HTML5 slider so sánh hình ảnh trước và sau

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HTML:


<div id="comparison">
<figure>
<div id="divisor"></div>
</figure>
<input type="range" min="0" max="100" value="50" id="slider" oninput="moveDivisor()">
</div>



CSS:

div#comparison {
width: 60vw;
height: 60vw;
max-width: 600px;
max-height: 600px;
overflow: hidden; }
div#comparison figure {
background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/photoshop-face-before.jpg);
background-size: cover;
position: relative;
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);
}



JS:

var divisor = document.getElementById("divisor"),
slider = document.getElementById("slider");
function moveDivisor() {
divisor.style.width = slider.value+"%";
}
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