Embed “Lazy Load” YouTube Videos

HTML
<div class="wrapper"> <div class="youtube" data-embed="BPNTC7uZYrI"> <div class="play-button"></div> </div> </div>
CSS
html { background-color: #34435E; } .wrapper { max-width: 680px; margin: 80px auto; padding: 0 20px; } .youtube { background-color: #000; margin-bottom: 30px; position: relative; padding-top: 56.25%; overflow: hidden; cursor: pointer; } .youtube img { width: 100%; top: -16.82%; left: 0; opacity: 0.7; } .youtube .play-button { width: 90px; height: 60px; background-color: #333; box-shadow: 0 0 30px rgba( 0,0,0,0.6 ); z-index: 1; opacity: 0.8; border-radius: 6px; } .youtube .play-button:before { content: ""; border-style: solid; border-width: 15px 0 15px 26.0px; border-color: transparent transparent transparent #fff; } .youtube img, .youtube .play-button { cursor: pointer; } .youtube img, .youtube iframe, .youtube .play-button, .youtube .play-button:before { position: absolute; } .youtube .play-button, .youtube .play-button:before { top: 50%; left: 50%; transform: translate3d( -50%, -50%, 0 ); } .youtube iframe { height: 100%; width: 100%; top: 0; left: 0; }
JAVASCRIPT
( function() { var youtube = document.querySelectorAll( ".youtube" ); for (var i = 0; i < youtube.length; i++) { var source = "https://img.youtube.com/vi/"+ youtube[i].dataset.embed +"/sddefault.jpg"; var image = new Image(); image.src = source; image.addEventListener( "load", function() { youtube[ i ].appendChild( image ); }( i ) ); youtube[i].addEventListener( "click", function() { var iframe = document.createElement( "iframe" ); iframe.setAttribute( "frameborder", "0" ); iframe.setAttribute( "allowfullscreen", "" ); iframe.setAttribute( "src", "https://www.youtube.com/embed/"+ this.dataset.embed +"?rel=0&showinfo=0&autoplay=1" ); this.innerHTML = ""; this.appendChild( iframe ); } ); }; } )();
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