Index: wp-admin/menu-header.php
===================================================================
--- wp-admin/menu-header.php	(revision 19471)
+++ wp-admin/menu-header.php	(working copy)
@@ -171,7 +171,7 @@
 <div id="adminmenuback"></div>
 <div id="adminmenuwrap">
 <div id="adminmenushadow"></div>
-<ul id="adminmenu">
+<ul id="adminmenu" role="navigation">
 
 <?php
 
Index: wp-includes/class-wp-admin-bar.php
===================================================================
--- wp-includes/class-wp-admin-bar.php	(revision 19471)
+++ wp-includes/class-wp-admin-bar.php	(working copy)
@@ -179,7 +179,7 @@
 		}
 
 		?>
-		<div id="wpadminbar" class="<?php echo $class; ?>">
+		<div id="wpadminbar" class="<?php echo $class; ?>" role="navigation">
 			<div class="quicklinks">
 				<?php foreach ( $this->root->children as $group ) {
 					$this->render_group( $group, 'ab-top-menu' );