Well, it's been in the 12.00 alpha for a few weeks, now. Maybe a couple of months. They actually planned to have it in 11.50 but postponed it to 12.00 probably because it was a 'big' feature.
WebGL objects are shown on a canvas, AFAIK. You could easily get away with creating a software surface for the page itself, and have a canvas surface that's rendered through Direct3D, OpenGL or whatever. Just like OpenGL has always worked in regular Windows windows (sure..), i.e. software GDI mixed with hardware surface for OpenGL. At least that was the case back in 1999, I see no reason why this would have changed...





