If you just want it to work, stick this script on your page https://github.com/greggman/virtual-webgl https://github.com/greggman/virtual-webgl If you want to

If you just want it to work, stick this script on your page https://github.com/greggman/virtual-webgl 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-views.html 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.