=t.getContext?.("2d")&&0===t.toDataURL("image/webp").indexOf("data:image/webp")}static h(){LiteYTEmbed.o||(LiteYTEmbed.l("preconnect","https://www.youtube-nocookie.com"),LiteYTEmbed.l("preconnect","https://www.google.com"),LiteYTEmbed.l("preconnect","https://googleads.g.doubleclick.net"),LiteYTEmbed.l("preconnect","https://static.doubleclick.net"),LiteYTEmbed.o=!0)}static l(t,i){var e=document.createElement("link");e.rel=t,e.href=i,document.head.append(e)}connectedCallback(){window.LiteYTEmbedConfig=window.LiteYTEmbedConfig??{},this.videoId=this.getAttribute("videoid")??"",this.playlistId=this.getAttribute("playlistid")??"";let t=this.querySelector(".lyt-playbtn");var i;if(this.t=t?.textContent?.trim()??this.getAttribute("playlabel")??window.LiteYTEmbedConfig.playLabel??"Play","yes"===(this.getAttribute("showtitle")??window.LiteYTEmbedConfig.showTitle??"no")){let t=this.querySelector(".lyt-title");null==t&&((t=document.createElement("div")).className="lyt-title",this.append(t)),""!==(t.textContent??"")&&((i=document.createElement("span")).textContent=this.t,t.append(i))}this.m(),null==t&&((t=document.createElement("button")).type="button",t.className="lyt-playbtn",this.append(t)),""!==(t.textContent??"")&&((i=document.createElement("span")).className="lyt-visually-hidden",i.textContent=this.t,t.append(i)),t.removeAttribute("href"),t.removeAttribute("target"),this.addEventListener("pointerover",LiteYTEmbed.h,{once:!0}),this.addEventListener("click",this.addIframe),void 0===LiteYTEmbed.p&&(LiteYTEmbed.p=window.LiteYTEmbedConfig.forceApi??(navigator.vendor.includes("Apple")||navigator.userAgent.includes("Mobi")))}addIframe(){var t,i;this.classList.contains("lyt-activated")||(this.classList.add("lyt-activated"),(t=new URLSearchParams(this.getAttribute("params")??window.LiteYTEmbedConfig?.params??"")).append("autoplay","1"),t.append("playsinline","1"),""!==window.location.host&&t.append("origin",window.location.origin),!0===LiteYTEmbed.p?this.u(t):((i=document.createElement("iframe")).width="560",i.height="315",i.title=this.t,i.allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture",i.allowFullscreen=!0,i.fetchPriority="high",""!==this.playlistId?i.src=`https://www.youtube-nocookie.com/embed/videoseries?list=${this.playlistId}&`+t.toString():i.src=`https://www.youtube-nocookie.com/embed/${this.videoId}?`+t.toString(),this.append(i),i.focus(),this.dispatchEvent(new CustomEvent("ready"))))}m(){var t,i;null==this.querySelector(".lyt-preview-container")&&(this.size=this.getAttribute("size")??window.LiteYTEmbedConfig?.size??"hq",["mq","hq","sd","maxres"].includes(this.size))&&(this.jpg=this.getAttribute("jpg")??"",this.webp=this.getAttribute("webp")??window.LiteYTEmbedConfig?.webp??"yes",void 0===LiteYTEmbed.v&&(LiteYTEmbed.v=LiteYTEmbed.i()),LiteYTEmbed.v||(this.webp="no"),(t=document.createElement("picture")).className="lyt-poster-container","no"!==this.webp&&((i=document.createElement("source")).setAttribute("type","image/webp"),i.setAttribute("srcset","yes"===this.webp?`https://i.ytimg.com/vi_webp/${this.videoId}/${this.size}default.webp`:this.webp),t.appendChild(i)),this.g=document.createElement("img"),this.g.setAttribute("decoding","async"),this.g.setAttribute("loading","lazy"),this.T(),this.g.setAttribute("src",""!==this.jpg?this.jpg:`https://i.ytimg.com/vi/${this.videoId}/${this.size}default.jpg`),this.g.setAttribute("alt",this.t),this.g.setAttribute("title",this.t),this.g.className="lyt-poster",!0===window.LiteYTEmbedConfig?.useFallback&&(this.classList.add("lyt-poster-hidden"),this.L=this.L.bind(this),this.Y=this.Y.bind(this),this.g.complete&&this.L(),this.g.addEventListener("load",this.L),this.g.addEventListener("error",this.Y)),t.appendChild(this.g),this.insertBefore(t,this.firstChild))}T(){let t,i;switch(this.size){case"mq":t=320,i=180;break;case"hq":t=480,i=360;break;case"sd":t=640,i=480;break;default:t=1280,i=720}this.g?.setAttribute("width",t.toString()),this.g?.setAttribute("height",i.toString())}$(){switch(this.size){case"maxres":return this.size="sd",!0;case"sd":return this.size="hq",!0}return!1}L(){(this.g?.naturalWidth??0)<=120?this.Y():this.classList.remove("lyt-poster-hidden")}Y(){var t=this.querySelector("source");if(null!=t)return"yes"!==this.webp?(this.webp="yes",void t.setAttribute("srcset",`https://i.ytimg.com/vi_webp/${this.videoId}/${this.size}default.webp`)):this.$()?(this.T(),void t.setAttribute("srcset",`https://i.ytimg.com/vi_webp/${this.videoId}/${this.size}default.webp`)):(t.remove(),this.webp="no",void this.g?.setAttribute("src",`https://i.ytimg.com/vi/${this.videoId}/${this.size}default.jpg`));""!==this.jpg?(this.jpg="",this.g?.setAttribute("src",`https://i.ytimg.com/vi/${this.videoId}/${this.size}default.jpg`)):this.$()&&(this.T(),this.g?.setAttribute("src",`https://i.ytimg.com/vi/${this.videoId}/${this.size}default.jpg`))}async u(t){await this.k();var i=document.createElement("div"),e=(this.append(i),{width:"100%",host:"https://www.youtube-nocookie.com",events:{onReady:t=>{this.api=t.target,this.api.playVideo(),this.dispatchEvent(new CustomEvent("ready"))}}});""!==this.playlistId?(t.append("listType","playlist"),t.append("list",this.playlistId)):e.videoId=this.videoId,e.playerVars=Object.fromEntries(t.entries()),new YT.Player(i,e)}k(){if(void 0===window.YT)return new Promise((t,i)=>{var e=document.createElement("script");e.src="https://www.youtube.com/iframe_api",e.async=!0,e.onload=()=>{window.YT?.ready(t)},e.onerror=i,this.append(e)})}}LiteYTEmbed.o=!1,customElements.define("lite-youtube",LiteYTEmbed);
