I'm playing around with Smart and Penman to see if I can use it to display some experiments as I learn WebGL. Looks good so far.
What you might see below (if you are using a Firefox Nightly Build, and you have set webgl.enabled_for_all_sites to true in about:config), is an embedded iframe with a simple WebGL demo in it.
My knowledge of WebGL is not developed yet - I got the source for the black triangle from this helpful blog post. Hopefully it's OK that I just copied it, there wasn't a license file -- I added some attribution and I can remove it if it's a problem.
If you don't see anything above, WebGL probably isn't working in your browser.
I currently can't find much in the way of documentation on WebGL on the web. But I do own several OpenGL books, and I've long been wanting to learn it. Hopefully, WebGL stays fairly close to OpenGL, and I can figure it out. I'll post my learning experiments here, and on GitHub.