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I presume that the CSS [attr="\\""] {} is illegal, yet the validator gives no error. (Tested using direct input.) Regards, Cecil Ward.
Created attachment 421 [details] selector parsing entering test case similar to the one described at http://www.w3.org/Bugs/Public/show_bug.cgi?id=2800#c0
fixed in CVS by Jean-Guilhem Rouel. Testable at: http://qa-dev.w3.org:8001/css-validator/validator?uri=http%3A%2F%2Fwww.w3.org%2FBugs%2FPublic%2Fattachment.cgi%3Fid%3D421 (now reports a Lexical error) Should be in the production service shortly.