<!DOCTYPE html>
<html>
<head>
<title>
Centered popup window
on the screen
</title>
</head>
<body>
<h1>GeeksforGeeks</h1>
<p>
Centered popup window
on the screen
</p>
<script>
function createPopupWin(pageURL, pageTitle,
popupWinWidth, popupWinHeight) {
var left = (screen.width - popupWinWidth) / 2;
var top = (screen.height - popupWinHeight) / 4;
var myWindow = window.open(pageURL, pageTitle,
'resizable=yes, width=' + popupWinWidth
+ ', height=' + popupWinHeight + ', top='
+ top + ', left=' + left);
}
</script>
<button onclick = "createPopupWin('https://www.geeksforgeeks.org',
'GeeksforGeeks Website', 1200, 650);">
GeeksforGeeks
</button>
</body>
</html>