[Webkit-unassigned] [Bug 191187] New: [Web Animations] Stop skipping imported/w3c/web-platform-tests/web-animations/timing-model/timelines/update-and-send-events.html

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191187

            Bug ID: 191187
           Summary: [Web Animations] Stop skipping
                    imported/w3c/web-platform-tests/web-animations/timing-
                    model/timelines/update-and-send-events.html
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at apple.com
                CC: dino at apple.com

One of the subtests in imported/w3c/web-platform-tests/web-animations/timing-model/timelines/update-and-send-events.html is skipped because it fails with a flaky output:

promise_test(async t => {
  const div = createDiv(t);
  getComputedStyle(div).marginLeft;
  div.style = 'transition: margin-left 100s; margin-left: 100px;';
  const anim = div.getAnimations()[0];

  let receivedEvents = [];
  anim.oncancel = event => receivedEvents.push(event);

  const eventWatcher = new EventWatcher(t, div, 'transitionstart');
  await eventWatcher.wait_for('transitionstart');

  const timeInEventCallback = document.timeline.currentTime;

  // Calling cancel() queues a cancel event
  anim.cancel();

  await waitForAnimationFrames(1);
  assert_times_equal(timeInEventCallback, document.timeline.currentTime,
    'A rAF callback should happen in the same frame');

  assert_array_equals(receivedEvents, [],
    'The queued cancel event shouldn\'t be dispatched in the same frame');

  await waitForAnimationFrames(1);
  assert_array_equals(receivedEvents.map(event => event.type), ['cancel'],
    'The cancel event should be dispatched in a later frame');
}, 'Queues a cancel event in transitionstart event callback');

We need to stop skipping this test

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