Why? I hope the reason for this post was just to show off his CSS skills and not to suggest that Logos be made this way. It's the wrong tool for the job. Not to

Why? I hope the reason for this post was just to show off his CSS skills and not to suggest that Logos be made this way. It's the wrong tool for the job. Not to mention terrible browser interoperability. As many others have pointed out, these logos are all busted on IE <= 9 and most mobile browsers.