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mix-blend-mode-sibling-with-3D-transform-and-transition.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Test: blending between an element and its sibling having 3D transform and transition</title>
<link rel="author" title="Mirela Budăeș" href="mailto:mbudaes@adobe.com">
<link rel="author" title="Ion Roșca" href="mailto:rosca@adobe.com">
<link rel="reviewer" title="Mihai Țică" href="mailto:mitica@adobe.com">
<link rel="help" href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode">
<meta name="flags" content="dom"/>
<meta name="assert" content="Test checks that an element having mix-blend-mode blends with an overlapping sibling element having 3D transform and transition">
<style type="text/css">
.parent {
position: relative;
z-index: 1;
float: left;
margin-left: 10px;
}
.blended {
background: blue;
margin-top: -120px;
width: 140px;
position: relative;
z-index: 1;
height: 140px;
mix-blend-mode: difference;
}
.siblingOfBlended {
background: aqua;
width: 100px;
height: 100px;
margin-top: 20px;
margin-left: 20px;
transition: transform 2s;
}
.rotated {
transform: rotateX(60deg) rotateY(10deg) rotateZ(90deg);
}
.ref .blended {
mix-blend-mode: normal;
}
.ref .siblingOfBlended {
z-index: 2;
position: relative;
background: lime;
}
</style>
</head>
<body>
<p>Test passes if you can see two blue rectangles having inside a lime rotating rectangle each.<br>
Lime rectangles should look identical when while rotating.</p>
<div>
<div class="parent">
<div class="siblingOfBlended" id="sibling"></div>
<div class="blended"></div>
</div>
<div class="parent ref">
<div class="siblingOfBlended ref" id="siblingref"></div>
<div class="blended"></div>
</div>
</div>
<script type="text/javascript">
var sibling = document.getElementById('sibling');
var siblingref = document.getElementById('siblingref');
function rotate (el, cl) {
if (el.className === cl + ' rotated')
el.className = cl;
else
el.className = cl + ' rotated';
}
setTimeout(function () { rotate(sibling, 'siblingOfBlended'); rotate(siblingref, 'siblingOfBlended ref'); }, 0);
setInterval(function () { rotate(sibling, 'siblingOfBlended'); rotate(siblingref, 'siblingOfBlended ref'); }, 2000);
</script>
</body>
</html>