James Friend is the one who got the C compiled with Emscripten, and as long as you're able to serve an entire disk image from a server (and don't crumble under the bandwidth), a browser is good enough.

Electron is only here to ensure that state is saved (save a game, quit the app, start the app, your save game is still there) and to make the mounting of disk images and transfer of files from your local machine super easy.