that's the realm of service workers, and they allow you to define how your app handles resources when offline. it also helps with push notifications, but doesn't really open native device capabilities outside what's already available (ie, you may still need native app for accessing bluetooth).

i haven’t read it in a long time, but i think just experimenting with macros, and really writing something with them is the way to learn. i wrote my most complicated macro in the last year and learned a lot.

started with emacs lisp in the early 90's, and after reading graham's "on lisp" moved on to common lisp in college. i've experimented with other languages over the years, but some form of lisp is always there. and that's been clojure for me that last 10 years.

i don’t see parens, just an implied structure of data and code.