revert-val-010.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-010.html - WPT Dashboard Interop Dashboard

<!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>