HTML5 + CSS3 + jQuery = Awesome
As a state-of-the-art DNN skin, I have an HTML5 doctype, some CSS3 styles, and just a couple of custom jQuery functions to make my flyout sub-menus look and behave stylish.
However, due to some meta tags and other code baked into the DNN source code, I don't fully validate as an HTML5 document. This doesn't affect my compliance with WAI or WCAG, but I'm all about full disclosure.
If 100% validation is an absolute requirement, feel free to change me back to an XHTML 1.0 Transitional doctype. It won't hurt my feelings, I promise.