Ticket #38397: 38397.diff

src/wp-content/themes/twentyseventeen/assets/js/navigation.js

@@ -26 +26 @@
                 container.find( '.current-menu-ancestor > button' ).addClass( 'toggled-on' );
                 container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
 
-                // Add menu items with submenus to aria-haspopup="true".
-                container.find( '.menu-item-has-children, .page_item_has_children' ).attr( 'aria-haspopup', 'true' );
+                // Add aria-haspopup="true" to menu items with submenus, and only if not an IE Touch device.
+                if (navigator.userAgent.toLowerCase().indexOf( 'msie' ) > -1 && navigator.msMaxTouchPoints) {
+                        container.find( '.menu-item-has-children, .page_item_has_children' ).attr( 'aria-haspopup', 'true' );
+                }
 
                 container.find( '.dropdown-toggle' ).click( function( e ) {
                         var _this            = $( this ),