[timeline-scope.html]
  expected:
    if os == "mac": [OK, TIMEOUT]
  [Descendant can attach to deferred timeline]
    expected: FAIL

  [Dynamically re-attaching]
    expected: FAIL

  [Dynamically detaching]
    expected: FAIL

  [Removing/inserting element with attaching timeline]
    expected: FAIL

  [Ancestor attached element becoming display:none/block]
    expected:
      if os == "mac": [FAIL, TIMEOUT]
      FAIL

  [A deferred timeline appearing dynamically in the ancestor chain]
    expected:
      if os == "mac": [FAIL, NOTRUN]
      FAIL

  [Animations prefer non-deferred timelines]
    expected:
      if os == "mac": [PASS, NOTRUN]