[document-has-system-focus.html]
  expected:
    if (os == "win") and fission: [OK, TIMEOUT]
    if (os == "linux"): [TIMEOUT, OK]
    if (os == "mac") and fission: [TIMEOUT, OK]
  [Top-level document receives blur/focus events and loses system focus during opening/closing of a popup]
    expected:
      if (os == "win") and fission: [TIMEOUT, PASS]
      if (os == "linux"): [TIMEOUT, PASS]
      if (os == "mac") and fission: [TIMEOUT, PASS]
      if (os == "linux") and fission and not debug: [TIMEOUT, PASS]
