ru-se.com

index.js (25738B)

---

 /*	-----------------------------------------------------------------------------------------------
 	Namespace
 --------------------------------------------------------------------------------------------------- */
 
 var twentytwenty = twentytwenty || {};
 
 // Set a default value for scrolled.
 twentytwenty.scrolled = 0;
 
 // polyfill closest
 // https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#Polyfill
 if ( ! Element.prototype.closest ) {
 	Element.prototype.closest = function( s ) {
 		var el = this;
 
 		do {
 			if ( el.matches( s ) ) {
 				return el;
 			}
 
 			el = el.parentElement || el.parentNode;
 		} while ( el !== null && el.nodeType === 1 );
 
 		return null;
 	};
 }
 
 // polyfill forEach
 // https://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach#Polyfill
 if ( window.NodeList && ! NodeList.prototype.forEach ) {
 	NodeList.prototype.forEach = function( callback, thisArg ) {
 		var i;
 		var len = this.length;
 
 		thisArg = thisArg || window;
 
 		for ( i = 0; i < len; i++ ) {
 			callback.call( thisArg, this[ i ], i, this );
 		}
 	};
 }
 
 // event "polyfill"
 twentytwenty.createEvent = function( eventName ) {
 	var event;
 	if ( typeof window.Event === 'function' ) {
 		event = new Event( eventName );
 	} else {
 		event = document.createEvent( 'Event' );
 		event.initEvent( eventName, true, false );
 	}
 	return event;
 };
 
 // matches "polyfill"
 // https://developer.mozilla.org/es/docs/Web/API/Element/matches
 if ( ! Element.prototype.matches ) {
 	Element.prototype.matches =
 		Element.prototype.matchesSelector ||
 		Element.prototype.mozMatchesSelector ||
 		Element.prototype.msMatchesSelector ||
 		Element.prototype.oMatchesSelector ||
 		Element.prototype.webkitMatchesSelector ||
 		function( s ) {
 			var matches = ( this.document || this.ownerDocument ).querySelectorAll( s ),
 				i = matches.length;
 			while ( --i >= 0 && matches.item( i ) !== this ) {}
 			return i > -1;
 		};
 }
 
 // Add a class to the body for when touch is enabled for browsers that don't support media queries
 // for interaction media features. Adapted from <https://codepen.io/Ferie/pen/vQOMmO>.
 twentytwenty.touchEnabled = {
 
 	init: function() {
 		var matchMedia = function() {
 			// Include the 'heartz' as a way to have a non-matching MQ to help terminate the join. See <https://git.io/vznFH>.
 			var prefixes = [ '-webkit-', '-moz-', '-o-', '-ms-' ];
 			var query = [ '(', prefixes.join( 'touch-enabled),(' ), 'heartz', ')' ].join( '' );
 			return window.matchMedia && window.matchMedia( query ).matches;
 		};
 
 		if ( ( 'ontouchstart' in window ) || ( window.DocumentTouch && document instanceof window.DocumentTouch ) || matchMedia() ) {
 			document.body.classList.add( 'touch-enabled' );
 		}
 	}
 }; // twentytwenty.touchEnabled
 
 /*	-----------------------------------------------------------------------------------------------
 	Cover Modals
 --------------------------------------------------------------------------------------------------- */
 
 twentytwenty.coverModals = {
 
 	init: function() {
 		if ( document.querySelector( '.cover-modal' ) ) {
 			// Handle cover modals when they're toggled.
 			this.onToggle();
 
 			// When toggled, untoggle if visitor clicks on the wrapping element of the modal.
 			this.outsideUntoggle();
 
 			// Close on escape key press.
 			this.closeOnEscape();
 
 			// Hide and show modals before and after their animations have played out.
 			this.hideAndShowModals();
 		}
 	},
 
 	// Handle cover modals when they're toggled.
 	onToggle: function() {
 		document.querySelectorAll( '.cover-modal' ).forEach( function( element ) {
 			element.addEventListener( 'toggled', function( event ) {
 				var modal = event.target,
 					body = document.body;
 
 				if ( modal.classList.contains( 'active' ) ) {
 					body.classList.add( 'showing-modal' );
 				} else {
 					body.classList.remove( 'showing-modal' );
 					body.classList.add( 'hiding-modal' );
 
