open a custom popup on browser window/tab close

<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
	<title>K3logics.com</title>
	<script>
		var mouseX = 0;
		var mouseY = 0;
		var popupCounter = 0;

		document.addEventListener("mousemove", function(e) {
			mouseX = e.clientX;
			mouseY = e.clientY;
			document.getElementById("coordinates").innerHTML = "<br />X: " + e.clientX + "px<br />Y: " + e.clientY + "px";
		});

		$(document).mouseleave(function () {
			if (mouseY < 100) {
				if (popupCounter < 1) {
					alert("Please do not close the tab!");
				}
				popupCounter ++;
			}
		});

	</script>
</head>
<body>
	<div id="page-wrap">
		<span id="coordinates"></span>	
		<h1>Hi, Move your mouse cursor around then try to close the window of browser! - <a href="https://www.k3logics.com" target="_blank">https://www.k3logics.com</a></h1>
	</div>
</body>
</html>

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