The plugin page, designed to test whether your web browser supports WebGL and 3D graphics. If you see a spinning box, your browser is a good candidate for WebGL! You should also be able to click on links to the company-maintained web pages for WebGL, administered by Khronos.
An online textbook by Dr. C Wayne Brown of the US Air Force Academy. Produced by Runestone Interactive.
Interactive 3D Graphics by Autodesk