<!DOCTYPE html>
<html lang="en-US">
<body>
<button onclick="myOpen()">Open Window</button>
<button onclick="myResizeBy()">ResizeBy Window</button>
<script>
var myWindow;
function myOpen(){
myWindow = window.open("","myWindow","width=100, height=150");
}
function myResizeBy(){
myWindow.resizeBy(50, 75);
myWindow.focus();
}
</script>
<p><strong>Note</strong>: Try to click 'ResizeBy Window' button more than once.</p> </body>
</html>