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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Change animation-range after creation</title>
<link rel="help" src="https://www.w3.org/TR/scroll-animations-1/#named-range-animation-declaration">
<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>
<style>
@keyframes anim {
from { z-index: 0; background-color: skyblue;}
to { z-index: 100; background-color: coral; }
}
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
width: 200px;
height: 200px;
}
/* Reset specificity to allow animation-range-* from .restrict-range to win. */
:where(#target) {
margin: 800px 0px;
width: 100px;
height: 100px;
z-index: -1;
background-color: green;
animation: anim auto both linear;
animation-timeline: --t1;
view-timeline: --t1 block;
}
.restrict-range {
animation-range-start: contain 0%;
animation-range-end: contain 100%;
}
</style>
<body>
<div id=scroller>
<div id=target></div>
</div>
</body>
<script type="text/javascript">
setup(assert_implements_animation_timeline);
async function scrollTop(e, value) {
e.scrollTop = value;
await waitForNextFrame();
}
async function waitForAnimationReady(target) {
await waitForNextFrame();
await Promise.all(target.getAnimations().map(x => x.promise));
}
async function assertValueAt(scroller, target, position, expected) {
await waitForAnimationReady(target);
await scrollTop(scroller, position);
assert_equals(getComputedStyle(target).zIndex, expected.toString());
}
promise_test(async t => {
const scroller = document.getElementById('scroller');
const target = document.getElementById('target');
waitForAnimationReady(target);
await assertValueAt(scroller, target, 600, 0);
await assertValueAt(scroller, target, 700, 33);
await assertValueAt(scroller, target, 750, 50);
await assertValueAt(scroller, target, 800, 67);
target.classList.toggle('restrict-range');
await waitForNextFrame();
await assertValueAt(scroller, target, 700, 0);
await assertValueAt(scroller, target, 750, 50);
await assertValueAt(scroller, target, 800, 100);
}, 'Ensure that animation is updated on a style change');
</script>
</html>
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