title: Why is React's filesize so big given its small API?
body: <p>Here are the numbers</p>
  
  <ul>
  <li>min+gzip 26k  </li>
  <li>gzip 90k </li>
  <li>original 450+k</li>
  </ul>
  
  <p>And React doesn't have many features in it's documentation. Why is it so big?</p>
  
  <p>I have a feeling that it's the implementation of lightweight DOM. But I want to be sure. </p>