[root-margin-root-element.html]
  expected:
    if (os == "android") and fission: [OK, TIMEOUT]
  [root.scrollTop = 0]
    expected:
      if os == "android": FAIL

  [root.scrollTop = 50 with root scrolled out of view.]
    expected:
      if os == "android": FAIL

  [First rAF]
    expected:
      if os == "android": FAIL

  [root.scrollTop = 50, putting target into root margin]
    expected:
      if os == "android": FAIL