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those were my thoughts too

You can use Broadcast Channels as well as Service Workers, even WebRTC would use a loopback interface!

This ought to work across different browsers though, for what it's worth. But ultimately it's just a fun experiment.

I might be wrong, but I think the point is to simulate a server-client architecture (to show that it works even for an actual web app).

It says so right in the OP

> The original work by Bjorn Staal used localStorage, but I found sockets more fun, because if tweaked a bit, this can be shared with friends.