HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasStorageAccess request</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;white-space:pre-wrap;}</style>
</head>
<body>
  <p>On a top-level page this often reports already granted.</p>
  <button id="btn" type="button">Ensure storage access</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", async function () {
      var out = document.getElementById("out");
      if (typeof document.hasStorageAccess !== "function") {
        out.textContent = "unsupported";
        return;
      }
      if (await document.hasStorageAccess()) {
        out.textContent = "already granted";
        return;
      }
      if (typeof document.requestStorageAccess !== "function") {
        out.textContent = "cannot request";
        return;
      }
      try {
        await document.requestStorageAccess();
        out.textContent = "granted after request";
      } catch (err) {
        out.textContent = "request denied: " + err.name + "\n" + err.message;
      }
    });
  </script>
</body>
</html>

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Document.hasStorageAccess — request if denied (Try It)