anchor.diff:      <% styleguide_block  'Tabbed Navigation' do %>
         <nav class="tabs $modifier_class">
           <ul>
  -          <li><a class="active" href="#">Section One</a></li>
  +          <li class="is-active"><a href="#">Section One</a></li>
             <li><a href="#">Section Two</a></li>
             <li><a href="#">Section Three</a></li>
           </ul>
  
positive.code:       </div>
      <% end %>
  
      <!-- footer -->
      <h4 id="footer">Footer</h4>
        <% styleguide_block  'Site Footer' do %>
          <footer class="footer">
  
negative.code:       <ul>
          <li><a href="#carousel" class="js-jump-scroll">Carousel</a></li>
          <li><a href="#cta" class="js-jump-scroll">Call To Action</a></li>
          <li><a href="#figure" class="js-jump-scroll">Figure</a></li>
          <li><a href="#gallery" class="js-jump-scroll">Gallery</a></li>
          <li><a href="#info-bar" class="js-jump-scroll">Info Bar</a></li>
          <li><a href="#media" class="js-jump-scroll">Media</a></li>
          <li><a href="#media-opts" class="js-jump-scroll">Media Options</a></li>
          <li><a href="#polaroid" class="js-jump-scroll">Polaroid</a></li>
          <li><a href="#sponsor" class="js-jump-scroll">Sponsor</a></li>
          <li><a href="#tile" class="js-jump-scroll">Tile</a></li>
  