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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#named-timeline-range">
<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>
<title>Animation range and delay</title>
</head>
<style type="text/css">
@keyframes anim {
from { transform: scaleX(0) translateY(0); }
to { transform: scaleX(1) translatey(50vh); }
}
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
overflow-x: hidden;
width: 300px;
height: 200px;
}
.spacer {
height: 200px;
}
#target {
height: 50px;
background-color: green;
animation: anim auto both linear;
animation-timeline: view();
animation-range-start: contain 0%;
animation-range-end: contain 100%;
}
</style>
<body>
<div id=scroller>
<div class="spacer"></div>
<div id="target"></div>
<div class="spacer"></div>
</div>
</body>
<script type="text/javascript">
async function runTest() {
function assert_progress_equals(anim, expected, errorMessage) {
assert_approx_equals(
anim.effect.getComputedTiming().progress,
expected, 1e-6, errorMessage);
}
promise_test(async t => {
await waitForNextFrame();
const anim = document.getAnimations()[0];
await anim.ready;
await waitForNextFrame();
// @ contain 0%
scroller.scrollTop = 50;
await waitForNextFrame();
assert_progress_equals(anim, 0, 'progress at contain 0%');
// @ contain 50%
scroller.scrollTop = 125;
await waitForNextFrame();
assert_progress_equals(anim, 0.5, 'progress at contain 50%');
// @ contain 100%
scroller.scrollTop = 200;
await waitForNextFrame();
assert_progress_equals(anim, 1, 'progress at contain 100%');
}, 'ViewTimeline use untransformed box for range calculations');
}
window.onload = runTest;
</script>
</html>
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