[underline_namespace.html]
  disabled:
    if (os == "win"): https://bugzilla.mozilla.org/show_bug.cgi?id=1536762
    if (os == "android"): https://bugzilla.mozilla.org/show_bug.cgi?id=1536762
  fuzzy:
    if (os == "mac"): underline_namespace-ref.html:maxDifference=0-17;totalPixels=0-386
    underline_namespace-ref.html:maxDifference=0-2;totalPixels=0-300