Searching for Body Onunload Browser Support information? Find all needed info by using official links provided below.
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://html.com/attributes/body-onunload/
body event handlers act on the browser window, so the onUnload is commonly used to bring up JavaScript alert when the visitor exits a website. Some visitors may find this behavior unhelpful, so it's best used sparingly.
https://stackoverflow.com/questions/7527969/detecting-browsers-that-dont-support-onunload-onbeforeunload
Of all the browsers, it seems that only Opera doesn't support onunload/onbeforeunload events. (It's been fifteen years now, Opera!) Solutions for this issue have been covered many times, here for example: onbeforeunload support detection Unfortunately, as of Opera 11.51, ("onbeforeunload" in window) == true, but the actual onbeforeunload event is never executed!
https://www.w3schools.com/tags/ev_onunload.asp
The onunload attribute fires 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: If you reload a page, you will also trigger the onunload event (and the onload event).
https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onunload
The onunload property of the WindowEventHandlers mixin is the EventHandler for processing unload events. These events fire when the window is unloading its content and resources. The resource removal is processed after the unload event occurs.
https://www.sitepoint.com/community/t/onunload-not-working-for-me/28877
Aug 30, 2014 · As stated before, it won't really be possible to implement this in a cross-browser fashion, due primarily to support for onunload events varying between browsers.
https://developer.mozilla.org/en-US/docs/Web/API/Window/unload_event
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http://w3schools.invisionzone.com/topic/48418-why-onunload-does-not-work/
Sep 04, 2013 · Hey guys, I have a small problem here the onunload event does not work on my firefox...don't know why. this was the example i tried to run on my browser it's from w3schools
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_onpagehide.asp
There are several ways to navigate away from a page. E.g. by clicking on a link, refreshing the page, submitting a form, closing the browser window, etc. The onpagehide event is sometimes used instead of the onunload event, as the onunload event causes the page to not be cached.
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