[scroll-cross-origin-iframes.html]
  expected:
    if (os == "win") and debug: OK
    if (os == "mac") and not debug: OK
    [OK, TIMEOUT]
  [Verify sibling cross-origin iframes can wheel-scroll.]
    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1965483
    expected:
      if (os == "win") and debug: PASS
      if (os == "mac") and not debug: PASS
      [PASS, TIMEOUT]