Offline First (#offline) was a session at IndieWeb Summit 2016.
Archived from notes: http://etherpad.indiewebcamp.com/offline
Kyle: Interested in offline first for Woodwind so can read when there's no connection.
airhorner.com: after visiting enough times the service worker promps to "add to home"
see ben.thatmustbe.me/mobilepub for an indieweb example - you log in wiht micropub if you'e offline, you can save posts for later, then post them when you're back online
also https://adactio.com/ both of these are indieweb sites that are PWAs. Jeremy caches pages so you can read offline
For a news reading site there is wapo.com/pwa which is a WaPo reader that embeds AMPpages and cacehs with a service worker
it will work on iOS, just not offline
Kyle used Ben's mobilepub, wrote a post offline, saved it, went back online and published (no interactive indication it published), but it did publish: https://kylewm.com/2016/06/testing-offline-posting-during-our-offline-first