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<!DOCTYPE html>
<html>
<head>
<script>
function openWin() {
  var myWindow = window.open("", "", "width=400, height=200");
  myWindow.opener.document.getElementById("demo").innerHTML = 
  "A new window has been opened.";
}
</script>
</head>
<body>
​
<button onclick="openWin()">Open myWindow</button>
​
<p id="demo"></p>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_win_opener by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:41:14 GMT -->
</html>
​
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