I'm curious to know where Safari stands in that regard: how much and how often does it "call home"?
Oh, and also : how much of it is Open Source? In my experience, Apple is particularly good at OpenSourcing lots of pieces while keeping the juicy bits proprietary. Can Safari be 100% rebuilt from source?
I think Chromium is to Chrome as Webkit is to Safari. The latter have proprietary code on top of the open-source former.
Webkit and blink are browser engines and Chromium/Chrome are both browsers, but Chromium doesn't include the closed source pieces that Chrome does.
Petty sure Webkit is also a browser you can build and run, like Chromium.
You might be confused by Apple calling its nightly Safari builds "WebKit technical preview" or whatever. It (used to) show up as "WebKit.app", but it's literally Apple Safari.
Probably that, yes.
yes, that's exactly what I said
No. WebKit (the browser engine that Safari uses) is open but the browser UI is not.