anchor.diff:  </head>
   <body onload="selectVersion('<%= version %>');">
     <%= render("_templates/_topnav.html.erb", :distro_key => distro_key) %>
  +  <%
  +    unsupported_versions = ["3.0", "3.1", "3.2", "3.3", "3.4", "3.5", "3.6", "3.7", "3.9", "3.10"];
  +  %>
     <div class="container">
       <p class="toggle-nav visible-xs pull-left">
         <button class="btn btn-default btn-sm" type="button" data-toggle="offcanvas">Toggle nav</button>
  
positive.code:           <div id="annoying-box"
              style="position: fixed; top: 100px; left: 10px; width: 100px; height: 100px; color: red">
                This documentation is work in progress and might not be complete or fully tested.
            </div>
          <% end %>
          <%= content %>
  
negative.code:           <select id="version-selector" onchange="versionSelector(this);">
              <% if (version == "4.3") %>
                <option value="4.3">4.3</option>
                <% end %>
                <option value="4.2">4.2</option>
                <option value="4.1">4.1</option>
                <option value="3.11">3.11</option>
  