The CSS Validator appears to be incorrectly strict. On either page below, they will pass the HTML Validator. It is the CSS Validator that is causing problems. I made a quick test you can run that will bring up the error. I uploaded two files for you. One, at 1A1A,1A1A,FFFFhttp://www.pepino.com/pepinotest.html has XHTML Transitional the way it worked last year. <1A1A,1A1A,FFFFhttp://www.w3.org/TR/2000/REC-xhtml1-20000126/DTD/xhtml1-transitional.dtd"> < Try and run it through the CSS validator at 1A1A,1A1A,FFFFhttp://jigsaw.w3.org/css-validator/validator-uri.html You can use this URL for a shortcut to the test: 1A1A,1A1A,FFFFhttp://jigsaw.w3.org/css-validator/validator?uri=http://www.pepino.com/pepinotest.html The other, at 1A1A,1A1A,FFFFhttp://www.pepino.com/pepinotest2.html has XHTML with the URL at the end of the DTD spec changed to "1A1A,1A1A,FFFFhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" It will pass the CSS validator. Here is a shortcut for this test: 1A1A,1A1A,FFFFhttp://jigsaw.w3.org/css-validator/validator?uri=http://www.pepino.com/pepinotest2.html Why is the Validator giving an error to pages that had been using the original XHTML spec? Thanks