(function(global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
		typeof define === 'function' && define.amd ? define(factory) :
		(global = global || self, global.Sortable = factory());
}(this, function() {
	'use strict';

	function _typeof(obj) {
		if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
			_typeof = function(obj) {
				return typeof obj;
			};
		} else {
			_typeof = function(obj) {
				return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol
					.prototype ? "symbol" : typeof obj;
			};
		}

		return _typeof(obj);
	}

	function _defineProperty(obj, key, value) {
		if (key in obj) {
			Object.defineProperty(obj, key, {
				value: value,
				enumerable: true,
				configurable: true,
				writable: true
			});
		} else {
			obj[key] = value;
		}

		return obj;
	}

	function _extends() {
		_extends = Object.assign || function(target) {
			for (var i = 1; i < arguments.length; i++) {
				var source = arguments[i];

				for (var key in source) {
					if (Object.prototype.hasOwnProperty.call(source, key)) {
						target[key] = source[key];
					}
				}
			}

			return target;
		};

		return _extends.apply(this, arguments);
	}

	function _objectSpread(target) {
		for (var i = 1; i < arguments.length; i++) {
			var source = arguments[i] != null ? arguments[i] : {};
			var ownKeys = Object.keys(source);

			if (typeof Object.getOwnPropertySymbols === 'function') {
				ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function(sym) {
					return Object.getOwnPropertyDescriptor(source, sym).enumerable;
				}));
			}

			ownKeys.forEach(function(key) {
				_defineProperty(target, key, source[key]);
			});
		}

		return target;
	}

	function _objectWithoutPropertiesLoose(source, excluded) {
		if (source == null) return {};
		var target = {};
		var sourceKeys = Object.keys(source);
		var key, i;

		for (i = 0; i < sourceKeys.length; i++) {
			key = sourceKeys[i];
			if (excluded.indexOf(key) >= 0) continue;
			target[key] = source[key];
		}

		return target;
	}

	function _objectWithoutProperties(source, excluded) {
		if (source == null) return {};

		var target = _objectWithoutPropertiesLoose(source, excluded);

		var key, i;

		if (Object.getOwnPropertySymbols) {
			var sourceSymbolKeys = Object.getOwnPropertySymbols(source);

			for (i = 0; i < sourceSymbolKeys.length; i++) {
				key = sourceSymbolKeys[i];
				if (excluded.indexOf(key) >= 0) continue;
				if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;
				target[key] = source[key];
			}
		}

		return target;
	}

	function _toConsumableArray(arr) {
		return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
	}

	function _arrayWithoutHoles(arr) {
		if (Array.isArray(arr)) {
			for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];

			return arr2;
		}
	}

	function _iterableToArray(iter) {
		if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]")
			return Array.from(iter);
	}

	function _nonIterableSpread() {
		throw new TypeError("Invalid attempt to spread non-iterable instance");
	}

	var version = "1.10.2";

	function userAgent(pattern) {
		if (typeof window !== 'undefined' && window.navigator) {
			return !!
				/*@__PURE__*/
				navigator.userAgent.match(pattern);
		}
	}

	var IE11OrLess = userAgent(/(?:Trident.*rv[ :]?11\.|msie|iemobile|Windows Phone)/i);
	var Edge = userAgent(/Edge/i);
	var FireFox = userAgent(/firefox/i);
	var Safari = userAgent(/safari/i) && !userAgent(/chrome/i) && !userAgent(/android/i);
	var IOS = userAgent(/iP(ad|od|hone)/i);
	var ChromeForAndroid = userAgent(/chrome/i) && userAgent(/android/i);

	var captureMode = {
		capture: false,
		passive: false
	};

	function on(el, event, fn) {
		el.addEventListener(event, fn, !IE11OrLess && captureMode);
	}

	function off(el, event, fn) {
		el.removeEventListener(event, fn, !IE11OrLess && captureMode);
	}

	function matches(
		/**HTMLElement*/
		el,
		/**String*/
		selector) {
		if (!selector) return;
		selector[0] === '>' && (selector = selector.substring(1));

		if (el) {
			try {
				if (el.matches) {
					return el.matches(selector);
				} else if (el.msMatchesSelector) {
					return el.msMatchesSelector(selector);
				} else if (el.webkitMatchesSelector) {
					return el.webkitMatchesSelector(selector);
				}
			} catch (_) {
				return false;
			}
		}

		return false;
	}

	function getParentOrHost(el) {
		return el.host && el !== document && el.host.nodeType ? el.host : el.parentNode;
	}

	function closest(
		/**HTMLElement*/
		el,
		/**String*/
		selector,
		/**HTMLElement*/
		ctx, includeCTX) {
		if (el) {
			ctx = ctx || document;

			do {
				if (selector != null && (selector[0] === '>' ? el.parentNode === ctx && matches(el, selector) :
						matches(el, selector)) || includeCTX && el === ctx) {
					return el;
				}

				if (el === ctx) break;
				/* jshint boss:true */
			} while (el = getParentOrHost(el));
		}

		return null;
	}

	var R_SPACE = /\s+/g;

	function toggleClass(el, name, state) {
		if (el && name) {
			if (el.classList) {
				el.classList[state ? 'add' : 'remove'](name);
			} else {
				var className = (' ' + el.className + ' ').replace(R_SPACE, ' ').replace(' ' + name + ' ', ' ');
				el.className = (className + (state ? ' ' + name : '')).replace(R_SPACE, ' ');
			}
		}
	}

	function css(el, prop, val) {
		var style = el && el.style;

		if (style) {
			if (val === void 0) {
				if (document.defaultView && document.defaultView.getComputedStyle) {
					val = document.defaultView.getComputedStyle(el, '');
				} else if (el.currentStyle) {
					val = el.currentStyle;
				}

				return prop === void 0 ? val : val[prop];
			} else {
				if (!(prop in style) && prop.indexOf('webkit') === -1) {
					prop = '-webkit-' + prop;
				}

				style[prop] = val + (typeof val === 'string' ? '' : 'px');
			}
		}
	}

	function matrix(el, selfOnly) {
		var appliedTransforms = '';

		if (typeof el === 'string') {
			appliedTransforms = el;
		} else {
			do {
				var transform = css(el, 'transform');

				if (transform && transform !== 'none') {
					appliedTransforms = transform + ' ' + appliedTransforms;
				}
				/* jshint boss:true */

			} while (!selfOnly && (el = el.parentNode));
		}

		var matrixFn = window.DOMMatrix || window.WebKitCSSMatrix || window.CSSMatrix || window.MSCSSMatrix;
		/*jshint -W056 */

		return matrixFn && new matrixFn(appliedTransforms);
	}

	function find(ctx, tagName, iterator) {
		if (ctx) {
			var list = ctx.getElementsByTagName(tagName),
				i = 0,
				n = list.length;

			if (iterator) {
				for (; i < n; i++) {
					iterator(list[i], i);
				}
			}

			return list;
		}

		return [];
	}

	function getWindowScrollingElement() {
		var scrollingElement = document.scrollingElement;

		if (scrollingElement) {
			return scrollingElement;
		} else {
			return document.documentElement;
		}
	}
	/**
	 * Returns the "bounding client rect" of given element
	 * @param  {HTMLElement} el                       The element whose boundingClientRect is wanted
	 * @param  {[Boolean]} relativeToContainingBlock  Whether the rect should be relative to the containing block of (including) the container
	 * @param  {[Boolean]} relativeToNonStaticParent  Whether the rect should be relative to the relative parent of (including) the contaienr
	 * @param  {[Boolean]} undoScale                  Whether the container's scale() should be undone
	 * @param  {[HTMLElement]} container              The parent the element will be placed in
	 * @return {Object}                               The boundingClientRect of el, with specified adjustments
	 */


	function getRect(el, relativeToContainingBlock, relativeToNonStaticParent, undoScale, container) {
		if (!el.getBoundingClientRect && el !== window) return;
		var elRect, top, left, bottom, right, height, width;

		if (el !== window && el !== getWindowScrollingElement()) {
			elRect = el.getBoundingClientRect();
			top = elRect.top;
			left = elRect.left;
			bottom = elRect.bottom;
			right = elRect.right;
			height = elRect.height;
			width = elRect.width;
		} else {
			top = 0;
			left = 0;
			bottom = window.innerHeight;
			right = window.innerWidth;
			height = window.innerHeight;
			width = window.innerWidth;
		}

		if ((relativeToContainingBlock || relativeToNonStaticParent) && el !== window) {
			// Adjust for translate()
			container = container || el
				.parentNode; // solves #1123 (see: https://stackoverflow.com/a/37953806/6088312)
			// Not needed on <= IE11

			if (!IE11OrLess) {
				do {
					if (container && container.getBoundingClientRect && (css(container, 'transform') !==
							'none' || relativeToNonStaticParent && css(container, 'position') !== 'static')) {
						var containerRect = container
							.getBoundingClientRect(); // Set relative to edges of padding box of container

						top -= containerRect.top + parseInt(css(container, 'border-top-width'));
						left -= containerRect.left + parseInt(css(container, 'border-left-width'));
						bottom = top + elRect.height;
						right = left + elRect.width;
						break;
					}
					/* jshint boss:true */

