toUpperCase and tolowerCase method.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>toUpperCase and tolowerCase method</title>
</head>
<body>
    <script>
        var string = "Hello world";
        // document.write(string.toUpperCase());
    document.write(string.toLocaleLowerCase());
    </script>
</body>
</html>