You're far better off just using HTML5 WebGL. The reason is that the video card manufacturers like Nvidia are already supporting 3d through their graphics hard

You're far better off just using HTML5 WebGL. The reason is that the video card manufacturers like Nvidia are already supporting 3d through their graphics hardware. It makes no sense to try to support every possible hardware combination. From a hardware point of view, it's very easy to transform 3d rendered objects into stereoscopic images rather than displaying them on a 2d surface. This is why manufacturers like Nvidia can already support many games in full 3d right out of the box. Just use WebGL and your app will support native 3d as soon as the drivers improve to support it, provided your audience has the appropriate 3d hardware.