I've been doing HTML since its infancy and have only recently started playing around with HTML5. I see some things that look pretty cool, but is there something (as with Java) that can show you the distinct differences between the old HTML4 and HTML5? I'm especially interested in being able to have the pages provide the same information regardless of platform or browser (this is important because it's pretty annoying for everyone when an app or site works perfectly on one browser or platform but looks horrid or just plain doesn't work on another). Thanks. And I'm checking out the playn you recommended to another user. I love Google.