<!DOCTYPE html>
<html>
<head>
<script>
var myWindow;
function openWin() {
myWindow = window.open("", "", "width=400, height=200");
}
function closeWin() {
myWindow.close();
}
</script>
</head>
<body>
<input type="button" value="Open 'myWindow'" onclick="openWin()" />
<input type="button" value="Close 'myWindow'" onclick="closeWin()" />
</body>
</html>