Free HTML5 Templates are just what they sound like: free web templates using valid HTML5 code. Some of the templates may also include CSS3 code as well, but those will be clearly tagged, and because CSS3 is still evolving and is highly dependent upon browser vendor implementations, the CSS may not always validate.
The goal, of course, is to help you use the newest, most modern template code available. As the HTML 5 standard evolves, we’ll evolve with it.
Via Gust MEES