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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>locks — secure</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines = [
      "secure: " + window.isSecureContext,
      "locks: " + Boolean(navigator.locks)
    ];
    if (!window.isSecureContext) {
      lines.push("Serve over HTTPS to use navigator.locks");
    } else if (!navigator.locks) {
      lines.push("Secure, but Web Locks not exposed");
    } else {
      lines.push("Ready to call request / query");
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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locks — secure context (Try It)