mattur - 6:13 pm on May 27, 2010 (gmt 0)

So basically I can start using HTML 5.0 and older browsers will still see it as valid tag soup?

Older browsers will see HTML5 as "HTML" - exactly the same way they see HTML4, HTML3.2, etc.

Browsers use a "HTML" parser for all HTML pages, and HTML5 describes for the first time how this "HTML" parser works (as well as extending it with new features). HTML5 is designed to be backwards compatible; it's based on how existing browsers work.