HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasPrivateToken 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>This demo explains the MDN flow without calling a real issuer.</p>
  <button id="btn" type="button">Plan token request</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", async function () {
      var issuer = "https://issuer.example";
      var lines = [];
      if (typeof document.hasPrivateToken !== "function") {
        lines.push("API missing — skip issuance in this browser.");
        document.getElementById("out").textContent = lines.join("\n");
        return;
      }
      try {
        var hasToken = await document.hasPrivateToken(issuer);
        lines.push("hasToken: " + hasToken);
        if (!hasToken) {
          lines.push("Would POST to " + issuer + "/.well-known/private-state-token/issuance");
          lines.push("with privateToken: { version: 1, operation: \"token-request\" }");
        } else {
          lines.push("Token already stored — no request needed.");
        }
      } catch (err) {
        lines.push(err.name + ": " + err.message);
      }
      document.getElementById("out").textContent = lines.join("\n");
    });
  </script>
</body>
</html>

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Document.hasPrivateToken — request if missing (Try It)