Background Sync

Background Sync — Defer actions until the user has stable connectivity via the service worker.

Browser & ecosystem support

• Legend
• Yes
• Partial
• Flag
• No
• Unknown

Browser / Platform	Support	Versions	Confidence	Source	Notes
Chrome (Desktop)	Yes	49	high	source	—
Chrome (Android)	Yes	49	high	source	1
Edge (Desktop)	Yes	79	high	source	2
Firefox (Desktop)	No	—	high	source	3
Firefox (Android)	No	—	high	source	45
Safari (macOS)	No	—	high	source	6
Safari (iOS)	No	—	high	source	78
Samsung Internet	Yes	5.0	high	source	9
WebView (Android)	No	—	high	source	10

1. Derived by browser-compat-data mirroring from Chrome.
2. Derived by browser-compat-data mirroring from Chrome.
3. No Firefox support is recorded in browser-compat-data.
4. No Firefox for Android support is recorded in browser-compat-data.
5. Derived by browser-compat-data mirroring from Firefox.
6. Implementation tracking: https://webkit.org/b/182565.
7. Implementation tracking: https://webkit.org/b/182565.
8. Derived by browser-compat-data mirroring from Safari.
9. Derived by browser-compat-data mirroring from Chrome Android.
10. Implementation tracking: https://crbug.com/40449796.

Source data: /compatibility/background-sync.json · Global usage: 72 % (StatCounter 2026-05)

Source: spec · MDN · Last verified 2026-10-03 · Confidence: high (computed from sources)

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