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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.toLowerCase() — locale tip</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var dottedI = "\u0130";
    document.getElementById("out").textContent = [
      String(dottedI.toLowerCase() === "i"),
      String(dottedI.toLocaleLowerCase("tr") === "i")
    ].join("\n");
  </script>
</body>
</html>

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String.toLowerCase() — vs locale (Try It)