[popover-nested-in-button.html]
  [clicking a popover nested inside a button should not re-invoke the popover]
    expected: FAIL

  [corner case: invoker that is also a popover]
    expected: FAIL

  [invoker inside popover still works, even with weird nesting]
    expected: FAIL

  [invoker inside popover still works, even inside of a shadowroot]
    expected: FAIL