こちらと同様のサンプルです。
React で jsx を使うサンプル
index.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8">
<title>React Elements</title>
</head>
<body>
<div id="app"></div>
<br />
Mar/02/2022<br />
<script src="https://unpkg.com/react@18/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<script type="text/babel">
console.log("*** start ***")
const mm_aa = React.createElement("h1", null, "おはようございます。")
const mm_bb = React.createElement("div", null, "こんにちは。")
const mm_cc = <blockquote><div>今晩は。</div></blockquote>
const mm_dd = <div>Test</div>
const app = document.getElementById('app')
const root = ReactDOM.createRoot(app)
root.render([mm_aa,mm_bb,mm_cc,mm_dd])
console.log("*** end ***")
</script>
</body>
</html>
