<!DOCTYPE html>
<html>
<head>
<title>Hello React</title>
</head>
<body>
<div id="root"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.24.0/babel.js"></script>
<script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>
<!-- Your script here -->
<script type="text/babel">
const element = <h1>Hello world!</h1>;
ReactDOM.render(
element,
document.querySelector('#root')
)
</script>
</body>
</html>