 					// Remove the hiding class after a delay, when animations have been run.
 					setTimeout( function() {
 						body.classList.remove( 'hiding-modal' );
 					}, 500 );
 				}
 			} );
 		} );
 	},
 
 	// Close modal on outside click.
 	outsideUntoggle: function() {
 		document.addEventListener( 'click', function( event ) {
 			var target = event.target;
 			var modal = document.querySelector( '.cover-modal.active' );
 
 			// if target onclick is <a> with # within the href attribute
 			if ( event.target.tagName.toLowerCase() === 'a' && event.target.hash.includes( '#' ) && modal !== null ) {
 				// untoggle the modal
 				this.untoggleModal( modal );
 				// wait 550 and scroll to the anchor
 				setTimeout( function() {
 					var anchor = document.getElementById( event.target.hash.slice( 1 ) );
 					anchor.scrollIntoView();
 				}, 550 );
 			}
 
 			if ( target === modal ) {
 				this.untoggleModal( target );
 			}
 		}.bind( this ) );
 	},
 
 	// Close modal on escape key press.
 	closeOnEscape: function() {
 		document.addEventListener( 'keydown', function( event ) {
 			if ( event.keyCode === 27 ) {
 				event.preventDefault();
 				document.querySelectorAll( '.cover-modal.active' ).forEach( function( element ) {
 					this.untoggleModal( element );
 				}.bind( this ) );
 			}
 		}.bind( this ) );
 	},
 
 	// Hide and show modals before and after their animations have played out.
 	hideAndShowModals: function() {
 		var _doc = document,
 			_win = window,
 			modals = _doc.querySelectorAll( '.cover-modal' ),
 			htmlStyle = _doc.documentElement.style,
 			adminBar = _doc.querySelector( '#wpadminbar' );
 
 		function getAdminBarHeight( negativeValue ) {
 			var height,
 				currentScroll = _win.pageYOffset;
 
 			if ( adminBar ) {
 				height = currentScroll + adminBar.getBoundingClientRect().height;
 
 				return negativeValue ? -height : height;
 			}
 
 			return currentScroll === 0 ? 0 : -currentScroll;
 		}
 
 		function htmlStyles() {
 			var overflow = _win.innerHeight > _doc.documentElement.getBoundingClientRect().height;
 
 			return {
 				'overflow-y': overflow ? 'hidden' : 'scroll',
 				position: 'fixed',
 				width: '100%',
 				top: getAdminBarHeight( true ) + 'px',
 				left: 0
 			};
 		}
 
 		// Show the modal.
 		modals.forEach( function( modal ) {
 			modal.addEventListener( 'toggle-target-before-inactive', function( event ) {
 				var styles = htmlStyles(),
 					offsetY = _win.pageYOffset,
 					paddingTop = ( Math.abs( getAdminBarHeight() ) - offsetY ) + 'px',
 					mQuery = _win.matchMedia( '(max-width: 600px)' );
 
 				if ( event.target !== modal ) {
 					return;
 				}
 
 				Object.keys( styles ).forEach( function( styleKey ) {
 					htmlStyle.setProperty( styleKey, styles[ styleKey ] );
 				} );
 
 				_win.twentytwenty.scrolled = parseInt( styles.top, 10 );
 
 				if ( adminBar ) {
 					_doc.body.style.setProperty( 'padding-top', paddingTop );
 
 					if ( mQuery.matches ) {
 						if ( offsetY >= getAdminBarHeight() ) {
 							modal.style.setProperty( 'top', 0 );
 						} else {
 							modal.style.setProperty( 'top', ( getAdminBarHeight() - offsetY ) + 'px' );
 						}
 					}
 				}
 
 				modal.classList.add( 'show-modal' );
 			} );
 
 			// Hide the modal after a delay, so animations have time to play out.
 			modal.addEventListener( 'toggle-target-after-inactive', function( event ) {
 				if ( event.target !== modal ) {
 					return;
 				}
 
 				setTimeout( function() {
 					var clickedEl = twentytwenty.toggles.clickedEl;
 
 					modal.classList.remove( 'show-modal' );
 
