Part IV — The Reach
9 Offline Support
GoalMake the app usable when the network isn't, and sync cleanly when it returns.
- 9.1 Service Workers A background script that survives your page, proxies its requests, and updates on its own schedule.
- 9.2 Progressive Web Applications (PWAs) A website that installs, launches from the home screen, works offline, and receives push.
Capstone
Design an offline-first note app: cache strategy, write queue, sync watermark, and the conflict rule you'd defend.