[event-global.html]
  [window.event is undefined if the target is in a shadow tree (event dispatched outside shadow tree)]
    expected: FAIL

  [window.event is undefined if the target is in a shadow tree (event dispatched inside shadow tree)]
    expected: FAIL

  [window.event is undefined inside window.onerror if the target is in a shadow tree (ErrorEvent dispatched inside shadow tree)]
    expected: FAIL