http://blog.paciellogroup.com/2013/02/using-wai-aria-landmarks-2013/#tablex
http://www.w3.org/TR/wai-aria/roles#complementary
<div class="container bs-docs-container">
<div class="row">
<div class="col-lg-3">
- <div class="bs-sidebar" role="complementary">
+ <aside class="bs-sidebar" role="complementary">
<ul class="nav bs-sidenav">
{% if page.slug == "getting-started" %}
{% include nav-getting-started.html %}
{% include nav-customize.html %}
{% endif %}
</ul>
- </div>
+ </aside>
</div>
<main class="col-lg-9" role="main">
{{ content }}