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I have validate my site by http://validator.w3.org/check?uri=referer, and the result is Valid XHTML 1.0 Transitional! But when checked by http://jigsaw.w3.org/css-validator/check/referer, it is say: Please, validate your XML document first! Line 1 Column 165 Element type "null" must be followed by either attribute specifications, ">" or "/>".
Fixed, see http://qa-dev.w3.org:8001/css-validator/