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* " CSS A resource is considered a valid CSS resource if it conforms to the grammar defined in [CSS], Appendix B (see note below). Note: The presence of at-rules, properties or values or combinations of properties and values that are not specified in [CSS] does not constitute a validity failure for CSS. See 3.21 STYLE_SHEETS_USE for treatment of such values. In addition, the @media at-rule and the presentation media qualifiers for the @import at-rule are taken into account when evaluating CSS." This is a contradiction: The CSS1 grammar does not allow at-rules other than @import. How about the following wording (if that's what you mean)? "A resource is considered a valid CSS resource if it conforms to the grammar defined in [CSS], Appendix B, apart from possible uses of @media at-rules with optional presentation media qualifiers."