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<!DOCTYPE html>
<html>
<head>
​
<script>
var myWindow;
function openWin() {
  myWindow = window.open("", "", "width=400 ,height=200");
}
​
function closeWin() {
  if (myWindow) {
    myWindow.close();
  }
}
​
function checkWin() {
  msg = ""
  if (!myWindow) {
    msg = "was never opened";
  } else { 
    if (myWindow.closed) { 
      msg = "is closed";
    } else {
      msg = "is open";
    }
  
  }
  document.getElementById("msg").innerHTML = 
  "myWindow " + msg;
}
</script>
​
</head>
<body>
​
<button onclick="openWin()">Open myWindow</button>
<button onclick="closeWin()">Close myWindow</button>
<button onclick="checkWin()">Is myWindow open?</button>
​
<br><br>
<div id="msg"></div>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_win_closed by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:41:14 GMT -->
</html>
​
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