 					Object.keys( htmlStyles() ).forEach( function( styleKey ) {
 						htmlStyle.removeProperty( styleKey );
 					} );
 
 					if ( adminBar ) {
 						_doc.body.style.removeProperty( 'padding-top' );
 						modal.style.removeProperty( 'top' );
 					}
 
 					if ( clickedEl !== false ) {
 						clickedEl.focus();
 						clickedEl = false;
 					}
 
 					_win.scrollTo( 0, Math.abs( _win.twentytwenty.scrolled + getAdminBarHeight() ) );
 
 					_win.twentytwenty.scrolled = 0;
 				}, 500 );
 			} );
 		} );
 	},
 
 	// Untoggle a modal.
 	untoggleModal: function( modal ) {
 		var modalTargetClass,
 			modalToggle = false;
 
 		// If the modal has specified the string (ID or class) used by toggles to target it, untoggle the toggles with that target string.
 		// The modal-target-string must match the string toggles use to target the modal.
 		if ( modal.dataset.modalTargetString ) {
 			modalTargetClass = modal.dataset.modalTargetString;
 
 			modalToggle = document.querySelector( '*[data-toggle-target="' + modalTargetClass + '"]' );
 		}
 
 		// If a modal toggle exists, trigger it so all of the toggle options are included.
 		if ( modalToggle ) {
 			modalToggle.click();
 
 			// If one doesn't exist, just hide the modal.
 		} else {
 			modal.classList.remove( 'active' );
 		}
 	}
 
 }; // twentytwenty.coverModals
 
 /*	-----------------------------------------------------------------------------------------------
 	Intrinsic Ratio Embeds
 --------------------------------------------------------------------------------------------------- */
 
 twentytwenty.intrinsicRatioVideos = {
 
 	init: function() {
 		this.makeFit();
 
 		window.addEventListener( 'resize', function() {
 			this.makeFit();
 		}.bind( this ) );
 	},
 
 	makeFit: function() {
 		document.querySelectorAll( 'iframe, object, video' ).forEach( function( video ) {
 			var ratio, iTargetWidth,
 				container = video.parentNode;
 
 			// Skip videos we want to ignore.
 			if ( video.classList.contains( 'intrinsic-ignore' ) || video.parentNode.classList.contains( 'intrinsic-ignore' ) ) {
 				return true;
 			}
 
 			if ( ! video.dataset.origwidth ) {
 				// Get the video element proportions.
 				video.setAttribute( 'data-origwidth', video.width );
 				video.setAttribute( 'data-origheight', video.height );
 			}
 
 			iTargetWidth = container.offsetWidth;
 
 			// Get ratio from proportions.
 			ratio = iTargetWidth / video.dataset.origwidth;
 
 			// Scale based on ratio, thus retaining proportions.
 			video.style.width = iTargetWidth + 'px';
 			video.style.height = ( video.dataset.origheight * ratio ) + 'px';
 		} );
 	}
 
 }; // twentytwenty.instrinsicRatioVideos
 
 /*	-----------------------------------------------------------------------------------------------
 	Modal Menu
 --------------------------------------------------------------------------------------------------- */
 twentytwenty.modalMenu = {
 
 	init: function() {
 		// If the current menu item is in a sub level, expand all the levels higher up on load.
 		this.expandLevel();
 		this.keepFocusInModal();
 	},
 
 	expandLevel: function() {
 		var modalMenus = document.querySelectorAll( '.modal-menu' );
 
 		modalMenus.forEach( function( modalMenu ) {
 			var activeMenuItem = modalMenu.querySelector( '.current-menu-item' );
 
 			if ( activeMenuItem ) {
 				twentytwentyFindParents( activeMenuItem, 'li' ).forEach( function( element ) {
 					var subMenuToggle = element.querySelector( '.sub-menu-toggle' );
 					if ( subMenuToggle ) {
 						twentytwenty.toggles.performToggle( subMenuToggle, true );
 					}
 				} );
 			}
 		} );
 	},
 
 	keepFocusInModal: function() {
 		var _doc = document;
 
