Originally Posted by Kinetic And what about HTML 5 and old browsers like ie7/8 how will page be displayed in such browsers?

with any new new mark up language there are going to be a lot of browser compatibility issues in the beginning. I do code in css3 and html5 but only to test and play with because no matter what right now it's not really worth coding in html5 as for many IE users that dont update their browsers and they don't get to experience new features. So for right now it's better to stick to xhtml and css, some css3 is acceptable so those people that DO have updated browsers can see the rounded corners and the shadow text and div shadows.