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.


mySyncManager = ServiceWorker.sync


A SyncManager object.


Specification Status Comment
Web Background Synchronization Living Standard Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 49.0 ?[1] ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support No support ? ? ? ? ? 49.0

[1] Service workers (and Push) have been disabled in the Firefox 45 Extended Support Release (ESR.)

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, jpmedley, AlexPl
 Last updated by: chrisdavidmills,