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.

Learning resources on MDN

• Navigator: sendBeacon() method

Browser support

• Chrome 39 Released on 2014-11-18
• Chrome Android 42 Released on 2015-04-15
• Edge 14 Released on 2016-08-02
• Firefox 31 Released on 2014-07-22
• Firefox for Android 31 Released on 2014-07-22
• Safari 11.1 Released on 2018-04-12
• Safari on iOS 11.3 Released on 2018-03-29

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