midPWA
What is Background Sync in PWAs?
Updated May 17, 2026
Short answer
It allows deferred actions when connectivity returns.
Deep explanation
Background Sync queues failed network requests and retries them automatically when the network is available.
Real-world example
Messaging apps sending messages offline.
Common mistakes
- Not handling sync failures.
Follow-up questions
- Does it work on all browsers?
- What triggers sync?