diff --git a/.gitignore b/.gitignore
index 28a83b48f..907ccb8cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,7 +35,7 @@ src
 .idea/
 Read the Docs
 config.rst
-
+*.iml
 /.project
 /.pydevproject
 
diff --git a/notebook/templates/page.html b/notebook/templates/page.html
index af405fdfc..223731903 100644
--- a/notebook/templates/page.html
+++ b/notebook/templates/page.html
@@ -122,7 +122,7 @@ dir="ltr">
   </div>
 </noscript>
 
-<div id="header">
+<div id="header" role="navigation" aria-label="{% trans %}Top Menu{% endtrans %}">
   <div id="header-container" class="container">
   <div id="ipython_notebook" class="nav navbar-brand"><a href="{{default_url}}
     {%- if logged_in and token -%}?token={{token}}{%- endif -%}" title='{% trans %}dashboard{% endtrans %}'>
diff --git a/notebook/templates/tree.html b/notebook/templates/tree.html
index 13468ffb9..815aee467 100644
--- a/notebook/templates/tree.html
+++ b/notebook/templates/tree.html
@@ -27,7 +27,7 @@ data-server-root="{{server_root}}"
 {% block site %}
 
   <div id="ipython-main-app" class="container">
-    <div id="tab_content" class="tabbable">
+    <div id="tab_content" class="tabbable" role="main">
       <ul id="tabs" class="nav nav-tabs">
         <li class="active"><a href="#notebooks" data-toggle="tab">{% trans %}Files{% endtrans %}</a></li>
         <li><a href="#running" data-toggle="tab">{% trans %}Running{% endtrans %}</a></li>