[Event-returnValue.html]
  [When an event is created, returnValue should be initialized to true.]
    expected: FAIL

  [preventDefault() should not change returnValue if cancelable is false.]
    expected: FAIL

  [returnValue=false should have no effect if cancelable is false.]
    expected: FAIL

  [preventDefault() should change returnValue if cancelable is true.]
    expected: FAIL

  [initEvent should unset returnValue.]
    expected: FAIL

  [returnValue=true should have no effect once the canceled flag was set.]
    expected: FAIL

