[CSSStyleSheet-constructable-duplicate.html]
  [Duplicate stylesheets have the right cascade position in the Document]
    expected: FAIL

  [Appending duplicate stylesheets yields the correct cascade position in the Document]
    expected: FAIL

  [Appending duplicate stylesheets yields the correct cascade position in the ShadowRoot]
    expected: FAIL

  [Duplicate stylesheets have the right cascade position in the ShadowRoot]
    expected: FAIL