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I've tried to validate my (very simple) page but got this error: "Target: http://cakecrossing.webpark.pl/index_css.htm Please, validate your XML document first! Line 4 Column 6 The processing instruction target matching "[xX][mM][lL]" is not allowed." The problem is that I did validate this here: http://validator.w3.org/check?uri=http%3A%2F%2Fcakecrossing.webpark.pl%2Findex_css.htm&charset=%28detect+automatically%29&doctype=Inline&verbose=1 CSS validating link: http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%2Fcakecrossing.webpark.pl%2Findex_css.htm So this is some kind of a bug in on of those validators. I'm going to leave that file for a while so you can experiment. Please notify me when you will finish, so I can delete it. PS: Deleting "<?xml version="1.0" encoding="windows-1250"?>" fixed the problem, but it should either validate in both or find errors in both.
The Markup Validator points out that it has only limited support for XML in the results; this is one of these limitations, the CSS Validator is correct, if you want to give a XML declaration <?xml ...?> it must be the very very first thing in the document. *** This bug has been marked as a duplicate of 12 ***