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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>
<script src="/web-animations/resources/keyframe-utils.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<title>Animation range updates play state</title>
</head>
<style type="text/css">
@keyframes anim {
from { background-color: blue; }
to { background-color: white; }
}
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
overflow-x: hidden;
width: 300px;
height: 200px;
}
#target {
margin-top: 800px;
margin-bottom: 800px;
margin-left: 10px;
margin-right: 10px;
width: 100px;
height: 100px;
z-index: -1;
background-color: green;
animation: anim auto both linear;
animation-timeline: t1;
view-timeline: t1;
}
</style>
<body>
<div id="scroller">
<div id="target"></div>
</div>
</body>
<script type="text/javascript">
async function runTest() {
promise_test(async t => {
anim = target.getAnimations()[0];
await anim.ready;
scroller.scrollTop = 750;
await waitForNextFrame();
// Animation is running in the active phase.
anim.rangeStart = 'contain 0%'; // 700px
anim.rangeEnd = 'contain 100%'; // 800px
assert_equals(anim.playState, 'running');
assert_percents_equal(anim.currentTime, 100/6);
// Animation in the after phase and switches to the finished state.
anim.rangeStart = 'entry 0%'; // 600px
anim.rangeEnd = 'entry 100%'; // 700px
assert_equals(anim.playState, 'finished');
// Clamp to effect end when finished.
assert_percents_equal(anim.currentTime, 100/3);
// Animation in the before phase and switches back to the running state.
anim.rangeStart = 'exit 0%'; // 800px
anim.rangeEnd = 'exit 100%'; // 900px
assert_equals(anim.playState, 'running');
assert_percents_equal(anim.currentTime, -100/6);
}, 'Changing the animation range updates the play state');
}
window.onload = runTest;
</script>
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