There is improved HTML5/CSS3 usage in WD version 9, Frank. This will of course make it to DP9.

Web Designer 9 automatically makes use of HTML5 whenever it can, so you get a state of the art website without having to do anything or understand anything about HTML! In v9 we ensure that your graphics are exported in the best format for current browsers (shapes such as rectangles, rounded rectangles with grad fills and transparency, shadows, text with shadows and page backgrounds, are displayed using native HTML not memory hungry PNGs) . It’s more efficient, and that means your site will be faster.

Your site will of course still work with older browsers.