I hope your sitting down as this might come as a bit of a shock but lots of live content is streamed via "web pages", like sports for example.

I'm aware of that. This would make a little more sense if it was specifically about video, or maybe audio. Is... that what it is?

It says "Grabs the broadcast stream", I think it's suggesting using Jellyfin as a redistribution node for a piece of licenced content (sports games, films etc)