+"use strict";class LiteYTEmbed extends HTMLElement{constructor(){super(...arguments),this.videoId="",this.playlistId="",this.size="",this.jpg="",this.webp="",this.t=""}static i(){var t=document.createElement("canvas");return null!=t.getContext?.("2d")&&0===t.toDataURL("image/webp").indexOf("data:image/webp")}static h(){LiteYTEmbed.o||(LiteYTEmbed.l("preconnect","https://www.youtube-nocookie.com"),LiteYTEmbed.l("preconnect","https://www.google.com"),LiteYTEmbed.l("preconnect","https://googleads.g.doubleclick.net"),LiteYTEmbed.l("preconnect","https://static.doubleclick.net"),LiteYTEmbed.o=!0)}static l(t,i){var s=document.createElement("link");s.rel=t,s.href=i,document.head.append(s)}connectedCallback(){if(this.isConnected&&!0!==this.m){window.LiteYTEmbedConfig=window.LiteYTEmbedConfig??{},this.videoId=this.getAttribute("videoid")??"",this.playlistId=this.getAttribute("playlistid")??"";let t=this.querySelector(".lyt-playbtn");var i;if(this.t=t?.textContent?.trim()??this.getAttribute("playlabel")??window.LiteYTEmbedConfig.playLabel??"Play","yes"===(this.getAttribute("showtitle")??window.LiteYTEmbedConfig.showTitle??"no")){let t=this.querySelector(".lyt-title");null==t&&((t=document.createElement("div")).className="lyt-title",this.append(t)),""===(t.textContent??"")&&((i=document.createElement("span")).textContent=this.t,t.append(i))}this.p(),null==t&&((t=document.createElement("button")).type="button",t.className="lyt-playbtn",this.append(t)),""===(t.textContent??"")&&((i=document.createElement("span")).className="lyt-visually-hidden",i.textContent=this.t,t.append(i)),t.removeAttribute("href"),t.removeAttribute("target"),this.addEventListener("pointerover",LiteYTEmbed.h,{once:!0}),this.addEventListener("click",this.addIframe),void 0===LiteYTEmbed.u&&(LiteYTEmbed.u=window.LiteYTEmbedConfig.forceApi??(navigator.vendor.includes("Apple")||navigator.userAgent.includes("Mobi"))),this.m=!0}}addIframe(){var t,i;this.classList.contains("lyt-activated")||(this.classList.add("lyt-activated"),(t=new URLSearchParams(this.getAttribute("params")??window.LiteYTEmbedConfig?.params??"")).append("autoplay","1"),t.append("playsinline","1"),""!==window.location.host&&t.append("origin",window.location.origin),!0===LiteYTEmbed.u?this.v(t):((i=document.createElement("iframe")).width="560",i.height="315",i.title=this.t,i.allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture",i.allowFullscreen=!0,i.fetchPriority="high",""!==this.playlistId?i.src=`https://www.youtube-nocookie.com/embed/videoseries?list=${this.playlistId}&`+t.toString():i.src=`https://www.youtube-nocookie.com/embed/${this.videoId}?`+t.toString(),this.append(i),i.focus(),this.dispatchEvent(new CustomEvent("ready"))))}p(){var t,i;null==this.querySelector(".lyt-poster-container")&&(this.size=this.getAttribute("size")??window.LiteYTEmbedConfig?.size??"hq",["mq","hq","sd","maxres"].includes(this.size))&&(this.jpg=this.getAttribute("jpg")??"",this.webp=this.getAttribute("webp")??window.LiteYTEmbedConfig?.webp??"yes",void 0===LiteYTEmbed.g&&(LiteYTEmbed.g=LiteYTEmbed.i()),LiteYTEmbed.g||(this.webp="no"),(t=document.createElement("picture")).className="lyt-poster-container","no"!==this.webp&&((i=document.createElement("source")).setAttribute("type","image/webp"),i.setAttribute("srcset","yes"===this.webp?`https://i.ytimg.com/vi_webp/${this.videoId}/${this.size}default.webp`:this.webp),t.appendChild(i)),this.T=document.createElement("img"),this.T.setAttribute("decoding","async"),this.T.setAttribute("loading","lazy"),this.L(),this.T.setAttribute("src",""!==this.jpg?this.jpg:`https://i.ytimg.com/vi/${this.videoId}/${this.size}default.jpg`),this.T.setAttribute("alt",this.t),this.T.setAttribute("title",this.t),this.T.className="lyt-poster",!0===window.LiteYTEmbedConfig?.useFallback&&(this.classList.add("lyt-poster-hidden"),this.Y=this.Y.bind(this),this.$=this.$.bind(this),this.T.complete&&this.Y(),this.T.addEventListener("load",this.Y),this.T.addEventListener("error",this.$)),t.appendChild(this.T),this.insertBefore(t,this.firstChild))}L(){let t,i;switch(this.size){case"mq":t=320,i=180;break;case"hq":t=480,i=360;break;case"sd":t=640,i=480;break;default:t=1280,i=720}this.T?.setAttribute("width",t.toString()),this.T?.setAttribute("height",i.toString())}k(){switch(this.size){case"maxres":return this.size="sd",!0;case"sd":return this.size="hq",!0}return!1}Y(){(this.T?.naturalWidth??0)<=120?this.$():this.classList.remove("lyt-poster-hidden")}$(){var t=this.querySelector("source");if(null!=t)return"yes"!==this.webp?(this.webp="yes",void t.setAttribute("srcset",`https://i.ytimg.com/vi_webp/${this.videoId}/${this.size}default.webp`)):this.k()?(this.L(),void t.setAttribute("srcset",`https://i.ytimg.com/vi_webp/${this.videoId}/${this.size}default.webp`)):(t.remove(),this.webp="no",void this.T?.setAttribute("src",`https://i.ytimg.com/vi/${this.videoId}/${this.size}default.jpg`));""!==this.jpg?(this.jpg="",this.T?.setAttribute("src",`https://i.ytimg.com/vi/${this.videoId}/${this.size}default.jpg`)):this.k()&&(this.L(),this.T?.setAttribute("src",`https://i.ytimg.com/vi/${this.videoId}/${this.size}default.jpg`))}async v(t){await this.P();var i=document.createElement("div"),s=(this.append(i),{width:"100%",host:"https://www.youtube-nocookie.com",events:{onReady:t=>{this.api=t.target,this.api.playVideo(),this.dispatchEvent(new CustomEvent("ready"))}}});""!==this.playlistId?(t.append("listType","playlist"),t.append("list",this.playlistId)):s.videoId=this.videoId,s.playerVars=Object.fromEntries(t.entries()),new YT.Player(i,s)}P(){if(void 0===window.YT)return new Promise((t,i)=>{var s=document.createElement("script");s.src="https://www.youtube.com/iframe_api",s.async=!0,s.onload=()=>{window.YT?.ready(t)},s.onerror=i,this.append(s)})}}LiteYTEmbed.o=!1,customElements.define("lite-youtube",LiteYTEmbed);
 //# sourceMappingURL=lite-yt-embed.min.js.map
\ No newline at end of file
diff --git a/dist/lite-yt-embed.min.js.map b/dist/lite-yt-embed.min.js.map
index 0f731e7..5281ba5 100644
--- a/dist/lite-yt-embed.min.js.map
+++ b/dist/lite-yt-embed.min.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/scripts/process-js.mjs b/scripts/process-js.mjs
index b063732..c37653d 100644
--- a/scripts/process-js.mjs
+++ b/scripts/process-js.mjs
@@ -32,6 +32,7 @@ for (const path of files) {
     // private properties
     'playLabelText',
     'posterEl',
+    'isInitialized',
   ];
   const manglePropsRegExp = new RegExp(`^(${mangleProps.join('|')})$`);
 
