[mananaysiempre]

Huh? There has been chat in the Gmail web interface since before Google defederated from Jabber, although I believe it didn’t have notifications aside from changing the window title, for lack of browser APIs at the time.

[trissylegs]

Wait no. I'm thinking the other way around. It was chat could enable notifications for hangouts.google.com. But when it moved to mail.google.com now allowing chat notifications allows mail notifications, which I didn't want.