cdn react

1  <!-- Load React. -->
2  <script src="https://unpkg.com/react@17/umd/react.development.js" crossorigin></script>
3  <script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" crossorigin></script>

1<script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
2<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>

1<script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script>
2<script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>

1<script crossorigin src="https://unpkg.com/react@17/umd/react.production.min.js"></script>
2<script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js"></script>