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A font-family definition such as the example from the working-draft (http://www.w3.org/TR/2005/WD-css3-values-20050726/): body { font-family: "Helvetica", "Univers", "Arial", sans-serif } fails to validate with an error: Invalid number : font-family Too many values or values are not recognized if you are using CSS-3 as the validation level. This error does not occur with the CSS-2 validator. font-family definitions that only have one font listed work ok.
http://qa-dev.w3.org:8001/css-validator/validator?text=body+%7B+font-family%3A+%22Helvetica%22%2C+%22Univers%22%2C+%22Arial%22%2C+sans-serif+%7D&warning=1&profile=css3&usermedium=all Fixed (was an issue with the new verification of parameter numbers).