So sánh hình ảnh trước/sau bằng HTML5

<html>
<head>
	<title>Image Comparison</title>
	<style type="text/css">
		div#comparison { 
			width: 60vw;
			height: 60vw;
			max-width: 600px;
			max-height: 600px;
			overflow: hidden;
			position: relative;
		}
		div#comparison figure { 
			background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/photoshop-face-before.jpg);
			background-size: cover;
			font-size: 0;
			width: 100%;
			height: 100%;
			margin: 0; 
		}
		div#comparison figure > img {
			position: relative;
			width: 100%;
		}
		div#comparison figure div { 
			background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/photoshop-face-after.jpg);
			background-size: cover;
			position: absolute;
			width: 50%; 
			box-shadow: 0 5px 10px -2px rgba(0,0,0,0.3);
			overflow: hidden;
			bottom: 0;
			height: 100%;
		}
		input[type=range]{
			-webkit-appearance:none;
			-moz-appearance:none;
			position: relative;
			top: -2rem; left: -2%;
			background-color: rgba(255,255,255,0.1);
			width: 102%; 
		}
		input[type=range]:focus { 
			outline: none;
		}
		input[type=range]:active {
			outline: none;
		}
		input[type=range]::-moz-range-track {
			-moz-appearance:none;
			height:15px;
			width: 98%;
			background-color: rgba(255,255,255,0.1); 
			position: relative;
			outline: none;    
		}
		input[type=range]::active {
			border: none;
			outline: none;
		}
		input[type=range]::-webkit-slider-thumb {
			-webkit-appearance:none;
			width: 20px;
			height: 15px;
			background: #fff;
			border-radius: 0;
		}
		input[type=range]::-moz-range-thumb {
			-moz-appearance: none;
			width: 20px;
			height: 15px;
			background: #fff;
			border-radius: 0;
		}   
		input[type=range]:focus::-webkit-slider-thumb {
			background: rgba(255,255,255,0.5);
		}
		input[type=range]:focus::-moz-range-thumb {
			background: rgba(255,255,255,0.5);
		}
	</style>
</head>
<body>
	<div id="comparison">
		<figure>
			<div id="divisor"></div>
		</figure>
		<input type="range" min="0" max="100" value="50" id="slider" oninput="moveDivisor()">
	</div>
	<script type="text/javascript">
		divisor = document.getElementById("divisor");
		slider = document.getElementById("slider");
		function moveDivisor() {
			divisor.style.width = slider.value+"%";
		}
		window.onload = function() {
			moveDivisor();
		};
	</script>
</body>
</html>

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So sánh hình ảnh trước/sau bằng HTML5