I know how important it is to comply with W3C XHTML and CSS standards for this theme.
Most designers find it troublesome to comply with W3C standards. Their main concern is to make the themes look good but ignore the importance of W3C compliance. I not only make sure this theme look nice in all major browsers (IE, Firefox, Safari, Opera, Chrome), but it is also checked for W3C compliance before it is launched.
You can verify it using the validators below:
XHTML Validation
CSS Validation