beta/public/html/single-file-example.html (19 lines of code) (raw):
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello World</title>
<script src="https://unpkg.com/react@17/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>
<!-- Don't use this in production—do this: https://reactjs.org/docs/add-react-to-a-website#add-jsx-to-a-project -->
<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
ReactDOM.render(
<h1>Hello, world!</h1>,
document.getElementById('root')
);
</script>
<!--
Note: this page is a great way to try React but it's not suitable for production.
It slowly compiles JSX with Babel in the browser and uses a large development build of React.
Read this section for a production-ready setup with JSX:
https://reactjs.org/docs/docs/add-react-to-a-website#try-react-with-jsx
In a larger project, you can use an integrated toolchain that includes JSX instead:
https://reactjs.org/docs/start-a-new-react-project
You can also use React without JSX, in which case you can remove Babel:
https://reactjs.org/docs/add-react-to-a-website#add-react-in-one-minute
-->
</body>
</html>