title: MDC Automatic Instantiation
body: <p>I am currently using the "Manual Instantiation" method and it works great.
  I noticed the "Automatic Instantiation" method but can't get it to work.
  What exactly is needed to use this method?</p>
  
  <p>When I use the code:</p>
  
  <pre><code>mdc.tabs.MDCTabBar.attachTo(document.querySelector('#my-mdc-tab-bar'));
  </code></pre>
  
  <p>I get an error logging:
  "Uncaught ReferenceError: mdc is not defined".</p>
  
  <p>Reference here:
  <a href="https://github.com/material-components/material-components-web/tree/master/packages/mdc-tabs#automatic-instantiation" rel="noreferrer">https://github.com/material-components/material-components-web/tree/master/packages/mdc-tabs#automatic-instantiation</a></p>
  
  <p>Thanks.</p>