 		_doc.addEventListener( 'keydown', function( event ) {
 			var toggleTarget, modal, selectors, elements, menuType, bottomMenu, activeEl, lastEl, firstEl, tabKey, shiftKey,
 				clickedEl = twentytwenty.toggles.clickedEl;
 
 			if ( clickedEl && _doc.body.classList.contains( 'showing-modal' ) ) {
 				toggleTarget = clickedEl.dataset.toggleTarget;
 				selectors = 'input, a, button';
 				modal = _doc.querySelector( toggleTarget );
 
 				elements = modal.querySelectorAll( selectors );
 				elements = Array.prototype.slice.call( elements );
 
 				if ( '.menu-modal' === toggleTarget ) {
 					menuType = window.matchMedia( '(min-width: 1000px)' ).matches;
 					menuType = menuType ? '.expanded-menu' : '.mobile-menu';
 
 					elements = elements.filter( function( element ) {
 						return null !== element.closest( menuType ) && null !== element.offsetParent;
 					} );
 
 					elements.unshift( _doc.querySelector( '.close-nav-toggle' ) );
 
 					bottomMenu = _doc.querySelector( '.menu-bottom > nav' );
 
 					if ( bottomMenu ) {
 						bottomMenu.querySelectorAll( selectors ).forEach( function( element ) {
 							elements.push( element );
 						} );
 					}
 				}
 
 				lastEl = elements[ elements.length - 1 ];
 				firstEl = elements[0];
 				activeEl = _doc.activeElement;
 				tabKey = event.keyCode === 9;
 				shiftKey = event.shiftKey;
 
 				if ( ! shiftKey && tabKey && lastEl === activeEl ) {
 					event.preventDefault();
 					firstEl.focus();
 				}
 
 				if ( shiftKey && tabKey && firstEl === activeEl ) {
 					event.preventDefault();
 					lastEl.focus();
 				}
 			}
 		} );
 	}
 }; // twentytwenty.modalMenu
 
 /*	-----------------------------------------------------------------------------------------------
 	Primary Menu
 --------------------------------------------------------------------------------------------------- */
 
 twentytwenty.primaryMenu = {
 
 	init: function() {
 		this.focusMenuWithChildren();
 	},
 
 	// The focusMenuWithChildren() function implements Keyboard Navigation in the Primary Menu
 	// by adding the '.focus' class to all 'li.menu-item-has-children' when the focus is on the 'a' element.
 	focusMenuWithChildren: function() {
 		// Get all the link elements within the primary menu.
 		var links, i, len,
 			menu = document.querySelector( '.primary-menu-wrapper' );
 
 		if ( ! menu ) {
 			return false;
 		}
 
 		links = menu.getElementsByTagName( 'a' );
 
 		// Each time a menu link is focused or blurred, toggle focus.
 		for ( i = 0, len = links.length; i < len; i++ ) {
 			links[i].addEventListener( 'focus', toggleFocus, true );
 			links[i].addEventListener( 'blur', toggleFocus, true );
 		}
 
 		//Sets or removes the .focus class on an element.
 		function toggleFocus() {
 			var self = this;
 
 			// Move up through the ancestors of the current link until we hit .primary-menu.
 			while ( -1 === self.className.indexOf( 'primary-menu' ) ) {
 				// On li elements toggle the class .focus.
 				if ( 'li' === self.tagName.toLowerCase() ) {
 					if ( -1 !== self.className.indexOf( 'focus' ) ) {
 						self.className = self.className.replace( ' focus', '' );
 					} else {
 						self.className += ' focus';
 					}
 				}
 				self = self.parentElement;
 			}
 		}
 	}
 }; // twentytwenty.primaryMenu
 
 /*	-----------------------------------------------------------------------------------------------
 	Toggles
 --------------------------------------------------------------------------------------------------- */
 
 twentytwenty.toggles = {
 
 	clickedEl: false,
 
 	init: function() {
 		// Do the toggle.
 		this.toggle();
 
 		// Check for toggle/untoggle on resize.
 		this.resizeCheck();
 
 		// Check for untoggle on escape key press.
 		this.untoggleOnEscapeKeyPress();
 	},
 
 	performToggle: function( element, instantly ) {
 		var target, timeOutTime, classToToggle,
 			self = this,
 			_doc = document,
 			// Get our targets.
 			toggle = element,
 			targetString = toggle.dataset.toggleTarget,
 			activeClass = 'active';
 
