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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>appCodeName — compare</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines = [];
    lines.push("appCodeName: " + navigator.appCodeName);
    lines.push("userAgent starts: " + navigator.userAgent.slice(0, 24) + "…");
    lines.push(
      "appCodeName alone identifies brand? " +
        (navigator.appCodeName !== "Mozilla" ? "maybe" : "no")
    );
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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appCodeName vs userAgent (Try It)