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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<head>
<script>
var myWindow;
function openWin() {
  myWindow = window.open("", "myWindow", "width=400, height=200");
}
function closeWin() {
  if (myWindow) {
    myWindow.close();
  }
}
function checkWin() {
  if (!myWindow) {
    document.getElementById("msg").innerHTML = "'myWindow' has never been opened!";
  } else {
    if (myWindow.closed) { 
      document.getElementById("msg").innerHTML = "'myWindow' has been closed!";
    } else {
      document.getElementById("msg").innerHTML = "'myWindow' has not been closed!";
    }
  }
}
</script>
</head>
<body>
<button onclick="openWin()">Open "myWindow"</button>
<button onclick="closeWin()">Close "myWindow"</button>
<br><br>
<button onclick="checkWin()">Has "myWindow" been closed?</button>
<br><br>
<div id="msg"></div>
</body>
</html>
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