[declarative-shadow-dom-opt-in.tentative.html]
  [DOMParser]
    expected: FAIL

  [Non-fragment parsing needs no opt-in]
    expected: FAIL

  [document.write allowed from synchronous script loaded from main document]
    expected: FAIL

  [iframe with no sandbox allows declarative Shadow DOM]
    expected: FAIL

  [sandboxed iframe allows declarative Shadow DOM]
    expected: FAIL

  [iframe, no sandbox]
    expected: FAIL

  [iframe]
    expected: FAIL

