anchor.diff:  
     <%= auto_discovery_link_tag :atom, feed_posts_path() %>
     <%= auto_discovery_link_tag :rss, feed_posts_path(format: 'rss') %>
  -
  -  <!-- Google Analytics -->
  -  <script type="text/javascript">
  -    var _gaq = _gaq || [];
  -    _gaq.push(['_setAccount', 'UA-28946840-44']);
  -    _gaq.push(['_trackPageview']);
  -
  -    (function() {
  -      var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
  -      ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
  -      var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  -    })();
  -  </script>
   </head>
   <body>
  +  <!-- Google Tag Manager (noscript) -->
  +  <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-NWPT55L" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
  +
     <%= render 'shared/header' %>
   
     <div class="container">
  
positive.code:   </div>
  
    <%= render 'shared/footer' %>
  </body>
  </html>
  
negative.code:   <link rel="manifest" href="<%= asset_path("manifest.json") %>">
    <link rel="mask-icon" href="<%= asset_path("safari-pinned-tab.svg") %>" color="#5bbad5">
  
    <!--[if lt IE 9 ]>
      <%= stylesheet_link_tag "/css/styleIE.css" %>
    <![endif]-->
  