diff --git a/src/lite-yt-embed.ts b/src/lite-yt-embed.ts
index fb321d2..b385558 100644
--- a/src/lite-yt-embed.ts
+++ b/src/lite-yt-embed.ts
@@ -48,6 +48,7 @@ class LiteYTEmbed extends HTMLElement {
   public webp: string = '';
   // API Player for this video
   public api?: YT.Player;
+  private isInitialized?: boolean;
   private playLabelText: string = '';
   // Poster img element
   private posterEl?: HTMLImageElement;
@@ -101,6 +102,12 @@ class LiteYTEmbed extends HTMLElement {
    * See: https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements
    */
   connectedCallback(): void {
+    // connectedCallback may be called once the element is no longer connected, use Node.isConnected to make sure
+    if (!this.isConnected) return;
+
+    // make sure that the element is not being processed more than once
+    if(this.isInitialized === true) return;
+
     // init global config object if it doesn't exist
     window.LiteYTEmbedConfig = window.LiteYTEmbedConfig ?? {};
 
@@ -165,6 +172,8 @@ class LiteYTEmbed extends HTMLElement {
         window.LiteYTEmbedConfig.forceApi ??
         (navigator.vendor.includes('Apple') || navigator.userAgent.includes('Mobi'));
     }
+
+    this.isInitialized = true;
   }
 
