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<!DOCTYPE html>
<title>CSS Cascade: 'revert' appearing in setKeyframes</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade/#default">
<link rel="help" href="https://drafts.csswg.org/web-animations-1/#dom-keyframeeffect-setkeyframes">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<h1 id=h1></h1>
<script>
test(function() {
let original = parseInt(getComputedStyle(h1).marginTop);
// This test assumes that the UA style sheet sets a non-0px value on
// <h1> elements:
assert_not_equals(original, 0);
let animation = h1.animate([
{ marginTop: `${original*4}px` },
{ marginTop: `${original*8}px` },
], {
duration: 1000000,
delay: -500000,
easing: 'steps(2, end)'
});
let animated = parseInt(getComputedStyle(h1).marginTop);
assert_equals(animated, original*6);
animation.effect.setKeyframes([
{ marginTop: 'revert' },
{ marginTop: `${original*3}px` },
]);
let animated_revert = parseInt(getComputedStyle(h1).marginTop);
assert_equals(animated_revert, original*2);
}, 'The revert works when appearing in setKeyframes');
</script>
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