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Java Script: Closing child window or tab on parent window ...
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onunload Event - W3Schools
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 ...
HTML onunload Event Attribute - W3Schools
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 ...
WindowEventHandlers.onunload - Web APIs | MDN
Summary. The unload event is raised when the window is unloading its content and resources. The resources removal is processed after the unload event occurs.. Syntax window.onunload = funcRef; funcRef is a reference to a function.; Notes. Using this event handler in your page prevents Firefox 1.5 from caching the page in the in-memory bfcache.
WindowEventHandlers.onbeforeunload - Web APIs | MDN
The WindowEventHandlers.onbeforeunload event handler property contains the code executed when the beforeunload is sent. This event fires when a window is about to unload its resources. The document is still visible and the event is still cancelable.
onload Event - W3Schools
The onload event can be used to check the visitor's browser type and browser version, and load the proper version of the web page based on the information. The onload event can also be used to deal with cookies (see "More Examples" below).
The onunload event won't fire if the onload event did not fire. Unfortunately the onload event waits for all binary content (e.g. images) to load, and inline scripts run before the onload event fires. DOMContentLoaded fires when the page is visible, before onload does. And it is now standard in HTML 5, and you can test for browser support but note this requires the <!DOCTYPE html> (at least in ...
The link you shared to support the statement that onunload doesn't work in firefox, is meant when the page is in a popup situation only. "window.onUnload don't work when the page is in a popup" – Nick Rolando Apr 19 at 20:54
It could be that because the page has already started unloading by the time that the onunload event is triggered that the page finishes unloading before the alert gets displayed.