[reverse-animation.html]
  [Reversing an animation inverts the playback rate]
    expected: FAIL

  [Reversing an animation does not cause it to resolve the ready promise]
    expected: FAIL

  [Reversing an animation without an active timeline throws an InvalidStateError]
    expected: FAIL

  [Reversing an animation plays a pausing animation]
    expected: FAIL

  [Reversing an animation does not cause it to leave the pending state]
    expected: FAIL

  [Reversing should use the negative pending playback rate]
    expected: FAIL

  [Reversing when when playbackRate == 0 should preserve the playback rate]
    expected: FAIL

  [Reversing an animation resets a sticky start time.]
    expected: FAIL

  [Setting current time while reverse-pending preserves currentTime]
    expected: FAIL

  [Reversing an animation with a negative playback rate should cause the animation to play in a forward direction]
    expected: FAIL

  [Reversing an idle animation aligns startTime with the rangeEnd boundary]
    expected: FAIL