[greggman65]

If you just want it to work, stick this script on your page

https://github.com/greggman/virtual-webgl

If you want to make your own solution there's one listed here about 1/2 way down the page

https://webglfundamentals.org/webgl/lessons/webgl-multiple-v...

As an aside, WebGPU doesn't have this issue or at least has it less. For one, WebGPU can use a single device to render to multiple canvases, something WebGL can't. Another is that WebGPU is mostly stateless making it easier for both the user and the browser.

[ux]

Incredible, thank you very much. I've included the script for a quick fix, I'll see how to make to cook something myself at some point!