diff --git a/dist/html.sortable.js b/dist/html.sortable.js
index a0218660..164b6eaa 100644
--- a/dist/html.sortable.js
+++ b/dist/html.sortable.js
@@ -466,6 +466,11 @@ var _getChildren = function (element) {
   return element.children
 }
 
+var _serialize = function (list) {
+  var children = _filter(_getChildren(list), _data(list, 'items'))
+  return children
+}
+
 /*
  * Public sortable object
  * @param {Array|NodeList} sortableElements
@@ -505,12 +510,22 @@ var sortable = function (sortableElements, options) {
 
   sortableElements = Array.prototype.slice.call(sortableElements)
 
+  if (/serialize/.test(method)) {
+    var serialized = []
+    sortableElements.forEach(function (sortableElement) {
+      serialized.push({
+        list: sortableElement,
+        children: _serialize(sortableElement)
+      })
+    })
+    return serialized
+  }
+
   /* TODO: maxstatements should be 25, fix and remove line below */
   /* jshint maxstatements:false */
   sortableElements.forEach(function (sortableElement) {
     if (/enable|disable|destroy/.test(method)) {
-      sortable[method](sortableElement)
-      return
+      return sortable[method](sortableElement)
     }
 
     // get options & set options on sortable
@@ -522,6 +537,7 @@ var sortable = function (sortableElements, options) {
     var items = _filter(_getChildren(sortableElement), options.items)
     var index
     var startParent
+    var startList
     var placeholder = options.placeholder
     var maxItems
     if (!placeholder) {
@@ -590,6 +606,7 @@ var sortable = function (sortableElements, options) {
       index = _index(dragging)
       draggingHeight = parseInt(window.getComputedStyle(dragging).height)
       startParent = this.parentElement
+      startList = _serialize(startParent)
       // dispatch sortstart event on each element in group
       _dispatchEventOnConnected(sortableElement, _makeEvent('sortstart', {
         item: dragging,
@@ -624,7 +641,10 @@ var sortable = function (sortableElements, options) {
           elementIndex: _index(dragging),
           oldElementIndex: index,
           startparent: startParent,
-          endparent: newParent
+          endparent: newParent,
+          newEndList: _serialize(newParent),
+          newStartList: _serialize(startParent),
+          oldStartList: startList
         }))
       }
       dragging = null
diff --git a/dist/html.sortable.min.js b/dist/html.sortable.min.js
index a95ccb51..89e98925 100644
--- a/dist/html.sortable.min.js
+++ b/dist/html.sortable.min.js
@@ -1,2 +1,2 @@
-!function(e,t){"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?module.exports=t():e.sortable=t()}(this,function(){"use strict";function e(e,t,n){var r=null;return 0===t?e:function(){var a=n||this,o=arguments;clearTimeout(r),r=setTimeout(function(){e.apply(a,o)},t)}}var t,n,r=[],a=[],o=function(e,t,n){return void 0===n?e&&e.h5s&&e.h5s.data&&e.h5s.data[t]:(e.h5s=e.h5s||{},e.h5s.data=e.h5s.data||{},e.h5s.data[t]=n,void 0)},i=function(e){e.h5s&&delete e.h5s.data},s=function(e,t){return(e.matches||e.matchesSelector||e.msMatchesSelector||e.mozMatchesSelector||e.webkitMatchesSelector||e.oMatchesSelector).call(e,t)},l=function(e,t){if(!t)return Array.prototype.slice.call(e);for(var n=[],r=0;r<e.length;++r)"string"==typeof t&&s(e[r],t)&&n.push(e[r]),t.indexOf(e[r])!==-1&&n.push(e[r]);return n},d=function(e,t,n){if(e instanceof Array)for(var r=0;r<e.length;++r)d(e[r],t,n);else e.addEventListener(t,n),e.h5s=e.h5s||{},e.h5s.events=e.h5s.events||{},e.h5s.events[t]=n},c=function(e,t){if(e instanceof Array)for(var n=0;n<e.length;++n)c(e[n],t);else e.h5s&&e.h5s.events&&e.h5s.events[t]&&(e.removeEventListener(t,e.h5s.events[t]),delete e.h5s.events[t])},f=function(e,t,n){if(e instanceof Array)for(var r=0;r<e.length;++r)f(e[r],t,n);else e.setAttribute(t,n)},u=function(e,t){if(e instanceof Array)for(var n=0;n<e.length;++n)u(e[n],t);else e.removeAttribute(t)},p=function(e){var t=e.getClientRects()[0];return{left:t.left+window.scrollX,top:t.top+window.scrollY}},h=function(e){c(e,"dragstart"),c(e,"dragend"),c(e,"selectstart"),c(e,"dragover"),c(e,"dragenter"),c(e,"drop")},g=function(e){c(e,"dragover"),c(e,"dragenter"),c(e,"drop")},m=function(e,t){e.dataTransfer.effectAllowed="move",e.dataTransfer.setData("text",""),e.dataTransfer.setDragImage&&e.dataTransfer.setDragImage(t.draggedItem,t.x,t.y)},v=function(e,t){return t.x||(t.x=parseInt(e.pageX-p(t.draggedItem).left)),t.y||(t.y=parseInt(e.pageY-p(t.draggedItem).top)),t},y=function(e){return{draggedItem:e}},b=function(e,t){var n=y(t);n=v(e,n),m(e,n)},E=function(e){i(e),u(e,"aria-dropeffect")},x=function(e){u(e,"aria-grabbed"),u(e,"draggable"),u(e,"role")},I=function(e,t){return e===t||void 0!==o(e,"connectWith")&&o(e,"connectWith")===o(t,"connectWith")},w=function(e,t){var n,r=[];if(!t)return e;for(var a=0;a<e.length;++a)n=e[a].querySelectorAll(t),r=r.concat(Array.prototype.slice.call(n));return r},C=function(e){var t=o(e,"opts")||{},n=l(Y(e),t.items),r=w(n,t.handle);g(e),E(e),c(r,"mousedown"),h(n),x(n)},A=function(e){var t=o(e,"opts"),n=l(Y(e),t.items),r=w(n,t.handle);f(e,"aria-dropeffect","move"),o(e,"_disabled","false"),f(r,"draggable","true");var a=(document||window.document).createElement("span");"function"!=typeof a.dragDrop||t.disableIEFix||d(r,"mousedown",function(){if(n.indexOf(this)!==-1)this.dragDrop();else{for(var e=this.parentElement;n.indexOf(e)===-1;)e=e.parentElement;e.dragDrop()}})},D=function(e){var t=o(e,"opts"),n=l(Y(e),t.items),r=w(n,t.handle);f(e,"aria-dropeffect","none"),o(e,"_disabled","true"),f(r,"draggable","false"),c(r,"mousedown")},S=function(e){var t=o(e,"opts"),n=l(Y(e),t.items),r=w(n,t.handle);o(e,"_disabled","false"),h(n),c(r,"mousedown"),g(e)},L=function(e){return e.parentElement?Array.prototype.indexOf.call(e.parentElement.children,e):0},O=function(e){return!!e.parentNode},T=function(e,t){if("string"!=typeof e)return e;var n=document.createElement(t);return n.innerHTML=e,n.firstChild},W=function(e,t){e.parentElement.insertBefore(t,e)},M=function(e,t){e.parentElement.insertBefore(t,e.nextElementSibling)},N=function(e){e.parentNode&&e.parentNode.removeChild(e)},P=function(e,t){var n=document.createEvent("Event");return t&&(n.detail=t),n.initEvent(e,!1,!0),n},_=function(e,t){a.forEach(function(n){I(e,n)&&n.dispatchEvent(t)})},Y=function(e){return e.children},q=function(i,c){var u=String(c);return c=function(e){var t={connectWith:!1,placeholder:null,disableIEFix:!1,placeholderClass:"sortable-placeholder",draggingClass:"sortable-dragging",hoverClass:!1,debounce:0,maxItems:0};for(var n in e)t[n]=e[n];return t}(c),c&&"function"==typeof c.getChildren&&(Y=c.getChildren),"string"==typeof i&&(i=document.querySelectorAll(i)),i instanceof window.Element&&(i=[i]),i=Array.prototype.slice.call(i),i.forEach(function(i){if(/enable|disable|destroy/.test(u))return void q[u](i);c=o(i,"opts")||c,o(i,"opts",c),S(i);var h,g,m,v=l(Y(i),c.items),y=c.placeholder;if(y||(y=document.createElement(/^ul|ol$/i.test(i.tagName)?"li":"div")),y=T(y,i.tagName),y.classList.add.apply(y.classList,c.placeholderClass.split(" ")),!i.getAttribute("data-sortable-id")){var E=a.length;a[E]=i,f(i,"data-sortable-id",E),f(v,"data-item-sortable-id",E)}if(o(i,"items",c.items),r.push(y),c.connectWith&&o(i,"connectWith",c.connectWith),A(i),f(v,"role","option"),f(v,"aria-grabbed","false"),c.hoverClass){var x="sortable-over";"string"==typeof c.hoverClass&&(x=c.hoverClass),d(v,"mouseenter",function(){this.classList.add(x)}),d(v,"mouseleave",function(){this.classList.remove(x)})}c.maxItems&&"number"==typeof c.maxItems&&(m=c.maxItems),d(v,"dragstart",function(e){e.stopImmediatePropagation(),c.handle&&!s(e.target,c.handle)||"false"===this.getAttribute("draggable")||(b(e,this),this.classList.add(c.draggingClass),t=this,f(t,"aria-grabbed","true"),h=L(t),n=parseInt(window.getComputedStyle(t).height),g=this.parentElement,_(i,P("sortstart",{item:t,placeholder:y,startparent:g})))}),d(v,"dragend",function(){var e;t&&(t.classList.remove(c.draggingClass),f(t,"aria-grabbed","false"),t.style.display=t.oldDisplay,delete t.oldDisplay,r.forEach(N),e=this.parentElement,_(i,P("sortstop",{item:t,startparent:g})),h===L(t)&&g===e||_(i,P("sortupdate",{item:t,index:l(Y(e),o(e,"items")).indexOf(t),oldindex:v.indexOf(t),elementIndex:L(t),oldElementIndex:h,startparent:g,endparent:e})),t=null,n=null)}),d([i,y],"drop",function(e){var n;I(i,t.parentElement)&&(e.preventDefault(),e.stopPropagation(),n=r.filter(O)[0],M(n,t),t.dispatchEvent(P("dragend")))});var w=e(function(e,a){if(t)if(v.indexOf(e)!==-1){var o=parseInt(window.getComputedStyle(e).height),i=L(y),s=L(e);if(c.forcePlaceholderSize&&(y.style.height=n+"px"),o>n){var d=o-n,f=p(e).top;if(i<s&&a<f+d)return;if(i>s&&a>f+o-d)return}void 0===t.oldDisplay&&(t.oldDisplay=t.style.display),"none"!==t.style.display&&(t.style.display="none"),i<s?M(e,y):W(e,y),r.filter(function(e){return e!==y}).forEach(N)}else r.indexOf(e)!==-1||l(Y(e),c.items).length||(r.forEach(N),e.appendChild(y))},c.debounce),C=function(e){t&&I(i,t.parentElement)&&"true"!==o(i,"_disabled")&&(m&&l(Y(i),o(i,"items")).length>=m||(e.preventDefault(),e.stopPropagation(),e.dataTransfer.dropEffect="move",w(this,e.pageY)))};d(v.concat(i),"dragover",C),d(v.concat(i),"dragenter",C)}),i};return q.destroy=function(e){C(e)},q.enable=function(e){A(e)},q.disable=function(e){D(e)},q});
