I'm just asking random questions now and then to get an idea of how things work in the web world. Especially those that aren't mentioned in tutorials.

Which is a good thing :) I am all in for asking questions. If someone can't answer them, it usually means they have not thought about it and are either ignorant or will learn something themselves :D

(like me for your question, as I never tried TabSub with internet disconnected. Was delighted to see it works nevertheless)

But but, you used "offline". I always thought that's the opposite of "online". Looks like it means something else in Newspeak :)