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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Animating pseduo-element on scroller</title>
</head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="testcommon.js"></script>
<style type="text/css">
.scroller {
overflow: auto;
width: 100px;
height: 100px;
margin: 1em;
outline: 1px solid;
animation: bg linear;
animation-timeline: scroll(self inline);
}
.pseudo::before {
content: "";
display: block;
width: 200px;
height: 50px;
background: red;
animation: bg linear reverse;
animation-timeline: scroll(inline);
}
@keyframes bg {
from {
background: rgb(0, 255, 0);
}
to {
background: rgb(0, 0, 255);
}
}
</style>
<body>
<div class="scroller pseudo"></div>
<div id="log"></div>
</body>
<script type="text/javascript">
'use strict';
promise_test(async t => {
const scroller = document.querySelector('.scroller');
await waitForNextFrame();
assert_equals(getComputedStyle(scroller).backgroundColor, 'rgb(0, 255, 0)');
assert_equals(getComputedStyle(scroller, ':before').backgroundColor,
'rgb(0, 0, 255)');
}, `scroll nearest on pseudo-element attaches to parent scroll container`);
</script>
</html>
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