<body>
<script crossorigin src="https://unpkg.com/react@18/umd/react.development.js">script>
<script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.development.js">script>
<script>
function HelloWorld() {
return React.CreateElement('div',null,'HelloWorld!!!')
}
ReactDom.render(HelloWorld(),document.body)
script>
body>