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On http://www.validome.org/validate?verbose=1&uri=http%3A%2F%2Fsipt07.si.ehu.es%2Fevalaccess2%2Fcrawler.html, they found: Invalid value "%80" in attribute "size". But http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fsipt07.si.ehu.es%2Fevalaccess2%2Fcrawler.html said valid.
The W3C markup validator validates documents against DTDs, and this case illustrates one of the limitations of DTDs. The value of the size attribute in XHTML 1.1 is defined as %Number.datatype, which in turn is defined as CDATA, and "%80" is valid CDATA. http://validator.w3.org/docs/help.html#validation_basics http://validator.w3.org/docs/help.html#validandconform