BeaconsThe 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.widely2018-04-122020-10-12https://w3c.github.io/beacon/beaconhttps://developer.mozilla.org/docs/Web/API/Navigator/sendBeaconapi.Navigator.sendBeaconhttps://nowyoucanuse.com/features--beacons.html