chromium/third_party/blink/web_tests/external/wpt/svg/animations/seeking-events-3.html

<!DOCTYPE html>
<title>Seeking backwards does not dispatch events for skipped elements</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg>
  <rect width="50" height="100" fill="green">
    <set id="anim1" attributeName="fill" to="red" begin="5s" dur="1s" repeatCount="2" fill="freeze"/>
  </rect>
  <rect width="50" height="100" x="50" fill="green">
    <set id="anim2" attributeName="fill" to="red" begin="9s" dur="11s"/>
  </rect>
</svg>
<script>
  const SMIL_EVENTS = ['beginEvent', 'repeatEvent', 'endEvent'];

  promise_test(function(t) {
    let svg = document.querySelector('svg');
    svg.pauseAnimations();
    svg.setCurrentTime(10);
    new EventWatcher(t, document.getElementById('anim1'), SMIL_EVENTS);
    let anim2_watcher = new EventWatcher(t, document.getElementById('anim2'), SMIL_EVENTS);
    return anim2_watcher.wait_for('beginEvent').then(() => {
      svg.setCurrentTime(4);
      return anim2_watcher.wait_for('endEvent');
    });
  });
</script>