mozilla-central/testing/web-platform/tests/scroll-animations/css/timeline-offset-keyframes-with-document-timeline.html

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Test Info: Warnings

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="support/testcommon.js"></script>
<script src="/web-animations/resources/keyframe-utils.js"></script>
<title>Animation range and delay</title>
</head>
<style type="text/css">
@keyframes anim {
cover 100% {
margin-right: 0px;
}
cover 0% {
margin-left: 0px;
}
50% {
opacity: 0.5;
}
}
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
overflow-x: hidden;
width: 300px;
height: 200px;
}
#target {
margin-bottom: 800px;
margin-top: 800px;
margin-left: 10px;
margin-right: 10px;
width: 100px;
height: 100px;
z-index: -1;
background-color: green;
animation: anim auto both linear;
/* using document timeline by default */
}
</style>
<body>
<div id="scroller">
<div id="target"></div>
</div>
</body>
<script type="text/javascript">
async function runTest() {
promise_test(async t => {
await waitForNextFrame();
const anim = document.getAnimations()[0];
await anim.ready;
await waitForNextFrame();
// Using a document timeline, so only the 50% keyframe is used.
let frames = anim.effect.getKeyframes();
let expected = [
{ offset: 0, computedOffset: 0, opacity: "1", easing: "linear",
composite: "replace" },
{ offset: 0.5, computedOffset: 0.5, opacity: "0.5", easing: "linear",
composite: "auto" },
{ offset: 1, computedOffset: 1, opacity: "1", easing: "linear",
composite: "replace" },
{ offset: { rangeName: "cover", offset: CSS.percent(100) },
computedOffset: null, marginRight: "0px", composite: "auto",
easing: "linear" },
{ offset: { rangeName: "cover", offset: CSS.percent(0) },
computedOffset: null, marginLeft: "0px", composite: "auto",
easing: "linear" }
];
assert_frame_lists_equal(frames, expected);
}, 'Keyframes with timeline-offsets reported but not reachable when ' +
'using a document timeline');
}
window.onload = runTest;
</script>