Comment 32 for bug 747197

Neither TABLE nor TD elements have a background attribute (in HTML 4.0) which is
why it isn't fixed up. I could add fixup for such quirks if people feel the
practice is prevalent enough.

As for inline/external styles with url declarations such as this:

  BODY {
    color: black;
    background: url(http://foo.com/texture.gif);
  }

I don't believe there is much that can be done until we have a way to serialize
CSS from it's in-memory representation (DOM).