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<!DOCTYPE html>
<title>CSS Cascade: 'revert' keyword in keyframe animations</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade/#default">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@keyframes test {
from { margin-top: 0px; }
50% { margin-top: revert; }
to { margin-top: 0px; }
}
#h1 {
margin-top: 0px;
animation: test linear 1000s -500s;
}
</style>
<h1 id=h1></h1>
<h1 id=ref></h1>
<script>
test(function() {
let actual = getComputedStyle(h1).marginTop;
let expected = getComputedStyle(ref).marginTop;
// This test assumes that the UA style sheet sets a non-0px value on
// <h1> elements:
assert_not_equals(expected, '0px');
assert_equals(actual, expected);
}, 'The revert keyword works with @keyframes');
</script>
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