[root-margin.html]
  [document.scrollingElement.scrollLeft = 100]
    expected:
      if (os == "mac") and debug: [FAIL, PASS]
      if (os == "mac") and not debug: [PASS, FAIL]
      FAIL

  [First rAF.]
    expected:
      if (os == "mac") and debug: [FAIL, PASS]
      if (os == "mac") and not debug: [PASS, FAIL]
      FAIL

  [document.scrollingElement.scrollTop = document.documentElement.clientHeight + 300]
    expected:
      if (os == "mac") and debug: [FAIL, PASS]
      if (os == "mac") and not debug: [PASS, FAIL]
      FAIL

  [document.scrollingElement.scrollTop = document.documentElement.clientHeight + 200]
    expected:
      if os == "android": FAIL