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Currently, examples 12 - 16 in section 8.1 (http://www.w3.org/TR/css3-values/#calc-notation) of the CSS Level 3 Values specification appear to fail when inputted as direct input (with format set to CSS3) into the public instance of the validator at jigsaw.w3.org/css-validator.
Yes, attr works only partially (in color only) and calc does not work yet, progress has been made on that front, but no release date even for the alpha version.
This still hasn't been fixed, anyone know whats taking so long? calc() is listed in this CSS3 spec: http://www.w3.org/TR/css3-values/#calc