   /**
@@ -214,21 +223,21 @@ class LiteYTEmbed extends HTMLElement {
   private addPoster(): void {
     // TODO: Add fallback for progressively enhanced videos as well
 
-    if (this.querySelector('.lyt-preview-container') != null) {
-      // Preview was added manually, don't override
+    if (this.querySelector('.lyt-poster-container') != null) {
+      // Poster was added manually, don't override
       return;
     }
 
     this.size = this.getAttribute('size') ?? window.LiteYTEmbedConfig?.size ?? 'hq';
-    // validate preview size
+    // validate poster size
     if (!['mq', 'hq', 'sd', 'maxres'].includes(this.size)) return;
 
-    // Custom jpg preview
+    // Custom jpg poster
     this.jpg = this.getAttribute('jpg') ?? '';
 
     /**
      * 'yes' - default YouTube image
-     * 'no' - typically used if YouTube has no preview for this video
+     * 'no' - typically used if YouTube has no poster for this video
      * Anything else is treated like a custom image
      */
     this.webp = this.getAttribute('webp') ?? window.LiteYTEmbedConfig?.webp ?? 'yes';
diff --git a/tests/no-children-duplication.html b/tests/no-children-duplication.html
new file mode 100644
index 0000000..6b14e32
--- /dev/null
+++ b/tests/no-children-duplication.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <title>lite-youtube-embed - No children duplication when moving element</title>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <link rel="stylesheet" href="../dist/lite-yt-embed.min.css" />
+</head>
+<body>
+<h1>No children duplication when moving element</h1>
+
+<p>
+    <button id="move">Re-append</button>
+</p>
+
+<p>
+    Child node count: <span id="children"></span>
+</p>
+
+<p id="video">
+    <lite-youtube videoid="ogfYd705cRs" playlabel="Keynote (Google I/O '18)"></lite-youtube>
+</p>
+
+<script src="../dist/lite-yt-embed.min.js"></script>
+<script>
+    const videoEl = document.querySelector('#video');
+    const liteEl = document.querySelector('lite-youtube');
+    const moveBtn = document.querySelector('#move');
+    const children = document.querySelector('#children');
+
+    children.textContent = liteEl.childNodes.length;
+
+    moveBtn.addEventListener('click', () => {
+        videoEl.appendChild(liteEl);
+        children.textContent = liteEl.childNodes.length;
+    });
+</script>
+
+</body>
+</html>