HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasStorageAccess await</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <button id="btn" type="button">Await hasStorageAccess()</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;
      }
      try {
        var hasAccess = await document.hasStorageAccess();
        out.textContent = hasAccess ? "granted" : "denied";
      } catch (err) {
        out.textContent = err.name + ": " + err.message;
      }
    });
  </script>
</body>
</html>

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Document.hasStorageAccess — async/await (Try It)