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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>preferences — secure</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines = [];
    lines.push("isSecureContext: " + window.isSecureContext);
    lines.push(
      "preferences: " +
        ("preferences" in navigator && navigator.preferences
          ? "present"
          : "absent")
    );
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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preferences — secure context (Try It)