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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>btoa() — unicode</title>
</head>
<body>
  <h1>btoa() Unicode error</h1>
  <button type="button" id="btn">Encode ✓</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      var notOK = "✓";
      var lines = [notOK.codePointAt(0).toString(16)];
      try {
        lines.push(btoa(notOK));
      } catch (err) {
        lines.push(err.name);
      }
      document.getElementById("out").textContent = lines.join("\n");
    };
  </script>
</body>
</html>

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