CDN de React
<script
crossorigin
src="https://unpkg.com/react@16/umd/react.development.js"
></script>
<script
crossorigin
src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"
></script>CDN de BABEL
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>