React, Try React with CDN
<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
</head>
<body>
<div id="mydiv"></div>
<script type="text/babel">
function Hello() {
return <h1>Hello World!</h1>;
}
ReactDOM.render(<Hello />, document.getElementById('mydiv'))
</script>
</body>
</html>
Learn Reach from https://www.w3schools.com/react/react_getstarted.asp