[idlharness.html]
  [HTMLElement interface: attribute ontransitionstart]
    expected: FAIL

  [HTMLElement interface: document must inherit property "ontransitionstart" with the proper type]
    expected: FAIL

  [Window interface: window must inherit property "ontransitionstart" with the proper type]
    expected: FAIL

  [Document interface: attribute ontransitionstart]
    expected: FAIL

  [Document interface: document must inherit property "ontransitionstart" with the proper type]
    expected: FAIL

  [Window interface: attribute ontransitionstart]
    expected: FAIL