				} while (container = container.parentNode);
			}
		}

		if (undoScale && el !== window) {
			// Adjust for scale()
			var elMatrix = matrix(container || el),
				scaleX = elMatrix && elMatrix.a,
				scaleY = elMatrix && elMatrix.d;

			if (elMatrix) {
				top /= scaleY;
				left /= scaleX;
				width /= scaleX;
				height /= scaleY;
				bottom = top + height;
				right = left + width;
			}
		}

		return {
			top: top,
			left: left,
			bottom: bottom,
			right: right,
			width: width,
			height: height
		};
	}
	/**
	 * Checks if a side of an element is scrolled past a side of its parents
	 * @param  {HTMLElement}  el           The element who's side being scrolled out of view is in question
	 * @param  {String}       elSide       Side of the element in question ('top', 'left', 'right', 'bottom')
	 * @param  {String}       parentSide   Side of the parent in question ('top', 'left', 'right', 'bottom')
	 * @return {HTMLElement}               The parent scroll element that the el's side is scrolled past, or null if there is no such element
	 */


	function isScrolledPast(el, elSide, parentSide) {
		var parent = getParentAutoScrollElement(el, true),
			elSideVal = getRect(el)[elSide];
		/* jshint boss:true */

		while (parent) {
			var parentSideVal = getRect(parent)[parentSide],
				visible = void 0;

			if (parentSide === 'top' || parentSide === 'left') {
				visible = elSideVal >= parentSideVal;
			} else {
				visible = elSideVal <= parentSideVal;
			}

			if (!visible) return parent;
			if (parent === getWindowScrollingElement()) break;
			parent = getParentAutoScrollElement(parent, false);
		}

		return false;
	}
	/**
	 * Gets nth child of el, ignoring hidden children, sortable's elements (does not ignore clone if it's visible)
	 * and non-draggable elements
	 * @param  {HTMLElement} el       The parent element
	 * @param  {Number} childNum      The index of the child
	 * @param  {Object} options       Parent Sortable's options
	 * @return {HTMLElement}          The child at index childNum, or null if not found
	 */


	function getChild(el, childNum, options) {
		var currentChild = 0,
			i = 0,
			children = el.children;

		while (i < children.length) {
			if (children[i].style.display !== 'none' && children[i] !== Sortable.ghost && children[i] !==
				Sortable.dragged && closest(children[i], options.draggable, el, false)) {
				if (currentChild === childNum) {
					return children[i];
				}

				currentChild++;
			}

			i++;
		}

		return null;
	}
	/**
	 * Gets the last child in the el, ignoring ghostEl or invisible elements (clones)
	 * @param  {HTMLElement} el       Parent element
	 * @param  {selector} selector    Any other elements that should be ignored
	 * @return {HTMLElement}          The last child, ignoring ghostEl
	 */


	function lastChild(el, selector) {
		var last = el.lastElementChild;

		while (last && (last === Sortable.ghost || css(last, 'display') === 'none' || selector && !matches(last,
				selector))) {
			last = last.previousElementSibling;
		}

		return last || null;
	}
	/**
	 * Returns the index of an element within its parent for a selected set of
	 * elements
	 * @param  {HTMLElement} el
	 * @param  {selector} selector
	 * @return {number}
	 */


	function index(el, selector) {
		var index = 0;

		if (!el || !el.parentNode) {
			return -1;
		}
		/* jshint boss:true */


		while (el = el.previousElementSibling) {
			if (el.nodeName.toUpperCase() !== 'TEMPLATE' && el !== Sortable.clone && (!selector || matches(el,
					selector))) {
				index++;
			}
		}

		return index;
	}
	/**
	 * Returns the scroll offset of the given element, added with all the scroll offsets of parent elements.
	 * The value is returned in real pixels.
	 * @param  {HTMLElement} el
	 * @return {Array}             Offsets in the format of [left, top]
	 */


	function getRelativeScrollOffset(el) {
		var offsetLeft = 0,
			offsetTop = 0,
			winScroller = getWindowScrollingElement();

		if (el) {
			do {
				var elMatrix = matrix(el),
					scaleX = elMatrix.a,
					scaleY = elMatrix.d;
				offsetLeft += el.scrollLeft * scaleX;
				offsetTop += el.scrollTop * scaleY;
			} while (el !== winScroller && (el = el.parentNode));
		}

		return [offsetLeft, offsetTop];
	}
	/**
	 * Returns the index of the object within the given array
	 * @param  {Array} arr   Array that may or may not hold the object
	 * @param  {Object} obj  An object that has a key-value pair unique to and identical to a key-value pair in the object you want to find
	 * @return {Number}      The index of the object in the array, or -1
	 */


	function indexOfObject(arr, obj) {
		for (var i in arr) {
			if (!arr.hasOwnProperty(i)) continue;

			for (var key in obj) {
				if (obj.hasOwnProperty(key) && obj[key] === arr[i][key]) return Number(i);
			}
		}

		return -1;
	}

	function getParentAutoScrollElement(el, includeSelf) {
		// skip to window
		if (!el || !el.getBoundingClientRect) return getWindowScrollingElement();
		var elem = el;
		var gotSelf = false;

		do {
			// we don't need to get elem css if it isn't even overflowing in the first place (performance)
			if (elem.clientWidth < elem.scrollWidth || elem.clientHeight < elem.scrollHeight) {
				var elemCSS = css(elem);

				if (elem.clientWidth < elem.scrollWidth && (elemCSS.overflowX == 'auto' || elemCSS.overflowX ==
						'scroll') || elem.clientHeight < elem.scrollHeight && (elemCSS.overflowY == 'auto' ||
						elemCSS.overflowY == 'scroll')) {
					if (!elem.getBoundingClientRect || elem === document.body)
						return getWindowScrollingElement();
					if (gotSelf || includeSelf) return elem;
					gotSelf = true;
				}
			}
			/* jshint boss:true */

		} while (elem = elem.parentNode);

		return getWindowScrollingElement();
	}

	function extend(dst, src) {
		if (dst && src) {
			for (var key in src) {
				if (src.hasOwnProperty(key)) {
					dst[key] = src[key];
				}
			}
		}

		return dst;
	}

	function isRectEqual(rect1, rect2) {
		return Math.round(rect1.top) === Math.round(rect2.top) && Math.round(rect1.left) === Math.round(rect2
				.left) && Math.round(rect1.height) === Math.round(rect2.height) && Math.round(rect1.width) ===
			Math.round(rect2.width);
	}

	var _throttleTimeout;

	function throttle(callback, ms) {
		return function() {
			if (!_throttleTimeout) {
				var args = arguments,
					_this = this;

				if (args.length === 1) {
					callback.call(_this, args[0]);
				} else {
					callback.apply(_this, args);
				}

				_throttleTimeout = setTimeout(function() {
					_throttleTimeout = void 0;
				}, ms);
			}
		};
	}

	function cancelThrottle() {
		clearTimeout(_throttleTimeout);
		_throttleTimeout = void 0;
	}

	function scrollBy(el, x, y) {
		el.scrollLeft += x;
		el.scrollTop += y;
	}

	function clone(el) {
		var Polymer = window.Polymer;
		var $ = window.jQuery || window.Zepto;

		if (Polymer && Polymer.dom) {
			return Polymer.dom(el).cloneNode(true);
		} else if ($) {
			return $(el).clone(true)[0];
		} else {
			return el.cloneNode(true);
		}
	}

	function setRect(el, rect) {
		css(el, 'position', 'absolute');
		css(el, 'top', rect.top);
		css(el, 'left', rect.left);
		css(el, 'width', rect.width);
		css(el, 'height', rect.height);
	}

	function unsetRect(el) {
		css(el, 'position', '');
		css(el, 'top', '');
		css(el, 'left', '');
		css(el, 'width', '');
		css(el, 'height', '');
	}

	var expando = 'Sortable' + new Date().getTime();

	function AnimationStateManager() {
		var animationStates = [],
			animationCallbackId;
		return {
			captureAnimationState: function captureAnimationState() {
				animationStates = [];
				if (!this.options.animation) return;
				var children = [].slice.call(this.el.children);
				children.forEach(function(child) {
					if (css(child, 'display') === 'none' || child === Sortable.ghost) return;
					animationStates.push({
						target: child,
						rect: getRect(child)
					});

					var fromRect = _objectSpread({}, animationStates[animationStates.length - 1]
						.rect); // If animating: compensate for current animation


					if (child.thisAnimationDuration) {
						var childMatrix = matrix(child, true);

						if (childMatrix) {
							fromRect.top -= childMatrix.f;
							fromRect.left -= childMatrix.e;
						}
					}

					child.fromRect = fromRect;
				});
			},
			addAnimationState: function addAnimationState(state) {
				animationStates.push(state);
			},
			removeAnimationState: function removeAnimationState(target) {
				animationStates.splice(indexOfObject(animationStates, {
					target: target
				}), 1);
			},
			animateAll: function animateAll(callback) {
				var _this = this;

				if (!this.options.animation) {
					clearTimeout(animationCallbackId);
					if (typeof callback === 'function') callback();
					return;
				}

				var animating = false,
					animationTime = 0;
				animationStates.forEach(function(state) {
					var time = 0,
						target = state.target,
						fromRect = target.fromRect,
						toRect = getRect(target),
						prevFromRect = target.prevFromRect,
						prevToRect = target.prevToRect,
						animatingRect = state.rect,
						targetMatrix = matrix(target, true);

					if (targetMatrix) {
						// Compensate for current animation
						toRect.top -= targetMatrix.f;
						toRect.left -= targetMatrix.e;
					}

					target.toRect = toRect;

					if (target.thisAnimationDuration) {
						// Could also check if animatingRect is between fromRect and toRect
						if (isRectEqual(prevFromRect, toRect) && !isRectEqual(fromRect, toRect) &&
							// Make sure animatingRect is on line between toRect & fromRect
							(animatingRect.top - toRect.top) / (animatingRect.left - toRect
								.left) === (fromRect.top - toRect.top) / (fromRect.left - toRect
								.left)
						) {
							// If returning to same place as started from animation and on same axis
							time = calculateRealTime(animatingRect, prevFromRect, prevToRect, _this
								.options);
						}
					} // if fromRect != toRect: animate


					if (!isRectEqual(toRect, fromRect)) {
						target.prevFromRect = fromRect;
						target.prevToRect = toRect;

						if (!time) {
							time = _this.options.animation;
						}

						_this.animate(target, animatingRect, toRect, time);
					}

					if (time) {
						animating = true;
						animationTime = Math.max(animationTime, time);
						clearTimeout(target.animationResetTimer);
						target.animationResetTimer = setTimeout(function() {
							target.animationTime = 0;
							target.prevFromRect = null;
							target.fromRect = null;
							target.prevToRect = null;
							target.thisAnimationDuration = null;
						}, time);
						target.thisAnimationDuration = time;
					}
				});
				clearTimeout(animationCallbackId);

				if (!animating) {
					if (typeof callback === 'function') callback();
				} else {
					animationCallbackId = setTimeout(function() {
						if (typeof callback === 'function') callback();
					}, animationTime);
				}

