<!DOCTYPE html>
<html>
<body>
<p>Click the button to open a new window and close the window after three seconds (3000 milliseconds)</p>
<button onclick="openWin()">Open "myWindow"</button>
<script>
function openWin() {
var myWindow = window.open("", "myWindow", "width=200, height=100");
myWindow.document.write("<p>This is 'myWindow'</p>");
setTimeout(function(){ myWindow.close() }, 3000);
}
</script>
</body>
</html>