ServiceWorkerRegistration.sync

Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The sync property of the ServiceWorkerRegistration interface returns a reference to the SyncManager interface, which manages background synchronization processes.

Syntax

mySyncManager = ServiceWorker.sync

Value

A SyncManager object.

Specifications

Specification Status Comment
Web Background Synchronization Living Standard Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 49Edge Full support 17
Full support 17
Full support 16
Disabled
Disabled From version 16: this feature is behind the Enable service workers preference.
Firefox Full support 44
Notes
Full support 44
Notes
Notes Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR).
IE No support NoOpera Full support 36Safari Full support 11.1WebView Android Full support 45
Notes
Full support 45
Notes
Notes Starting with Chrome 46, update() returns a promise that resolves with 'undefined' if the operation completed successfully or there was no update, and rejects if update failed. If the new worker ran but installation failed, the promise still resolves. Formerly, it raised an exception.
Notes Before Chrome 48, this method always bypassed the browser cache. Starting with Chrome 48, it only bypasses the cache when the previous service worker check was more than twenty-four hours ago.
Chrome Android Full support 49Edge Mobile ? Firefox Android Full support 44Opera Android Full support 36Safari iOS Full support 11.1Samsung Internet Android Full support 4.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

Document Tags and Contributors

Contributors to this page: ExE-Boss, abbycar, chrisdavidmills, jpmedley, AlexPl
Last updated by: ExE-Boss,