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https://stackoverflow.com/questions/158673/onbeforeunload-support-detection
I wrote about a more-or-less reliable inference for detecting event support in modern browsers some time ago. You can see on a demo page that "beforeunload" is supported in at least Safari 4+, FF3.x+ and IE. Edit: This technique is now used in jQuery, Prototype.js, Modernizr, and likely other scripts and libraries.
https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onbeforeunload
The onbeforeunload property of the WindowEventHandlers mixin is the EventHandler for processing beforeunload events. These events fire when a window is about to unload its resources. At this point, the document is still visible and the event is still cancelable.
https://www.w3schools.com/jsref/event_onbeforeunload.asp
The onbeforeunload event occurs when the document is about to be unloaded. This event allows you to display a message in a confirmation dialog box to inform the user whether he/she wants to stay or leave the current page. The default message that appears in …
https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event
Event: Event handler property: onbeforeunload: This event enables a web page to trigger a confirmation dialog asking the user if they really want to leave the page. If the user confirms, the browser navigates to the new page, otherwise it cancels the navigation. ... Expect poor cross-browser support. Deprecated. Not for use in new websites ...
http://help.dottoro.com/ljhtbtum.php
Note that event listeners cannot be registered for the onbeforeunload event with the addEventListener and attachEvent methods (only Safari and Google Chrome support it). For a cross-browser solution, register the event handler in HTML (with the onbeforeunload attribute of the body element) or with the onbeforeunload inline event property of the ...
https://www.w3schools.com/Tags/ev_onbeforeunload.asp
The onbeforeunload event fires when the document is about to be unloaded. This event allows you to display a message in a confirmation dialog box to inform the user whether he/she wants to stay or leave the current page. The default message that appears in …
https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onunload
The resource removal is processed after the unload event occurs. ... WindowEventHandlers.onunload. Web technology for developers. ... using this event handler in your page prevents the browser from caching the page in the in-memory bfcache. See Using Firefox 1.5 caching for details.
https://www.w3schools.com/jsref/event_onunload.asp
The onunload event occurs once a page has unloaded (or the browser window has been closed). onunload occurs when the user navigates away from the page (by clicking on a link, submitting a form, closing the browser window, etc.). Note: The onunload event is also triggered when a user reloads the page (and the onload event).
https://www.zachleat.com/web/dont-let-the-door-hit-you-onunload-and-onbeforeunload/
Apr 22, 2008 · What’s worse, Opera never fires the onbeforeunload event. This creates a serious problem with attempting to save page state prior to a user leaving your page. Browser support aside, I believe that the onbeforeunload prompt is not an ideal way to protect the user from lost work (or unsaved page state).
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