Browser/tab close detection using javascript (or any other language)

Question

I searched for this question in various places, but all that they mention is the use of javascript window.unload & window.onbeforeunload. Also it doesn\'t

Answer 1

I tested and the example posted on MDN works clearly in Chrome.

...

   
...

This way a dialog opens that will not be blocked by a popup blocker as it is originated from a user click.