emit valid html:

Not closed div, <a> don't have alt but title, chrome frame has been
closed for at least a year, IE shoudl use edge mode. div cannot embed
span.

IPython/html/templates/page.html

@@ -6,7 +6,7 b''
 
     <title>{% block title %}IPython Notebook{% endblock %}</title>
     {% block favicon %}<link rel="shortcut icon" type="image/x-icon" href="{{static_url("base/images/favicon.ico") }}">{% endblock %}
-    <meta http-equiv="X-UA-Compatible" content="chrome=1">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
     <link rel="stylesheet" href="{{static_url("components/jquery-ui/themes/smoothness/jquery-ui.min.css") }}" type="text/css" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     
@@ -82,7 +82,7 b''
 
 <div id="header" class="navbar navbar-fixed-top">
   <div id="header-container" class="container">
-  <div id="ipython_notebook" class="nav navbar-brand pull-left"><a href="{{base_url}}tree" alt='dashboard'>{% block logo %}<img src='{{static_url("base/images/logo.png") }}' alt='Jupyter Notebook'/>{% endblock %}</a></div>
+  <div id="ipython_notebook" class="nav navbar-brand pull-left"><a href="{{base_url}}tree" title='dashboard'>{% block logo %}<img src='{{static_url("base/images/logo.png") }}' alt='Jupyter Notebook'/>{% endblock %}</a></div>
 
   {% block login_widget %}
 

IPython/html/templates/tree.html

@@ -44,7 +44,7 b' data-terminals-available="{{terminals_available}}"'
                         </span>
                     </span>
                 </form>
-              <span id="notebook_buttons" class="pull-right">
+              <div id="notebook_buttons" class="pull-right">
                 <div id="new-notebook-buttons" class="btn-group">
                   <button id="new_notebook" class="btn btn-default btn-xs">
                     New Notebook
@@ -58,7 +58,7 b' data-terminals-available="{{terminals_available}}"'
 
                   
                 <button id="refresh_notebook_list" title="Refresh notebook list" class="btn btn-default btn-xs"><i class="fa fa-refresh"></i></button>
-              </span>
+              </div>
             </div>
         </div>
 
@@ -141,9 +141,10 b' data-terminals-available="{{terminals_available}}"'
             </div>
         </div>
     </div>
-</div>
+    </div>
+</div><!-- tab_content --> 
 
-</div>
+</div><!-- ipython-main-app  -->
 
 {% endblock %}