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<!DOCTYPE html>
<link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-timeline">
<link rel="help" src="https://drafts.csswg.org/web-animations/#playing-an-animation-section">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
@keyframes expand {
from { width: 100px; }
to { width: 200px; }
}
.test {
width: 0px;
animation-name: expand;
animation-duration: 1s;
}
#element_timeline_none {
animation-timeline: none;
}
#element_unknown_timeline {
animation-timeline: --unknown_timeline;
}
</style>
<div class=test id=element_timeline_none></div>
<div class=test id=element_unknown_timeline></div>
<script>
promise_test(async (t) => {
assert_equals(getComputedStyle(element_timeline_none).width, '100px');
await waitForAnimationFrames(3);
assert_equals(getComputedStyle(element_timeline_none).width, '100px');
}, 'Animation with animation-timeline:none holds current time at zero');
promise_test(async (t) => {
assert_equals(getComputedStyle(element_unknown_timeline).width, '100px');
await waitForAnimationFrames(3);
assert_equals(getComputedStyle(element_unknown_timeline).width, '100px');
}, 'Animation with unknown timeline name holds current time at zero');
</script>
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