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https://api.jquery.com/unload/
The exact handling of the unload event has varied from version to version of browsers. For example, some versions of Firefox trigger the event when a link is followed, but not when the window is closed. In practical usage, behavior should be tested on all supported browsers and contrasted with the similar beforeunload event.
https://www.w3schools.com/jquery/event_unload.asp
CSS Reference CSS Browser Support CSS Selector Reference Bootstrap 3 Reference Bootstrap 4 Reference W3.CSS Reference Icon Reference Sass Reference. ... The unload() method was deprecated in jQuery version 1.8 and removed in version 3.0. The unload event occurs when the user navigates away from the page.
https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event
Attaching an event handler/listener to window or document's beforeunload event prevents browsers from using in-memory page navigation caches, like Firefox's Back-Forward cache or WebKit's Page Cache. The HTML specification states that calls to window.alert() , window.confirm() , and window.prompt() methods may be ignored during this event.
https://stackoverflow.com/questions/7389554/crossbrowser-onbeforeunload
It's my recollection that IE was the only browser to implement onbeforeunload, but some browsers have taken it upon themselves to implement it. Long story short, IE is about the only browser (with very finite exceptions) you'll find this event consistently in.
https://stackoverflow.com/questions/9638247/is-jquery-browser-deprecated
Since jQuery is plugin based, some developers opted to use $.browser and with the latest releases of jQuery which doesn't include $.browser all those plugins where rendered useless. jQuery did release a migration plugin , which was created for developers to detect whether their plugin's used any depreciated dependencies such as $.browser.
https://www.w3schools.com/jsref/event_onbeforeunload.asp
Definition and Usage. 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.
https://developer.mozilla.org/en-US/docs/Web/API/Window/unload_event
The unload event is fired when the document or a child resource is being unloaded.
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