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<head>
  <meta charset="utf-8">
  <title>doNotTrack — typeof</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var v = navigator.doNotTrack;
    var lines = [
      "value: " + String(v),
      "typeof: " + typeof v
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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doNotTrack — typeof (Try It)