[popover-shadow-dom.html]
  [Popovers located inside shadow DOM can still be shown]
    expected: FAIL

  [anchor references do not cross shadow boundaries]
    expected: FAIL

  [anchor references use the flat tree not the DOM tree]
    expected: FAIL

  [The popover stack is preserved across shadow-inclusive ancestors]
    expected: FAIL

  [Popover ancestor relationships are within a root, not within the document]
    expected: FAIL