[iframe_navigate_ancestor-1.sub.html]
  expected:
    if (os == "linux") and not debug and fission: [OK, TIMEOUT]
    if (os == "android") and fission: [OK, TIMEOUT]
  [A => B => B: B should be able to navigate B.]
    expected:
      if (os == "linux") and not debug and fission: [PASS, TIMEOUT]