WindowEventHandlers.onrejectionhandled

The onrejectionhandled property of the WindowEventHandlers mixin is the EventHandler for processing rejectionhandled events. These events are raised when Promises are rejected.

Syntax

window.addEventListener("rejectionhandled", function(event) { ... });
window.onrejectionhandled = function(event) { ...};

window.onrejectionhandled = function(e) {
  console.log(e.reason);
}

Specification	Status	Comment
HTML Living Standard The definition of 'onrejectionhandled' in that specification.	Living Standard	Initial definition.

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`onrejectionhandled`	Chrome Full support 49	Edge ?	Firefox Partial support 55 Notes Disabled Partial support 55 Notes Disabled Notes Firefox doesn't yet send the unhandledrejection or understand rejectionhandled events. Completing the implementation will be addressed in bug 1362272. Disabled From version 55: this feature is behind the `dom.promise_rejection_events.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	IE No support No	Opera Full support 36	Safari Full support 11	WebView Android Full support 49	Chrome Android Full support 49	Edge Mobile ?	Firefox Android Partial support 55 Notes Disabled Partial support 55 Notes Disabled Notes Firefox doesn't yet send the unhandledrejection or understand rejectionhandled events. Completing the implementation will be addressed in bug 1362272. Disabled From version 55: this feature is behind the `dom.promise_rejection_events.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	Opera Android No support No	Safari iOS Full support 11.3	Samsung Internet Android ?

Full support: Full support
Partial support: Partial support
No support: No support
Compatibility unknown: Compatibility unknown
See implementation notes.: See implementation notes.
User must explicitly enable this feature.: User must explicitly enable this feature.