Index: wp-content/themes/twentythirteen/css/ie.css
===================================================================
--- wp-content/themes/twentythirteen/css/ie.css	(revision 27585)
+++ wp-content/themes/twentythirteen/css/ie.css	(working copy)
@@ -24,6 +24,11 @@
 	text-decoration: none;
 }
 
+.nav-menu .sub-menu,
+.nav-menu .children {
+	clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
+}
+
 .nav-menu .sub-menu ul,
 .nav-menu .children ul {
 	left: 100%;
Index: wp-content/themes/twentythirteen/js/functions.js
===================================================================
--- wp-content/themes/twentythirteen/js/functions.js	(revision 27585)
+++ wp-content/themes/twentythirteen/js/functions.js	(working copy)
@@ -46,6 +46,11 @@
 		$( '.menu-toggle' ).on( 'click.twentythirteen', function() {
 			nav.toggleClass( 'toggled-on' );
 		} );
+
+		// Enables dropdown menus on :focus for better accessibility.
+		menu.find( 'a' ).on( 'focus blur', function() {
+			$( this ).parents( '.menu-item' ).toggleClass( 'focus' );
+		} );
 	} )();
 
 	/**
@@ -64,7 +69,7 @@
 			element.focus();
 		}
 	} );
-
+	
 	/**
 	 * Arranges footer widgets vertically.
 	 */
Index: wp-content/themes/twentythirteen/style.css
===================================================================
--- wp-content/themes/twentythirteen/style.css	(revision 27585)
+++ wp-content/themes/twentythirteen/style.css	(working copy)
@@ -867,7 +867,9 @@
 }
 
 .nav-menu li:hover > a,
-.nav-menu li a:hover {
+.nav-menu li a:hover,
+.nav-menu li:focus > a,
+.nav-menu li a:focus  {
 	background-color: #220e10;
 	color: #fff;
 }
@@ -877,11 +879,14 @@
 	background-color: #220e10;
 	border: 2px solid #f7f5e7;
 	border-top: 0;
-	display: none;
 	padding: 0;
 	position: absolute;
 	left: -2px;
 	z-index: 99999;
+	height: 1px; 
+	width: 1px; 
+	overflow: hidden;
+	clip: rect(1px, 1px, 1px, 1px)	
 }
 
 .nav-menu .sub-menu ul,
@@ -899,13 +904,20 @@
 }
 
 ul.nav-menu ul a:hover,
-.nav-menu ul ul a:hover {
+.nav-menu ul ul a:hover,
+ul.nav-menu ul a:focus,
+.nav-menu ul ul a:focus {
 	background-color: #db572f;
 }
 
 ul.nav-menu li:hover > ul,
-.nav-menu ul li:hover > ul {
-	display: block;
+.nav-menu ul li:hover > ul ,
+ul.nav-menu .focus > ul,
+.nav-menu .focus > ul {
+	clip: inherit;
+	overflow: inherit;
+	height: inherit;
+	width: inherit;		
 }
 
 .nav-menu .current_page_item > a,