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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>normalize NFC NFD</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var string1 = "\u00F1";
    var string2 = "\u006E\u0303";
    document.getElementById("out").textContent = [
      string1 === string2,
      string1.length,
      string2.length,
      string1.normalize("NFD") === string2.normalize("NFD"),
      string1.normalize("NFC") === string2.normalize("NFC"),
      string2.normalize("NFC").codePointAt(0).toString(16)
    ].join("\n");
  </script>
</body>
</html>

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String.normalize() — NFC vs NFD (Try It)