anchor.diff:          </footer>
         </div>
       </div>
  +
       <script src="https://sitevalidator.com/cdn/highlightjs/7.3/highlight.min.js"></script>
       <script>hljs.initHighlightingOnLoad();</script>
     </body>
  
positive.code:               <ul class="page_warnings">
                <% page.warnings.sort_by {|w| w.line.to_i}.each do |warning| %>
                  <li>
                    <% if warning.message_id == 'html5' %>
                      HTML5 warning on line <%= warning.line %>:
                    <% else %>
                      Warning <a href="http://validator.w3.org/docs/errors.html#ve-<%= warning.message_id %>"><%= warning.message_id %></a>
                      on line <%= warning.line %>:
                    <% end %>
  
                    <%= CGI::escapeHTML(warning.text) %>
  
                    <% if warning.source && warning.source.strip.length > 0 %>
                      <pre><code class="html"><%= warning.source.strip %></code></pre>
                    <% end %>
  
                    <% if warning.explanation && warning.explanation.strip.length > 0 %>
                      <div class="w3c_explanation"><%= warning.explanation.strip %></div>
                    <% end %>
                  </li>
                <% end %>
                </ul>
  
negative.code:       /* Explanations */
        .w3c_explanation { border: 1px solid #ddd; background-color: #ffe; padding: 10px; margin: -10px 5px 25px 5px; }
        .helpwanted { float: right; font-size: 2em; }
        .details { display: none; }
        .coordinates { float: right; margin: 5px 10px; background-color: #fff; color: #333; border: 1px solid #aaa;}
  
      </style>
  
  