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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Timeline offset in Animation Keyframes</title>
<link rel="help" href="https://w3c.github.io/csswg-drafts/scroll-animations-1/#named-range-keyframes">
<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 fade-in-out-animation {
enter 0%, exit 100% { opacity: 0 }
enter 100%, exit 0% { opacity: 1 }
}
#subject {
background-color: rgba(0, 0, 255);
height: 200px;
width: 200px;
view-timeline-name: foo;
animation: linear 1s both fade-in-out-animation;
animation-timeline: foo;
}
#container {
border: 5px solid black;
height: 400px;
width: 400px;
overflow-y: scroll;
resize: both;
}
.spacer {
height: 600px;
width: 100%;
}
</style>
<body onload="runTests()">
<div id="container">
<div class="spacer"></div>
<div id="subject"></div>
<div class="spacer"></div>
</div>
</body>
<script type="text/javascript">
setup(assert_implements_animation_timeline);
function runTests() {
promise_test(async t => {
// scrollTop=200 to 400 is the enter range
container.scrollTop = 200;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0', 'Effect at enter 0%');
container.scrollTop = 300;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0.5', 'Effect at enter 50%');
container.scrollTop = 400;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '1', 'Effect at enter 100%');
// scrollTop=600-800 is the exit range
container.scrollTop = 600;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '1', 'Effect at exit 0%');
container.scrollTop = 700;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0.5', 'Effect at exit 50%');
container.scrollTop = 800;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0', 'Effect at exit 100%');
// First change scrollTop so that you are at enter 100%, then resize the container in a way
// that scrollTop is the same, but now the animation is at enter 50% and check opacity.
// After changing the height of container, scrollTop=300-500 is the enter range
container.scrollTop = 400;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '1', 'Effect at enter 100%');
container.style.height = '300px';
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0.5', 'Effect at enter 50%');
// After changing the height of container, scrollTop=600-800 is still the exit range
container.scrollTop = 700;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0.5', 'Effect at exit 50%');
});
}
</script>
</html>
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