anchor.diff:  <div class="row monograph-assets-toc-epub">
     <div class="col-sm-12" id="tabs">
       <ul class="nav nav-tabs" role="tablist">
  -      <% if @presenter.epub? %>
  +      <% if @presenter.reader_ebook? %>
           <li role="presentation" class="active"><a id="tab-toc" href="#toc" data-toggle="tab" role="tab" aria-controls="toc" aria-selected="true" tabindex="0">Table of Contents</a></li>
         <% end %>
         <% if @presenter.assets? %>
  -        <% if @presenter.epub? %>
  +        <% if @presenter.reader_ebook? %>
             <li role="presentation"><a id="tab-resources" href="#resources" role="tab" data-toggle="tab" aria-controls="resources" aria-selected="false" tabindex="-1">Resources</a></li>
           <% else %>
             <li role="presentation" class="active"><a id="tab-resources" href="#resources" data-toggle="tab" role="tab" aria-controls="resources" aria-selected="true"  tabindex="0">Resources</a></li>
  
positive.code:       <li role="presentation"><a id="tab-stats" href="#stats" role="tab" data-toggle="tab" aria-controls="stats" aria-selected="false" tabindex="-1">Stats</a></li>
      </ul>
      <div id="tabs-content" class="tab-content monograph-assets-toc-epub-content" aria-live="polite">
        <% if @presenter.epub? || @presenter.pdf_ebook? %>
          <section id="toc" class="tab-pane active fade in toc row" role="tabpanel" aria-hidden="false" aria-labelledby="tab-toc" tabindex="0">
            <div class="col-sm-12">
              <h2 class="sr-only">Table of Contents</h2>
  
negative.code:         </section>
        <% end %>
        <% if @presenter.assets? %>
          <% if @presenter.reader_ebook? %>
          <section id="resources" class="tab-pane fade in resources row" role="tabpanel" aria-hidden="true" aria-labelledby="tab-resources" tabindex="0">
          <% else %>
          <section id="resources" class="tab-pane fade in active resources row" role="tabpanel" aria-hidden="false" aria-labelledby="tab-resources" tabindex="0">
  