 		// Elements to focus after modals are closed.
 		if ( ! _doc.querySelectorAll( '.show-modal' ).length ) {
 			self.clickedEl = _doc.activeElement;
 		}
 
 		if ( targetString === 'next' ) {
 			target = toggle.nextSibling;
 		} else {
 			target = _doc.querySelector( targetString );
 		}
 
 		// Trigger events on the toggle targets before they are toggled.
 		if ( target.classList.contains( activeClass ) ) {
 			target.dispatchEvent( twentytwenty.createEvent( 'toggle-target-before-active' ) );
 		} else {
 			target.dispatchEvent( twentytwenty.createEvent( 'toggle-target-before-inactive' ) );
 		}
 
 		// Get the class to toggle, if specified.
 		classToToggle = toggle.dataset.classToToggle ? toggle.dataset.classToToggle : activeClass;
 
 		// For cover modals, set a short timeout duration so the class animations have time to play out.
 		timeOutTime = 0;
 
 		if ( target.classList.contains( 'cover-modal' ) ) {
 			timeOutTime = 10;
 		}
 
 		setTimeout( function() {
 			var focusElement,
 				subMenued = target.classList.contains( 'sub-menu' ),
 				newTarget = subMenued ? toggle.closest( '.menu-item' ).querySelector( '.sub-menu' ) : target,
 				duration = toggle.dataset.toggleDuration;
 
 			// Toggle the target of the clicked toggle.
 			if ( toggle.dataset.toggleType === 'slidetoggle' && ! instantly && duration !== '0' ) {
 				twentytwentyMenuToggle( newTarget, duration );
 			} else {
 				newTarget.classList.toggle( classToToggle );
 			}
 
 			// If the toggle target is 'next', only give the clicked toggle the active class.
 			if ( targetString === 'next' ) {
 				toggle.classList.toggle( activeClass );
 			} else if ( target.classList.contains( 'sub-menu' ) ) {
 				toggle.classList.toggle( activeClass );
 			} else {
 				// If not, toggle all toggles with this toggle target.
 				_doc.querySelector( '*[data-toggle-target="' + targetString + '"]' ).classList.toggle( activeClass );
 			}
 
 			// Toggle aria-expanded on the toggle.
 			twentytwentyToggleAttribute( toggle, 'aria-expanded', 'true', 'false' );
 
 			if ( self.clickedEl && -1 !== toggle.getAttribute( 'class' ).indexOf( 'close-' ) ) {
 				twentytwentyToggleAttribute( self.clickedEl, 'aria-expanded', 'true', 'false' );
 			}
 
 			// Toggle body class.
 			if ( toggle.dataset.toggleBodyClass ) {
 				_doc.body.classList.toggle( toggle.dataset.toggleBodyClass );
 			}
 
 			// Check whether to set focus.
 			if ( toggle.dataset.setFocus ) {
 				focusElement = _doc.querySelector( toggle.dataset.setFocus );
 
 				if ( focusElement ) {
 					if ( target.classList.contains( activeClass ) ) {
 						focusElement.focus();
 					} else {
 						focusElement.blur();
 					}
 				}
 			}
 
 			// Trigger the toggled event on the toggle target.
 			target.dispatchEvent( twentytwenty.createEvent( 'toggled' ) );
 
 			// Trigger events on the toggle targets after they are toggled.
 			if ( target.classList.contains( activeClass ) ) {
 				target.dispatchEvent( twentytwenty.createEvent( 'toggle-target-after-active' ) );
 			} else {
 				target.dispatchEvent( twentytwenty.createEvent( 'toggle-target-after-inactive' ) );
 			}
 		}, timeOutTime );
 	},
 
 	// Do the toggle.
 	toggle: function() {
 		var self = this;
 
 		document.querySelectorAll( '*[data-toggle-target]' ).forEach( function( element ) {
 			element.addEventListener( 'click', function( event ) {
 				event.preventDefault();
 				self.performToggle( element );
 			} );
 		} );
 	},
 
