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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.toLocaleLowerCase() — practical</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function displayLabel(text, locale) {
      return text.toLocaleLowerCase(locale);
    }
    var title = "İSTANBUL GUIDE";
    var en = displayLabel(title, "en-US");
    var tr = displayLabel(title, "tr");
    document.getElementById("out").textContent = [
      String(en === tr),
      String(tr.includes("istan")),
      String("MIXED".toLocaleLowerCase() === "MIXED".toLowerCase())
    ].join("\n");
  </script>
</body>
</html>

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String.toLocaleLowerCase() — practical (Try It)