+!function(e,t){"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?module.exports=t():e.sortable=t()}(this,function(){"use strict";function e(e,t,n){var r=null;return 0===t?e:function(){var a=n||this,o=arguments;clearTimeout(r),r=setTimeout(function(){e.apply(a,o)},t)}}var t,n,r=[],a=[],o=function(e,t,n){return void 0===n?e&&e.h5s&&e.h5s.data&&e.h5s.data[t]:(e.h5s=e.h5s||{},e.h5s.data=e.h5s.data||{},e.h5s.data[t]=n,void 0)},i=function(e){e.h5s&&delete e.h5s.data},s=function(e,t){return(e.matches||e.matchesSelector||e.msMatchesSelector||e.mozMatchesSelector||e.webkitMatchesSelector||e.oMatchesSelector).call(e,t)},l=function(e,t){if(!t)return Array.prototype.slice.call(e);for(var n=[],r=0;r<e.length;++r)"string"==typeof t&&s(e[r],t)&&n.push(e[r]),t.indexOf(e[r])!==-1&&n.push(e[r]);return n},d=function(e,t,n){if(e instanceof Array)for(var r=0;r<e.length;++r)d(e[r],t,n);else e.addEventListener(t,n),e.h5s=e.h5s||{},e.h5s.events=e.h5s.events||{},e.h5s.events[t]=n},c=function(e,t){if(e instanceof Array)for(var n=0;n<e.length;++n)c(e[n],t);else e.h5s&&e.h5s.events&&e.h5s.events[t]&&(e.removeEventListener(t,e.h5s.events[t]),delete e.h5s.events[t])},f=function(e,t,n){if(e instanceof Array)for(var r=0;r<e.length;++r)f(e[r],t,n);else e.setAttribute(t,n)},u=function(e,t){if(e instanceof Array)for(var n=0;n<e.length;++n)u(e[n],t);else e.removeAttribute(t)},p=function(e){var t=e.getClientRects()[0];return{left:t.left+window.scrollX,top:t.top+window.scrollY}},h=function(e){c(e,"dragstart"),c(e,"dragend"),c(e,"selectstart"),c(e,"dragover"),c(e,"dragenter"),c(e,"drop")},g=function(e){c(e,"dragover"),c(e,"dragenter"),c(e,"drop")},m=function(e,t){e.dataTransfer.effectAllowed="move",e.dataTransfer.setData("text",""),e.dataTransfer.setDragImage&&e.dataTransfer.setDragImage(t.draggedItem,t.x,t.y)},v=function(e,t){return t.x||(t.x=parseInt(e.pageX-p(t.draggedItem).left)),t.y||(t.y=parseInt(e.pageY-p(t.draggedItem).top)),t},y=function(e){return{draggedItem:e}},b=function(e,t){var n=y(t);n=v(e,n),m(e,n)},E=function(e){i(e),u(e,"aria-dropeffect")},x=function(e){u(e,"aria-grabbed"),u(e,"draggable"),u(e,"role")},w=function(e,t){return e===t||void 0!==o(e,"connectWith")&&o(e,"connectWith")===o(t,"connectWith")},I=function(e,t){var n,r=[];if(!t)return e;for(var a=0;a<e.length;++a)n=e[a].querySelectorAll(t),r=r.concat(Array.prototype.slice.call(n));return r},C=function(e){var t=o(e,"opts")||{},n=l(z(e),t.items),r=I(n,t.handle);g(e),E(e),c(r,"mousedown"),h(n),x(n)},A=function(e){var t=o(e,"opts"),n=l(z(e),t.items),r=I(n,t.handle);f(e,"aria-dropeffect","move"),o(e,"_disabled","false"),f(r,"draggable","true");var a=(document||window.document).createElement("span");"function"!=typeof a.dragDrop||t.disableIEFix||d(r,"mousedown",function(){if(n.indexOf(this)!==-1)this.dragDrop();else{for(var e=this.parentElement;n.indexOf(e)===-1;)e=e.parentElement;e.dragDrop()}})},S=function(e){var t=o(e,"opts"),n=l(z(e),t.items),r=I(n,t.handle);f(e,"aria-dropeffect","none"),o(e,"_disabled","true"),f(r,"draggable","false"),c(r,"mousedown")},D=function(e){var t=o(e,"opts"),n=l(z(e),t.items),r=I(n,t.handle);o(e,"_disabled","false"),h(n),c(r,"mousedown"),g(e)},L=function(e){return e.parentElement?Array.prototype.indexOf.call(e.parentElement.children,e):0},O=function(e){return!!e.parentNode},T=function(e,t){if("string"!=typeof e)return e;var n=document.createElement(t);return n.innerHTML=e,n.firstChild},W=function(e,t){e.parentElement.insertBefore(t,e)},M=function(e,t){e.parentElement.insertBefore(t,e.nextElementSibling)},N=function(e){e.parentNode&&e.parentNode.removeChild(e)},P=function(e,t){var n=document.createEvent("Event");return t&&(n.detail=t),n.initEvent(e,!1,!0),n},_=function(e,t){a.forEach(function(n){w(e,n)&&n.dispatchEvent(t)})},z=function(e){return e.children},Y=function(e){var t=l(z(e),o(e,"items"));return t},q=function(i,c){var u=String(c);if(c=function(e){var t={connectWith:!1,placeholder:null,disableIEFix:!1,placeholderClass:"sortable-placeholder",draggingClass:"sortable-dragging",hoverClass:!1,debounce:0,maxItems:0};for(var n in e)t[n]=e[n];return t}(c),c&&"function"==typeof c.getChildren&&(z=c.getChildren),"string"==typeof i&&(i=document.querySelectorAll(i)),i instanceof window.Element&&(i=[i]),i=Array.prototype.slice.call(i),/serialize/.test(u)){var h=[];return i.forEach(function(e){h.push({list:e,children:Y(e)})}),h}return i.forEach(function(i){if(/enable|disable|destroy/.test(u))return q[u](i);c=o(i,"opts")||c,o(i,"opts",c),D(i);var h,g,m,v,y=l(z(i),c.items),E=c.placeholder;if(E||(E=document.createElement(/^ul|ol$/i.test(i.tagName)?"li":"div")),E=T(E,i.tagName),E.classList.add.apply(E.classList,c.placeholderClass.split(" ")),!i.getAttribute("data-sortable-id")){var x=a.length;a[x]=i,f(i,"data-sortable-id",x),f(y,"data-item-sortable-id",x)}if(o(i,"items",c.items),r.push(E),c.connectWith&&o(i,"connectWith",c.connectWith),A(i),f(y,"role","option"),f(y,"aria-grabbed","false"),c.hoverClass){var I="sortable-over";"string"==typeof c.hoverClass&&(I=c.hoverClass),d(y,"mouseenter",function(){this.classList.add(I)}),d(y,"mouseleave",function(){this.classList.remove(I)})}c.maxItems&&"number"==typeof c.maxItems&&(v=c.maxItems),d(y,"dragstart",function(e){e.stopImmediatePropagation(),c.handle&&!s(e.target,c.handle)||"false"===this.getAttribute("draggable")||(b(e,this),this.classList.add(c.draggingClass),t=this,f(t,"aria-grabbed","true"),h=L(t),n=parseInt(window.getComputedStyle(t).height),g=this.parentElement,m=Y(g),_(i,P("sortstart",{item:t,placeholder:E,startparent:g})))}),d(y,"dragend",function(){var e;t&&(t.classList.remove(c.draggingClass),f(t,"aria-grabbed","false"),t.style.display=t.oldDisplay,delete t.oldDisplay,r.forEach(N),e=this.parentElement,_(i,P("sortstop",{item:t,startparent:g})),h===L(t)&&g===e||_(i,P("sortupdate",{item:t,index:l(z(e),o(e,"items")).indexOf(t),oldindex:y.indexOf(t),elementIndex:L(t),oldElementIndex:h,startparent:g,endparent:e,newEndList:Y(e),newStartList:Y(g),oldStartList:m})),t=null,n=null)}),d([i,E],"drop",function(e){var n;w(i,t.parentElement)&&(e.preventDefault(),e.stopPropagation(),n=r.filter(O)[0],M(n,t),t.dispatchEvent(P("dragend")))});var C=e(function(e,a){if(t)if(y.indexOf(e)!==-1){var o=parseInt(window.getComputedStyle(e).height),i=L(E),s=L(e);if(c.forcePlaceholderSize&&(E.style.height=n+"px"),o>n){var d=o-n,f=p(e).top;if(i<s&&a<f+d)return;if(i>s&&a>f+o-d)return}void 0===t.oldDisplay&&(t.oldDisplay=t.style.display),"none"!==t.style.display&&(t.style.display="none"),i<s?M(e,E):W(e,E),r.filter(function(e){return e!==E}).forEach(N)}else r.indexOf(e)!==-1||l(z(e),c.items).length||(r.forEach(N),e.appendChild(E))},c.debounce),S=function(e){t&&w(i,t.parentElement)&&"true"!==o(i,"_disabled")&&(v&&l(z(i),o(i,"items")).length>=v||(e.preventDefault(),e.stopPropagation(),e.dataTransfer.dropEffect="move",C(this,e.pageY)))};d(y.concat(i),"dragover",S),d(y.concat(i),"dragenter",S)}),i};return q.destroy=function(e){C(e)},q.enable=function(e){A(e)},q.disable=function(e){S(e)},q});
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diff --git a/dist/html.sortable.min.js.map b/dist/html.sortable.min.js.map
index dccde2c2..6a7d070a 100644
--- a/dist/html.sortable.min.js.map
+++ b/dist/html.sortable.min.js.map
@@ -1 +1 @@
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Comparable to jQuery's $(el).is('.my-class')\n * @param {el} DOM element\n * @param {selector} selector test against the element\n * @returns {boolean}\n */\n/* istanbul ignore next */\nvar _matches = function (el, selector) {\n  return (el.matches || el.matchesSelector || el.msMatchesSelector || el.mozMatchesSelector || el.webkitMatchesSelector || el.oMatchesSelector).call(el, selector)\n}\n/**\n * Filter only wanted nodes\n * @param {Array|NodeList} nodes\n * @param {Array/string} wanted\n * @returns {Array}\n */\nvar _filter = function (nodes, wanted) {\n  if (!wanted) {\n    return Array.prototype.slice.call(nodes)\n  }\n  var result = []\n  for (var i = 0; i < nodes.length; ++i) {\n    if (typeof wanted === 'string' && _matches(nodes[i], wanted)) {\n      result.push(nodes[i])\n    }\n    if (wanted.indexOf(nodes[i]) !