<!DOCTYPE html>
<html lang="en-US">
<body>
<button onclick="myOpen()">Open Window</button>
<button onclick="myFocus()">focus Window</button>
<button onclick="myBlur()">blur Window</button>
<script>
var myWindow;
function myOpen() {
myWindow = window.open("", "myWindow", "width=400, height=200");
myWindow.document.write("<p>A new window!</p>");
}
function myFocus(){
myWindow.focus();
}
function myBlur(){
myWindow.blur();
}
</script> </body>
</html>