diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-content/themes/twentyseventeen/assets/js/navigation.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-content/themes/twentyseventeen/assets/js/navigation.js	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,109 @@
+/* global twentyseventeenScreenReaderText */
+/**
+ * Theme functions file.
+ *
+ * Contains handlers for navigation and widget area.
+ */
+
+(function( $ ) {
+	var masthead, menuToggle, siteNavContain, siteNavigation;
+
+	function initMainNavigation( container ) {
+
+		// Add dropdown toggle that displays child menu items.
+		var dropdownToggle = $( '<button />', { 'class': 'dropdown-toggle', 'aria-expanded': false })
+			.append( twentyseventeenScreenReaderText.icon )
+			.append( $( '<span />', { 'class': 'screen-reader-text', text: twentyseventeenScreenReaderText.expand }) );
+
+		container.find( '.menu-item-has-children > a, .page_item_has_children > a' ).after( dropdownToggle );
+
+		// Set the active submenu dropdown toggle button initial state.
+		container.find( '.current-menu-ancestor > button' )
+			.addClass( 'toggled-on' )
+			.attr( 'aria-expanded', 'true' )
+			.find( '.screen-reader-text' )
+			.text( twentyseventeenScreenReaderText.collapse );
+		// Set the active submenu initial state.
+		container.find( '.current-menu-ancestor > .sub-menu' ).addClass( 'toggled-on' );
+
+		container.find( '.dropdown-toggle' ).click( function( e ) {
+			var _this = $( this ),
+				screenReaderSpan = _this.find( '.screen-reader-text' );
+
+			e.preventDefault();
+			_this.toggleClass( 'toggled-on' );
+			_this.next( '.children, .sub-menu' ).toggleClass( 'toggled-on' );
+
+			_this.attr( 'aria-expanded', _this.attr( 'aria-expanded' ) === 'false' ? 'true' : 'false' );
+
+			screenReaderSpan.text( screenReaderSpan.text() === twentyseventeenScreenReaderText.expand ? twentyseventeenScreenReaderText.collapse : twentyseventeenScreenReaderText.expand );
+		});
+	}
+
+	initMainNavigation( $( '.main-navigation' ) );
+
+	masthead       = $( '#masthead' );
+	menuToggle     = masthead.find( '.menu-toggle' );
+	siteNavContain = masthead.find( '.main-navigation' );
+	siteNavigation = masthead.find( '.main-navigation > div > ul' );
+
+	// Enable menuToggle.
+	(function() {
+
+		// Return early if menuToggle is missing.
+		if ( ! menuToggle.length ) {
+			return;
+		}
+
+		// Add an initial value for the attribute.
+		menuToggle.attr( 'aria-expanded', 'false' );
+
+		menuToggle.on( 'click.twentyseventeen', function() {
+			siteNavContain.toggleClass( 'toggled-on' );
+
+			$( this ).attr( 'aria-expanded', siteNavContain.hasClass( 'toggled-on' ) );
+		});
+	})();
+
+	// Fix sub-menus for touch devices and better focus for hidden submenu items for accessibility.
+	(function() {
+		if ( ! siteNavigation.length || ! siteNavigation.children().length ) {
+			return;
+		}
+
+		// Toggle `focus` class to allow submenu access on tablets.
+		function toggleFocusClassTouchScreen() {
+			if ( 'none' === $( '.menu-toggle' ).css( 'display' ) ) {
+
+				$( document.body ).on( 'touchstart.twentyseventeen', function( e ) {
+					if ( ! $( e.target ).closest( '.main-navigation li' ).length ) {
+						$( '.main-navigation li' ).removeClass( 'focus' );
+					}
+				});
+
+				siteNavigation.find( '.menu-item-has-children > a, .page_item_has_children > a' )
+					.on( 'touchstart.twentyseventeen', function( e ) {
+						var el = $( this ).parent( 'li' );
+
+						if ( ! el.hasClass( 'focus' ) ) {
+							e.preventDefault();
+							el.toggleClass( 'focus' );
+							el.siblings( '.focus' ).removeClass( 'focus' );
+						}
+					});
+
+			} else {
+				siteNavigation.find( '.menu-item-has-children > a, .page_item_has_children > a' ).unbind( 'touchstart.twentyseventeen' );
+			}
+		}
+
+		if ( 'ontouchstart' in window ) {
+			$( window ).on( 'resize.twentyseventeen', toggleFocusClassTouchScreen );
+			toggleFocusClassTouchScreen();
+		}
+
+		siteNavigation.find( 'a' ).on( 'focus.twentyseventeen blur.twentyseventeen', function() {
+			$( this ).parents( '.menu-item, .page_item' ).toggleClass( 'focus' );
+		});
+	})();
+})( jQuery );