				animationStates = [];
			},
			animate: function animate(target, currentRect, toRect, duration) {
				if (duration) {
					css(target, 'transition', '');
					css(target, 'transform', '');
					var elMatrix = matrix(this.el),
						scaleX = elMatrix && elMatrix.a,
						scaleY = elMatrix && elMatrix.d,
						translateX = (currentRect.left - toRect.left) / (scaleX || 1),
						translateY = (currentRect.top - toRect.top) / (scaleY || 1);
					target.animatingX = !!translateX;
					target.animatingY = !!translateY;
					css(target, 'transform', 'translate3d(' + translateX + 'px,' + translateY + 'px,0)');
					repaint(target); // repaint

					css(target, 'transition', 'transform ' + duration + 'ms' + (this.options.easing ? ' ' +
						this.options.easing : ''));
					css(target, 'transform', 'translate3d(0,0,0)');
					typeof target.animated === 'number' && clearTimeout(target.animated);
					target.animated = setTimeout(function() {
						css(target, 'transition', '');
						css(target, 'transform', '');
						target.animated = false;
						target.animatingX = false;
						target.animatingY = false;
					}, duration);
				}
			}
		};
	}

	function repaint(target) {
		return target.offsetWidth;
	}

	function calculateRealTime(animatingRect, fromRect, toRect, options) {
		return Math.sqrt(Math.pow(fromRect.top - animatingRect.top, 2) + Math.pow(fromRect.left - animatingRect
			.left, 2)) / Math.sqrt(Math.pow(fromRect.top - toRect.top, 2) + Math.pow(fromRect.left - toRect
			.left, 2)) * options.animation;
	}

	var plugins = [];
	var defaults = {
		initializeByDefault: true
	};

	function dispatchEvent(_ref) {
		var sortable = _ref.sortable,
			rootEl = _ref.rootEl,
			name = _ref.name,
			targetEl = _ref.targetEl,
			cloneEl = _ref.cloneEl,
			toEl = _ref.toEl,
			fromEl = _ref.fromEl,
			oldIndex = _ref.oldIndex,
			newIndex = _ref.newIndex,
			oldDraggableIndex = _ref.oldDraggableIndex,
			newDraggableIndex = _ref.newDraggableIndex,
			originalEvent = _ref.originalEvent,
			putSortable = _ref.putSortable,
			extraEventProperties = _ref.extraEventProperties;
		sortable = sortable || rootEl && rootEl[expando];
		if (!sortable) return;
		var evt,
			options = sortable.options,
			onName = 'on' + name.charAt(0).toUpperCase() + name.substr(
				1); // Support for new CustomEvent feature

		if (window.CustomEvent && !IE11OrLess && !Edge) {
			evt = new CustomEvent(name, {
				bubbles: true,
				cancelable: true
			});
		} else {
			evt = document.createEvent('Event');
			evt.initEvent(name, true, true);
		}

		evt.to = toEl || rootEl;
		evt.from = fromEl || rootEl;
		evt.item = targetEl || rootEl;
		evt.clone = cloneEl;
		evt.oldIndex = oldIndex;
		evt.newIndex = newIndex;
		evt.oldDraggableIndex = oldDraggableIndex;
		evt.newDraggableIndex = newDraggableIndex;
		evt.originalEvent = originalEvent;
		evt.pullMode = putSortable ? putSortable.lastPutMode : undefined;

		var allEventProperties = _objectSpread({}, extraEventProperties);

		for (var option in allEventProperties) {
			evt[option] = allEventProperties[option];
		}

		if (rootEl) {
			rootEl.dispatchEvent(evt);
		}

		if (options[onName]) {
			options[onName].call(sortable, evt);
		}
	}

	function _dispatchEvent(info) {
		dispatchEvent(_objectSpread({
			putSortable: putSortable,
			cloneEl: cloneEl,
			targetEl: dragEl,
			rootEl: rootEl,
			oldIndex: oldIndex,
			oldDraggableIndex: oldDraggableIndex,
			newIndex: newIndex,
			newDraggableIndex: newDraggableIndex
		}, info));
	}

	var dragEl,
		parentEl,
		ghostEl,
		rootEl,
		nextEl,
		lastDownEl,
		cloneEl,
		cloneHidden,
		oldIndex,
		newIndex,
		oldDraggableIndex,
		newDraggableIndex,
		activeGroup,
		putSortable,
		awaitingDragStarted = false,
		ignoreNextClick = false,
		sortables = [],
		tapEvt,
		touchEvt,
		lastDx,
		lastDy,
		tapDistanceLeft,
		tapDistanceTop,
		moved,
		lastTarget,
		lastDirection,
		pastFirstInvertThresh = false,
		isCircumstantialInvert = false,
		targetMoveDistance,
		// For positioning ghost absolutely
		ghostRelativeParent,
		ghostRelativeParentInitialScroll = [],
		// (left, top)
		_silent = false,
		savedInputChecked = [];
	/** @const */

	var documentExists = typeof document !== 'undefined',
		PositionGhostAbsolutely = IOS,
		CSSFloatProperty = Edge || IE11OrLess ? 'cssFloat' : 'float',
		// This will not pass for IE9, because IE9 DnD only works on anchors
		supportDraggable = documentExists && !ChromeForAndroid && !IOS && 'draggable' in document.createElement(
			'div'),
		supportCssPointerEvents = function() {
			if (!documentExists) return; // false when <= IE11

			if (IE11OrLess) {
				return false;
			}

			var el = document.createElement('x');
			el.style.cssText = 'pointer-events:auto';
			return el.style.pointerEvents === 'auto';
		}(),
		_detectDirection = function _detectDirection(el, options) {
			var elCSS = css(el),
				elWidth = parseInt(elCSS.width) - parseInt(elCSS.paddingLeft) - parseInt(elCSS.paddingRight) -
				parseInt(elCSS.borderLeftWidth) - parseInt(elCSS.borderRightWidth),
				child1 = getChild(el, 0, options),
				child2 = getChild(el, 1, options),
				firstChildCSS = child1 && css(child1),
				secondChildCSS = child2 && css(child2),
				firstChildWidth = firstChildCSS && parseInt(firstChildCSS.marginLeft) + parseInt(firstChildCSS
					.marginRight) + getRect(child1).width,
				secondChildWidth = secondChildCSS && parseInt(secondChildCSS.marginLeft) + parseInt(
					secondChildCSS.marginRight) + getRect(child2).width;

			if (elCSS.display === 'flex') {
				return elCSS.flexDirection === 'column' || elCSS.flexDirection === 'column-reverse' ?
					'vertical' : 'horizontal';
			}

			if (elCSS.display === 'grid') {
				return elCSS.gridTemplateColumns.split(' ').length <= 1 ? 'vertical' : 'horizontal';
			}

			if (child1 && firstChildCSS["float"] && firstChildCSS["float"] !== 'none') {
				var touchingSideChild2 = firstChildCSS["float"] === 'left' ? 'left' : 'right';
				return child2 && (secondChildCSS.clear === 'both' || secondChildCSS.clear ===
					touchingSideChild2) ? 'vertical' : 'horizontal';
			}

			return child1 && (firstChildCSS.display === 'block' || firstChildCSS.display === 'flex' ||
				firstChildCSS.display === 'table' || firstChildCSS.display === 'grid' || firstChildWidth >=
				elWidth && elCSS[CSSFloatProperty] === 'none' || child2 && elCSS[CSSFloatProperty] ===
				'none' && firstChildWidth + secondChildWidth > elWidth) ? 'vertical' : 'horizontal';
		},
		_dragElInRowColumn = function _dragElInRowColumn(dragRect, targetRect, vertical) {
			var dragElS1Opp = vertical ? dragRect.left : dragRect.top,
				dragElS2Opp = vertical ? dragRect.right : dragRect.bottom,
				dragElOppLength = vertical ? dragRect.width : dragRect.height,
				targetS1Opp = vertical ? targetRect.left : targetRect.top,
				targetS2Opp = vertical ? targetRect.right : targetRect.bottom,
				targetOppLength = vertical ? targetRect.width : targetRect.height;
			return dragElS1Opp === targetS1Opp || dragElS2Opp === targetS2Opp || dragElS1Opp + dragElOppLength /
				2 === targetS1Opp + targetOppLength / 2;
		},

		/**
		 * Detects first nearest empty sortable to X and Y position using emptyInsertThreshold.
		 * @param  {Number} x      X position
		 * @param  {Number} y      Y position
		 * @return {HTMLElement}   Element of the first found nearest Sortable
		 */
		_detectNearestEmptySortable = function _detectNearestEmptySortable(x, y) {
			var ret;
			sortables.some(function(sortable) {
				if (lastChild(sortable)) return;
				var rect = getRect(sortable),
					threshold = sortable[expando].options.emptyInsertThreshold,
					insideHorizontally = x >= rect.left - threshold && x <= rect.right + threshold,
					insideVertically = y >= rect.top - threshold && y <= rect.bottom + threshold;

				if (threshold && insideHorizontally && insideVertically) {
					return ret = sortable;
				}
			});
			return ret;
		},
		_prepareGroup = function _prepareGroup(options) {
			function toFn(value, pull) {
				return function(to, from, dragEl, evt) {
					var sameGroup = to.options.group.name && from.options.group.name && to.options.group
						.name === from.options.group.name;

					if (value == null && (pull || sameGroup)) {
						// Default pull value
						// Default pull and put value if same group
						return true;
					} else if (value == null || value === false) {
						return false;
					} else if (pull && value === 'clone') {
						return value;
					} else if (typeof value === 'function') {
						return toFn(value(to, from, dragEl, evt), pull)(to, from, dragEl, evt);
					} else {
						var otherGroup = (pull ? to : from).options.group.name;
						return value === true || typeof value === 'string' && value === otherGroup || value
							.join && value.indexOf(otherGroup) > -1;
					}
				};
			}

			var group = {};
			var originalGroup = options.group;

			if (!originalGroup || _typeof(originalGroup) != 'object') {
				originalGroup = {
					name: originalGroup
				};
			}

			group.name = originalGroup.name;
			group.checkPull = toFn(originalGroup.pull, true);
			group.checkPut = toFn(originalGroup.put);
			group.revertClone = originalGroup.revertClone;
			options.group = group;
		},

