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As far as I can see in the specification CSS files can contain all possible Unicode characters if the "@charset" declaration in them allows that. There seem to be 2 problems in the CssParser.jj file. First, in the options{} block you should set the "UNICODE_INPUT = true;" property so that the parser can handle unicode chars if the reader was correctly built. Then, the NONASCII token should probably be declared as: ~["\000"-"\177"] This means anything but ASCII. I will try to attach 2 test files. The XML is correctly displayed in Firefox but the validator complains about the CSS file
Created attachment 552 [details] CSS file with UNICODE character 010D
Created attachment 553 [details] XML file
Should be fixed by recent updates on the @charset support.