<!DOCTYPE html>
<html lang="en-US">
<body>
<button onclick="myOpen()">Open Window</button>
<button onclick="myClose()">Close Window</button>
<script>
var myWindow;
function myOpen(){
myWindow = window.open("", "myWindow", "width=400, height=200");
}
function myClose(){
myWindow.close();
}
</script> </body>
</html>