== -1) {\n      result.push(nodes[i])\n    }\n  }\n  return result\n}\n/**\n * @param {Array|Element} element\n * @param {Array|string} event\n * @param {Function} callback\n */\nvar _on = function (element, event, callback) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _on(element[i], event, callback)\n    }\n    return\n  }\n  element.addEventListener(event, callback)\n  element.h5s = element.h5s || {}\n  element.h5s.events = element.h5s.events || {}\n  element.h5s.events[event] = callback\n}\n/**\n * @param {Array|Element} element\n * @param {Array|string} event\n */\nvar _off = function (element, event) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _off(element[i], event)\n    }\n    return\n  }\n  if (element.h5s && element.h5s.events && element.h5s.events[event]) {\n    element.removeEventListener(event, element.h5s.events[event])\n    delete element.h5s.events[event]\n  }\n}\n/**\n * @param {Array|Element} element\n * @param {string} attribute\n * @param {*} value\n */\nvar _attr = function (element, attribute, value) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _attr(element[i], attribute, value)\n    }\n    return\n  }\n  element.setAttribute(attribute, value)\n}\n/**\n * @param {Array|Element} element\n * @param {string} attribute\n */\nvar _removeAttr = function (element, attribute) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _removeAttr(element[i], attribute)\n    }\n    return\n  }\n  element.removeAttribute(attribute)\n}\n/**\n * @param {Element} element\n * @returns {{left: *, top: *}}\n */\nvar _offset = function (element) {\n  var rect = element.getClientRects()[0]\n  return {\n    left: rect.left + window.scrollX,\n    top: rect.top + window.scrollY\n  }\n}\n/*\n * remove event handlers from items\n * @param {Array|NodeList} items\n */\nvar _removeItemEvents = function (items) {\n  _off(items, 'dragstart')\n  _off(items, 'dragend')\n  _off(items, 'selectstart')\n  _off(items, 'dragover')\n  _off(items, 'dragenter')\n  _off(items, 'drop')\n}\n/*\n * Remove event handlers from sortable\n * @param {Element} sortable a single sortable\n */\nvar _removeSortableEvents = function (sortable) {\n  _off(sortable, 'dragover')\n  _off(sortable, 'dragenter')\n  _off(sortable, 'drop')\n}\n/*\n * Attach ghost to dataTransfer object\n * @param {Event} original event\n * @param {object} ghost-object with item, x and y coordinates\n */\nvar _attachGhost = function (event, ghost) {\n  // this needs to be set for HTML5 drag & drop to work\n  event.dataTransfer.effectAllowed = 'move'\n  event.dataTransfer.setData('text', '')\n\n  // check if setDragImage method is available\n  if (event.dataTransfer.setDragImage) {\n    event.dataTransfer.setDragImage(ghost.draggedItem, ghost.x, ghost.y)\n  }\n}\n/**\n * _addGhostPos clones the dragged item and adds it as a Ghost item\n * @param {Event} event - the event fired when dragstart is triggered\n * @param {object} ghost - .draggedItem = Element\n */\nvar _addGhostPos = function (event, ghost) {\n  if (!ghost.x) {\n    ghost.x = parseInt(event.pageX - _offset(ghost.draggedItem).left)\n  }\n  if (!ghost.y) {\n    ghost.y = parseInt(event.pageY - _offset(ghost.draggedItem).top)\n  }\n  return ghost\n}\n/**\n * _makeGhost decides which way to make a ghost and passes it to attachGhost\n * @param {Element} draggedItem - the item that the user drags\n */\nvar _makeGhost = function (draggedItem) {\n  return {\n    draggedItem: draggedItem\n  }\n}\n/**\n * _getGhost constructs ghost and attaches it to dataTransfer\n * @param {Event} event - the original drag event object\n * @param {Element} draggedItem - the item that the user drags\n */\n// TODO: could draggedItem be replaced by event.target in all instances\nvar _getGhost = function (event, draggedItem) {\n  // add ghost item & draggedItem to ghost object\n  var ghost = _makeGhost(draggedItem)\n  // attach ghost position\n  ghost = _addGhostPos(event, ghost)\n  // attach ghost to dataTransfer\n  _attachGhost(event, ghost)\n}\n/*\n * Remove data from sortable\n * @param {Element} sortable a single sortable\n */\nvar _removeSortableData = function (sortable) {\n  _removeData(sortable)\n  _removeAttr(sortable, 'aria-dropeffect')\n}\n/*\n * Remove data from items\n * @param {Array|Element} items\n */\nvar _removeItemData = function (items) {\n  _removeAttr(items, 'aria-grabbed')\n  _removeAttr(items, 'draggable')\n  _removeAttr(items, 'role')\n}\n/*\n * Check if two lists are connected\n * @param {Element} curList\n * @param {Element} destList\n */\nvar _listsConnected = function (curList, destList) {\n  if (curList === destList) {\n    return true\n  }\n  if (_data(curList, 'connectWith') !== undefined) {\n    return _data(curList, 'connectWith') === _data(destList, 'connectWith')\n  }\n  return false\n}\n/*\n * get handle or return item\n * @param {Array} items\n * @param {selector} handle\n */\nvar _getHandles = function (items, handle) {\n  var result = []\n  var handles\n  if (!handle) {\n    return items\n  }\n  for (var i = 0; i < items.length; ++i) {\n    handles = items[i].querySelectorAll(handle)\n    result = result.concat(Array.prototype.slice.call(handles))\n  }\n  return result\n}\n/*\n * Destroy the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _destroySortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts') || {}\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  // remove event handlers & data from sortable\n  _removeSortableEvents(sortableElement)\n  _removeSortableData(sortableElement)\n  // remove event handlers & data from items\n  _off(handles, 'mousedown')\n  _removeItemEvents(items)\n  _removeItemData(items)\n}\n/*\n * Enable the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _enableSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _attr(sortableElement, 'aria-dropeffect', 'move')\n  _data(sortableElement, '_disabled', 'false')\n  _attr(handles, 'draggable', 'true')\n  // IE FIX for ghost\n  // can be disabled as it has the side effect that other events\n  // (e.g. click) will be ignored\n  var spanEl = (document || window.document).createElement('span')\n  if (typeof spanEl.dragDrop === 'function' && !opts.disableIEFix) {\n    _on(handles, 'mousedown', function () {\n      if (items.indexOf(this) !== -1) {\n        this.dragDrop()\n      } else {\n        var parent = this.parentElement\n        while (items.indexOf(parent) === -1) {\n          parent = parent.parentElement\n        }\n        parent.dragDrop()\n      }\n    })\n  }\n}\n/*\n * Disable the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _disableSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _attr(sortableElement, 'aria-dropeffect', 'none')\n  _data(sortableElement, '_disabled', 'true')\n  _attr(handles, 'draggable', 'false')\n  _off(handles, 'mousedown')\n}\n/*\n * Reload the sortable\n * @param {Element} sortableElement a single sortable\n * @description events need to be removed to not be double bound\n */\nvar _reloadSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _data(sortableElement, '_disabled', 'false')\n  // remove event handlers from items\n  _removeItemEvents(items)\n  _off(handles, 'mousedown')\n  // remove event handlers from sortable\n  _removeSortableEvents(sortableElement)\n}\n/**\n * Get position of the element relatively to its sibling elements\n * @param {Element} element\n * @returns {number}\n */\nvar _index = function (element) {\n  if (!element.parentElement) {\n    return 0\n  }\n  return Array.prototype.indexOf.call(element.parentElement.children, element)\n}\n/**\n * Whether element is in DOM\n * @param {Element} element\n * @returns {boolean}\n */\nvar _attached = function (element) {\n  // document.body.contains(element)\n  return !!element.parentNode\n}\n/**\n * Convert HTML string into DOM element.\n * @param {Element|string} html\n * @param {string} tagname\n * @returns {Element}\n */\nvar _html2element = function (html, tagName) {\n  if (typeof html !== 'string') {\n    return html\n  }\n  var parentElement = document.createElement(tagName)\n  parentElement.innerHTML = html\n  return parentElement.firstChild\n}\n/**\n * Insert before target\n * @param {Element} target\n * @param {Element} element\n */\nvar _before = function (target, element) {\n  target.parentElement.insertBefore(\n    element,\n    target\n  )\n}\n/**\n * Insert after target\n * @param {Element} target\n * @param {Element} element\n */\nvar _after = function (target, element) {\n  target.parentElement.insertBefore(\n    element,\n    target.nextElementSibling\n  )\n}\n/**\n * Detach element from DOM\n * @param {Element} element\n */\nvar _detach = function (element) {\n  if (element.parentNode) {\n    element.parentNode.removeChild(element)\n  }\n}\n/**\n * Make native event that can be dispatched afterwards\n * @param {string} name\n * @param {object} detail\n * @returns {CustomEvent}\n */\nvar _makeEvent = function (name, detail) {\n  var e = document.createEvent('Event')\n  if (detail) {\n    e.detail = detail\n  }\n  e.initEvent(name, false, true)\n  return e\n}\n/**\n * @param {Element} sortableElement\n * @param {CustomEvent} event\n */\nvar _dispatchEventOnConnected = function (sortableElement, event) {\n  sortables.forEach(function (target) {\n    if (_listsConnected(sortableElement, target)) {\n      target.dispatchEvent(event)\n    }\n  })\n}\n\n/**\n * Creates and returns a new debounced version of the passed function which will postpone its execution