[KeyframeEffect-setKeyframes.tentative.html]
  [KeyframeEffect.setKeyframes() causes subsequent changes to animation-timing-function to be ignored]
    expected: FAIL

  [KeyframeEffect.setKeyframes() causes subsequent changes to @keyframes rules to be ignored]
    expected: FAIL

  [KeyframeEffect.setKeyframes() should NOT cause subsequent changes to @keyframes rules to be ignored if it threw]
    expected: FAIL