anchor.diff:  <div class='row'>
     <h4>Building your first form</h4>
   
  -  <p>
  -    Example: Lets build the following form.
  -  </p>
  +  <p>Example: Lets build the following form.</p>
   </div>
   
   <div class='row'>
  
positive.code: </div>
  
  <div class='row'>
    <p>
      The code is straightforward and looks like this:
    </p>
  
    <pre>
      <code data-language='ruby'>
  
negative.code: </div>
  
  <div class='row'>
    <p>The code is very simple, isn't it?</p>
  
    <p>
      But it can get better! We can use the <code>wrapper_mapping</code> option
  