index-form.html

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">        
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
    <script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
    <title>Document</title>

</head>
<body>

<div id="app"></div>
<script type="text/babel">


    class App extends React.Component{
            state={
                name:'Ruchika',
                age: 20

            }
            handleChange=(e)=>{
                this.setState({
                    name:e.target.value
                });
            }
            handleSubmit=(e)=>{
                e.preventDefault();
                console.log('form has submitted', this.state.name);
            }
            render(){
                return(
                    <div className="app-content">
                    <h1>My name is {this.state.name}</h1>
                    <form onSubmit={this.handleSubmit}>
                        <input type="text" onChange={this.handleChange}/>
                        <button>Submit</button>
                    </form>
                    </div>
                )

            }
    } 
    ReactDOM.render(<App />, document.getElementById('app'));
</script>
</body>
</html>