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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>normalize forms</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var str = "\u1E9B\u0323";
    function hexes(s) {
      return [...s].map(function (c) { return c.codePointAt(0).toString(16); }).join(" ");
    }
    document.getElementById("out").textContent = [
      "NFD: " + hexes(str.normalize("NFD")),
      "NFKC: " + str.normalize("NFKC").codePointAt(0).toString(16),
      "NFKD: " + hexes(str.normalize("NFKD"))
    ].join("\n");
  </script>
</body>
</html>

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String.normalize() — all forms (Try It)