anchor.diff:              <ul class="page_errors">
               <% page.errors.each do |error| %>
                 <li>
  -                Error <a href="http://validator.w3.org/docs/errors.html#ve-<%= error.message_id %>"><%= error.message_id %></a> on line <%= error.line %>:
  +                Error <a href="http://validator.w3.org/docs/errors.html#ve-<%= error.message_id %>"><%= error.message_id %></a>
  +                on line <%= error.line %>:
                   <%= error.text %>
                 </li>
               <% end %>
  
positive.code:             <ul class="page_warnings">
              <% page.warnings.each do |warning| %>
                <li>
                  Warning <a href="http://validator.w3.org/docs/errors.html#ve-<%= warning.message_id %>"><%= warning.message_id %></a> on line <%= warning.line %>:
                  <%= warning.text %>
                </li>
              <% end %>
  
negative.code:         <h2>POPULAR WARNINGS</h2>
          <ul>
          <% warnings.group_by {|w| w.message_id}.sort_by {|m,w| w.length}.reverse.each do |message_id, warnings| %>
            <li>
              warning <a href="http://validator.w3.org/docs/errors.html#ve-<%= message_id %>"><%= message_id %></a>
              found <%= warnings.length %> times
            </li>
          <% end %>
          </ul>
        <% end %>
  