HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>storage access flow</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}button{padding:0.5rem 1rem;}</style>
</head>
<body>
  <button type="button" id="go">Ensure storage access</button>
  <pre id="out">Click the button</pre>
  <script>
    async function ensureStorageAccess() {
      if (typeof document.hasStorageAccess !== "function") {
        return "hasStorageAccess unsupported";
      }
      if (await document.hasStorageAccess()) {
        return "already has access";
      }
      if (typeof document.requestStorageAccess !== "function") {
        return "requestStorageAccess unsupported";
      }
      try {
        await document.requestStorageAccess();
        return "granted";
      } catch (err) {
        return "denied";
      }
    }
    document.getElementById("go").addEventListener("click", async function () {
      document.getElementById("out").textContent = await ensureStorageAccess();
    });
  </script>
</body>
</html>

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hasStorageAccess then requestStorageAccess (Try It)