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The CSS validator allows HTML-cum-CSS as input only in URI mode (and using the media type to determine whether it is checking CSS or some markup language with CSS in it). It would be nice to allow html-with-css in the other two input modes. Media type may be replaced by a drop-down in direct input mode, and we'd need a way to not look for stylesheets identified with relative URIs, and warn that they could not be checked.
*** This bug has been marked as a duplicate of bug 152 ***