<!DOCTYPE html>
<html lang="en-US">
<body>
<script>
var str = "i̇a Gesäß";
// 'lt-LT' = Lithuania
var locale = 'lt-LT';
var result1 = str.toLocaleUpperCase(locale);
var result2 = str.toUpperCase();
document.write(result1 == result2);
</script> </body>
</html>