title: React composition events
body: <p>The React docs specifies three "composition events".</p>
  
  <pre><code>onCompositionEnd onCompositionStart onCompositionUpdate
  </code></pre>
  
  <p><a href="https://facebook.github.io/react/docs/events.html#composition-events" rel="noreferrer">https://facebook.github.io/react/docs/events.html#composition-events</a></p>
  
  <p>What does composition imply and when do these events occur?</p>