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<!DOCTYPE html>
<html>
<body>
​
<p>Open a new window, and decrease the new window's width by 50px, and increase the height by 50px.</p>
<p><b>Tip:</b> Click the "Resize window" button multiple times.</p>
​
<button onclick="openWin()">Create window</button>
<button onclick="resizeWin()">Resize window</button>
​
<script>
var myWindow;
​
function openWin() {
  myWindow = window.open("", "", "width=500, height=500");
}
​
function resizeWin() {
  myWindow.resizeBy(-50, 50);
  myWindow.focus();
}
</script>
​
</body>
​
</html>
​
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