Ctrl-W is fixed in fullscreen, and WebRTC DataChannel provides UDP (both client-server and peer-to-peer). Check my port of Quake III: https://github.com/jdarpinian/ioq3, you can test UDP multiplayer and Ctrl-W live in your browser here: https://thelongestyard.link/
I am fox on fire so Ctrl-W is tab close for me :) but yeah, there are ways (hacks) to make it run in web browser "natively" but only to some extend, I mean you can for sure rebind ctrl-w and other stuff or use chromium, but for me currently real LAN party is playing on electron :) web browser version is for testing and developing (for me at least)
