[cross-origin-iframe.sub.html]
  [First rAF]
    expected:
      if not fission and (os == "mac") and debug: PASS
      if not fission and (os == "android") and debug: PASS
      if fission: FAIL
      [PASS, FAIL]

  [topDocument.scrollingElement.scrollTop = 100]
    expected:
      if fission: FAIL

  [iframeDocument.scrollingElement.scrollTop = 250]
    expected:
      if fission and (os == "linux"): [PASS, FAIL]

  [topDocument.scrollingElement.scrollTop = 200]
    expected:
      if fission and (os == "linux"): [PASS, FAIL]
