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From http://jigsaw.w3.org/css-validator/BUGS.html '' The Validator passes the Accept-Language HTTP header to the server where the code to validate comes from. This conflicts sometimes with content negotiation facilities, i.e. you cannot validate pages written in languages you do not accept. I suggest adding '*' at the end of the list of accepted languages. ''
Done, it add ",*" if * is not present (leaving the possibility of having an explicit *;q=0.0 is a user wants to).