HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>domain SecurityError</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var msg;
    try {
      document.domain = "example.org";
      msg = "Unexpectedly set (environment may differ)";
    } catch (err) {
      msg = err.name + ": " + err.message;
    }
    document.getElementById("out").textContent = msg;
  </script>
</body>
</html>

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document.domain SecurityError (Try It)