[constructor.html]
  [A KeyframeEffect can be constructed with a single keyframe sequence with a single calc() offset]
    expected: FAIL

  [A KeyframeEffect constructed with a single keyframe sequence with a single calc() offset roundtrips]
    expected: FAIL

  [A KeyframeEffect can be constructed with a single keyframe sequence with a complex calc() offset]
    expected: FAIL

  [A KeyframeEffect constructed with a single keyframe sequence with a complex calc() offset roundtrips]
    expected: FAIL