Browswer differences

[Webskater]

Having had the luxury of developing Intranet apps for some time (for IE) I am now completely out of touch with what other browsers do and don't support. Anyone know of a site that shows comparisons so you can see at a glance what is supported and in what version etc. I am particularly interested in whether the two major browsers implement javascript the same and dhtml and css.
Thanks for any input.

[pyro]

If you use valid code, you won't have to worry about it as much -- just browser incapabilities, then...

http://www.w3.org/TR/html401/
http://www.w3.org/TR/CSS2/
http://www.w3.org/DOM/