HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>UTF-8 check</title>
</head>
<body>
  <p>Emoji test: &#128640;</p>
  <pre id="out"></pre>
  <script>
    var isUtf8 = document.characterSet.toUpperCase().replace(/_/g, "-") === "UTF-8";
    document.getElementById("out").textContent = [
      "Using UTF-8: " + isUtf8,
      "Actual encoding: " + document.characterSet
    ].join("\n");
  </script>
</body>
</html>

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Document.characterSet — UTF-8 check (Try It)