The site that I've chosen is Smashing Magazine. Progressive enhancement is a powerful method to build the best website while balancing the issues inherent by multiple unkown user-agents. It needed improve the users experience. No, I don't get a valid code. I get 26 warnings and errors on the main page. I check the CSS page and the HTML code isn't validate. I get 17 warning and errors on the CSS webpage. I would get the design a 9.5. It design has a lot that really stick out in a good way. For usability I would give it a 10 out of 10, for scolling and everything just pops out. I believe that this webpage has made it for its purpose