Problem with 'beforeunload' event in IE 10 browser

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ASP.NET

jQuery

IE10

Hi all,

I am having a problem with beforeunload event in IE10 browser,
The problem is when I am in IE10 it gives same X,Y coordinates for each postback , so I am not able to trap whether user is trying to close the browser or not.

This is code snippet:

window.onbeforeunload = confirmExit;
function confirmExit() {
if (!e) var e = window.event;
{
  if (((e.clientX || e.clientX) < 0) || ((e.clientY || e.clientY) < 0))//close button
  {
    return "You are about to close the browser";
  }
  else if (e.altKey == true || e.ctrlKey == true) // ALT + F4
  {
    return "You are about to close the browser";
  }
}
}

Can anyone help on this?

Thanks,
Pratik J