Ticket #21440: 21440.matchMedia.patch

wp-content/themes/twentytwelve/js/theme.js

@@ -6 +6 @@
 
 jQuery( document ).ready( function( $ ) {
         var masthead = $( '#masthead' ),
-                largeWindow = window.matchMedia( 'screen and (min-width: 600px)' ),
+                largeWindow = ( ! window.matchMedia ) || window.matchMedia( 'screen and (min-width: 600px)' ).matches,
                 timeout = false;
 
         $.fn.smallMenu = function() {
@@ -20 +20 @@
         };
 
         // Check viewport width on first load.
-        if ( ! largeWindow.matches )
+        if ( ! largeWindow )
                 $.fn.smallMenu();
 
         // Check viewport width when user resizes the browser window.
@@ -29 +29 @@
                         clearTimeout( timeout );
 
                 timeout = setTimeout( function() {
-                        if ( ! largeWindow.matches ) {
+                        if ( ! largeWindow ) {
                                 $.fn.smallMenu();
                         } else {
                                 masthead.find( '.site-navigation' ).removeClass( 'main-small-navigation' ).addClass( 'main-navigation' );