[animation-timeline-ignored.tentative.html]
  [animation-timeline ignored after setting timeline with JS (ScrollTimeline from JS)]
    expected: FAIL

  [animation-timeline ignored after setting timeline with JS (ScrollTimeline from CSS)]
    expected: FAIL

  [animation-timeline ignored after setting timeline with JS (document timeline)]
    expected: FAIL

  [animation-timeline ignored after setting timeline with JS (null)]
    expected: FAIL