With HTML5 support coming so fast, with the tiniest of hacks we are able to use it today in virtually al browsers. Using HTML5 makes for much cleaner mark up. This framework fully uses all the great advantages of HTML5.
CSS3 is one of the coolest thing in the web designer world and has been a long time coming. With CSS3 you can save time designing and slicing fancy layouts. CSS3 has features like text/box shadow, rounded corners,and animations. These just a few of the many CSS3 features has to offer you.