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<head>
  <meta charset="utf-8">
  <title>String.toLocaleLowerCase() — locales</title>
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  <pre id="out"></pre>
  <script>
    var locales = ["tr", "TR", "tr-TR", "tr-u-co-search", "tr-x-turkish"];
    document.getElementById("out").textContent =
      String("\u0130".toLocaleLowerCase(locales) === "i");
  </script>
</body>
</html>

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String.toLocaleLowerCase() — locales array (Try It)