 	// Check for toggle/untoggle on screen resize.
 	resizeCheck: function() {
 		if ( document.querySelectorAll( '*[data-untoggle-above], *[data-untoggle-below], *[data-toggle-above], *[data-toggle-below]' ).length ) {
 			window.addEventListener( 'resize', function() {
 				var winWidth = window.innerWidth,
 					toggles = document.querySelectorAll( '.toggle' );
 
 				toggles.forEach( function( toggle ) {
 					var unToggleAbove = toggle.dataset.untoggleAbove,
 						unToggleBelow = toggle.dataset.untoggleBelow,
 						toggleAbove = toggle.dataset.toggleAbove,
 						toggleBelow = toggle.dataset.toggleBelow;
 
 					// If no width comparison is set, continue.
 					if ( ! unToggleAbove && ! unToggleBelow && ! toggleAbove && ! toggleBelow ) {
 						return;
 					}
 
 					// If the toggle width comparison is true, toggle the toggle.
 					if (
 						( ( ( unToggleAbove && winWidth > unToggleAbove ) ||
 							( unToggleBelow && winWidth < unToggleBelow ) ) &&
 							toggle.classList.contains( 'active' ) ) ||
 						( ( ( toggleAbove && winWidth > toggleAbove ) ||
 							( toggleBelow && winWidth < toggleBelow ) ) &&
 							! toggle.classList.contains( 'active' ) )
 					) {
 						toggle.click();
 					}
 				} );
 			} );
 		}
 	},
 
 	// Close toggle on escape key press.
 	untoggleOnEscapeKeyPress: function() {
 		document.addEventListener( 'keyup', function( event ) {
 			if ( event.key === 'Escape' ) {
 				document.querySelectorAll( '*[data-untoggle-on-escape].active' ).forEach( function( element ) {
 					if ( element.classList.contains( 'active' ) ) {
 						element.click();
 					}
 				} );
 			}
 		} );
 	}
 
 }; // twentytwenty.toggles
 
 /**
  * Is the DOM ready?
  *
  * This implementation is coming from https://gomakethings.com/a-native-javascript-equivalent-of-jquerys-ready-method/
  *
  * @since Twenty Twenty 1.0
  *
  * @param {Function} fn Callback function to run.
  */
 function twentytwentyDomReady( fn ) {
 	if ( typeof fn !== 'function' ) {
 		return;
 	}
 
 	if ( document.readyState === 'interactive' || document.readyState === 'complete' ) {
 		return fn();
 	}
 
 	document.addEventListener( 'DOMContentLoaded', fn, false );
 }
 
 twentytwentyDomReady( function() {
 	twentytwenty.toggles.init();              // Handle toggles.
 	twentytwenty.coverModals.init();          // Handle cover modals.
 	twentytwenty.intrinsicRatioVideos.init(); // Retain aspect ratio of videos on window resize.
 	twentytwenty.modalMenu.init();            // Modal Menu.
 	twentytwenty.primaryMenu.init();          // Primary Menu.
 	twentytwenty.touchEnabled.init();         // Add class to body if device is touch-enabled.
 } );
 
 /*	-----------------------------------------------------------------------------------------------
 	Helper functions
 --------------------------------------------------------------------------------------------------- */
 
 /* Toggle an attribute ----------------------- */
 
 function twentytwentyToggleAttribute( element, attribute, trueVal, falseVal ) {
 	if ( element.classList.contains( 'close-search-toggle' ) ) {
 		return;
 	}
 	if ( trueVal === undefined ) {
 		trueVal = true;
 	}
 	if ( falseVal === undefined ) {
 		falseVal = false;
 	}
 	if ( element.getAttribute( attribute ) !== trueVal ) {
 		element.setAttribute( attribute, trueVal );
 	} else {
 		element.setAttribute( attribute, falseVal );
 	}
 }
 
 /**
  * Toggle a menu item on or off.
  *
  * @since Twenty Twenty 1.0
  *
  * @param {HTMLElement} target
  * @param {number} duration
  */
 function twentytwentyMenuToggle( target, duration ) {
 	var initialParentHeight, finalParentHeight, menu, menuItems, transitionListener,
 		initialPositions = [],
 		finalPositions = [];
 
 	if ( ! target ) {
 		return;
 	}
 
 	menu = target.closest( '.menu-wrapper' );
 
