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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>userAgentData — compare</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines = [];
    lines.push("classic userAgent length: " + navigator.userAgent.length);
    if ("userAgentData" in navigator) {
      lines.push("clientHints platform: " + navigator.userAgentData.platform);
      lines.push("clientHints mobile: " + navigator.userAgentData.mobile);
    } else {
      lines.push("clientHints: not supported — keep a fallback");
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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userAgentData — compare with userAgent (Try It)