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Example: .méxico { display: inline } Submitted via file input (in a file encoded as UTF-8 with BOM), it passes, as expected. When submitted via direct input, the validator reports: Lexical error at line 1, column 3. Encountered: "?" (63), after : "" .m??xico { display: inline } Adding @charset "utf-8"; at the start does not help. So apparently the validator cannot read non-Ascii data. As a minimal fix, please add a remark about this in the Validate by Direct Input user interface.