[toggle-events.html]
  [dialog.show() should fire beforetoggle and toggle events.]
    expected: FAIL

  [dialog.show() should fire cancelable beforetoggle which does not open dialog if canceled]
    expected: FAIL

  [dialog.show() should coalesce asynchronous toggle events.]
    expected: FAIL

  [dialog.show() should not open if beforetoggle removes]
    expected: FAIL

  [dialog.show() should not open if beforetoggle calls showPopover]
    expected: FAIL

  [dialog.showModal() should fire beforetoggle and toggle events.]
    expected: FAIL

  [dialog.showModal() should fire cancelable beforetoggle which does not open dialog if canceled]
    expected: FAIL

  [dialog.showModal() should coalesce asynchronous toggle events.]
    expected: FAIL

  [dialog.showModal() should not double-set open/close if beforetoggle re-opens]
    expected: FAIL

  [dialog.showModal() should not open if beforetoggle removes]
    expected: FAIL

  [dialog.showModal() should not open if beforetoggle calls showPopover]
    expected: FAIL