<!DOCTYPE html>
<html>
<body>
<button onclick="openWin()" id="open-button">Open "myWindow"</button>
<button onclick="closeWin()" id="close-button">Close "myWindow"</button>
<script>
var myWindow;
function openWin() {
myWindow = window.open("", "myWindow", "width=200, height=100");
}
function closeWin() {
myWindow.close();
myWindow.close();
}
</script>
</body>
</html>