diff --git a/.github/workflows/ci-master.yml b/.github/workflows/ci-master.yml
new file mode 100644
index 0000000..4d868e7
--- /dev/null
+++ b/.github/workflows/ci-master.yml
@@ -0,0 +1,45 @@
+on: 
+  push:
+    branches:
+    - master
+
+name: CI
+
+jobs:
+
+  jekyll-latest:
+    name: Build Jekyll site (latest)
+    runs-on: ubuntu-latest
+    steps:
+
+    - uses: actions/checkout@master
+
+    - name: Build the site in the jekyll/builder container
+      run: |
+        docker run --rm \
+        --volume="${{ github.workspace }}:/srv/jekyll" \
+        jekyll/builder:latest /bin/bash -c "gem install bundler && chmod -R 777 /srv/jekyll && jekyll build && bundle exec just-the-docs rake search:init"
+  jekyll-3-8-5:
+    name: Build Jekyll site (v3.8.5)
+    runs-on: ubuntu-latest
+    steps:
+
+    - uses: actions/checkout@master
+
+    - name: Build the site in the jekyll/builder container
+      run: |
+        docker run --rm \
+        --volume="${{ github.workspace }}:/srv/jekyll" \
+        jekyll/builder:3.8.5 /bin/bash -c "gem install bundler && chmod -R 777 /srv/jekyll && jekyll build && bundle exec just-the-docs rake search:init"
+  assets:
+    name: Format and test CSS and JS
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js 12.x
+      uses: actions/setup-node@v1
+      with:
+        node-version: '12.x'
+    - run: npm install
+    - run: npm test
diff --git a/_config.yml b/_config.yml
index 2ef1604..ddaf13d 100644
--- a/_config.yml
+++ b/_config.yml
@@ -38,6 +38,9 @@ aux_links:
   "Just the Docs on GitHub":
     - "//github.com/pmarsceill/just-the-docs"
 
+# Makes Aux links open in a new tab. Default is false
+aux_links_new_tab: false
+
 # Sort order for navigation links
 nav_sort: case_insensitive # default, equivalent to nil
 # nav_sort: case_sensitive # Capital letters sorted before lowercase
diff --git a/_includes/nav.html b/_includes/nav.html
index 6858dec..93dcf21 100644
--- a/_includes/nav.html
+++ b/_includes/nav.html
@@ -2,12 +2,12 @@
   <ul class="navigation-list">
     {%- assign ordered_pages_list = site.html_pages | where_exp:"item", "item.nav_order != nil" -%}
     {%- assign unordered_pages_list = site.html_pages | where_exp:"item", "item.nav_order == nil" -%}
-    {%- if site.nav_sort == 'case_sensitive' -%}
-      {%- assign sorted_ordered_pages_list = ordered_pages_list | sort:"nav_order" -%}
-      {%- assign sorted_unordered_pages_list = unordered_pages_list | sort:"title" -%}
-    {%- else -%}
+    {%- if site.nav_sort == 'case_insensitive' -%}
       {%- assign sorted_ordered_pages_list = ordered_pages_list | sort_natural:"nav_order" -%}
       {%- assign sorted_unordered_pages_list = unordered_pages_list | sort_natural:"title" -%}
+    {%- else -%}
+      {%- assign sorted_ordered_pages_list = ordered_pages_list | sort:"nav_order" -%}
+      {%- assign sorted_unordered_pages_list = unordered_pages_list | sort:"title" -%}
     {%- endif -%}
     {%- assign pages_list = sorted_ordered_pages_list | concat: sorted_unordered_pages_list -%}
     {%- for node in pages_list -%}
@@ -29,7 +29,7 @@
                     {%- endif -%}
                     <a href="{{ child.url | absolute_url }}" class="navigation-list-link{% if page.url == child.url %} active{% endif %}">{{ child.title }}</a>
                     {%- if child.has_children -%}
-                        {%- assign grand_children_list = pages_list | where: "parent", child.title -%}
+                        {%- assign grand_children_list = pages_list | where: "parent", child.title | where: "grand_parent", node.title -%}
                         <ul class="navigation-list-child-list">
                         {%- for grand_child in grand_children_list -%}
                           <li class="navigation-list-item {% if page.url == grand_child.url %} active{% endif %}">
diff --git a/_layouts/default.html b/_layouts/default.html
index ba551ad..4ab8693 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -43,7 +43,15 @@ layout: table_wrappers
           {% if site.aux_links != nil %}
             <ul class="list-style-none text-small aux-nav">
               {% for link in site.aux_links %}
-                <li class="d-inline-block my-0{% unless forloop.last %} mr-2{% endunless %}"><a href="{{ link.last }}">{{ link.first }}</a></li>
+                <li class="d-inline-block my-0{% unless forloop.last %} mr-2{% endunless %}">
+                  <a href="{{ link.last }}"
+                    {% if site.aux_links_new_tab %} 
+                    target="_blank" rel="noopener noreferrer"
+                    {% endif %}
+                  >
+                    {{ link.first }}
+                  </a>
+                </li>
               {% endfor %}
             </ul>
           {% endif %}
@@ -75,8 +83,9 @@ layout: table_wrappers
             <hr>
             <h2 class="text-delta">Table of contents</h2>
             <ul>
-              {% for child in pages_list %}
-                {% if child.parent == page.title and child.title != page.title %}
+              {%- assign children_list = pages_list | where: "parent", node.title -%}
+              {% for child in children_list %}
+                {% if child.parent == page.title and child.title != page.title and child.grand_parent == page.parent %}
                 <li>
                   <a href="{{ child.url | absolute_url }}">{{ child.title }}</a>{% if child.summary %} - {{ child.summary }}{% endif %}
                 </li>
diff --git a/docs/configuration.md b/docs/configuration.md
index f3a7a02..2367efb 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -47,6 +47,9 @@ search_tokenizer_separator: /[\s/]+/
 aux_links:
   "Just the Docs on GitHub":
     - "//github.com/pmarsceill/just-the-docs"
+
+# Makes Aux links open in a new tab. Default is false
+aux_links_new_tab: false
 ```
 
 ## Heading anchor links
diff --git a/docs/navigation-structure.md b/docs/navigation-structure.md
index e5f29ad..c175582 100644
--- a/docs/navigation-structure.md
+++ b/docs/navigation-structure.md
@@ -41,8 +41,9 @@ nav_order: 4
 The specified `nav_order` parameters on a site should be all integers or all strings.
 Pages without a `nav_order` parameter are ordered alphabetically by their `title`,
 and appear after the explicitly-ordered pages at each level.
-To sort all Capital letters before lowercase letters,
-add `nav_sort: case_sensitive` in the configuration file.
+By default, all Capital letters are sorted before all lowercase letters;
+adding `nav_sort: case_insensitive` in the configuration file ignores case
+when sorting strings (but also sorts numbers lexicographically: `10` comes before `1`).
 
 ---