until after wait milliseconds have elapsed\n * @param {fn} Function to debounce\n * @param {delay} time to wait before calling function with latest arguments, 0 - no debounce\n * @param {context} time to wait before calling function with latest arguments, 0 - no debounce\n * @returns {function} - debounced function\n */\nfunction _debounce (fn, delay, context) {\n  var timer = null\n\n  if (delay === 0) {\n    return fn\n  }\n  return function () {\n    var eContext = context || this\n    var args = arguments\n    clearTimeout(timer)\n    timer = setTimeout(function () {\n      fn.apply(eContext, args)\n    }, delay)\n  }\n}\n\nvar _getChildren = function (element) {\n  return element.children\n}\n\n/*\n * Public sortable object\n * @param {Array|NodeList} sortableElements\n * @param {object|string} options|method\n */\nvar sortable = function (sortableElements, options) {\n  var method = String(options)\n\n  options = (function (options) {\n    var result = {\n      connectWith: false,\n      placeholder: null,\n      disableIEFix: false,\n      placeholderClass: 'sortable-placeholder',\n      draggingClass: 'sortable-dragging',\n      hoverClass: false,\n      debounce: 0,\n      maxItems: 0\n    }\n    for (var option in options) {\n      result[option] = options[option]\n    }\n    return result\n  })(options)\n\n  if (options && typeof options.getChildren === 'function') {\n    _getChildren = options.getChildren\n  }\n\n  if (typeof sortableElements === 'string') {\n    sortableElements = document.querySelectorAll(sortableElements)\n  }\n\n  if (sortableElements instanceof window.Element) {\n    sortableElements = [sortableElements]\n  }\n\n  sortableElements = Array.prototype.slice.call(sortableElements)\n\n  /* TODO: maxstatements should be 25, fix and remove line below */\n  /* jshint maxstatements:false */\n  sortableElements.forEach(function (sortableElement) {\n    if (/enable|disable|destroy/.test(method)) {\n      sortable[method](sortableElement)\n      return\n    }\n\n    // get options & set options on sortable\n    options = _data(sortableElement, 'opts') || options\n    _data(sortableElement, 'opts', options)\n    // reset sortable\n    _reloadSortable(sortableElement)\n    // initialize\n    var items = _filter(_getChildren(sortableElement), options.items)\n    var index\n    var startParent\n    var placeholder = options.placeholder\n    var maxItems\n    if (!placeholder) {\n      placeholder = document.createElement(\n        /^ul|ol$/i.test(sortableElement.tagName) ? 'li' : 'div'\n      )\n    }\n    placeholder = _html2element(placeholder, sortableElement.tagName)\n    placeholder.classList.add.apply(\n      placeholder.classList,\n      options.placeholderClass.split(' ')\n    )\n\n    // setup sortable ids\n    if (!sortableElement.getAttribute('data-sortable-id')) {\n      var id = sortables.length\n      sortables[id] = sortableElement\n      _attr(sortableElement, 'data-sortable-id', id)\n      _attr(items, 'data-item-sortable-id', id)\n    }\n\n    _data(sortableElement, 'items', options.items)\n    placeholders.push(placeholder)\n    if (options.connectWith) {\n      _data(sortableElement, 'connectWith', options.connectWith)\n    }\n\n    _enableSortable(sortableElement)\n    _attr(items, 'role', 'option')\n    _attr(items, 'aria-grabbed', 'false')\n\n    // Mouse over class\n    if (options.hoverClass) {\n      var hoverClass = 'sortable-over'\n      if (typeof options.hoverClass === 'string') {\n        hoverClass = options.hoverClass\n      }\n\n      _on(items, 'mouseenter', function () {\n        this.classList.add(hoverClass)\n      })\n      _on(items, 'mouseleave', function () {\n        this.classList.remove(hoverClass)\n      })\n    }\n\n    // max items\n    if (options.maxItems && typeof options.maxItems === 'number') {\n      maxItems = options.maxItems\n    }\n\n    // Handle drag events on draggable items\n    _on(items, 'dragstart', function (e) {\n      e.stopImmediatePropagation()\n      if ((options.handle && !_matches(e.target, options.handle)) || this.getAttribute('draggable') === 'false') {\n        return\n      }\n\n      // add transparent clone or other ghost to cursor\n      _getGhost(e, this)\n      // cache selsection & add attr for dragging\n      this.classList.add(options.draggingClass)\n      dragging = this\n      _attr(dragging, 'aria-grabbed', 'true')\n      // grab values\n      index = _index(dragging)\n      draggingHeight = parseInt(window.getComputedStyle(dragging).height)\n      startParent = this.parentElement\n      // dispatch sortstart event on each element in group\n      _dispatchEventOnConnected(sortableElement, _makeEvent('sortstart', {\n        item: dragging,\n        placeholder: placeholder,\n        startparent: startParent\n      }))\n    })\n    // Handle drag events on draggable items\n    _on(items, 'dragend', function () {\n      var newParent\n      if (!dragging) {\n        return\n      }\n      // remove dragging attributes and show item\n      dragging.classList.remove(options.draggingClass)\n      _attr(dragging, 'aria-grabbed', 'false')\n      dragging.style.display = dragging.oldDisplay\n      delete dragging.oldDisplay\n\n      placeholders.forEach(_detach)\n      newParent = this.parentElement\n      _dispatchEventOnConnected(sortableElement, _makeEvent('sortstop', {\n        item: dragging,\n        startparent: startParent\n      }))\n      if (index !== _index(dragging) || startParent !== newParent) {\n        _dispatchEventOnConnected(sortableElement, _makeEvent('sortupdate', {\n          item: dragging,\n          index: _filter(_getChildren(newParent), _data(newParent, 'items'))\n              .indexOf(dragging),\n          oldindex: items.indexOf(dragging),\n          elementIndex: _index(dragging),\n          oldElementIndex: index,\n          startparent: startParent,\n          endparent: newParent\n        }))\n      }\n      dragging = null\n      draggingHeight = null\n    })\n    // Handle drop event on sortable & placeholder\n    // TODO: REMOVE placeholder?????\n    _on([sortableElement, placeholder], 'drop', function (e) {\n      var visiblePlaceholder\n      if (!_listsConnected(sortableElement, dragging.parentElement)) {\n        return\n      }\n\n      e.preventDefault()\n      e.stopPropagation()\n      visiblePlaceholder = placeholders.filter(_attached)[0]\n      _after(visiblePlaceholder, dragging)\n      dragging.dispatchEvent(_makeEvent('dragend'))\n    })\n\n    var debouncedDragOverEnter = _debounce(function (element, pageY) {\n      if (!dragging) {\n        return\n      }\n\n      if (items.indexOf(element) !== -1) {\n        var thisHeight = parseInt(window.getComputedStyle(element).height)\n        var placeholderIndex = _index(placeholder)\n        var thisIndex = _index(element)\n        if (options.forcePlaceholderSize) {\n          placeholder.style.height = draggingHeight + 'px'\n        }\n\n        // Check if `element` is bigger than the draggable. If it is, we have to define a dead zone to prevent flickering\n        if (thisHeight > draggingHeight) {\n          // Dead zone?\n          var deadZone = thisHeight - draggingHeight\n          var offsetTop = _offset(element).top\n          if (placeholderIndex < thisIndex &&\n              pageY < offsetTop + deadZone) {\n            return\n          }\n          if (placeholderIndex > thisIndex &&\n              pageY > offsetTop + thisHeight - deadZone) {\n            return\n          }\n        }\n\n        if (dragging.oldDisplay === undefined) {\n          dragging.oldDisplay = dragging.style.display\n        }\n\n        if (dragging.style.display !== 'none') {\n          dragging.style.display = 'none'\n        }\n\n        if (placeholderIndex < thisIndex) {\n          _after(element, placeholder)\n        } else {\n          _before(element, placeholder)\n        }\n        // Intentionally violated chaining, it is more complex otherwise\n        placeholders\n          .filter(function (element) { return element !== placeholder })\n          .forEach(_detach)\n      } else {\n        if (placeholders.indexOf(element) === -1 &&\n            !_filter(_getChildren(element), options.items).length) {\n          placeholders.forEach(_detach)\n          element.appendChild(placeholder)\n        }\n      }\n    }, options.debounce)\n\n    // Handle dragover and dragenter events on draggable items\n    var onDragOverEnter = function (e) {\n      if (!dragging || !_listsConnected(sortableElement, dragging.parentElement) || _data(sortableElement, '_disabled') === 'true') {\n        return\n      }\n      if (maxItems && _filter(_getChildren(sortableElement), _data(sortableElement, 'items')).length >= maxItems) {\n        return\n      }\n      e.preventDefault()\n      e.stopPropagation()\n      e.dataTransfer.dropEffect = 'move'\n      debouncedDragOverEnter(this, e.pageY)\n    }\n\n    _on(items.concat(sortableElement), 'dragover', onDragOverEnter)\n    _on(items.concat(sortableElement), 'dragenter', onDragOverEnter)\n  })\n\n  return sortableElements\n}\n\nsortable.destroy = function (sortableElement) {\n  _destroySortable(sortableElement)\n}\n\nsortable.enable = function (sortableElement) {\n  _enableSortable(sortableElement)\n}\n\nsortable.disable = function (sortableElement) {\n  _disableSortable(sortableElement)\n}\n\n\nreturn sortable;\n}));\n"]}