		_hideGhostForTarget = function _hideGhostForTarget() {
			if (!supportCssPointerEvents && ghostEl) {
				css(ghostEl, 'display', 'none');
			}
		},

		_unhideGhostForTarget = function _unhideGhostForTarget() {
			if (!supportCssPointerEvents && ghostEl) {
				css(ghostEl, 'display', '');
			}
		}; // #1184 fix - Prevent click event on fallback if dragged but item not changed position


	if (documentExists) {
		document.addEventListener('click', function(evt) {
			if (ignoreNextClick) {
				evt.preventDefault();
				evt.stopPropagation && evt.stopPropagation();
				evt.stopImmediatePropagation && evt.stopImmediatePropagation();
				ignoreNextClick = false;
				return false;
			}
		}, true);
	}

	var nearestEmptyInsertDetectEvent = function nearestEmptyInsertDetectEvent(evt) {
		if (dragEl) {
			evt = evt.touches ? evt.touches[0] : evt;

			var nearest = _detectNearestEmptySortable(evt.clientX, evt.clientY);

			if (nearest) {
				// Create imitation event
				var event = {};

				for (var i in evt) {
					if (evt.hasOwnProperty(i)) {
						event[i] = evt[i];
					}
				}

				event.target = event.rootEl = nearest;
				event.preventDefault = void 0;
				event.stopPropagation = void 0;

				nearest[expando]._onDragOver(event);
			}
		}
	};

	var _checkOutsideTargetEl = function _checkOutsideTargetEl(evt) {
		if (dragEl) {
			dragEl.parentNode[expando]._isOutsideThisEl(evt.target);
		}
	};
	/**
	 * @class  Sortable
	 * @param  {HTMLElement}  el
	 * @param  {Object}       [options]
	 */


	function Sortable(el, options) {
		if (!(el && el.nodeType && el.nodeType === 1)) {
			throw "Sortable: `el` must be an HTMLElement, not ".concat({}.toString.call(el));
		}

		this.el = el; // root element

		this.options = options = _extends({}, options); // Export instance

		el[expando] = this;
		var defaults = {
			group: null,
			sort: true,
			disabled: false,
			store: null,
			handle: null,
			draggable: /^[uo]l$/i.test(el.nodeName) ? '>li' : '>*',
			swapThreshold: 1,
			// percentage; 0 <= x <= 1
			invertSwap: false,
			// invert always
			invertedSwapThreshold: null,
			// will be set to same as swapThreshold if default
			removeCloneOnHide: true,
			direction: function direction() {
				return _detectDirection(el, this.options);
			},
			ghostClass: 'sortable-ghost',
			chosenClass: 'sortable-chosen',
			dragClass: 'sortable-drag',
			ignore: 'a, img',
			filter: null,
			preventOnFilter: true,
			animation: 0,
			easing: null,
			setData: function setData(dataTransfer, dragEl) {
				dataTransfer.setData('Text', dragEl.textContent);
			},
			dropBubble: false,
			dragoverBubble: false,
			dataIdAttr: 'data-id',
			delay: 0,
			delayOnTouchOnly: false,
			touchStartThreshold: (Number.parseInt ? Number : window).parseInt(window.devicePixelRatio,
				10) || 1,
			forceFallback: false,
			fallbackClass: 'sortable-fallback',
			fallbackOnBody: false,
			fallbackTolerance: 0,
			fallbackOffset: {
				x: 0,
				y: 0
			},
			supportPointer: Sortable.supportPointer !== false && 'PointerEvent' in window,
			emptyInsertThreshold: 5
		};

		for (var name in defaults) {
			!(name in options) && (options[name] = defaults[name]);
		}

		_prepareGroup(options); // Bind all private methods


		for (var fn in this) {
			if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
				this[fn] = this[fn].bind(this);
			}
		} // Setup drag mode


		this.nativeDraggable = options.forceFallback ? false : supportDraggable;

		if (this.nativeDraggable) {
			// Touch start threshold cannot be greater than the native dragstart threshold
			this.options.touchStartThreshold = 1;
		} // Bind events


		if (options.supportPointer) {
			on(el, 'pointerdown', this._onTapStart);
		} else {
			on(el, 'mousedown', this._onTapStart);
			on(el, 'touchstart', this._onTapStart);
		}

		if (this.nativeDraggable) {
			on(el, 'dragover', this);
			on(el, 'dragenter', this);
		}

		sortables.push(this.el); // Restore sorting

		options.store && options.store.get && this.sort(options.store.get(this) ||
	[]); // Add animation state manager

		_extends(this, AnimationStateManager());
	}

	Sortable.prototype =
		/** @lends Sortable.prototype */
		{
			constructor: Sortable,
			_isOutsideThisEl: function _isOutsideThisEl(target) {
				if (!this.el.contains(target) && target !== this.el) {
					lastTarget = null;
				}
			},
			_getDirection: function _getDirection(evt, target) {
				return typeof this.options.direction === 'function' ? this.options.direction.call(this, evt,
					target, dragEl) : this.options.direction;
			},
			_onTapStart: function _onTapStart(
				/** Event|TouchEvent */
				evt) {
				if (!evt.cancelable) return;

				var _this = this,
					el = this.el,
					options = this.options,
					preventOnFilter = options.preventOnFilter,
					type = evt.type,
					touch = evt.touches && evt.touches[0] || evt.pointerType && evt.pointerType ===
					'touch' && evt,
					target = (touch || evt).target,
					originalTarget = evt.target.shadowRoot && (evt.path && evt.path[0] || evt
						.composedPath && evt.composedPath()[0]) || target,
					filter = options.filter;

				_saveInputCheckedState(
					el
					); // Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.


				if (dragEl) {
					return;
				}

				if (/mousedown|pointerdown/.test(type) && evt.button !== 0 || options.disabled) {
					return; // only left button and enabled
				} // cancel dnd if original target is content editable


				if (originalTarget.isContentEditable) {
					return;
				}

				target = closest(target, options.draggable, el, false);

				if (target && target.animated) {
					return;
				}

				if (lastDownEl === target) {
					// Ignoring duplicate `down`
					return;
				} // Get the index of the dragged element within its parent


				oldIndex = index(target);
				oldDraggableIndex = index(target, options.draggable); // Check filter

				if (typeof filter === 'function') {
					if (filter.call(this, evt, target, this)) {
						_dispatchEvent({
							sortable: _this,
							rootEl: originalTarget,
							name: 'filter',
							targetEl: target,
							toEl: el,
							fromEl: el
						});

						preventOnFilter && evt.cancelable && evt.preventDefault();
						return; // cancel dnd
					}
				} else if (filter) {
					filter = filter.split(',').some(function(criteria) {
						criteria = closest(originalTarget, criteria.trim(), el, false);

						if (criteria) {
							_dispatchEvent({
								sortable: _this,
								rootEl: criteria,
								name: 'filter',
								targetEl: target,
								fromEl: el,
								toEl: el
							});

							return true;
						}
					});

					if (filter) {
						preventOnFilter && evt.cancelable && evt.preventDefault();
						return; // cancel dnd
					}
				}

				if (options.handle && !closest(originalTarget, options.handle, el, false)) {
					return;
				} // Prepare `dragstart`


				this._prepareDragStart(evt, touch, target);
			},
			_prepareDragStart: function _prepareDragStart(
				/** Event */
				evt,
				/** Touch */
				touch,
				/** HTMLElement */
				target) {
				var _this = this,
					el = _this.el,
					options = _this.options,
					ownerDocument = el.ownerDocument,
					dragStartFn;

				if (target && !dragEl && target.parentNode === el) {
					var dragRect = getRect(target);
					rootEl = el;
					dragEl = target;
					parentEl = dragEl.parentNode;
					nextEl = dragEl.nextSibling;
					lastDownEl = target;
					activeGroup = options.group;
					Sortable.dragged = dragEl;
					tapEvt = {
						target: dragEl,
						clientX: (touch || evt).clientX,
						clientY: (touch || evt).clientY
					};
					tapDistanceLeft = tapEvt.clientX - dragRect.left;
					tapDistanceTop = tapEvt.clientY - dragRect.top;
					this._lastX = (touch || evt).clientX;
					this._lastY = (touch || evt).clientY;
					dragEl.style['will-change'] = 'all';

					dragStartFn = function dragStartFn() {
						if (Sortable.eventCanceled) {
							_this._onDrop();

							return;
						} // Delayed drag has been triggered
						// we can re-enable the events: touchmove/mousemove


						_this._disableDelayedDragEvents();

						if (!FireFox && _this.nativeDraggable) {
							dragEl.draggable = true;
						} // Bind the events: dragstart/dragend


						_this._triggerDragStart(evt, touch); // Drag start event


						_dispatchEvent({
							sortable: _this,
							name: 'choose',
							originalEvent: evt
						}); // Chosen item


						toggleClass(dragEl, options.chosenClass, true);
					}; // Disable "draggable"


					options.ignore.split(',').forEach(function(criteria) {
						find(dragEl, criteria.trim(), _disableDraggable);
					});
					on(ownerDocument, 'dragover', nearestEmptyInsertDetectEvent);
					on(ownerDocument, 'mousemove', nearestEmptyInsertDetectEvent);
					on(ownerDocument, 'touchmove', nearestEmptyInsertDetectEvent);
					on(ownerDocument, 'mouseup', _this._onDrop);
					on(ownerDocument, 'touchend', _this._onDrop);
					on(ownerDocument, 'touchcancel', _this
						._onDrop); // Make dragEl draggable (must be before delay for FireFox)

					if (FireFox && this.nativeDraggable) {
						this.options.touchStartThreshold = 4;
						dragEl.draggable = true;
					}

					if (options.delay && (!options.delayOnTouchOnly || touch) && (!this.nativeDraggable || !
							(Edge || IE11OrLess))) {
						if (Sortable.eventCanceled) {
							this._onDrop();

							return;
						} // If the user moves the pointer or let go the click or touch
						// before the delay has been reached:
						// disable the delayed drag


