React Js String Charat Method

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
        function App() {
       const str = "Hello, world!";
            const thirdCharacter = str.charAt(2);

return (
                <div className='container'>
                    <h3>React Js charat() Method</h3>
                    <p>String: {str}</p>
                    <p>specficChar: {thirdCharacter}</p>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById('app'));
    </script>
    <style>
        .container {
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            width: 600px;
            margin: 0 auto;
            padding: 20px;
        }

h3 {
            color: #333;
            font-size: 24px;
            margin-bottom: 10px;
        }

p {
            color: #555;
            font-size: 18px;
            margin-bottom: 8px;
        }

p:last-child {
            margin-bottom: 0;
        }
    </style>
</body>

</html>

 
<!DOCTYPE html>
<html>
​
<head>
    <meta charset="UTF-8" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>
​
<body>
    <div id="app"></div>
    <script type="text/babel">
        function App() {
       const str = "Hello, world!";
            const thirdCharacter = str.charAt(2);
​
            return (
                <div className='container'>
                    <h3>React Js charat() Method</h3>
                    <p>String: {str}</p>
                    <p>specficChar: {thirdCharacter}</p>
                </div>
            );
        }
​
        ReactDOM.render(<App />, document.getElementById('app'));
    </script>
    <style>
        .container {
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            width: 600px;
            margin: 0 auto;
            padding: 20px;
        }
​
        h3 {
            color: #333;
            font-size: 24px;
            margin-bottom: 10px;
        }
​
        p {
            color: #555;
            font-size: 18px;
            margin-bottom: 8px;
        }
​
        p:last-child {
            margin-bottom: 0;
        }
    </style>
</body>
​
</html>