Pop-up window that appears when leaving the site - show an example? Is it possible to make a poll in it?

Question

Online shopping

Can you send an example of a pop-up window that appears when you leave the site?

Answer 1

If the standard warning is

window.onbeforeunload = popup;

function popup() {
  return 'I see you are leaving the site';
}

Answer 2

It is possible to show only a pseudo-modal (via DIV) on moving the mouse out of the page. And already inside - you can do whatever you want.
You can combine: display a survey on mouse release and show a window on onbeforeunload: "Help us improve the site?" (Not really)