Detect browser close event

I want to capture the browser window/tab close event. I have tried the following But not working:

<script type="text/javascript">
window.onbeforeunload = function(){ myUnloadEvent(); }
function myUnloadEvent() {
    alert ('Calling some alert messages here');
}
</script>
<body>
Body of the page goes here.
</body>

Tried these links also but no more success.

javascript to check when the browser window is close
How to capture the browser window close event?
javascript detect browser close tab/close browser
Trying to detect browser close event

Problem :

I just want to detect the browser close event and do some handling on that without showing the prompt to the user.

I have tried many methods to detect browser close event through jQuery or JavaScript. But unfortunately I could not succeed. The onbeforeunload and onunload methods are also not working.

Any help will be highly appreciated. Thanks


Source: cross-browser

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