React Js String startsWith() Method

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
        function App() {
           const str = " Hello, World!";
            const startsWithSpace = str.startsWith(" ");

return (
                <div className='container'>
                    {startsWithSpace ? (
                        <p>String starts with a space</p>
                    ) : (
                        <p>String does not start with a space</p>
                    )}
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById('app'));
    </script>
    <style>
        .container {
            width: 600px;
            margin: 0 auto;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }
    </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 startsWithSpace = str.startsWith(" ");
​
            return (
                <div className='container'>
                    {startsWithSpace ? (
                        <p>String starts with a space</p>
                    ) : (
                        <p>String does not start with a space</p>
                    )}
                </div>
            );
        }
​
        ReactDOM.render(<App />, document.getElementById('app'));
    </script>
    <style>
        .container {
            width: 600px;
            margin: 0 auto;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }
    </style>
</body>
​
</html>