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  <title>productSub — classify</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var value = navigator.productSub;
    var note = "other / missing";
    if (value === "20030107") {
      note = "common Chromium / Safari token (MDN)";
    } else if (value === "20100101") {
      note = "common Firefox token (MDN)";
    }
    var lines = [
      "value: " + value,
      "note: " + note,
      "Do not use this as a browser detector."
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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productSub — classify tokens (Try It)