[lxtx]

You can. I've used WebRTC for multiplayer support in Quake 3 compiled to WebAssembly.

[fb03]

Do you have a link for that? Sounds super cool

[lxtx]

The forked ioquake3 is available at https://github.com/seemk/ioq3

However it's not trivial to get it working at the moment, will hopefully soon come back to this project and finish it :D