PeriodicSyncEvent: tag property

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Note: This feature is only available in Service Workers.

The tag read-only property of the PeriodicSyncEvent interface returns the developer-defined identifier for the PeriodicSyncEvent. This is specified when calling the PeriodicSyncManager.register() method of the PeriodicSyncManager interface. Multiple tags can be used by the web app to run different periodic tasks at different frequencies.

Value

Returns a String of the defined identifier.

Examples

The following example demonstrates listening for a periodic sync event in the service worker, and accessing the tag property.

js
self.addEventListener("periodicsync", (event) => {
  console.log(event.tag); // logs the events tag
});

Specifications

Specification
Web Periodic Background Synchronization
# dom-periodicsyncevent-tag

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
tag
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also