[Event-subclasses-constructors.html]
  type: testharness
  [CompositionEvent constructor (no argument)]
    expected: FAIL

  [CompositionEvent constructor (undefined argument)]
    expected: FAIL

  [CompositionEvent constructor (null argument)]
    expected: FAIL

  [CompositionEvent constructor (empty argument)]
    expected: FAIL

  [CompositionEvent constructor (argument with default values)]
    expected: FAIL

  [CompositionEvent constructor (argument with non-default values)]
    expected: FAIL