> mostly means WebSockets these days
And some WebRTC. Sub-100 ms latencies. 200? Voice and video chat, and gaming. npm's Primus. PubNub.
>> As a web developer for over a decade, I don't recall seeing a web framework described with that before and have no idea how to interpret it.
'Realtime web' has been a phrase for a decade-ish - used to be server push. Google is fruitful; the Wikipedia article... needs help.
https://github.com/socketio/socket.io/blob/5518f8cb2c4125128...
https://robots.thoughtbot.com/real-time-online-activity-moni...
https://groups.google.com/d/msg/nodejs/1Bla2JHc3f0/N3fpKe7dY...
Another thing to keep in mind is that the precursor SSJS environments like Jack/Narwhal, Helma etc probably added it even earlier. Hard to tell since GitHub itself was new and many of these sources are hard to find today.