anchor.diff: +<script>
  +$(function(){
  +  $('#tabs a').click(function(e){
  +    e.preventDefault();
  +    $(this).tab('show');
  +  });
  +});
  +</script>
  +
   <%= form_for(@tutorial) do |f| %>
   
     <% if @tutorial.errors.any? %>
  
positive.code: 
    <%= f.submit nil, class: 'btn btn-default' %>
  <% end %>
  
  <script>
  $('#tabs a').click(function(e) {
    e.preventDefault();
    $(this).tab('show');
  })
  </script>
  
negative.code:     </div>
  
      <div class="tab-pane" id="tutorial">
  <!--       <div class="form-group">
          <%= f.label :body_markdown %><br>
          <%= f.text_area :body_markdown %>
  