Is there a website where I can see which HTML 5 tags are supported in in different browsers? And WebGL?

Question

I want to make an HTML/Javascript web app. Is there a website where I can compare what webrowser already support the HTML 5 tags? And WebGL?

Answer 1

Yes, there are many. Here are a couple for each:
(HTML) http://a.deveria.com/caniuse/
(HTML) http://quirksmode.org/dom/html5.html
(WebGL) http://wakaba.c3.cx/w/webgl.html
(WebGL) http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation

Other posters' answers are also good.