[iframe-document-preserve.window.html]
  [moveBefore(): about:blank iframe's document is preserved]
    expected: FAIL

  [moveBefore(): simple same-origin document is preserved]
    expected: FAIL

  [moveBefore(): cross-origin iframe is preserved: remove new parent]
    expected: FAIL

  [moveBefore(): cross-origin iframe is preserved: remove self]
    expected: FAIL

  [moveBefore(): cross-origin iframe is preserved: remove self via replaceChildren()]
    expected: FAIL

  [moveBefore(): cross-origin iframe is preserved: remove self via innerHTML]
    expected: FAIL

  [window.frames ordering does not change due to moveBefore()]
    expected: FAIL