HTML5 and CSS3 - Is there a Web standards divergence?

[kgun]

At present I am reading the Sitepoint book - HTML5 & CSS3 for the real world:

http://www.sitepoint.com/books/htmlcss1/

In the section

"Would the real HTML5 spec please stand up"?

There I read that there is now an additional organization "the Web Hypertext Application Techonology Working Group" WHATWG that serves the living HTML standard, dropping the "5" found at http://www.whatwg.org/specs/web-apps...ork/multipage/ . It is called a "living standard" because it will be in constant development and will no longer be refered to using incremental updates.

The W3C's version of the standard can be found at :

http://dev.w3.org/html5/spec/Overview.html

So what is the difference between the W3C spec and that of WHATWG? Briefly the WHATWG version is a little more informal and experimental (and, some might argue more forward-thinking).

WHATWG was formed by a group of people from Apple, Mozilla and Opera.

Should you be worried that there are two versions of the spec?

In short, no.

What is your opinion?