I have successfully implemented a way to exit the page with a confirmation using window.onbeforeunload. However, I am curious about how I can customize the appearance of the exit confirmation box by adding CSS and HTML elements, instead of just displaying plain text that says "Are you sure you want to exit this page?"
Using the onbeforeunload event provides limited functionalities.
It aims to avoid JavaScript from capturing a user.
Regrettably, the dialog style cannot be altered.
You have the option to customize it to fit your needs, for example:
window.onbeforeunload = function() {
return 'You have unsaved changes!';
}
Explore the documentation related to this matter on MSDN
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