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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Timeline offset in Animation Keyframes</title>
<link rel="help" href="https://drafts.csswg.org/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 {
entry 0%, exit 100% { opacity: 0 }
entry 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 => {
await waitForNextFrame();
// scrollTop=200 to 400 is the entry range
container.scrollTop = 200;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0',
'Effect at entry 0%');
container.scrollTop = 300;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0.5',
'Effect at entry 50%');
container.scrollTop = 400;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '1',
'Effect at entry 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 entry 100%, then resize the
// container in a way that scrollTop is the same, but now the animation is
// at entry 50% and check opacity. After changing the height of container,
// scrollTop=300-500 is the entry range
container.scrollTop = 400;
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '1',
'Effect at entry 100%');
// Reducing the viewport by 100px, shifts the keyframe offsets.
// The entry range shifts from [200px, 400px] to [300px, 500px].
container.style.height = '300px';
await waitForNextFrame();
assert_equals(getComputedStyle(subject).opacity, '0.5',
'Effect at entry 50% (post resize)');
// 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% (post resize)');
});
}
</script>
</html>
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