Following action will perform if one want to close tab or browser:

<script type=”text/javascript”>

window.onbeforeunload = WindowCloseHanlder;
function WindowCloseHanlder()
{

window.alert(‘Want ot close’);

}

</script>

Following event will close the browser or tab automatically without any prompt to get permission.

<script type=”text/javascript”>

window.open(”, ‘_self’, ”);
window.close();

</script>

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