Yes, but in a browser ! :p

It reminds me the quote: "Everything that can be implemented in javascript will be implemented in javascript." And this implementation is actually pretty neat.

A modem _implemented in a browser_ for any device with a microphone and speaker (and browser), yes.

I'm really enjoying trying to think of good use cases for this, tbh

A PWA that picks up and beacons that emit local area "off-internet" websites wherever you go?

I was thinking along similar lines. A neighborhood sneaker-net backed by something like gun https://github.com/amark/gun

THIS WOULD BE SO COOL!!!!!! please email me :D :D :D