Beacons

The navigator.sendBeacon() method asynchronously sends an HTTP POST request with a limited amount of data, typically for app state, events, and analytics data. The one-way beacon is guaranteed to be initiated before the browser unloads the page, but the sender does not get to handle the response.

Baseline Status: Achieved Widely Available on Oct 12, 2020 (Cross-browser Newly Available since Apr 12, 2018).

Desktop Browser Engine Support

Google Chrome

39

Supported

Mozilla Firefox

31

Supported

Apple Safari

11.1

Supported

Microsoft Edge

14

Supported

Mobile Browser Engine Support

Chrome Android

42

Firefox Android

31

Safari iOS

11.3

Specifications and References

Specification ↗ Can I Use (beacon) ↗ Feature XML ↗

MDN Browser Compat Data Keys:

api.Navigator.sendBeacon ↗