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<!DOCTYPE html>
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#scroll-timelines">
<link rel="help" src="https://drafts.csswg.org/scroll-animations-1/#avoiding-cycles">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
#scroller {
overflow: scroll;
width: 100px;
height: 100px;
}
#contents {
height: 200px;
}
@keyframes expand {
from { width: 100px; }
to { width: 200px; }
}
#element {
width: 0px;
animation: expand 10s linear paused;
animation-timeline: timeline;
}
</style>
<div id="container">
<div id=element></div>
</div>
<script>
promise_test(async (t) => {
let div = document.createElement('div');
div.setAttribute('id', 'scroller');
div.style.scrollTimeline = 'timeline';
div.innerHTML = '<div id=contents></div>';
try {
container.insertBefore(div, element);
// The source has no layout box at the time the scroll timeline is created.
assert_equals(getComputedStyle(element).width, '0px');
scroller.offsetTop; // Ensure a layout box for the scroller.
// Wait for an update to the timeline state:
await waitForNextFrame();
// The timeline should now be active, and the animation should apply:
assert_equals(getComputedStyle(element).width, '100px');
} finally {
div.remove();
}
}, 'Animation does not apply when timeline is initially inactive');
</script>
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