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WindowEventHandlers

The WindowEventHandlers mixin describes the event handlers common to several interfaces like Window, or HTMLBodyElement and HTMLFrameSetElement. Each of these interfaces can implement additional specific event handlers.

Note: WindowEventHandlers is a mixin and not an interface; you can't actually create an object of type WindowEventHandlers.

Properties

The events properties, of the form onXYZ, are defined on the WindowEventHandlers, and implemented by Window, and WorkerGlobalScope for Web Workers.

WindowEventHandlers.onafterprint: Is an EventHandler representing the code to be called when the afterprint event is raised.
WindowEventHandlers.onbeforeprint: Is an EventHandler representing the code to be called when the beforeprint event is raised.
WindowEventHandlers.onbeforeunload: Is an EventHandler representing the code to be called when the beforeunload event is raised.
WindowEventHandlers.onhashchange: Is an EventHandler representing the code to be called when the hashchange event is raised.
WindowEventHandlers.onlanguagechange: Is an EventHandler representing the code to be called when the languagechange event is raised.
WindowEventHandlers.onmessage: Is an EventHandler representing the code to be called when the message event is raised.
WindowEventHandlers.onmessageerror: Is an EventHandler representing the code to be called when the MessageError event is raised.
WindowEventHandlers.onoffline: Is an EventHandler representing the code to be called when the offline event is raised.
WindowEventHandlers.ononline: Is an EventHandler representing the code to be called when the online event is raised.
WindowEventHandlers.onpagehide: Is an EventHandler representing the code to be called when the pagehide event is raised.
WindowEventHandlers.onpageshow: Is an EventHandler representing the code to be called when the pageshow event is raised.
WindowEventHandlers.onpopstate: Is an EventHandler representing the code to be called when the popstate event is raised.
WindowEventHandlers.onstorage: Is an EventHandler representing the code to be called when the storage event is raised.
WindowEventHandlers.onunhandledrejection: An event handler for unhandled Promise rejection events.
WindowEventHandlers.onunload: Is an EventHandler representing the code to be called when the unload event is raised.

Methods

This interface defines no method.

Specifications

Specification	Status	Comment
HTML Living Standard The definition of 'GlobalEventHandlers' in that specification.	Living Standard	No change since the latest snapshot, HTML 5.1.
HTML 5.1 The definition of 'GlobalEventHandlers' in that specification.	Recommendation	Snapshot of HTML Living Standard. Added `onlanguage` since the HTML5 snapshot.
HTML5 The definition of 'GlobalEventHandlers' in that specification.	Recommendation	Snapshot of HTML Living Standard. Creation of `WindowEventHandlers` (properties where on the target before it).

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	Yes	?	Yes	?	Yes	?
`onafterprint`	63	Yes	6	Yes	50	No
`onbeforeprint`	63	Yes	6	Yes	50	No
`onbeforeunload`	1	Yes	1	4	12	3
`onhashchange`	5	Yes	3.6	8	10	5
`onlanguagechange`	37	?	32	No	24	?
`onmessage`	60	?	?	?	47	?
`onmessageerror`	60	?	57	?	47	?
`onpopstate`	5	12	4	10	11.5	6
`onrejectionhandled`	49	?	No No Firefox implements the `PromiseRejectionEvent` interface if you go to about:config and set the `dom.promise_rejection_events.enabled` pref to `true`. However, Firefox doesn't yet actually send the `unhandledrejection` or understand `rejectionhandled` events. Completing the implementation will be addressed in bug 1362272.	No	No	No
`onstorage`	?	Yes	45	?	?	?
`onunhandledrejection`	49	Yes	No No Firefox implements the `PromiseRejectionEvent` interface if you go to about:config and set the `dom.promise_rejection_events.enabled` pref to `true`. However, Firefox doesn't yet actually send the `unhandledrejection` or understand `rejectionhandled` events. Completing the implementation will be addressed in bug 1362272.	No	No	No
`onunload`	Yes	Yes	Yes	Yes	Yes	Yes

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	Yes	Yes	?	Yes	Yes	?	?
`onafterprint`	63	63	Yes	?	50	?	?
`onbeforeprint`	63	63	Yes	?	50	?	?
`onbeforeunload`	Yes	Yes	Yes	?	Yes	No No Implementation seems defect.	?
`onhashchange`	Yes	Yes	Yes	4	11	5	?
`onlanguagechange`	37	37	?	4	24	?	?
`onmessage`	60	60	?	?	47	?	?
`onmessageerror`	60	60	?	57	47	?	?
`onpopstate`	?	18	?	4	12	5.1	?
`onrejectionhandled`	No	No	?	No No Firefox implements the `PromiseRejectionEvent` interface if you go to about:config and set the `dom.promise_rejection_events.enabled` pref to `true`. However, Firefox doesn't yet actually send the `unhandledrejection` or understand `rejectionhandled` events. Completing the implementation will be addressed in bug 1362272.	No	No	?
`onstorage`	No	No	Yes	45	?	?	?
`onunhandledrejection`	No	No	Yes	No No Firefox implements the `PromiseRejectionEvent` interface if you go to about:config and set the `dom.promise_rejection_events.enabled` pref to `true`. However, Firefox doesn't yet actually send the `unhandledrejection` or understand `rejectionhandled` events. Completing the implementation will be addressed in bug 1362272.	No	No	?
`onunload`	Yes	Yes	Yes	Yes	Yes	Yes	?

WindowEventHandlers

Properties

Methods

Specifications

Browser compatibilityUpdate compatibility data on GitHub

See also