JSFiddle - React, Tailwind, and code Playground

by Nexi

HTML

<div class="wrapper">
  <p>I want this video to start automatically on page load on a desktop and on a mobile phone I want it to stay as lazyload like in this demo.</p>
	<div class="youtube" data-embed="4ckxTlaDJ7E">
		<div class="play-button"></div>
	</div>
  <p>But I want the other YT Lazy Load YOUTUBE Videos to stay as Lazy Load until I click the Play Button.</p>
  	<div class="youtube" data-embed="XBtPebpfVg4">
		<div class="play-button"></div>
	</div>
</div>

CSS

html {
	background-color: #f3f3f3;
  font-family: sans-serif;
}
.wrapper {
	max-width: 680px;
	margin: 60px 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%;
	-webkit-transform: translate3d( -50%, -50%, 0 );
	        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 );
				} );	
	};
	
} )();