HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>close() — self close</title>
</head>
<body>
  <button type="button" id="openBtn">Open popup with Close button</button>
  <script>
    document.getElementById("openBtn").onclick = function () {
      var popup = window.open("", "SelfClose", "width=320,height=160");
      popup.document.write('<p>Thanks! You may close this window.</p><button type="button" onclick="window.close()">Close</button>');
    };
  </script>
</body>
</html>

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JavaScript Window close() — self close (Try It)