title: How to use ReactDOM.createPortal() in React 16?
body: <p>I'm using React 16 and need portals, but am not able to find any documentation on this feature. Does anyone know how to use this yet?</p>
  
  <p><a href="https://github.com/facebook/react/pull/10675" rel="noreferrer">https://github.com/facebook/react/pull/10675</a></p>
  
  <p>Thanks for any advice.</p>