title: Responsive React Playgrond: share state with iframe
body: <p>I want React components inside and outside an iframe to access the same state. </p>
  
  <p>As an example i want a Panel to adjust the state outside the iframe that immediately rerenders the react component inside the iframe. Vice versa, I want changes to the component inside the iframe to propagate to the settings panel outside the iframe.</p>
  
  <p>What are my options? </p>
  
  <p>(The purpose is to build a way to preview how a component behaves responsively and iframe seems to be the most reliable option?)</p>