HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>requestStorageAccessFor basic</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}</style>
</head>
<body>
  <pre id="out">calling...</pre>
  <script>
    var out = document.getElementById("out");
    if (!("requestStorageAccessFor" in document)) {
      out.textContent = "unsupported";
    } else {
      document.requestStorageAccessFor("https://example.com").then(
        function () { out.textContent = "access granted"; },
        function (err) {
          out.textContent = "access denied " + (err && err.name ? err.name : "");
        }
      );
    }
  </script>
</body>
</html>

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Document.requestStorageAccessFor — MDN request (Try It)