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chromium/third_party/blink/web_tests/external/wpt/web-animations/interfaces/AnimationPlaybackEvent/constructor.html 

<!doctype html>
<meta charset=utf-8>
<title>AnimationPlaybackEvent constructor</title>
<link rel="help"
      href="https://drafts.csswg.org/web-animations/#dom-animationplaybackevent-animationplaybackevent">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
'use strict';

test(t => {
  const evt = new AnimationPlaybackEvent('finish');
  assert_equals(evt.type, 'finish');
  assert_equals(evt.currentTime, null);
  assert_equals(evt.timelineTime, null);
}, 'Event created without an event parameter has null time values');

test(t => {
  const evt =
    new AnimationPlaybackEvent('cancel', {
      currentTime: -100,
      timelineTime: 100,
    });
  assert_equals(evt.type, 'cancel');
  assert_equals(evt.currentTime, -100);
  assert_equals(evt.timelineTime, 100);
}, 'Created event reflects times specified in constructor');

</script>