\ No newline at end of file
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factory) {\n  if (typeof define === 'function' && define.amd) {\n    define([], factory);\n  } else if (typeof exports === 'object') {\n    module.exports = factory();\n  } else {\n    root.sortable = factory();\n  }\n}(this, function() {\n/*\n * HTML5 Sortable library\n * https://github.com/voidberg/html5sortable\n *\n * Original code copyright 2012 Ali Farhadi.\n * This version is mantained by Lukas Oppermann <lukas@vea.re>\n * Previously also mantained by Alexandru Badiu <andu@ctrlz.ro>\n * jQuery-independent implementation by Nazar Mokrynskyi <nazar@mokrynskyi.com>\n *\n * Released under the MIT license.\n */\n'use strict'\n/*\n * variables global to the plugin\n */\nvar dragging\nvar draggingHeight\nvar placeholders = []\nvar sortables = []\n/**\n * Get or set data on element\n * @param {Element} element\n * @param {string} key\n * @param {*} value\n * @return {*}\n */\nvar _data = function (element, key, value) {\n  if (value === undefined) {\n    return element && element.h5s && element.h5s.data && element.h5s.data[key]\n  } else {\n    element.h5s = element.h5s || {}\n    element.h5s.data = element.h5s.data || {}\n    element.h5s.data[key] = value\n  }\n}\n/**\n * Remove data from element\n * @param {Element} element\n */\nvar _removeData = function (element) {\n  if (element.h5s) {\n    delete element.h5s.data\n  }\n}\n/**\n * Tests if an element matches a given selector. Comparable to jQuery's $(el).is('.my-class')\n * @param {el} DOM element\n * @param {selector} selector test against the element\n * @returns {boolean}\n */\n/* istanbul ignore next */\nvar _matches = function (el, selector) {\n  return (el.matches || el.matchesSelector || el.msMatchesSelector || el.mozMatchesSelector || el.webkitMatchesSelector || el.oMatchesSelector).call(el, selector)\n}\n/**\n * Filter only wanted nodes\n * @param {Array|NodeList} nodes\n * @param {Array/string} wanted\n * @returns {Array}\n */\nvar _filter = function (nodes, wanted) {\n  if (!wanted) {\n    return Array.prototype.slice.call(nodes)\n  }\n  var result = []\n  for (var i = 0; i < nodes.length; ++i) {\n    if (typeof wanted === 'string' && _matches(nodes[i], wanted)) {\n      result.push(nodes[i])\n    }\n    if (wanted.indexOf(nodes[i]) !== -1) {\n      result.push(nodes[i])\n    }\n  }\n  return result\n}\n/**\n * @param {Array|Element} element\n * @param {Array|string} event\n * @param {Function} callback\n */\nvar _on = function (element, event, callback) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _on(element[i], event, callback)\n    }\n    return\n  }\n  element.addEventListener(event, callback)\n  element.h5s = element.h5s || {}\n  element.h5s.events = element.h5s.events || {}\n  element.h5s.events[event] = callback\n}\n/**\n * @param {Array|Element} element\n * @param {Array|string} event\n */\nvar _off = function (element, event) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _off(element[i], event)\n    }\n    return\n  }\n  if (element.h5s && element.h5s.events && element.h5s.events[event]) {\n    element.removeEventListener(event, element.h5s.events[event])\n    delete element.h5s.events[event]\n  }\n}\n/**\n * @param {Array|Element} element\n * @param {string} attribute\n * @param {*} value\n */\nvar _attr = function (element, attribute, value) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _attr(element[i], attribute, value)\n    }\n    return\n  }\n  element.setAttribute(attribute, value)\n}\n/**\n * @param {Array|Element} element\n * @param {string} attribute\n */\nvar _removeAttr = function (element, attribute) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _removeAttr(element[i], attribute)\n    }\n    return\n  }\n  element.removeAttribute(attribute)\n}\n/**\n * @param {Element} element\n * @returns {{left: *, top: *}}\n */\nvar _offset = function (element) {\n  var rect = element.getClientRects()[0]\n  return {\n    left: rect.left + window.scrollX,\n    top: rect.top + window.scrollY\n  }\n}\n/*\n * remove event handlers from items\n * @param {Array|NodeList} items\n */\nvar _removeItemEvents = function (items) {\n  _off(items, 'dragstart')\n  _off(items, 'dragend')\n  _off(items, 'selectstart')\n  _off(items, 'dragover')\n  _off(items, 'dragenter')\n  _off(items, 'drop')\n}\n/*\n * Remove event handlers from sortable\n * @param {Element} sortable a single sortable\n */\nvar _removeSortableEvents = function (sortable) {\n  _off(sortable, 'dragover')\n  _off(sortable, 'dragenter')\n  _off(sortable, 'drop')\n}\n/*\n * Attach ghost to dataTransfer object\n * @param {Event} original event\n * @param {object} ghost-object with item, x and y coordinates\n */\nvar _attachGhost = function (event, ghost) {\n  // this needs to be set for HTML5 drag & drop to work\n  event.dataTransfer.effectAllowed = 'move'\n  event.dataTransfer.setData('text', '')\n\n  // check if setDragImage method is available\n  if (event.dataTransfer.setDragImage) {\n    event.dataTransfer.setDragImage(ghost.draggedItem, ghost.x, ghost.y)\n  }\n}\n/**\n * _addGhostPos clones the dragged item and adds it as a Ghost item\n * @param {Event} event - the event fired when dragstart is triggered\n * @param {object} ghost - .draggedItem = Element\n */\nvar _addGhostPos = function (event, ghost) {\n  if (!ghost.x) {\n    ghost.x = parseInt(event.pageX - _offset(ghost.draggedItem).left)\n  }\n  if (!ghost.y) {\n    ghost.y = parseInt(event.pageY - _offset(ghost.draggedItem).top)\n  }\n  return ghost\n}\n/**\n * _makeGhost decides which way to make a ghost and passes it to attachGhost\n * @param {Element} draggedItem - the item that the user drags\n */\nvar _makeGhost = function (draggedItem) {\n  return {\n    draggedItem: draggedItem\n  }\n}\n/**\n * _getGhost constructs ghost and attaches it to dataTransfer\n * @param {Event} event - the original drag event object\n * @param {Element} draggedItem - the item that the user drags\n */\n// TODO: could draggedItem be replaced by event.target in all instances\nvar _getGhost = function (event, draggedItem) {\n  // add ghost item & draggedItem to ghost object\n  var ghost = _makeGhost(draggedItem)\n  // attach ghost position\n  ghost = _addGhostPos(event, ghost)\n  // attach ghost to dataTransfer\n  _attachGhost(event, ghost)\n}\n/*\n * Remove data from sortable\n * @param {Element} sortable a single sortable\n */\nvar _removeSortableData = function (sortable) {\n  _removeData(sortable)\n  _removeAttr(sortable, 'aria-dropeffect')\n}\n/*\n * Remove data from items\n * @param {Array|Element} items\n */\nvar _removeItemData = function (items) {\n  _removeAttr(items, 'aria-grabbed')\n  _removeAttr(items, 'draggable')\n  _removeAttr(items, 'role')\n}\n/*\n * Check if two lists are connected\n * @param {Element} curList\n * @param {Element} destList\n */\nvar _listsConnected = function (curList, destList) {\n  if (curList === destList) {\n    return true\n  }\n  if (_data(curList, 'connectWith') !== undefined) {\n    return _data(curList, 'connectWith') === _data(destList, 'connectWith')\n  }\n  return false\n}\n/*\n * get handle or return item\n * @param {Array} items\n * @param {selector} handle\n */\nvar _getHandles = function (items, handle) {\n  var result = []\n  var handles\n  if (!handle) {\n    return items\n  }\n  for (var i = 0; i < items.length; ++i) {\n    handles = items[i].querySelectorAll(handle)\n    result = result.concat(Array.prototype.slice.call(handles))\n  }\n  return result\n}\n/*\n * Destroy the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _destroySortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts') || {}\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  // remove event handlers & data from sortable\n  _removeSortableEvents(sortableElement)\n  _removeSortableData(sortableElement)\n  // remove event handlers & data from items\n  _off(handles, 'mousedown')\n  _removeItemEvents(items)\n  _removeItemData(items)\n}\n/*\n * Enable the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _enableSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _attr(sortableElement, 'aria-dropeffect', 'move')\n  _data(sortableElement, '_disabled', 'false')\n  _attr(handles, 'draggable', 'true')\n  // IE FIX for ghost\n  // can be disabled as it has the side effect that other events\n  // (e.g. click) will be ignored\n  var spanEl = (document || window.document).createElement('span')\n  if (typeof spanEl.dragDrop === 'function' && !opts.disableIEFix) {\n    _on(handles, 'mousedown', function () {\n      if (items.indexOf(this) !