						on(ownerDocument, 'mouseup', _this._disableDelayedDrag);
						on(ownerDocument, 'touchend', _this._disableDelayedDrag);
						on(ownerDocument, 'touchcancel', _this._disableDelayedDrag);
						on(ownerDocument, 'mousemove', _this._delayedDragTouchMoveHandler);
						on(ownerDocument, 'touchmove', _this._delayedDragTouchMoveHandler);
						options.supportPointer && on(ownerDocument, 'pointermove', _this
							._delayedDragTouchMoveHandler);
						_this._dragStartTimer = setTimeout(dragStartFn, options.delay);
					} else {
						dragStartFn();
					}
				}
			},
			_delayedDragTouchMoveHandler: function _delayedDragTouchMoveHandler(
				/** TouchEvent|PointerEvent **/
				e) {
				var touch = e.touches ? e.touches[0] : e;

				if (Math.max(Math.abs(touch.clientX - this._lastX), Math.abs(touch.clientY - this
						._lastY)) >= Math.floor(this.options.touchStartThreshold / (this.nativeDraggable &&
						window.devicePixelRatio || 1))) {
					this._disableDelayedDrag();
				}
			},
			_disableDelayedDrag: function _disableDelayedDrag() {
				dragEl && _disableDraggable(dragEl);
				clearTimeout(this._dragStartTimer);

				this._disableDelayedDragEvents();
			},
			_disableDelayedDragEvents: function _disableDelayedDragEvents() {
				var ownerDocument = this.el.ownerDocument;
				off(ownerDocument, 'mouseup', this._disableDelayedDrag);
				off(ownerDocument, 'touchend', this._disableDelayedDrag);
				off(ownerDocument, 'touchcancel', this._disableDelayedDrag);
				off(ownerDocument, 'mousemove', this._delayedDragTouchMoveHandler);
				off(ownerDocument, 'touchmove', this._delayedDragTouchMoveHandler);
				off(ownerDocument, 'pointermove', this._delayedDragTouchMoveHandler);
			},
			_triggerDragStart: function _triggerDragStart(
				/** Event */
				evt,
				/** Touch */
				touch) {
				touch = touch || evt.pointerType == 'touch' && evt;

				if (!this.nativeDraggable || touch) {
					if (this.options.supportPointer) {
						on(document, 'pointermove', this._onTouchMove);
					} else if (touch) {
						on(document, 'touchmove', this._onTouchMove);
					} else {
						on(document, 'mousemove', this._onTouchMove);
					}
				} else {
					on(dragEl, 'dragend', this);
					on(rootEl, 'dragstart', this._onDragStart);
				}

				try {
					if (document.selection) {
						// Timeout neccessary for IE9
						_nextTick(function() {
							document.selection.empty();
						});
					} else {
						window.getSelection().removeAllRanges();
					}
				} catch (err) {}
			},
			_dragStarted: function _dragStarted(fallback, evt) {

				awaitingDragStarted = false;

				if (rootEl && dragEl) {


					if (this.nativeDraggable) {
						on(document, 'dragover', _checkOutsideTargetEl);
					}

					var options = this.options; // Apply effect

					!fallback && toggleClass(dragEl, options.dragClass, false);
					toggleClass(dragEl, options.ghostClass, true);
					Sortable.active = this;
					fallback && this._appendGhost(); // Drag start event

					_dispatchEvent({
						sortable: this,
						name: 'start',
						originalEvent: evt
					});
				} else {
					this._nulling();
				}
			},
			_emulateDragOver: function _emulateDragOver() {
				if (touchEvt) {
					this._lastX = touchEvt.clientX;
					this._lastY = touchEvt.clientY;

					_hideGhostForTarget();

					var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
					var parent = target;

					while (target && target.shadowRoot) {
						target = target.shadowRoot.elementFromPoint(touchEvt.clientX, touchEvt.clientY);
						if (target === parent) break;
						parent = target;
					}

					dragEl.parentNode[expando]._isOutsideThisEl(target);

					if (parent) {
						do {
							if (parent[expando]) {
								var inserted = void 0;
								inserted = parent[expando]._onDragOver({
									clientX: touchEvt.clientX,
									clientY: touchEvt.clientY,
									target: target,
									rootEl: parent
								});

								if (inserted && !this.options.dragoverBubble) {
									break;
								}
							}

							target = parent; // store last element
						}
						/* jshint boss:true */
						while (parent = parent.parentNode);
					}

					_unhideGhostForTarget();
				}
			},
			
			_onTouchMove: function _onTouchMove(evt) {
				if (tapEvt) {
					var options = this.options,
						fallbackTolerance = options.fallbackTolerance,
						fallbackOffset = options.fallbackOffset,
						touch = evt.touches ? evt.touches[0] : evt,
						ghostMatrix = ghostEl && matrix(ghostEl, true),
						scaleX = ghostEl && ghostMatrix && ghostMatrix.a,
						scaleY = ghostEl && ghostMatrix && ghostMatrix.d,
						relativeScrollOffset = PositionGhostAbsolutely && ghostRelativeParent &&
						getRelativeScrollOffset(ghostRelativeParent),
						dx = (touch.clientX - tapEvt.clientX + fallbackOffset.x) / (scaleX || 1) + (
							relativeScrollOffset ? relativeScrollOffset[0] -
							ghostRelativeParentInitialScroll[0] : 0) / (scaleX || 1),
						dy = (touch.clientY - tapEvt.clientY + fallbackOffset.y) / (scaleY || 1) + (
							relativeScrollOffset ? relativeScrollOffset[1] -
							ghostRelativeParentInitialScroll[1] : 0) / (scaleY ||
							1); // only set the status to dragging, when we are actually dragging

					if (!Sortable.active && !awaitingDragStarted) {
						if (fallbackTolerance && Math.max(Math.abs(touch.clientX - this._lastX), Math.abs(
								touch.clientY - this._lastY)) < fallbackTolerance) {
							return;
						}

						this._onDragStart(evt, true);
					}

					if (ghostEl) {
						if (ghostMatrix) {
							ghostMatrix.e += dx - (lastDx || 0);
							
							if (!options.freezeY) {
								ghostMatrix.f += dy - (lastDy || 0);
							}
						} else {
							ghostMatrix = {
								a: 1,
								b: 0,
								c: 0,
								d: 1,
								e: dx,
								f: dy
							};
						}

						var cssMatrix = "matrix(".concat(ghostMatrix.a, ",").concat(ghostMatrix.b, ",")
							.concat(ghostMatrix.c, ",").concat(ghostMatrix.d, ",").concat(ghostMatrix.e,
								",").concat(ghostMatrix.f, ")");
						css(ghostEl, 'webkitTransform', cssMatrix);
						css(ghostEl, 'mozTransform', cssMatrix);
						css(ghostEl, 'msTransform', cssMatrix);
						css(ghostEl, 'transform', cssMatrix);
						lastDx = dx;
						lastDy = dy;
						touchEvt = touch;
					}

					evt.cancelable && evt.preventDefault();
				}
			},
			
			_appendGhost: function _appendGhost() {
				// Bug if using scale(): https://stackoverflow.com/questions/2637058
				// Not being adjusted for
				if (!ghostEl) {
					var container = this.options.fallbackOnBody ? document.body : rootEl,
						rect = getRect(dragEl, true, PositionGhostAbsolutely, true, container),
						options = this.options; // Position absolutely

					if (PositionGhostAbsolutely) {
						// Get relatively positioned parent
						ghostRelativeParent = container;

						while (css(ghostRelativeParent, 'position') === 'static' && css(ghostRelativeParent,
								'transform') === 'none' && ghostRelativeParent !== document) {
							ghostRelativeParent = ghostRelativeParent.parentNode;
						}

						if (ghostRelativeParent !== document.body && ghostRelativeParent !== document
							.documentElement) {
							if (ghostRelativeParent === document) ghostRelativeParent =
								getWindowScrollingElement();
							rect.top += ghostRelativeParent.scrollTop;
							rect.left += ghostRelativeParent.scrollLeft;
						} else {
							ghostRelativeParent = getWindowScrollingElement();
						}

						ghostRelativeParentInitialScroll = getRelativeScrollOffset(ghostRelativeParent);
					}

					ghostEl = this._createGhostEl(rect);
					Sortable.ghost = ghostEl;
					container.appendChild(ghostEl); // Set transform-origin

					css(ghostEl, 'transform-origin', tapDistanceLeft / parseInt(ghostEl.style.width) * 100 +
						'% ' + tapDistanceTop / parseInt(ghostEl.style.height) * 100 + '%');
				}
			},
			
			_createGhostEl: function _createGhostEl(rect) {
				var options = this.options;
				var result = null;

				if (options.onCreateGhost) {
					result = options.onCreateGhost.call(this, dragEl);
				}

				if (!result) {
					result = dragEl.cloneNode(true);
					
					toggleClass(result, options.ghostClass, false);
					toggleClass(result, options.fallbackClass, true);
					toggleClass(result, options.dragClass, true);
					css(result, 'transition', '');
					css(result, 'transform', '');
					css(result, 'box-sizing', 'border-box');
					css(result, 'margin', 0);
					
					css(result, 'width', rect.width);
					css(result, 'height', rect.height); 
				}

				css(result, 'top', rect.top);
				css(result, 'left', rect.left);
				css(result, 'opacity', '0.5');
				css(result, 'position', PositionGhostAbsolutely ? 'absolute' : 'fixed');
				css(result, 'zIndex', '100000');
				css(result, 'pointerEvents', 'none');

				return result;
			},

			_onDragStart: function _onDragStart(evt, fallback) {
				var _this = this;

				var dataTransfer = evt.dataTransfer;
				var options = _this.options;

				if (Sortable.eventCanceled) {
					this._onDrop();
					return;
				}

				if (!Sortable.eventCanceled) {
					cloneEl = clone(dragEl);
					cloneEl.draggable = false;
					cloneEl.style['will-change'] = '';

					this._hideClone();

					toggleClass(cloneEl, this.options.chosenClass, false);
					Sortable.clone = cloneEl;
				} // #1143: IFrame support workaround


				_this.cloneId = _nextTick(function() {
					if (Sortable.eventCanceled) return;

					if (!_this.options.removeCloneOnHide) {
						rootEl.insertBefore(cloneEl, dragEl);
					}

					_this._hideClone();

