[visibility-collapse-rowspan-004-dynamic.html]
  expected:
    if (os == "android") and fission: [OK, TIMEOUT]
  [(2nd collapse) spanning cell shrinks to sum of remaining three rows' height]
    expected:
      if os == "mac": FAIL

  [spanning cell shrinks to sum of remaining three rows' height]
    expected:
      if os == "mac": FAIL