Ticket #31527: 31527.twentyfourteen.patch

wp-content/themes/twentyfourteen/js/functions.js

@@ -7 +7 @@
  */
 ( function( $ ) {
         var body    = $( 'body' ),
-                _window = $( window );
+                _window = $( window ), nav, button, menu, secondary;
 
+        nav = $( '#primary-navigation' );
+        button = nav.find( '.menu-toggle' );
+        menu = nav.find( '.nav-menu' );
+        secondary = $( '#secondary' );
+
         // Enable menu toggle for small screens.
         ( function() {
-                var nav = $( '#primary-navigation' ), button, menu;
-                if ( ! nav ) {
+                if ( ! nav || ! button ) {
                         return;
                 }
 
-                button = nav.find( '.menu-toggle' );
-                if ( ! button ) {
-                        return;
-                }
-
                 // Hide button if menu is missing or empty.
-                menu = nav.find( '.nav-menu' );
                 if ( ! menu || ! menu.children().length ) {
                         button.hide();
                         return;
@@ -109 +107 @@
                 } );
         } );
 
+        // Add or remove ARIA attributes.
+        function onResizeARIA() {
+                if ( 781 > _window.width() ) {
+                        button.attr( 'aria-expanded', 'false' );
+                        secondary.attr( 'aria-expanded', 'false' );
+                        button.attr( 'aria-controls', 'secondary' );
+                } else {
+                        button.removeAttr( 'aria-expanded' );
+                        secondary.removeAttr( 'aria-expanded' );
+                        button.removeAttr( 'aria-controls' );
+                }
+        }
+
+        _window
+                .on( 'load.twentyfourteen', onResizeARIA )
+                .on( 'resize.twentyfourteen', function() {
+                        onResizeARIA();
+        } );
+
         _window.load( function() {
                 // Arrange footer widgets vertically.
                 if ( $.isFunction( $.fn.masonry ) ) {