diff --git a/app/views/catalog/_show_default.html.erb b/app/views/catalog/_show_default.html.erb
index 96054b5f..f34b944c 100644
--- a/app/views/catalog/_show_default.html.erb
+++ b/app/views/catalog/_show_default.html.erb
@@ -11,23 +11,23 @@
       <% end %>
     <% end %>
     <div class='row'>
-      <div class='col-md-12'>
-        <ul class='nav nav-tabs nav-fill' role='tablist' aria-label='<%= t('arclight.views.show.tablist_nav') %>'>
+      <div class='col-md-12' role='tablist' aria-owns='context-tab content-tab access-tab'>
+        <ul class='nav nav-tabs nav-fill' aria-label='<%= t('arclight.views.show.tablist_nav') %>'>
           <li class='nav-item flex-fill'>
-            <a class='nav-link p-1 p-sm-2 active' data-toggle='tab' href='#context' role='tab'>
+            <a class='nav-link p-1 p-sm-2 active' id='context-tab' data-toggle='tab' href='#context' role='tab'>
               <%= t 'arclight.views.show.context' %>
             </a>
           </li>
           <% if document.online_content? && document.children? %>
             <li class='nav-item flex-fill'>
-              <a class='nav-link p-1 p-sm-2' data-toggle='tab' href='#online-content' role='tab' data-arclight-online-content-tab='true'>
+              <a class='nav-link p-1 p-sm-2' id='content-tab' data-toggle='tab' href='#online-content' role='tab' data-arclight-online-content-tab='true'>
                 <%= t 'arclight.views.show.online_content' %>
                 <span data-arclight-online-content-tab-count/>
               </a>
             </li>
           <% end %>
           <li class='nav-item flex-fill'>
-            <a class='nav-link p-1 p-sm-2' data-toggle='tab' href='#access' role='tab'>
+            <a class='nav-link p-1 p-sm-2' id='access-tab' data-toggle='tab' href='#access' role='tab'>
               <%= t 'arclight.views.show.access' %>
             </a>
           </li>
diff --git a/app/views/shared/_header_navbar.html.erb b/app/views/shared/_header_navbar.html.erb
index 2753ca35..f0066eea 100644
--- a/app/views/shared/_header_navbar.html.erb
+++ b/app/views/shared/_header_navbar.html.erb
@@ -35,8 +35,8 @@
             <%= link_to t('arclight.masthead_heading'), root_path, class: 'h1' %>
           </div>
 
-          <div class="col-md-4 nav-links d-flex justify-content-end" >
-            <ul class="navbar-nav" aria-label="browse" role="navigation">
+          <div class="col-md-4 nav-links d-flex justify-content-end" role="navigation">
+            <ul class="navbar-nav" aria-label="browse">
               <%= render 'shared/main_menu_links' %>
             </ul>
           </div>