					_dispatchEvent({
						sortable: _this,
						name: 'clone'
					});
				});
				!fallback && toggleClass(dragEl, options.dragClass, true); // Set proper drop events

				if (fallback) {
					ignoreNextClick = true;
					_this._loopId = setInterval(_this._emulateDragOver, 50);
				} else {
					// Undo what was set in _prepareDragStart before drag started
					off(document, 'mouseup', _this._onDrop);
					off(document, 'touchend', _this._onDrop);
					off(document, 'touchcancel', _this._onDrop);

					if (dataTransfer) {
						dataTransfer.effectAllowed = 'move';
						options.setData && options.setData.call(_this, dataTransfer, dragEl);
					}

					on(document, 'drop', _this); // #1276 fix:

					css(dragEl, 'transform', 'translateZ(0)');
				}

				awaitingDragStarted = true;
				_this._dragStartId = _nextTick(_this._dragStarted.bind(_this, fallback, evt));
				on(document, 'selectstart', _this);
				moved = true;

				if (Safari) {
					css(document.body, 'user-select', 'none');
				}
			},
			// Returns true - if no further action is needed (either inserted or another condition)
			_onDragOver: function _onDragOver(evt) {
				var el = this.el,
					target = evt.target,
					dragRect,
					targetRect,
					revert,
					options = this.options,
					group = options.group,
					activeSortable = Sortable.active,
					isOwner = activeGroup === group,
					canSort = options.sort,
					fromSortable = putSortable || activeSortable,
					vertical,
					_this = this,
					completedFired = false;

				if (_silent) return;

				function dragOverEvent(name, extra) {

				} // Capture animation state


				function capture() {
					dragOverEvent('dragOverAnimationCapture');

					_this.captureAnimationState();

					if (_this !== fromSortable) {
						fromSortable.captureAnimationState();
					}
				} // Return invocation when dragEl is inserted (or completed)


				function completed(insertion) {
					dragOverEvent('dragOverCompleted', {
						insertion: insertion
					});

					if (insertion) {
						// Clones must be hidden before folding animation to capture dragRectAbsolute properly
						if (isOwner) {
							activeSortable._hideClone();
						} else {
							activeSortable._showClone(_this);
						}

						if (_this !== fromSortable) {
							// Set ghost class to new sortable's ghost class
							toggleClass(dragEl, putSortable ? putSortable.options.ghostClass :
								activeSortable.options.ghostClass, false);
							toggleClass(dragEl, options.ghostClass, true);
						}

						if (putSortable !== _this && _this !== Sortable.active) {
							putSortable = _this;
						} else if (_this === Sortable.active && putSortable) {
							putSortable = null;
						} // Animation


						if (fromSortable === _this) {
							_this._ignoreWhileAnimating = target;
						}

						_this.animateAll(function() {
							dragOverEvent('dragOverAnimationComplete');
							_this._ignoreWhileAnimating = null;
						});

						if (_this !== fromSortable) {
							fromSortable.animateAll();
							fromSortable._ignoreWhileAnimating = null;
						}
					} // Null lastTarget if it is not inside a previously swapped element


					if (target === dragEl && !dragEl.animated || target === el && !target.animated) {
						lastTarget = null;
					} // no bubbling and not fallback


					if (!options.dragoverBubble && !evt.rootEl && target !== document) {
						dragEl.parentNode[expando]._isOutsideThisEl(evt
							.target); // Do not detect for empty insert if already inserted


						!insertion && nearestEmptyInsertDetectEvent(evt);
					}

					!options.dragoverBubble && evt.stopPropagation && evt.stopPropagation();
					return completedFired = true;
				} // Call when dragEl has been inserted


				function changed() {
					newIndex = index(dragEl);
					newDraggableIndex = index(dragEl, options.draggable);

					_dispatchEvent({
						sortable: _this,
						name: 'change',
						toEl: el,
						newIndex: newIndex,
						newDraggableIndex: newDraggableIndex,
						originalEvent: evt
					});
				}

				if (evt.preventDefault !== void 0) {
					evt.cancelable && evt.preventDefault();
				}

				target = closest(target, options.draggable, el, true);
				dragOverEvent('dragOver');
				if (Sortable.eventCanceled) return completedFired;

				if (dragEl.contains(evt.target) || target.animated && target.animatingX && target
					.animatingY || _this._ignoreWhileAnimating === target) {
					return completed(false);
				}

				ignoreNextClick = false;
				var accept = false;
				var mode = null;
				
				if (isOwner) {
					accept = canSort || (revert = !rootEl.contains(dragEl)); //Reverting item into the original list
					if (accept) {
						mode = "isOwner";
						console.log("isOwner");
					}
				}
				else if (putSortable === this) {
					accept = true;
					if (accept) {
						mode = "putSortable";
						console.log("putSortable");
					}
				}
				else {
					this.lastPutMode = activeGroup.checkPull(this, activeSortable, dragEl, evt) && group.checkPut(this, activeSortable, dragEl, evt);
					accept = this.lastPutMode;
					if (accept) {
						mode = "lastPutMode";
						console.log("lastPutMode");
					}
				};
							
				if (activeSortable && !options.disabled && accept) {
					vertical = this._getDirection(evt, target) === 'vertical';
					dragRect = getRect(dragEl);
					dragOverEvent('dragOverValid');
					if (Sortable.eventCanceled) return completedFired;

					if (revert) {
						parentEl = rootEl; // actualization

						capture();
						this._hideClone();
						dragOverEvent('revert');

						if (!Sortable.eventCanceled) {
							if (nextEl) {
								console.log("insertBefore");
								rootEl.insertBefore(dragEl, nextEl);
							} 
							else {
								console.log("appendChild");
								rootEl.appendChild(dragEl);
							}
						}

						return completed(true);
					}

					var elLastChild = lastChild(el, options.draggable);

					if (!elLastChild || _ghostIsLast(evt, vertical, this) && !elLastChild.animated) {
						// If already at end of list: Do not insert
						if (elLastChild === dragEl) {
							return completed(false);
						} // assign target only if condition is true


						if (elLastChild && el === evt.target) {
							target = elLastChild;
						}

						if (target) {
							targetRect = getRect(target);
						}

						if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt, !!target) !== false) {
							capture();
							el.appendChild(dragEl);
							parentEl = el; // actualization

							changed();
							return completed(true);
						}
					} else if (target.parentNode === el) {
						targetRect = getRect(target);
						var direction = 0,
							targetBeforeFirstSwap,
							differentLevel = dragEl.parentNode !== el,
							differentRowCol = !_dragElInRowColumn(dragEl.animated && dragEl.toRect ||
								dragRect, target.animated && target.toRect || targetRect, vertical),
							side1 = vertical ? 'top' : 'left',
							scrolledPastTop = isScrolledPast(target, 'top', 'top') || isScrolledPast(dragEl,
								'top', 'top'),
							scrollBefore = scrolledPastTop ? scrolledPastTop.scrollTop : void 0;

						if (lastTarget !== target) {
							targetBeforeFirstSwap = targetRect[side1];
							pastFirstInvertThresh = false;
							isCircumstantialInvert = !differentRowCol && options.invertSwap ||
								differentLevel;
						}

						direction = _getSwapDirection(evt, target, targetRect, vertical, differentRowCol ?
							1 : options.swapThreshold, options.invertedSwapThreshold == null ? options
							.swapThreshold : options.invertedSwapThreshold, isCircumstantialInvert,
							lastTarget === target);
						var sibling;

						if (direction !== 0) {
							// Check if target is beside dragEl in respective direction (ignoring hidden elements)
							var dragIndex = index(dragEl);

							do {
								dragIndex -= direction;
								sibling = parentEl.children[dragIndex];
							} while (sibling && (css(sibling, 'display') === 'none' || sibling === ghostEl));
						} // If dragEl is already beside target: Do not insert


						if (direction === 0 || sibling === target) {
							return completed(false);
						}

						lastTarget = target;
						lastDirection = direction;
						var nextSibling = target.nextElementSibling,
							after = false;
						after = direction === 1;

						var moveVector = _onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt,
							after);

						if (moveVector !== false) {
							if (moveVector === 1 || moveVector === -1) {
								after = moveVector === 1;
							}

							_silent = true;
							setTimeout(_unsilent, 30);
							capture();

							if (after && !nextSibling) {
								this._injectDragElement(el, "appendChild", dragEl, null, mode);
							} else {
								this._injectDragElement(target.parentNode, "insertBefore", dragEl, after ? nextSibling : target, mode);
							} // Undo chrome's scroll adjustment (has no effect on other browsers)

							if (scrolledPastTop) {
								scrollBy(scrolledPastTop, 0, scrollBefore - scrolledPastTop.scrollTop);
							}

							parentEl = dragEl.parentNode; // actualization
							// must be done before animation

							if (targetBeforeFirstSwap !== undefined && !isCircumstantialInvert) {
								targetMoveDistance = Math.abs(targetBeforeFirstSwap - getRect(target)[
									side1]);
							}

							changed();
							return completed(true);
						}
					}

					if (el.contains(dragEl)) {
						return completed(false);
					}
				}

				return false;
			},
			
			_injectDragElement: function _injectDragElement(parentEl, method, el, after, mode) {
				var injectEl = null;
				
				var options = this.options;
				if (options.onInjectDragElement) {
					injectEl = options.onInjectDragElement.call(this, parentEl, method, el, after);
				}
				
				injectEl = injectEl || el;
				if ("insertBefore" == method) {
					parentEl.insertBefore(injectEl, after);
				}
				else {
					parentEl.appendChild(injectEl);
				}
			},
						
