ServiceWorkerRegistration: sync property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
The sync read-only property of the ServiceWorkerRegistration interface returns a reference to the SyncManager interface, which manages background synchronization processes.