JavaScript Service_workers Guide
Service workers enable offline functionality, push notifications, and caching for Progressive Web Apps. The guide walks through Lifecycle & Caching. Register: `navigator.serviceWorker.register("/sw.js")`. Install: cache static assets. Activate: clean old caches. Fetch: intercept requests, serve from cache or network. Strategies: Cache First (static), Network First (API), Stale While Revalidate. Push: `self.addEventListener("push",e=>{})`. The guide is organized into 1 sections that build on each other, each pairing a prose explanation with runnable code. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page. Practice what you learn in the JavaScript playground, and look up any unfamiliar term in the JavaScript glossary.