<!DOCTYPE html>
<link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-timeline">
<link rel="help" src="https://drafts.csswg.org/web-animations/#playing-an-animation-section">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style>
  @keyframes expand {
    from { width: 100px; }
    to { width: 200px; }
  }

  .test {
    width: 0px;
    animation-name: expand;
    animation-duration: 1s;
  }

  #element_timeline_none {
    animation-timeline: none;
  }
  #element_unknown_timeline {
    animation-timeline: --unknown_timeline;
  }

</style>
<div class=test id=element_timeline_none></div>
<div class=test id=element_unknown_timeline></div>
<script>
  promise_test(async (t) => {
    assert_equals(getComputedStyle(element_timeline_none).width, '100px');
    await waitForAnimationFrames(3);
    assert_equals(getComputedStyle(element_timeline_none).width, '100px');
  }, 'Animation with animation-timeline:none holds current time at zero');

  promise_test(async (t) => {
    assert_equals(getComputedStyle(element_unknown_timeline).width, '100px');
    await waitForAnimationFrames(3);
    assert_equals(getComputedStyle(element_unknown_timeline).width, '100px');
  }, 'Animation with unknown timeline name holds current time at zero');
</script>
