Just run `python -m http.server 4000` inside the www directory! Seems to be working for me.

There should be a hosted demo at least. The web's big advantage is instant distribution with no installation on any platform. I think it's a shame to build using web tech and then throw away your biggest advantage by requiring platform-specific local installation.

there is indeed a web version like others mentions, I also provided a prebuild binaries for lots of os/arch at https://solcloud.itch.io/counter-strike-football (and anybody can open PR for more), for hosted webpage demo I can for sure hosted somewhere on public internet as can anybody else, so I will leave that as a optional exercise for a reader to host community server :)

I think most users will build from source or use provided pre-build binaries

No UDP in browser?

Not true anymore! Here's my port of Quake III with UDP multiplayer: https://thelongestyard.link/

It uses WebRTC DataChannel for UDP. The code is here: https://github.com/jdarpinian/ioq3