KeyCode WebHat is able to generate W3C compatible pages since almost five years.
(this functionality was introduced on November 29th 2003).
However It is important to underline that even if WebHat is able to generate W3C compatible pages, the page compatibility depends entirely on the template developed.
In fact to be validated both code and template must be generated following the right criteria
Therefore KeyCode cannot guarantee that a website implemented with WebHat will be W3C compatible as the control on the pages code is made by Keycode's Partners.