For fun, you could even use redbean ( https://justine.lol/redbean/index.html ), which has been discussed on here recently. That would give you a tiny executable running a webserver that serves your webapp locally. Probably not much advantage compared to a plain html file, though. Might be smaller overall, since everything would be compressed.

That’s an interesting idea - you could even imagine an “Electron without the networking” so you wouldn’t have to take the whole computer offline.