Valid XHTML & CSS really helps ensure a Wordpress theme is going to display accurately across different browsers. So, as expected from a quality Wordpress theme, the Cutline Mod Wordpress Theme validates to XHTML 1.0 Transitional and CSS 2.1.

I went ahead and used Transitional as the standard because Strict is a bit too, well, strict. Once people make the changes they like to make to personalize the theme as their own, that Strict validation will go right out the window. Transitional allows a little more leeway for those who care about their themes validating so they can make some changes without worrying about throwing the whole validation thing out the window.