You haven't clarified you mean by "valid", valid to who/what? what is classified as valid? Valid to W3C CSS Validator, no since you answered that yourself. Val

You haven't clarified you mean by "valid", valid to who/what? what is classified as valid? Valid to W3C CSS Validator, no since you answered that yourself. Valid to W3C HTML Validator, yes, you also answered that yourself. Valid to browsers, yes, you also answered that yourself.