[object-fit-cover-png-001c.html]
  bug: https://bugzilla.mozilla.org/show_bug.cgi?id=856337
  fuzzy:
    if not webrender and (os != "android"): maxDifference=107;totalPixels=2070
    if not webrender and (os == "android"): maxDifference=169;totalPixels=4147
