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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<head>
<script>
var w;
function openwindow() {
  w = window.open('','', 'width=100,height=100');
  w.focus();
}
function myFunction() {
  w.resizeBy(50, 50);
  w.focus();
}
</script>
</head>
<body>
<button onclick="openwindow()">Create window</button>
<button onclick="myFunction()">Resize window</button>
</body>
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_dom_window_resizeby by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:41:14 GMT -->
</html>
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