anchor.diff:    <div class="controls">
       <%= f.text_field :first_name, :class => "required", 'aria-required' => 'true' %>
       <span class="help-inline">
  -      <%= errors.join (', ') %>
  +      <%#= errors.join (', ') %>
       </span>
     </div>
   </div>
  
positive.code:   <div class="controls">
      <%= f.text_field :last_name, :class => "required", 'aria-required' => 'true' %>
        <span class="help-inline">
          <%=errors.join (', ')%>
      </span>
    </div>
  </div>
  
negative.code:   <div class="controls">
      <%= f.text_field :login_id, readonly: !@user.new_record?, :class => "required", 'aria-required' => 'true' %>
      <span class="help-inline">
        <%#= errors.join (', ') %>
      </span>
    </div>
  </div>
  