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:         <a href="https://github.com/openshift/openshift-docs/commits/enterprise-<%= (distro_key == "openshift-enterprise") ? version : ((distro_key == "openshift-dedicated") ? "3.11" : "3.11") %>/<%= repo_path %>">
            Page history
          </a>
          /
          <a href="https://github.com/openshift/openshift-docs/issues/new?title=<%= (distro_key == "openshift-enterprise") ? "[enterprise-#{version}] Edit suggested in file #{repo_path}" :
            ((distro_key == "openshift-dedicated") ? "[dedicated] Edit suggested in file #{repo_path}" : "[online] Edit suggested in file #{repo_path}") %>">
            Suggest an edit
          </a>
        </span>
        <% end %>
      </ol>
  
negative.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 %>
          <%
             if (unsupported_versions.include? version)
          %>
            <font size="+1" color="red">You are viewing documentation for a release that is no longer supported. The latest supported version of version 3 is <a href="https://docs.openshift.com/container-platform/3.11/welcome/index.html">[3.11]</a>. For the most recent version 4, see <a href="https://docs.openshift.com/container-platform/latest/welcome/index.html">[4]</a></font>
            <div id="annoying-box"
              style="position: fixed; top: 100px; left: 10px; width: 100px; height: 100px; color: red">
                You are viewing documentation for a release that is no longer supported. The latest supported version of version 3 is <a href="https://docs.openshift.com/container-platform/3.11/welcome/index.html">[3.11]</a>. For the most recent version 4, see <a href="https://docs.openshift.com/container-platform/latest/welcome/index.html">[4]</a>
            </div>
          <% end %>
          <%= content %>
  