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

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product — type (Try It)