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When using window.onbeforeunload (or $(window).on("beforeunload")), is it possible to display a custom message in that popup?
Maybe a small trick that works on major browsers?
By looking at existing answers I have the feeling this was possible in the past using things like confirm or alert or event.returnValue, but now it seems they are not working anymore.
So, how to display a custom message in the beforeunload popup? Is that even/still possible?
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