What are the best guides to HTML5 & CSS3 support in web browsers?

Question

Do you know about useful resources about HTML5 & CSS3?

UPDATE:

I'm (and i think a lot of people) looking for pracitcal information how and to what extent is it possible to use these unfinished technologies. I found one very useful resource:

http://caniuse.com/

Answer 1

As far as HTML5 goes, I frequently check out:

• http://html5doctor.com
• http://diveintohtml5.org/

And yes, the HTML5 spec, which I recently visited to find out more about supported input types and form field attributes in HTML5:

• http://dev.w3.org/html5/spec/Overview.html
• http://dev.w3.org/html5/spec/Overview.html#forms

As for CSS3, I often find myself at:

• http://www.css3.info/

Safari reference material, which may or may not be HTML5/CSS3 specific:

• http://developer.apple.com/safari/library/documentation/AppleApplications/Reference/SafariCSSRef/Introduction.html
• http://developer.apple.com/safari/library/documentation/AppleApplications/Reference/SafariHTMLRef/Introduction.html

Answer 2

You can also take a look at HTML5 Laboratory which is my own HTML5 experiment site.

As mentioned above, HTML5 Doctor and Dive into HTML5 are two great resources.