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+<!DOCTYPE html>
+<title>CSS Cascade: 'revert' in final keyframe of web animation</title>
+<link rel="help" href="https://drafts.csswg.org/css-cascade/#default">
+<link rel="help" href="https://crbug.com/1065387">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<h1 id=h1></h1>
+<h1 id=ref></h1>
+<script>
+ test(function() {
+ let expected_lower = parseInt(getComputedStyle(ref).marginTop);
+ let expected_upper = expected_lower * 2;
+
+ h1.animate([
+ { marginTop: `${expected_lower * 4}px` },
+ { marginTop: `${expected_lower * 3}px` },
+ { marginTop: `${expected_lower * 2}px` },
+ { marginTop: 'revert' },
+ ], {
+ duration: 4000,
+ delay: -3500,
+ }).pause();
+
+ let actual = parseInt(getComputedStyle(h1).marginTop);
+
+ // This test assumes that the UA style sheet sets a non-0px value on
+ // <h1> elements:
+ assert_not_equals(expected_lower, 0);
+ assert_not_equals(expected_upper, 0);
+ assert_between_exclusive(actual, expected_lower, expected_upper);
+ }, 'The revert keyword works in the final frame of a web animation');
+</script>