anchor.diff:    tabs.filename = () => $('.tab.filename', $tabs);
     tabs.stdout   = () => $('.tab.stdout'  , $tabs);
     tabs.stderr   = () => $('.tab.stderr'  , $tabs);
  +  tabs.status   = () => $('.tab.status'  , $tabs);
     tabs.repl     = () => $('.tab.REPL'    , $tabs);
   
     tabs.selected = () => $('.tab.selected', $tabs);
  
positive.code:     const tabNames = [];
      tabNames.push(tabs.stdout().text());
      tabNames.push(tabs.stderr().text());
      tabNames.push('status');
      tabNames.push(tabs.repl().text());
      return tabNames.includes(filename);
  
negative.code: <div class="tab-filenames">
    <div class="tab filename">cyber-dojo.sh</div>
    <div class="tab REPL">+REPL</div>
    <%# These three float:right so are in reverse order of appearance %>  
    <div class="tab status">status</div>
    <div class="tab stderr">stderr</div>
    <div class="tab stdout">stdout</div>
  </div>
  