			_ignoreWhileAnimating: null,
			_offMoveEvents: function _offMoveEvents() {
				off(document, 'mousemove', this._onTouchMove);
				off(document, 'touchmove', this._onTouchMove);
				off(document, 'pointermove', this._onTouchMove);
				off(document, 'dragover', nearestEmptyInsertDetectEvent);
				off(document, 'mousemove', nearestEmptyInsertDetectEvent);
				off(document, 'touchmove', nearestEmptyInsertDetectEvent);
			},
			_offUpEvents: function _offUpEvents() {
				var ownerDocument = this.el.ownerDocument;
				off(ownerDocument, 'mouseup', this._onDrop);
				off(ownerDocument, 'touchend', this._onDrop);
				off(ownerDocument, 'pointerup', this._onDrop);
				off(ownerDocument, 'touchcancel', this._onDrop);
				off(document, 'selectstart', this);
			},
			_onDrop: function _onDrop(evt) {
				var el = this.el,
					options = this.options; // Get the index of the dragged element within its parent

				newIndex = index(dragEl);
				newDraggableIndex = index(dragEl, options.draggable);

				parentEl = dragEl && dragEl.parentNode; // Get again after plugin event

				newIndex = index(dragEl);
				newDraggableIndex = index(dragEl, options.draggable);

				if (Sortable.eventCanceled) {
					this._nulling();

					return;
				}

				awaitingDragStarted = false;
				isCircumstantialInvert = false;
				pastFirstInvertThresh = false;
				clearInterval(this._loopId);
				clearTimeout(this._dragStartTimer);

				_cancelNextTick(this.cloneId);

				_cancelNextTick(this._dragStartId); // Unbind events


				if (this.nativeDraggable) {
					off(document, 'drop', this);
					off(el, 'dragstart', this._onDragStart);
				}

				this._offMoveEvents();

				this._offUpEvents();

				if (Safari) {
					css(document.body, 'user-select', '');
				}

				css(dragEl, 'transform', '');

				if (evt) {
					if (moved) {
						evt.cancelable && evt.preventDefault();
						!options.dropBubble && evt.stopPropagation();
					}

					ghostEl && ghostEl.parentNode && ghostEl.parentNode.removeChild(ghostEl);

					if (rootEl === parentEl || putSortable && putSortable.lastPutMode !== 'clone') {
						// Remove clone(s)
						cloneEl && cloneEl.parentNode && cloneEl.parentNode.removeChild(cloneEl);
					}

					if (dragEl) {
						if (this.nativeDraggable) {
							off(dragEl, 'dragend', this);
						}

						_disableDraggable(dragEl);

						dragEl.style['will-change'] = ''; // Remove classes
						// ghostClass is added in dragStarted

						if (moved && !awaitingDragStarted) {
							toggleClass(dragEl, putSortable ? putSortable.options.ghostClass : this.options
								.ghostClass, false);
						}

						toggleClass(dragEl, this.options.chosenClass, false); // Drag stop event

						_dispatchEvent({
							sortable: this,
							name: 'unchoose',
							toEl: parentEl,
							newIndex: null,
							newDraggableIndex: null,
							originalEvent: evt
						});

						if (rootEl !== parentEl) {
							if (newIndex >= 0) {
								// Add event
								_dispatchEvent({
									rootEl: parentEl,
									name: 'add',
									toEl: parentEl,
									fromEl: rootEl,
									originalEvent: evt
								}); // Remove event


								_dispatchEvent({
									sortable: this,
									name: 'remove',
									toEl: parentEl,
									originalEvent: evt
								}); // drag from one list and drop into another


								_dispatchEvent({
									rootEl: parentEl,
									name: 'sort',
									toEl: parentEl,
									fromEl: rootEl,
									originalEvent: evt
								});

								_dispatchEvent({
									sortable: this,
									name: 'sort',
									toEl: parentEl,
									originalEvent: evt
								});
							}

							putSortable && putSortable.save();
						} else {
							if (newIndex !== oldIndex) {
								if (newIndex >= 0) {
									// drag & drop within the same list
									_dispatchEvent({
										sortable: this,
										name: 'update',
										toEl: parentEl,
										originalEvent: evt
									});

									_dispatchEvent({
										sortable: this,
										name: 'sort',
										toEl: parentEl,
										originalEvent: evt
									});
								}
							}
						}

						if (Sortable.active) {
							/* jshint eqnull:true */
							if (newIndex == null || newIndex === -1) {
								newIndex = oldIndex;
								newDraggableIndex = oldDraggableIndex;
							}

							_dispatchEvent({
								sortable: this,
								name: 'end',
								toEl: parentEl,
								originalEvent: evt
							}); // Save sorting


							this.save();
						}
					}
				}

				this._nulling();
			},
			_nulling: function _nulling() {
				rootEl = dragEl = parentEl = ghostEl = nextEl = cloneEl = lastDownEl = cloneHidden =
					tapEvt = touchEvt = moved = newIndex = newDraggableIndex = oldIndex =
					oldDraggableIndex = lastTarget = lastDirection = putSortable = activeGroup = Sortable
					.dragged = Sortable.ghost = Sortable.clone = Sortable.active = null;
				savedInputChecked.forEach(function(el) {
					el.checked = true;
				});
				savedInputChecked.length = lastDx = lastDy = 0;
			},
			handleEvent: function handleEvent(
				/**Event*/
				evt) {
				switch (evt.type) {
					case 'drop':
					case 'dragend':
						this._onDrop(evt);

						break;

					case 'dragenter':
					case 'dragover':
						if (dragEl) {
							this._onDragOver(evt);

							_globalDragOver(evt);
						}

						break;

					case 'selectstart':
						evt.preventDefault();
						break;
				}
			},

			/**
			 * Serializes the item into an array of string.
			 * @returns {String[]}
			 */
			toArray: function toArray() {
				var order = [],
					el,
					children = this.el.children,
					i = 0,
					n = children.length,
					options = this.options;

				for (; i < n; i++) {
					el = children[i];

					if (closest(el, options.draggable, this.el, false)) {
						order.push(el.getAttribute(options.dataIdAttr) || _generateId(el));
					}
				}

				return order;
			},

			/**
			 * Sorts the elements according to the array.
			 * @param  {String[]}  order  order of the items
			 */
			sort: function sort(order) {
				var items = {},
					rootEl = this.el;
				this.toArray().forEach(function(id, i) {
					var el = rootEl.children[i];

					if (closest(el, this.options.draggable, rootEl, false)) {
						items[id] = el;
					}
				}, this);
				order.forEach(function(id) {
					if (items[id]) {
						rootEl.removeChild(items[id]);
						rootEl.appendChild(items[id]);
					}
				});
			},

			/**
			 * Save the current sorting
			 */
			save: function save() {
				var store = this.options.store;
				store && store.set && store.set(this);
			},

			/**
			 * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
			 * @param   {HTMLElement}  el
			 * @param   {String}       [selector]  default: `options.draggable`
			 * @returns {HTMLElement|null}
			 */
			closest: function closest$1(el, selector) {
				return closest(el, selector || this.options.draggable, this.el, false);
			},

			/**
			 * Set/get option
			 * @param   {string} name
			 * @param   {*}      [value]
			 * @returns {*}
			 */
			option: function option(name, value) {
				var options = this.options;

				if (value === void 0) {
					return options[name];
				} else {
					options[name] = value;
					
					if (name === 'group') {
						_prepareGroup(options);
					}
				}
			},

			/**
			 * Destroy
			 */
			destroy: function destroy() {
				var el = this.el;
				el[expando] = null;
				off(el, 'mousedown', this._onTapStart);
				off(el, 'touchstart', this._onTapStart);
				off(el, 'pointerdown', this._onTapStart);

				if (this.nativeDraggable) {
					off(el, 'dragover', this);
					off(el, 'dragenter', this);
				} // Remove draggable attributes


				Array.prototype.forEach.call(el.querySelectorAll('[draggable]'), function(el) {
					el.removeAttribute('draggable');
				});

				this._onDrop();

				this._disableDelayedDragEvents();

				sortables.splice(sortables.indexOf(this.el), 1);
				this.el = el = null;
			},
			_hideClone: function _hideClone() {
				if (!cloneHidden) {
					if (Sortable.eventCanceled) return;
					css(cloneEl, 'display', 'none');

					if (this.options.removeCloneOnHide && cloneEl.parentNode) {
						cloneEl.parentNode.removeChild(cloneEl);
					}

					cloneHidden = true;
				}
			},
			_showClone: function _showClone(putSortable) {
				if (putSortable.lastPutMode !== 'clone') {
					this._hideClone();

					return;
				}

				if (cloneHidden) {
					if (Sortable.eventCanceled) return; // show clone at dragEl or original position

					if (rootEl.contains(dragEl) && !this.options.group.revertClone) {
						rootEl.insertBefore(cloneEl, dragEl);
					} else if (nextEl) {
						rootEl.insertBefore(cloneEl, nextEl);
					} else {
						rootEl.appendChild(cloneEl);
					}

					if (this.options.group.revertClone) {
						this.animate(dragEl, cloneEl);
					}

					css(cloneEl, 'display', '');
					cloneHidden = false;
				}
			}
		};

	function _globalDragOver(
		/**Event*/
		evt) {
		if (evt.dataTransfer) {
			evt.dataTransfer.dropEffect = 'move';
		}

		evt.cancelable && evt.preventDefault();
	}

	function _onMove(fromEl, toEl, dragEl, dragRect, targetEl, targetRect, originalEvent, willInsertAfter) {
		var evt,
			sortable = fromEl[expando],
			onMoveFn = sortable.options.onMove,
			retVal; // Support for new CustomEvent feature

		if (window.CustomEvent && !IE11OrLess && !Edge) {
			evt = new CustomEvent('move', {
				bubbles: true,
				cancelable: true
			});
		} else {
			evt = document.createEvent('Event');
			evt.initEvent('move', true, true);
		}

		evt.to = toEl;
		evt.from = fromEl;
		evt.dragged = dragEl;
		evt.draggedRect = dragRect;
		evt.related = targetEl || toEl;
		evt.relatedRect = targetRect || getRect(toEl);
		evt.willInsertAfter = willInsertAfter;
		evt.originalEvent = originalEvent;
		fromEl.dispatchEvent(evt);

		if (onMoveFn) {
			retVal = onMoveFn.call(sortable, evt, originalEvent);
		}

		return retVal;
	}

	function _disableDraggable(el) {
		el.draggable = false;
	}

	function _unsilent() {
		_silent = false;
	}

	function _ghostIsLast(evt, vertical, sortable) {
		var rect = getRect(lastChild(sortable.el, sortable.options.draggable));
		var spacer = 10;
		return vertical ? evt.clientX > rect.right + spacer || evt.clientX <= rect.right && evt.clientY > rect
			.bottom && evt.clientX >= rect.left : evt.clientX > rect.right && evt.clientY > rect.top || evt
			.clientX <= rect.right && evt.clientY > rect.bottom + spacer;
	}