 	// Step 1: look at the initial positions of every menu item.
 	menuItems = menu.querySelectorAll( '.menu-item' );
 
 	menuItems.forEach( function( menuItem, index ) {
 		initialPositions[ index ] = { x: menuItem.offsetLeft, y: menuItem.offsetTop };
 	} );
 	initialParentHeight = target.parentElement.offsetHeight;
 
 	target.classList.add( 'toggling-target' );
 
 	// Step 2: toggle target menu item and look at the final positions of every menu item.
 	target.classList.toggle( 'active' );
 
 	menuItems.forEach( function( menuItem, index ) {
 		finalPositions[ index ] = { x: menuItem.offsetLeft, y: menuItem.offsetTop };
 	} );
 	finalParentHeight = target.parentElement.offsetHeight;
 
 	// Step 3: close target menu item again.
 	// The whole process happens without giving the browser a chance to render, so it's invisible.
 	target.classList.toggle( 'active' );
 
 	/*
 	 * Step 4: prepare animation.
 	 * Position all the items with absolute offsets, at the same starting position.
 	 * Shouldn't result in any visual changes if done right.
 	 */
 	menu.classList.add( 'is-toggling' );
 	target.classList.toggle( 'active' );
 	menuItems.forEach( function( menuItem, index ) {
 		var initialPosition = initialPositions[ index ];
 		if ( initialPosition.y === 0 && menuItem.parentElement === target ) {
 			initialPosition.y = initialParentHeight;
 		}
 		menuItem.style.transform = 'translate(' + initialPosition.x + 'px, ' + initialPosition.y + 'px)';
 	} );
 
 	/*
 	 * The double rAF is unfortunately needed, since we're toggling CSS classes, and
 	 * the only way to ensure layout completion here across browsers is to wait twice.
 	 * This just delays the start of the animation by 2 frames and is thus not an issue.
 	 */
 	requestAnimationFrame( function() {
 		requestAnimationFrame( function() {
 			/*
 			 * Step 5: start animation by moving everything to final position.
 			 * All the layout work has already happened, while we were preparing for the animation.
 			 * The animation now runs entirely in CSS, using cheap CSS properties (opacity and transform)
 			 * that don't trigger the layout or paint stages.
 			 */
 			menu.classList.add( 'is-animating' );
 			menuItems.forEach( function( menuItem, index ) {
 				var finalPosition = finalPositions[ index ];
 				if ( finalPosition.y === 0 && menuItem.parentElement === target ) {
 					finalPosition.y = finalParentHeight;
 				}
 				if ( duration !== undefined ) {
 					menuItem.style.transitionDuration = duration + 'ms';
 				}
 				menuItem.style.transform = 'translate(' + finalPosition.x + 'px, ' + finalPosition.y + 'px)';
 			} );
 			if ( duration !== undefined ) {
 				target.style.transitionDuration = duration + 'ms';
 			}
 		} );
 
 		// Step 6: finish toggling.
 		// Remove all transient classes when the animation ends.
 		transitionListener = function() {
 			menu.classList.remove( 'is-animating' );
 			menu.classList.remove( 'is-toggling' );
 			target.classList.remove( 'toggling-target' );
 			menuItems.forEach( function( menuItem ) {
 				menuItem.style.transform = '';
 				menuItem.style.transitionDuration = '';
 			} );
 			target.style.transitionDuration = '';
 			target.removeEventListener( 'transitionend', transitionListener );
 		};
 
 		target.addEventListener( 'transitionend', transitionListener );
 	} );
 }
 
 /**
  * Traverses the DOM up to find elements matching the query.
  *
  * @since Twenty Twenty 1.0
  *
  * @param {HTMLElement} target
  * @param {string} query
  * @return {NodeList} parents matching query
  */
 function twentytwentyFindParents( target, query ) {
 	var parents = [];
 
 	// Recursively go up the DOM adding matches to the parents array.
 	function traverse( item ) {
 		var parent = item.parentNode;
 		if ( parent instanceof HTMLElement ) {
 			if ( parent.matches( query ) ) {
 				parents.push( parent );
 			}
 			traverse( parent );
 		}
 	}
 
 	traverse( target );
 
 	return parents;
 }