React Portal All In One
react multi root
https://reactjs.org/docs/portals.html
https://zh-hans.reactjs.org/docs/portals.html
ReactDOM.createPortal(child, container)
demo
https://codepen.io/gaearon/pen/yzMaBd
Modal
refs
2017
https://github.com/reactjs/reactjs.org/commits/master/content/docs/portals.md
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