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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 { opacity: 0 }
to { opacity: 1 }
}
#scroller {
border: 10px solid lightgray;
overflow-y: scroll;
width: 300px;
height: 200px;
}
#target {
margin: 800px 0px;
width: 100px;
height: 100px;
z-index: -1;
background-color: green;
animation: anim auto linear;
animation-timeline: scroll();
/* Sentinel value when in before or after phase of the animation. */
opacity: 0.96875;
}
</style>
<body>
<div id=scroller>
<div id=target></div>
</div>
</body>
<script type="text/javascript">
async function runTest() {
function assert_opacity_equals(expected, errorMessage) {
assert_approx_equals(
parseFloat(getComputedStyle(target).opacity), expected, 1e-6,
errorMessage);
}
promise_test(async t => {
await waitForNextFrame();
const anim = document.getAnimations()[0];
await anim.ready;
await waitForNextFrame();
scroller.scrollTop =
(scroller.scrollHeight - scroller.clientHeight) / 2;
await waitForNextFrame();
const baseOpacity = 0.96875;
// Delays are percentages.
const testData = [
{ delay: 0, endDelay: 0, opacity: 0.5 },
{ delay: 20, endDelay: 0, opacity: 0.375 },
{ delay: 0, endDelay: 20, opacity: 0.625 },
{ delay: 20, endDelay: 20, opacity: 0.5 },
// // Negative delays.
{ delay: -25, endDelay: 0, opacity: 0.6 },
{ delay: 0, endDelay: -25, opacity: 0.4 },
{ delay: -25, endDelay: -25, opacity: 0.5 },
// Stress tests with >= 100% total delay. Verify effect is inactive.
{ delay: 100, endDelay: 0, opacity: baseOpacity },
{ delay: 0, endDelay: 100, opacity: baseOpacity },
{ delay: 100, endDelay: 100, opacity: baseOpacity }
];
testData.forEach(test => {
anim.effect.updateTiming({
delay: CSS.percent(test.delay),
endDelay: CSS.percent(test.endDelay)
});
assert_opacity_equals(
test.opacity,
`Opacity when delay=${test.delay} and endDelay=${test.endDelay}`);
});
}, 'ScrollTimeline with animation delays as percentages');
}
window.onload = runTest;
</script>
</html>
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