revert-val-006.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-cascade/revert-val-006.html - WPT Dashboard Interop Dashboard

<!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>