title: Access html element via ngModel
body: <p>Imagine something like this:</p>
  
  <pre><code>&lt;input type='text' ng-model="x"&gt;
  </code></pre>
  
  <p>Now, using x in the controller, how can I change this element? let's say I want to change its class. Or add a random element before it.</p>
  
  <p><strong>Please note that I strictly wanna access the html element.</strong></p>
  
  <p>any idea?</p>