anchor.diff:          <p>Your feedback will help us <strong>make the site better</strong> and help us tell more people about it.</p>
       </div>
       <hr />
  -    
  +
       <% survey_form(@user.survey) do %>
           <table>
               <colgroup>
  
positive.code: 
  <% if @user.nil? %>
      <p><strong>The survey is only available to logged-in users.</strong></p>
  <% elsif @user.survey.already_done? %>
      <p>Thank you for completing the survey.</p>
  <% else %>
  
negative.code:             </tr>
              <tr>
                  <td class="us_label"><div class="us_label">
                  The incomes of households differ a lot in Britain today.
                                    Which figures best represents the total income of your household before tax?
              </div></td>
                  <td>
  