What do you mean "use GPU acceleration"? Are you saying that a large percentage of sites use WebGL? Using GPU acceleration for web page rendering is just a browser performance optimization. They can render the same page without GPU only slower.

I'm more specifically talking about WebGL. We'd love to use headless chrome at our company but we can't. But even for things like CSS transforms, we do a lot of really heavy 3D work and software emulation won't cut it.

CSS transforms work just fine without the GPU. We use it extensively for screenshot testing our CSS transform-based animations on https://oddslingers.com.

We are using a ton of them to create 3D heads up display camera overlays. They are too slow with GL software rendering.

Not sure what you mean? Usually people use either CSS 3D Transforms or WebGL, but not both.

What do you mean? We are using both right now. Why can't they both be used on the same page?

I think you're confusing WebGL (explicit GPU usage) and how GPU is used to implement CSS transforms (transparent, implicit GPU usage).

No, I'm not. We are using both a webgl context to render 3d objects on the screen using shaders, and 3D CSS transforms to render overlays on a video stream.

Ok you are. But most web sites are not.