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XHTML XHTL-FM (Veracruz)Tài liệu tham khảo
WikiPedia: XHTML http://hixie.ch/advocacy/xhtml http://www.tanphatcomputer.com/download/XHTML%20(w... http://validate.sf.net http://validator.w3.org/ http://www.w3.org/MarkUp/ http://www.w3.org/TR/xhtml1/ http://www.w3.org/TR/xhtml11/ http://www.w3.org/TR/xhtml2/ http://www.wikibooks.org/wiki/Programming:XHTML