HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>top-level-storage-access query</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}</style>
</head>
<body>
  <pre id="out">querying...</pre>
  <script>
    async function checkTopLevelAccess() {
      if (!navigator.permissions || !navigator.permissions.query) {
        return "Permissions API unavailable";
      }
      try {
        var permission = await navigator.permissions.query({
          name: "top-level-storage-access",
          requestedOrigin: "https://www.example.com"
        });
        return "state: " + permission.state;
      } catch (err) {
        return "query failed: " + (err && err.name ? err.name : err);
      }
    }
    checkTopLevelAccess().then(function (msg) {
      document.getElementById("out").textContent = msg;
    });
  </script>
</body>
</html>

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top-level-storage-access Permissions.query (Try It)