JavaScript BOM open and close methods

<DOCTYPE html>
<html>
<head>
 <title>window open and close</title>
</head>
<body>
 <button onclick="openWindow()">Open Window</button>
 <button onclick="closeWindow()">Close Window</button>
 <script>
  var my;
  function openWindow()
  {
   my=window.open("https://tesla.com","_blank","width=500px,height=200px,left=500px,top=200px");
  }
  function closeWindow()
  {
   my.close();  
  }
 </script>
</body>
</html>



OUTPUT




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