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<!DOCTYPE html>
<meta charset=utf-8>
<title>Root-scrolling timeline with animation moving from end point</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#scroll-notation">
<link rel="help" href="https://drafts.csswg.org/web-animations/#update-an-animations-finished-state">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-animations/support/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<script src="support/testcommon.js"></script>
<style>
@keyframes anim {
from { width: 100px; }
to { width: 200px; }
}
.fill-vh {
width: 100px;
height: 100vh;
}
</style>
<body>
<div id="log"></div>
<script>
'use strict';
setup(assert_implements_animation_timeline);
promise_test(async t => {
const div = addDiv(t, { style: 'width: 50px; height: 100px;' });
const filling = addDiv(t, { class: 'fill-vh' });
const scroller = document.scrollingElement;
scroller.scrollTop = 0;
await waitForNextFrame();
div.style.animation = 'anim 100s linear';
div.style.animationTimeline = 'scroll(root)';
await waitForCSSScrollTimelineStyle();
const anim = div.getAnimations()[0];
await anim.ready;
assert_percents_equal(anim.timeline.currentTime, 0,
'Timeline time when animation is ready');
assert_equals(getComputedStyle(div).width, '100px',
'Width at animation start');
await waitForNextFrame();
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = maxScroll;
await waitForNextFrame();
assert_equals(getComputedStyle(div).width, '200px',
'Width at scroll limit');
document.scrollingElement.scrollTop = 0;
await waitForNextFrame();
assert_equals(getComputedStyle(div).width, '100px',
'Width after reset to scroll top');
}, 'Test that the scroll animation is still responsive after moving from 100%');
</script>
</body>
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