	function _getSwapDirection(evt, target, targetRect, vertical, swapThreshold, invertedSwapThreshold,
		invertSwap, isLastTarget) {
		var mouseOnAxis = vertical ? evt.clientY : evt.clientX,
			targetLength = vertical ? targetRect.height : targetRect.width,
			targetS1 = vertical ? targetRect.top : targetRect.left,
			targetS2 = vertical ? targetRect.bottom : targetRect.right,
			invert = false;

		if (!invertSwap) {
			// Never invert or create dragEl shadow when target movemenet causes mouse to move past the end of regular swapThreshold
			if (isLastTarget && targetMoveDistance < targetLength * swapThreshold) {
				// multiplied only by swapThreshold because mouse will already be inside target by (1 - threshold) * targetLength / 2
				// check if past first invert threshold on side opposite of lastDirection
				if (!pastFirstInvertThresh && (lastDirection === 1 ? mouseOnAxis > targetS1 + targetLength *
						invertedSwapThreshold / 2 : mouseOnAxis < targetS2 - targetLength *
						invertedSwapThreshold / 2)) {
					// past first invert threshold, do not restrict inverted threshold to dragEl shadow
					pastFirstInvertThresh = true;
				}

				if (!pastFirstInvertThresh) {
					// dragEl shadow (target move distance shadow)
					if (lastDirection === 1 ? mouseOnAxis < targetS1 + targetMoveDistance // over dragEl shadow
						:
						mouseOnAxis > targetS2 - targetMoveDistance) {
						return -lastDirection;
					}
				} else {
					invert = true;
				}
			} else {
				// Regular
				if (mouseOnAxis > targetS1 + targetLength * (1 - swapThreshold) / 2 && mouseOnAxis < targetS2 -
					targetLength * (1 - swapThreshold) / 2) {
					return _getInsertDirection(target);
				}
			}
		}

		invert = invert || invertSwap;

		if (invert) {
			// Invert of regular
			if (mouseOnAxis < targetS1 + targetLength * invertedSwapThreshold / 2 || mouseOnAxis > targetS2 -
				targetLength * invertedSwapThreshold / 2) {
				return mouseOnAxis > targetS1 + targetLength / 2 ? 1 : -1;
			}
		}

		return 0;
	}
	/**
	 * Gets the direction dragEl must be swapped relative to target in order to make it
	 * seem that dragEl has been "inserted" into that element's position
	 * @param  {HTMLElement} target       The target whose position dragEl is being inserted at
	 * @return {Number}                   Direction dragEl must be swapped
	 */


	function _getInsertDirection(target) {
		if (index(dragEl) < index(target)) {
			return 1;
		} else {
			return -1;
		}
	}
	/**
	 * Generate id
	 * @param   {HTMLElement} el
	 * @returns {String}
	 * @private
	 */


	function _generateId(el) {
		var str = el.tagName + el.className + el.src + el.href + el.textContent,
			i = str.length,
			sum = 0;

		while (i--) {
			sum += str.charCodeAt(i);
		}

		return sum.toString(36);
	}

	function _saveInputCheckedState(root) {
		savedInputChecked.length = 0;
		var inputs = root.getElementsByTagName('input');
		var idx = inputs.length;

		while (idx--) {
			var el = inputs[idx];
			el.checked && savedInputChecked.push(el);
		}
	}

	function _nextTick(fn) {
		return setTimeout(fn, 0);
	}

	function _cancelNextTick(id) {
		return clearTimeout(id);
	} // Fixed #973:


	if (documentExists) {
		on(document, 'touchmove', function(evt) {
			if ((Sortable.active || awaitingDragStarted) && evt.cancelable) {
				evt.preventDefault();
			}
		});
	} // Export utils


	Sortable.utils = {
		on: on,
		off: off,
		css: css,
		find: find,
		is: function is(el, selector) {
			return !!closest(el, selector, el, false);
		},
		extend: extend,
		throttle: throttle,
		closest: closest,
		toggleClass: toggleClass,
		clone: clone,
		index: index,
		nextTick: _nextTick,
		cancelNextTick: _cancelNextTick,
		detectDirection: _detectDirection,
		getChild: getChild
	};
	/**
	 * Get the Sortable instance of an element
	 * @param  {HTMLElement} element The element
	 * @return {Sortable|undefined}         The instance of Sortable
	 */

	Sortable.get = function(element) {
		return element[expando];
	};
	/**
	 * Mount a plugin to Sortable
	 * @param  {...SortablePlugin|SortablePlugin[]} plugins       Plugins being mounted
	 */


	Sortable.mount = function() {

	};
	/**
	 * Create sortable instance
	 * @param {HTMLElement}  el
	 * @param {Object}      [options]
	 */


	Sortable.create = function(el, options) {
		return new Sortable(el, options);
	}; // Export


	Sortable.version = version;

	function clearPointerElemChangedInterval() {
		clearInterval(pointerElemChangedInterval);
	}

	var drop = function drop(_ref) {
		var originalEvent = _ref.originalEvent,
			putSortable = _ref.putSortable,
			dragEl = _ref.dragEl,
			activeSortable = _ref.activeSortable,
			dispatchSortableEvent = _ref.dispatchSortableEvent,
			hideGhostForTarget = _ref.hideGhostForTarget,
			unhideGhostForTarget = _ref.unhideGhostForTarget;
		if (!originalEvent) return;
		var toSortable = putSortable || activeSortable;
		hideGhostForTarget();
		var touch = originalEvent.changedTouches && originalEvent.changedTouches.length ? originalEvent
			.changedTouches[0] : originalEvent;
		var target = document.elementFromPoint(touch.clientX, touch.clientY);
		unhideGhostForTarget();

		if (toSortable && !toSortable.el.contains(target)) {
			dispatchSortableEvent('spill');
			this.onSpill({
				dragEl: dragEl,
				putSortable: putSortable
			});
		}
	};

	function Revert() {}

	Revert.prototype = {
		startIndex: null,
		dragStart: function dragStart(_ref2) {
			var oldDraggableIndex = _ref2.oldDraggableIndex;
			this.startIndex = oldDraggableIndex;
		},
		onSpill: function onSpill(_ref3) {
			var dragEl = _ref3.dragEl,
				putSortable = _ref3.putSortable;
			this.sortable.captureAnimationState();

			if (putSortable) {
				putSortable.captureAnimationState();
			}

			var nextSibling = getChild(this.sortable.el, this.startIndex, this.options);

			if (nextSibling) {
				this.sortable.el.insertBefore(dragEl, nextSibling);
			} else {
				this.sortable.el.appendChild(dragEl);
			}

			this.sortable.animateAll();

			if (putSortable) {
				putSortable.animateAll();
			}
		},
		drop: drop
	};

	_extends(Revert, {
		pluginName: 'revertOnSpill'
	});

	function Remove() {}

	Remove.prototype = {
		onSpill: function onSpill(_ref4) {
			var dragEl = _ref4.dragEl,
				putSortable = _ref4.putSortable;
			var parentSortable = putSortable || this.sortable;
			parentSortable.captureAnimationState();
			dragEl.parentNode && dragEl.parentNode.removeChild(dragEl);
			parentSortable.animateAll();
		},
		drop: drop
	};

	_extends(Remove, {
		pluginName: 'removeOnSpill'
	});

	var lastSwapEl;

	function SwapPlugin() {
		function Swap() {
			this.defaults = {
				swapClass: 'sortable-swap-highlight'
			};
		}

		Swap.prototype = {
			dragStart: function dragStart(_ref) {
				var dragEl = _ref.dragEl;
				lastSwapEl = dragEl;
			},
			dragOverValid: function dragOverValid(_ref2) {
				var completed = _ref2.completed,
					target = _ref2.target,
					onMove = _ref2.onMove,
					activeSortable = _ref2.activeSortable,
					changed = _ref2.changed,
					cancel = _ref2.cancel;
				if (!activeSortable.options.swap) return;
				var el = this.sortable.el,
					options = this.options;

				if (target && target !== el) {
					var prevSwapEl = lastSwapEl;

					if (onMove(target) !== false) {
						toggleClass(target, options.swapClass, true);
						lastSwapEl = target;
					} else {
						lastSwapEl = null;
					}

					if (prevSwapEl && prevSwapEl !== lastSwapEl) {
						toggleClass(prevSwapEl, options.swapClass, false);
					}
				}

				changed();
				completed(true);
				cancel();
			},
			drop: function drop(_ref3) {
				var activeSortable = _ref3.activeSortable,
					putSortable = _ref3.putSortable,
					dragEl = _ref3.dragEl;
				var toSortable = putSortable || this.sortable;
				var options = this.options;
				lastSwapEl && toggleClass(lastSwapEl, options.swapClass, false);

				if (lastSwapEl && (options.swap || putSortable && putSortable.options.swap)) {
					if (dragEl !== lastSwapEl) {
						toSortable.captureAnimationState();
						if (toSortable !== activeSortable) activeSortable.captureAnimationState();
						swapNodes(dragEl, lastSwapEl);
						toSortable.animateAll();
						if (toSortable !== activeSortable) activeSortable.animateAll();
					}
				}
			},
			nulling: function nulling() {
				lastSwapEl = null;
			}
		};
		return _extends(Swap, {
			pluginName: 'swap',
			eventProperties: function eventProperties() {
				return {
					swapItem: lastSwapEl
				};
			}
		});
	}

	function swapNodes(n1, n2) {
		var p1 = n1.parentNode,
			p2 = n2.parentNode,
			i1,
			i2;
		if (!p1 || !p2 || p1.isEqualNode(n2) || p2.isEqualNode(n1)) return;
		i1 = index(n1);
		i2 = index(n2);

		if (p1.isEqualNode(p2) && i1 < i2) {
			i2++;
		}

		p1.insertBefore(n2, p1.children[i1]);
		p2.insertBefore(n1, p2.children[i2]);
	}


	Sortable.mount(Remove, Revert);
	Sortable.mount(new SwapPlugin());

	return Sortable;

}));