<!DOCTYPE html>
<title>CSS Cascade: 'revert' in keyframe animations on identical elements</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>
<style>
  @keyframes test {
    from { margin-top: revert; }
    to { margin-top: 100px; }
  }
  .anim {
    margin-top: 0px;
    animation: test linear 1s paused;
  }
</style>
<h1 class="anim"></h1>
<h1 class="anim"></h1>
<h1 class="anim"></h1>
<h1 id=ref></h1>
<script>
  test(function() {
    // This querySelectorAll includes #ref, but that's OK.
    let targets = document.querySelectorAll('h1');
    for (let t of targets) {
      let actual = getComputedStyle(t).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);
    }
  }, 'A @keyframe animation with revert works when applied to multiple identical elements');
</script>