Comment 12 for bug 350407

Also Save Page As does not flatten the url() items in the CSS file(s).

In the HTML, an image element is correctly flattened, e.g.
    <img src="http://www.somewhere.com/logo.png">
becomes
    <img src="saveasfolder/logo.png">

In CSS, images should also be flattened - but are not. E.g.
    body { background-image: url(http://www.somewhere.com/background.png); }
should become
    body { background-image: url(saveasfolder/background.png); }

The same applies for the other syntactic variants of the same thing (i.e. with
or without ' quote marks, with or without the url() lexical token.

Rick :-)