anchor.diff:              <%= link_to "Sign out", destroy_user_session_path, method: :delete, class: "dropdown-item" %>
             </div>
           </li>
  -      <% else %>
  +        <% else %>
           <li class="nav-item">
             <% if current_page?(user_session_path) %>
             <%= link_to "Sign in", user_session_path, class: "nav-link disabled" %>
             <% else %>
             <%= link_to "Sign in", user_session_path, class: "nav-link" %>
  -          <% end %> 
  -        </li> 
  -      <% end %>	      
  +          <% end %>
  +        </li>
  +        <% end %>
         </ul>
         <% if !user_signed_in? %>
  -  
  +
         <% end %>
  -	  </div>
  +    </div>
     </nav>
   
     <div class="container-fluid main-container">
       <%= render 'layouts/messages' %>
       <%= yield %>
  -  </div> 
  +  </div>
   
     <div>
       <%= yield :document_ready %>
  -  </div>  
  -    
  +  </div>
  +
     <footer class="footer">
       <small>
         WhatsOpt, version:
         <% if user_signed_in? %>
  -        <%= link_to_unless_current whatsopt_version, changelog_path =%>, 
  -        <%= deployment_info %>,
  -        <%= mail_to "remi.lafage@onera.fr", "contact", :encode => "hex" %>
  +      <%= link_to_unless_current whatsopt_version, changelog_path =%>,
  +      <%= deployment_info %>,
  +      <%= mail_to "remi.lafage@onera.fr", "contact", :encode => "hex" %>
         <% else %>
  -        <%= whatsopt_version %>, <%= deployment_info %>
  +      <%= whatsopt_version %>, <%= deployment_info %>
         <% end %>
  -      </small>
  +    </small>
     </footer>
   </body>
  -</html>
  +
  +</html>
positive.code: <!DOCTYPE html>
  <html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  
negative.code:   <meta name="relative-url-root" content="<%= Rails.application.config.relative_url_root%>" />
    <%= favicon_link_tag asset_path('favicon-32.png'), :rel => 'icon', :type =>  'image/png' %>
  </head>
  
  <body>
    <nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top" role="navigation">
      <%= link_to mdas_path, class: "navbar-brand" do %>
      <%= image_tag "logo_whatsopt_v1.0.svg", alt: "Logo", width: 32, height: 32, class: "d-inline-block align-top" %>
      <span>WhatsOpt</span>
      <% end %>
      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
  
      <div class="collapse navbar-collapse" id="navbarNavDropdown">
        <ul class="navbar-nav mr-auto">
          <% if user_signed_in? %>
          <li class="nav-item"><%= link_to "Analyses", mdas_path, class: "nav-link" %></li>
          <% end %>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Help</a>
            <div class="dropdown-menu" aria-labelledby="dropdown01">
              <%= link_to "Doc", "http://github.com/OneraHub/WhatsOpt-Doc", class: "dropdown-item" %>
              <%= link_to "API Doc", api_doc_path, class: "dropdown-item" %>
              <div class="dropdown-divider"></div>
              <%= link_to "Issues", "https://github.com/OneraHub/WhatsOpt/issues", class: "dropdown-item" %>
            </div>
          </li>
        </ul>
  
        <ul class="navbar-nav">
          <% if user_signed_in? %>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="dropdown02" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"><%= current_user.login %></a>
            <div class="dropdown-menu dropdown-menu-right" aria-labelledby="dropdown02">
  