anchor.diff:      <p>Then, you'll need to add a data-attribute to make the JS work properly on that element. That looks like:</p>
   
   <%= code_example '
  -<div class="alert-box" data-alert>
  +<div data-alert class="alert-box" data-alert>
     <!-- Your content goes here -->
     <a href="#" class="close">&times;</a>
   </div>
  
positive.code:   .close { @include alert-close; }
  }', :css %>
  
      <div class="alert-base bg">
        This is base, bg and close mixins.
        <a href="" class="close">&times;</a>
      </div>
  
negative.code:   @include radius($radius);
  }', :css %>
  
  <div data-alert class="alert-base bg radius success">
  This is base, bg and radius mixins.
  <a href="" class="close">&times;</a>
  </div>
  