== -1) {\n        this.dragDrop()\n      } else {\n        var parent = this.parentElement\n        while (items.indexOf(parent) === -1) {\n          parent = parent.parentElement\n        }\n        parent.dragDrop()\n      }\n    })\n  }\n}\n/*\n * Disable the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _disableSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _attr(sortableElement, 'aria-dropeffect', 'none')\n  _data(sortableElement, '_disabled', 'true')\n  _attr(handles, 'draggable', 'false')\n  _off(handles, 'mousedown')\n}\n/*\n * Reload the sortable\n * @param {Element} sortableElement a single sortable\n * @description events need to be removed to not be double bound\n */\nvar _reloadSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _data(sortableElement, '_disabled', 'false')\n  // remove event handlers from items\n  _removeItemEvents(items)\n  _off(handles, 'mousedown')\n  // remove event handlers from sortable\n  _removeSortableEvents(sortableElement)\n}\n/**\n * Get position of the element relatively to its sibling elements\n * @param {Element} element\n * @returns {number}\n */\nvar _index = function (element) {\n  if (!element.parentElement) {\n    return 0\n  }\n  return Array.prototype.indexOf.call(element.parentElement.children, element)\n}\n/**\n * Whether element is in DOM\n * @param {Element} element\n * @returns {boolean}\n */\nvar _attached = function (element) {\n  // document.body.contains(element)\n  return !!element.parentNode\n}\n/**\n * Convert HTML string into DOM element.\n * @param {Element|string} html\n * @param {string} tagname\n * @returns {Element}\n */\nvar _html2element = function (html, tagName) {\n  if (typeof html !== 'string') {\n    return html\n  }\n  var parentElement = document.createElement(tagName)\n  parentElement.innerHTML = html\n  return parentElement.firstChild\n}\n/**\n * Insert before target\n * @param {Element} target\n * @param {Element} element\n */\nvar _before = function (target, element) {\n  target.parentElement.insertBefore(\n    element,\n    target\n  )\n}\n/**\n * Insert after target\n * @param {Element} target\n * @param {Element} element\n */\nvar _after = function (target, element) {\n  target.parentElement.insertBefore(\n    element,\n    target.nextElementSibling\n  )\n}\n/**\n * Detach element from DOM\n * @param {Element} element\n */\nvar _detach = function (element) {\n  if (element.parentNode) {\n    element.parentNode.removeChild(element)\n  }\n}\n/**\n * Make native event that can be dispatched afterwards\n * @param {string} name\n * @param {object} detail\n * @returns {CustomEvent}\n */\nvar _makeEvent = function (name, detail) {\n  var e = document.createEvent('Event')\n  if (detail) {\n    e.detail = detail\n  }\n  e.initEvent(name, false, true)\n  return e\n}\n/**\n * @param {Element} sortableElement\n * @param {CustomEvent} event\n */\nvar _dispatchEventOnConnected = function (sortableElement, event) {\n  sortables.forEach(function (target) {\n    if (_listsConnected(sortableElement, target)) {\n      target.dispatchEvent(event)\n    }\n  })\n}\n\n/**\n * Creates and returns a new debounced version of the passed function which will postpone its execution until after wait milliseconds have elapsed\n * @param {fn} Function to debounce\n * @param {delay} time to wait before calling function with latest arguments, 0 - no debounce\n * @param {context} time to wait before calling function with latest arguments, 0 - no debounce\n * @returns {function} - debounced function\n */\nfunction _debounce (fn, delay, context) {\n  var timer = null\n\n  if (delay === 0) {\n    return fn\n  }\n  return function () {\n    var eContext = context || this\n    var args = arguments\n    clearTimeout(timer)\n    timer = setTimeout(function () {\n      fn.apply(eContext, args)\n    }, delay)\n  }\n}\n\nvar _getChildren = function (element) {\n  return element.children\n}\n\nvar _serialize = function (list) {\n  var children = _filter(_getChildren(list), _data(list, 'items'))\n  return children\n}\n\n/*\n * Public sortable object\n * @param {Array|NodeList} sortableElements\n * @param {object|string} options|method\n */\nvar sortable = function (sortableElements, options) {\n  var method = String(options)\n\n  options = (function (options) {\n    var result = {\n      connectWith: false,\n      placeholder: null,\n      disableIEFix: false,\n      placeholderClass: 'sortable-placeholder',\n      draggingClass: 'sortable-dragging',\n      hoverClass: false,\n      debounce: 0,\n      maxItems: 0\n    }\n    for (var option in options) {\n      result[option] = options[option]\n    }\n    return result\n  })(options)\n\n  if (options && typeof options.getChildren === 'function') {\n    _getChildren = options.getChildren\n  }\n\n  if (typeof sortableElements === 'string') {\n    sortableElements = document.querySelectorAll(sortableElements)\n  }\n\n  if (sortableElements instanceof window.Element) {\n    sortableElements = [sortableElements]\n  }\n\n  sortableElements = Array.prototype.slice.call(sortableElements)\n\n  if (/serialize/.test(method)) {\n    var serialized = []\n    sortableElements.forEach(function (sortableElement) {\n      serialized.push({\n        list: sortableElement,\n        children: _serialize(sortableElement)\n      })\n    })\n    return serialized\n  }\n\n  /* TODO: maxstatements should be 25, fix and remove line below */\n  /* jshint maxstatements:false */\n  sortableElements.forEach(function (sortableElement) {\n    if (/enable|disable|destroy/.test(method)) {\n      return sortable[method](sortableElement)\n    }\n\n    // get options & set options on sortable\n    options = _data(sortableElement, 'opts') || options\n    _data(sortableElement, 'opts', options)\n    // reset sortable\n    _reloadSortable(sortableElement)\n    // initialize\n    var items = _filter(_getChildren(sortableElement), options.items)\n    var index\n    var startParent\n    var startList\n    var placeholder = options.placeholder\n    var maxItems\n    if (!placeholder) {\n      placeholder = document.createElement(\n        /^ul|ol$/i.test(sortableElement.tagName) ? 'li' : 'div'\n      )\n    }\n    placeholder = _html2element(placeholder, sortableElement.tagName)\n    placeholder.classList.add.apply(\n      placeholder.classList,\n      options.placeholderClass.split(' ')\n    )\n\n    // setup sortable ids\n    if (!sortableElement.getAttribute('data-sortable-id')) {\n      var id = sortables.length\n      sortables[id] = sortableElement\n      _attr(sortableElement, 'data-sortable-id', id)\n      _attr(items, 'data-item-sortable-id', id)\n    }\n\n    _data(sortableElement, 'items', options.items)\n    placeholders.push(placeholder)\n    if (options.connectWith) {\n      _data(sortableElement, 'connectWith', options.connectWith)\n    }\n\n    _enableSortable(sortableElement)\n    _attr(items, 'role', 'option')\n    _attr(items, 'aria-grabbed', 'false')\n\n    // Mouse over class\n    if (options.hoverClass) {\n      var hoverClass = 'sortable-over'\n      if (typeof options.hoverClass === 'string') {\n        hoverClass = options.hoverClass\n      }\n\n      _on(items, 'mouseenter', function () {\n        this.classList.add(hoverClass)\n      })\n      _on(items, 'mouseleave', function () {\n        this.classList.remove(hoverClass)\n      })\n    }\n\n    // max items\n    if (options.maxItems && typeof options.maxItems === 'number') {\n      maxItems = options.maxItems\n    }\n\n    // Handle drag events on draggable items\n    _on(items, 'dragstart', function (e) {\n      e.stopImmediatePropagation()\n      if ((options.handle && !_matches(e.target, options.handle)) || this.getAttribute('draggable') === 'false') {\n        return\n      }\n\n      // add transparent clone or other ghost to cursor\n      _getGhost(e, this)\n      // cache selsection & add attr for dragging\n      this.classList.add(options.draggingClass)\n      dragging = this\n      _attr(dragging, 'aria-grabbed', 'true')\n      // grab values\n      index = _index(dragging)\n      draggingHeight = parseInt(window.getComputedStyle(dragging).height)\n      startParent = this.parentElement\n      startList = _serialize(startParent)\n      // dispatch sortstart event on each element in group\n      _dispatchEventOnConnected(sortableElement, _makeEvent('sortstart', {\n        item: dragging,\n        placeholder: placeholder,\n        startparent: startParent\n      }))\n    })\n    // Handle drag events on draggable items\n    _on(items, 'dragend', function () {\n      var newParent\n      if (!dragging) {\n        return\n      }\n      // remove dragging attributes and show item\n      dragging.classList.remove(options.draggingClass)\n      _attr(dragging, 'aria-grabbed', 'false')\n      dragging.style.display = dragging.oldDisplay\n      delete dragging.oldDisplay\n\n      placeholders.forEach(_detach)\n      newParent = this.parentElement\n      _dispatchEventOnConnected(sortableElement, _makeEvent('sortstop', {\n        item: dragging,\n        startparent: startParent\n      }))\n      if (index !