PWA quiz

Test your PWA knowledge with a free interactive quiz — 50 questions with answers and explanations. No signup needed to play.

A PWA wants to show "You are offline" when navigation fails. How?

1. A PWA wants to show "You are offline" when navigation fails. How?
2. Which manifest field controls how the app appears when launched from the home screen?
3. Which file declares PWA install metadata?
4. What event lets you intercept network requests inside a Service Worker?
5. A SW serves a stale response from the cache while updating in the background — which strategy is this?
6. What does the `purpose: "maskable"` icon hint allow?
7. What does `clients.claim()` do?
8. Which caching strategy fits hashed static assets (e.g. `/_next/static/[hash].js`)?
9. Which lifecycle event is the right place to clean up old caches?
10. What is the difference between Cache API and IndexedDB?
11. How can a page check if it is running as an installed PWA?
12. Which API stores arbitrary key→Response pairs that the SW can use?

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