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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>oscpu — read</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function osInfo() {
      if (!("oscpu" in navigator) || !navigator.oscpu) {
        return "oscpu not supported";
      }
      return String(navigator.oscpu);
    }
    document.getElementById("out").textContent = osInfo();
  </script>
</body>
</html>

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oscpu — MDN osInfo (Try It)