What is the best online javascript/css/html/xhtml/dom reference? [closed]

Question

I'm a front-end developer and I was looking for opinions about the best all-round online documentation for javascript/css/html/xhtml/dom/browser quirks and support. I've tried Sitepoint, Quirksmode, W3Schools but all of these seem to be lacking in certain aspects and have been using them in combination.

Answer 1

I like Mozilla's references:

http://developer.mozilla.org/en/JavaScript

http://developer.mozilla.org/en/DOM

These are not at all the one stop site you want, but they help me.

Answer 2

I like gotapi.com (Update 2: Site is apparently offline -- Use another resource such as MDN)

Update: the original answer was from 2008 -- today I would say to check out Mozilla Developer Network (as many others have also said).