servo/tests/wpt/web-platform-tests/css/compositing/mix-blend-mode/mix-blend-mode-transition.html

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HTML

<!DOCTYPE html>
<html>
<head>
<title>CSS Test: Blended element with transition</title>
<link rel="author" title="Mihai Tica" href="mailto:mitica@adobe.com">
<link rel="help" href="https://drafts.fxtf.org/compositing-1/#mix-blend-mode">
<meta name="assert" content="Test checks that an element having a transition applied on opacity blends with the parent element.">
<meta name="flags" content="dom"/>
<link rel="reviewer" title="Rik Cabanier" href="mailto:cabanier@adobe.com">
<link rel="reviewer" title="Mirela Budaes" href="mailto:mbudaes@adobe.com">
<link rel="match" href="reference/mix-blend-mode-transition-ref.html">
<style type="text/css">
div {
width: 100px;
height: 100px;
background: #FF0;
}
#blender {
background: #F00;
mix-blend-mode: difference;
transition: opacity 1s ease;
}
.opaqueBox {
opacity: 0.4;
}
</style>
</head>
<body>
<p>Test passes if you can see a fading green rectangle.</p>
<div><div id="blender"></div></div>
<script type="text/javascript">
setInterval(function(){ document.getElementById('blender').className = 'opaqueBox'; }, 100);
</script>
</body>
</html>