2.using_react.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root"></div>
    <script src="https://unpkg.com/react@16.13.1/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@16.13.1/umd/react-dom.development.js"></script>
    <script>
        const rootElement = document.getElementById("root")
        const headingElement = React.createElement(
            "h1",
            {
                className: "hello-react-text"
            },
            "Hello, React !"
        )
        ReactDOM.render(
            headingElement,
            rootElement
        )
    </script>
</body>
</html>