mattur - 3:55 pm on May 13, 2011 (gmt 0)
[diveintohtml5.org...] is an excellent introduction covering the new features in HTML5 as well as how to detect support for them. Highly recommended.
The nasty thing about html5 is that they've dispensed with the dtd
Browsers use the same "HTML" parser to parse all text/html pages, including pages with HTML2, HTML3.2, HTML4, XHTML1 doctypes.
The only thing browsers have ever used the doctype declaration for is to switch between quirks and standards modes. More info on the WHATWG FAQ: