Merge pull request #18662 from patrickhlauke/docs-collapse-accessibility-patch1

Docs: accessibility fix-up of collapsible content navbar, change site-wide main navbar

docs/_includes/nav-home.html

@@ -24,22 +24,36 @@
   </nav>
   {% endcomment %}
 
-  <div class="clearfix">
-    <button class="navbar-toggler pull-xs-right hidden-sm-up" type="button" data-toggle="collapse" data-target="#bd-main-nav">
-      &#9776;
-    </button>
-    <a class="navbar-brand hidden-sm-up" href="{{ site.baseurl }}/">
-      Bootstrap
-    </a>
-  </div>
-  <div class="collapse navbar-toggleable-xs" id="bd-main-nav">
-    <nav class="nav navbar-nav">
-      <a class="nav-item nav-link {% if page.layout == "home" %}active{% endif %}" href="{{ site.baseurl }}/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Bootstrap');">Bootstrap</a>
-      <a class="nav-item nav-link {% if page.layout == "docs" %}active{% endif %}" href="{{ site.baseurl }}/getting-started/introduction/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Docs');">Documentation</a>
-      <a class="nav-item nav-link {% if page.title == "Examples" %}active{% endif %}" href="{{ site.baseurl }}/examples/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Examples');">Examples</a>
-      <a class="nav-item nav-link" href="{{ site.themes }}" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Themes');">Themes</a>
-      <a class="nav-item nav-link" href="{{ site.expo }}" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Expo');">Expo</a>
-      <a class="nav-item nav-link" href="{{ site.blog }}" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Blog');">Blog</a>
-    </nav>
-  </div>
+  <nav>
+    <div class="clearfix">
+      <button class="navbar-toggler pull-xs-right hidden-sm-up" type="button" data-toggle="collapse" data-target="#bd-main-nav" aria-controls="bd-main-nav" aria-expanded="false" aria-label="Toggle navigation">
+        &#9776;
+      </button>
+      <a class="navbar-brand hidden-sm-up" href="{{ site.baseurl }}/">
+        Bootstrap
+      </a>
+    </div>
+    <div class="collapse navbar-toggleable-xs" id="bd-main-nav">
+      <ul class="nav navbar-nav">
+        <li class="nav-item active">
+          <a class="nav-item nav-link {% if page.layout == "home" %}active{% endif %}" href="{{ site.baseurl }}/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Bootstrap');">Bootstrap</a>
+        </li>
+        <li class="nav-item">
+          <a class="nav-item nav-link {% if page.layout == "docs" %}active{% endif %}" href="{{ site.baseurl }}/getting-started/introduction/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Docs');">Documentation</a>
+        </li>
+        <li class="nav-item">
+          <a class="nav-item nav-link {% if page.title == "Examples" %}active{% endif %}" href="{{ site.baseurl }}/examples/" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Examples');">Examples</a>
+        </li>
+        <li class="nav-item">
+          <a class="nav-item nav-link" href="{{ site.themes }}" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Themes');">Themes</a>
+        </li>
+        <li class="nav-item">
+          <a class="nav-item nav-link" href="{{ site.expo }}" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Expo');">Expo</a>
+        </li>
+        <li class="nav-item">
+          <a class="nav-item nav-link" href="{{ site.blog }}" onclick="ga('send', 'event', 'Navbar', 'Community links', 'Blog');">Blog</a>
+        </li>
+      </ul>
+    </div>
+  </nav>
 </header>

docs/components/navbar.md

@@ -240,16 +240,16 @@ Navbars can be statically placed (their default behavior), static without rounde
 Our collapse plugin allows you to use a `<button>` or `<a>` to toggle hidden content.
 
 {% example html %}
-<div class="collapse" id="exCollapsingNavbar">
-  <div class="bg-inverse p-a-1">
-    <h4>Collapsed content</h4>
-    <span class="text-muted">Toggleable via the navbar brand.</span>
-  </div>
-</div>
 <nav class="navbar navbar-light bg-faded">
-  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#exCollapsingNavbar">
+  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#exCollapsingNavbar" aria-controls="exCollapsingNavbar" aria-expanded="false" aria-label="Toggle navigation">
     &#9776;
   </button>
+  <div class="collapse" id="exCollapsingNavbar">
+    <div class="bg-inverse p-a-1">
+      <h4>Collapsed content</h4>
+      <span class="text-muted">Toggleable via the navbar brand.</span>
+    </div>
+  </div>
 </nav>
 {% endexample %}
 
@@ -257,7 +257,7 @@ For more complex navbar patterns, like those used in Bootstrap v3, use the `.nav
 
 {% example html %}
 <nav class="navbar navbar-light bg-faded">
-  <button class="navbar-toggler hidden-sm-up" type="button" data-toggle="collapse" data-target="#exCollapsingNavbar2">
+  <button class="navbar-toggler hidden-sm-up" type="button" data-toggle="collapse" data-target="#exCollapsingNavbar2" aria-controls="exCollapsingNavbar2" aria-expanded="false" aria-label="Toggle navigation">
     &#9776;
   </button>
   <div class="collapse navbar-toggleable-xs" id="exCollapsingNavbar2">