Index: functions.php
===================================================================
--- functions.php	(revision 21626)
+++ functions.php	(working copy)
@@ -382,6 +382,8 @@
 		$classes[] = 'custom-background-empty';
 	elseif ( in_array( $background_color, array( 'fff', 'ffffff' ) ) )
 		$classes[] = 'custom-background-white';
+		
+	$classes[] = 'no-js';
 
 	return $classes;
 }
Index: js/navigation.js
===================================================================
--- js/navigation.js	(revision 21626)
+++ js/navigation.js	(working copy)
@@ -4,6 +4,9 @@
  * Handles toggling the navigation menu for small screens.
  */
 ( function() {
+	// Remove no-js class from body
+	document.body.className = document.body.className.replace('no-js','js');
+
 	var button = document.getElementById( 'site-navigation' ).getElementsByTagName( 'h3' )[0],
 	    menu   = document.getElementById( 'site-navigation' ).getElementsByTagName( 'ul' )[0];
 
Index: style.css
===================================================================
--- style.css	(revision 21626)
+++ style.css	(working copy)
@@ -537,6 +537,14 @@
 	display: inline-block;
 }
 
+/* Show navigation when javascript is off */
+.no-js .main-navigation ul.nav-menu {
+   display: block;
+}
+.no-js .menu-toggle {
+  display: none;
+}
+
 /* Banner */
 section[role="banner"] {
 	margin-bottom: 48px;