HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>characterSet modern</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var encoding = document.characterSet;
    var isUtf8 = encoding.toUpperCase().replace(/_/g, "-") === "UTF-8";
    document.getElementById("out").textContent = JSON.stringify({
      encoding: encoding,
      isUtf8: isUtf8
    }, null, 2);
  </script>
</body>
</html>

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Document.xmlEncoding — use characterSet (Try It)