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Please consider making the spec state that media queries in the "media" attribute must not contain CSS comments. (In other words, that authors must not use comments in media queries in the "media" attribute.) I can't think of any sane use cases for allowing CSS comments in there. UAs would still need to support parsing of "media" values that contain comments but conformance checkers would report them as invalid.
If they work everywhere, what's the value of disallowing them?
(In reply to Ian 'Hixie' Hickson from comment #1) > If they work everywhere, what's the value of disallowing them? The value is that there's no good reason for HTML attribute values to contain CSS comments, so just because HTML @media attribute parsers handle CSS comments, that doesn't mean we should implicitly encourage authors to use them. Postel's law and all that. We obviously have plenty of other examples in HTML where the document-conformance rules are stricter than the parsing rules. But I don't feel strongly about it at this point. Feel free to wontfix this.
There's not really any good reason for media queries in general to have inline comments, but that's what the CSS specs allow. I think it's something we should leave up to the CSS side, rather than try to invent a new authoring syntax just for the media="" attribute.