I've never understood why they couldn't have just used the existing 3D CSS for WebXR. All the data is there, all they need to do is render the DOM from 2 POVs,

I've never understood why they couldn't have just used the existing 3D CSS for WebXR. All the data is there, all they need to do is render the DOM from 2 POVs, one for each eye. They could even have had some standard to let it auto composite with WebGL.