== _index(dragging) || startParent !== newParent) {\n        _dispatchEventOnConnected(sortableElement, _makeEvent('sortupdate', {\n          item: dragging,\n          index: _filter(_getChildren(newParent), _data(newParent, 'items'))\n              .indexOf(dragging),\n          oldindex: items.indexOf(dragging),\n          elementIndex: _index(dragging),\n          oldElementIndex: index,\n          startparent: startParent,\n          endparent: newParent,\n          newEndList: _serialize(newParent),\n          newStartList: _serialize(startParent),\n          oldStartList: startList\n        }))\n      }\n      dragging = null\n      draggingHeight = null\n    })\n    // Handle drop event on sortable & placeholder\n    // TODO: REMOVE placeholder?????\n    _on([sortableElement, placeholder], 'drop', function (e) {\n      var visiblePlaceholder\n      if (!_listsConnected(sortableElement, dragging.parentElement)) {\n        return\n      }\n\n      e.preventDefault()\n      e.stopPropagation()\n      visiblePlaceholder = placeholders.filter(_attached)[0]\n      _after(visiblePlaceholder, dragging)\n      dragging.dispatchEvent(_makeEvent('dragend'))\n    })\n\n    var debouncedDragOverEnter = _debounce(function (element, pageY) {\n      if (!dragging) {\n        return\n      }\n\n      if (items.indexOf(element) !== -1) {\n        var thisHeight = parseInt(window.getComputedStyle(element).height)\n        var placeholderIndex = _index(placeholder)\n        var thisIndex = _index(element)\n        if (options.forcePlaceholderSize) {\n          placeholder.style.height = draggingHeight + 'px'\n        }\n\n        // Check if `element` is bigger than the draggable. If it is, we have to define a dead zone to prevent flickering\n        if (thisHeight > draggingHeight) {\n          // Dead zone?\n          var deadZone = thisHeight - draggingHeight\n          var offsetTop = _offset(element).top\n          if (placeholderIndex < thisIndex &&\n              pageY < offsetTop + deadZone) {\n            return\n          }\n          if (placeholderIndex > thisIndex &&\n              pageY > offsetTop + thisHeight - deadZone) {\n            return\n          }\n        }\n\n        if (dragging.oldDisplay === undefined) {\n          dragging.oldDisplay = dragging.style.display\n        }\n\n        if (dragging.style.display !== 'none') {\n          dragging.style.display = 'none'\n        }\n\n        if (placeholderIndex < thisIndex) {\n          _after(element, placeholder)\n        } else {\n          _before(element, placeholder)\n        }\n        // Intentionally violated chaining, it is more complex otherwise\n        placeholders\n          .filter(function (element) { return element !== placeholder })\n          .forEach(_detach)\n      } else {\n        if (placeholders.indexOf(element) === -1 &&\n            !_filter(_getChildren(element), options.items).length) {\n          placeholders.forEach(_detach)\n          element.appendChild(placeholder)\n        }\n      }\n    }, options.debounce)\n\n    // Handle dragover and dragenter events on draggable items\n    var onDragOverEnter = function (e) {\n      if (!dragging || !_listsConnected(sortableElement, dragging.parentElement) || _data(sortableElement, '_disabled') === 'true') {\n        return\n      }\n      if (maxItems && _filter(_getChildren(sortableElement), _data(sortableElement, 'items')).length >= maxItems) {\n        return\n      }\n      e.preventDefault()\n      e.stopPropagation()\n      e.dataTransfer.dropEffect = 'move'\n      debouncedDragOverEnter(this, e.pageY)\n    }\n\n    _on(items.concat(sortableElement), 'dragover', onDragOverEnter)\n    _on(items.concat(sortableElement), 'dragenter', onDragOverEnter)\n  })\n\n  return sortableElements\n}\n\nsortable.destroy = function (sortableElement) {\n  _destroySortable(sortableElement)\n}\n\nsortable.enable = function (sortableElement) {\n  _enableSortable(sortableElement)\n}\n\nsortable.disable = function (sortableElement) {\n  _disableSortable(sortableElement)\n}\n\n\nreturn sortable;\n}));\n"]}
\ No newline at end of file
diff --git a/docs/html.sortable.min.js b/docs/html.sortable.min.js
index 2aa8597d..89e98925 100644
--- a/docs/html.sortable.min.js
+++ b/docs/html.sortable.min.js
@@ -1,2 +1,2 @@
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diff --git a/docs/html.sortable.min.js.map b/docs/html.sortable.min.js.map
index 0e3c4f12..6a7d070a 100644
--- a/docs/html.sortable.min.js.map
+++ b/docs/html.sortable.min.js.map
@@ -1 +1 @@
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element.h5s.data && element.h5s.data[key]\n  } else {\n    element.h5s = element.h5s || {}\n    element.h5s.data = element.h5s.data || {}\n    element.h5s.data[key] = value\n  }\n}\n/**\n * Remove data from element\n * @param {Element} element\n */\nvar _removeData = function (element) {\n  if (element.h5s) {\n    delete element.h5s.data\n  }\n}\n/**\n * Tests if an element matches a given selector. Comparable to jQuery's $(el).is('.my-class')\n * @param {el} DOM element\n * @param {selector} selector test against the element\n * @returns {boolean}\n */\n/* istanbul ignore next */\nvar _matches = function (el, selector) {\n  return (el.matches || el.matchesSelector || el.msMatchesSelector || el.mozMatchesSelector || el.webkitMatchesSelector || el.oMatchesSelector).call(el, selector)\n}\n/**\n * Filter only wanted nodes\n * @param {Array|NodeList} nodes\n * @param {Array/string} wanted\n * @returns {Array}\n */\nvar _filter = function (nodes, wanted) {\n  if (!wanted) {\n    return Array.prototype.slice.call(nodes)\n  }\n  var result = []\n  for (var i = 0; i < nodes.length; ++i) {\n    if (typeof wanted === 'string' && _matches(nodes[i], wanted)) {\n      result.push(nodes[i])\n    }\n    if (wanted.indexOf(nodes[i]) !== -1) {\n      result.push(nodes[i])\n    }\n  }\n  return result\n}\n/**\n * @param {Array|Element} element\n * @param {Array|string} event\n * @param {Function} callback\n */\nvar _on = function (element, event, callback) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _on(element[i], event, callback)\n    }\n    return\n  }\n  element.addEventListener(event, callback)\n  element.h5s = element.h5s || {}\n  element.h5s.events = element.h5s.events || {}\n  element.h5s.events[event] = callback\n}\n/**\n * @param {Array|Element} element\n * @param {Array|string} event\n */\nvar _off = function (element, event) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _off(element[i], event)\n    }\n    return\n  }\n  if (element.h5s && element.h5s.events && element.h5s.events[event]) {\n    element.removeEventListener(event, element.h5s.events[event])\n    delete element.h5s.events[event]\n  }\n}\n/**\n * @param {Array|Element} element\n * @param {string} attribute\n * @param {*} value\n */\nvar _attr = function (element, attribute, value) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _attr(element[i], attribute, value)\n    }\n    return\n  }\n  element.setAttribute(attribute, value)\n}\n/**\n * @param {Array|Element} element\n * @param {string} attribute\n */\nvar _removeAttr = function (element, attribute) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _removeAttr(element[i], attribute)\n    }\n    return\n  }\n  element.removeAttribute(attribute)\n}\n/**\n * @param {Element} element\n * @returns {{left: *, top: *}}\n */\nvar _offset = function (element) {\n  var rect = element.getClientRects()[0]\n  return {\n    left: rect.left + window.scrollX,\n    top: rect.top + window.scrollY\n  }\n}\n/*\n * remove event handlers from items\n * @param {Array|NodeList} items\n */\nvar _removeItemEvents = function (items) {\n  _off(items, 'dragstart')\n  _off(items, 'dragend')\n  _off(items, 'selectstart')\n  _off(items, 'dragover')\n  _off(items, 'dragenter')\n  _off(items, 'drop')\n}\n/*\n * Remove event handlers from sortable\n * @param {Element} sortable a single sortable\n */\nvar _removeSortableEvents = function (sortable) {\n  _off(sortable, 'dragover')\n  _off(sortable, 'dragenter')\n  _off(sortable, 'drop')\n}\n/*\n * Attach ghost to dataTransfer object\n * @param {Event} original event\n * @param {object} ghost-object with item, x and y coordinates\n */\nvar _attachGhost = function (event, ghost) {\n  // this needs to be set for HTML5 drag & drop to work\n  event.dataTransfer.effectAllowed = 'move'\n  event.dataTransfer.setData('text', '')\n\n  // check if setDragImage method is available\n  if (event.dataTransfer.setDragImage) {\n    event.dataTransfer.setDragImage(ghost.draggedItem, ghost.x, ghost.y)\n  }\n}\n/**\n * _addGhostPos clones the dragged item and adds it as a Ghost item\n * @param {Event} event - the event fired when dragstart is triggered\n * @param {object} ghost - .draggedItem = Element\n */\nvar _addGhostPos = function (event, ghost) {\n  if (!ghost.x) {\n    ghost.x = parseInt(event.pageX - _offset(ghost.draggedItem).left)\n  }\n  if (!ghost.y) {\n    ghost.y = parseInt(event.pageY - _offset(ghost.draggedItem).top)\n  }\n  return ghost\n}\n/**\n * _makeGhost decides which way to make a ghost and passes it to attachGhost\n * @param {Element} draggedItem - the item that the user drags\n */\nvar _makeGhost = function (draggedItem) {\n  return {\n    draggedItem: draggedItem\n  }\n}\n/**\n * _getGhost constructs ghost and attaches it to dataTransfer\n * @param {Event} event - the original drag event object\n * @param {Element} draggedItem - the item that the user drags\n */\n// TODO: could draggedItem be replaced by event.target in all instances\nvar _getGhost = function (event, draggedItem) {\n  // add ghost item & draggedItem to ghost object\n  var ghost = _makeGhost(draggedItem)\n  // attach ghost position\n  ghost = _addGhostPos(event, ghost)\n  // attach ghost to dataTransfer\n  _attachGhost(event, ghost)\n}\n/*\n * Remove data from sortable\n * @param {Element} sortable a single sortable\n */\nvar _removeSortableData = function (sortable) {\n  _removeData(sortable)\n  _removeAttr(sortable, 'aria-dropeffect')\n}\n/*\n * Remove data from items\n * @param {Array|Element} items\n */\nvar _removeItemData = function (items) {\n  _removeAttr(items, 'aria-grabbed')\n  _removeAttr(items, 'draggable')\n  _removeAttr(items, 'role')\n}\n/*\n * Check if two lists are connected\n * @param {Element} curList\n * @param {Element} destList\n */\nvar _listsConnected = function (curList, destList) {\n  if (curList === destList) {\n    return true\n  }\n  if (_data(curList, 'connectWith') !== undefined) {\n    return _data(curList, 'connectWith') === _data(destList, 'connectWith')\n  }\n  return false\n}\n/*\n * get handle or return item\n * @param {Array} items\n * @param {selector} handle\n */\nvar _getHandles = function (items, handle) {\n  var result = []\n  var handles\n  if (!handle) {\n    return items\n  }\n  for (var i = 0; i < items.length; ++i) {\n    handles = items[i].querySelectorAll(handle)\n    result = result.concat(Array.prototype.slice.call(handles))\n  }\n  return result\n}\n/*\n * Destroy the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _destroySortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts') || {}\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  // remove event handlers & data from sortable\n  _removeSortableEvents(sortableElement)\n  _removeSortableData(sortableElement)\n  // remove event handlers & data from items\n  _off(handles, 'mousedown')\n  _removeItemEvents(items)\n  _removeItemData(items)\n}\n/*\n * Enable the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _enableSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _attr(sortableElement, 'aria-dropeffect', 'move')\n  _data(sortableElement, '_disabled', 'false')\n  _attr(handles, 'draggable', 'true')\n  // IE FIX for ghost\n  // can be disabled as it has the side effect that other events\n  // (e.g. click) will be ignored\n  var spanEl = (document || window.document).createElement('span')\n  if (typeof spanEl.dragDrop === 'function' && !opts.disableIEFix) {\n    _on(handles, 'mousedown', function () {\n      if (items.indexOf(this) !== -1) {\n        this.dragDrop()\n      } else {\n        var parent = this.parentElement\n        while (items.indexOf(parent) === -1) {\n          parent = parent.parentElement\n        }\n        parent.dragDrop()\n      }\n    })\n  }\n}\n/*\n * Disable the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _disableSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _attr(sortableElement, 'aria-dropeffect', 'none')\n  _data(sortableElement, '_disabled', 'true')\n  _attr(handles, 'draggable', 'false')\n  _off(handles, 'mousedown')\n}\n/*\n * Reload the sortable\n * @param {Element} sortableElement a single sortable\n * @description events need to be removed to not be double bound\n */\nvar _reloadSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _data(sortableElement, '_disabled', 'false')\n  // remove event handlers from items\n  _removeItemEvents(items)\n  _off(handles, 'mousedown')\n  // remove event handlers from sortable\n  _removeSortableEvents(sortableElement)\n}\n/**\n * Get position of the element relatively to its sibling elements\n * @param {Element} element\n * @returns {number}\n */\nvar _index = function (element) {\n  if (!element.parentElement) {\n    return 0\n  }\n  return Array.prototype.indexOf.call(element.parentElement.children, element)\n}\n/**\n * Whether element is in DOM\n * @param {Element} element\n * @returns {boolean}\n */\nvar _attached = function (element) {\n  // document.body.contains(element)\n  return !!element.parentNode\n}\n/**\n * Convert HTML string into DOM element.\n * @param {Element|string} html\n * @param {string} tagname\n * @returns {Element}\n */\nvar _html2element = function (html, tagName) {\n  if (typeof html !== 'string') {\n    return html\n  }\n  var parentElement = document.createElement(tagName)\n  parentElement.innerHTML = html\n  return parentElement.firstChild\n}\n/**\n * Insert before target\n * @param {Element} target\n * @param {Element} element\n */\nvar _before = function (target, element) {\n  target.parentElement.insertBefore(\n    element,\n    target\n  )\n}\n/**\n * Insert after target\n * @param {Element} target\n * @param {Element} element\n */\nvar _after = function (target, element) {\n  target.parentElement.insertBefore(\n    element,\n    target.nextElementSibling\n  )\n}\n/**\n * Detach element from DOM\n * @param {Element} element\n */\nvar _detach = function (element) {\n  if (element.parentNode) {\n    element.parentNode.removeChild(element)\n  }\n}\n/**\n * Make native event that can be dispatched afterwards\n * @param {string} name\n * @param {object} detail\n * @returns {CustomEvent}\n */\nvar _makeEvent = function (name, detail) {\n  var e = document.createEvent('Event')\n  if (detail) {\n    e.detail = detail\n  }\n  e.initEvent(name, false, true)\n  return e\n}\n/**\n * @param {Element} sortableElement\n * @param {CustomEvent} event\n */\nvar _dispatchEventOnConnected = function (sortableElement, event) {\n  sortables.forEach(function (target) {\n    if (_listsConnected(sortableElement, target)) {\n      target.dispatchEvent(event)\n    }\n  })\n}\n\n/**\n * Creates and returns a new debounced version of the passed function which will postpone its execution until after wait milliseconds have elapsed\n * @param {fn} Function to debounce\n * @param {delay} time to wait before calling function with latest arguments, 0 - no debounce\n * @param {context} time to wait before calling function with latest arguments, 0 - no debounce\n * @returns {function} - debounced function\n */\nfunction _debounce (fn, delay, context) {\n  var timer = null\n\n  if (delay === 0) {\n    return fn\n  }\n  return function () {\n    var eContext = context || this\n    var args = arguments\n    clearTimeout(timer)\n    timer = setTimeout(function () {\n      fn.apply(eContext, args)\n    }, delay)\n  }\n}\n\nvar _getChildren = function (element) {\n  return element.children\n}\n\nvar _serialize = function (list) {\n  var children = _filter(_getChildren(list), _data(list, 'items'))\n  return children\n}\n\n/*\n * Public sortable object\n * @param {Array|NodeList} sortableElements\n * @param {object|string} options|method\n */\nvar sortable = function (sortableElements, options) {\n  var method = String(options)\n\n  options = (function (options) {\n    var result = {\n      connectWith: false,\n      placeholder: null,\n      disableIEFix: false,\n      placeholderClass: 'sortable-placeholder',\n      draggingClass: 'sortable-dragging',\n      hoverClass: false,\n      debounce: 0,\n      maxItems: 0\n    }\n    for (var option in options) {\n      result[option] = options[option]\n    }\n    return result\n  })(options)\n\n  if (options && typeof options.getChildren === 'function') {\n    _getChildren = options.getChildren\n  }\n\n  if (typeof sortableElements === 'string') {\n    sortableElements = document.querySelectorAll(sortableElements)\n  }\n\n  if (sortableElements instanceof window.Element) {\n    sortableElements = [sortableElements]\n  }\n\n  sortableElements = Array.prototype.slice.call(sortableElements)\n\n  /* TODO: maxstatements should be 25, fix and remove line below */\n  /* jshint maxstatements:false */\n  sortableElements.forEach(function (sortableElement) {\n    if (/enable|disable|destroy/.test(method)) {\n      sortable[method](sortableElement)\n      return\n    }\n\n    // get options & set options on sortable\n    options = _data(sortableElement, 'opts') || options\n    _data(sortableElement, 'opts', options)\n    // reset sortable\n    _reloadSortable(sortableElement)\n    // initialize\n    var items = _filter(_getChildren(sortableElement), options.items)\n    var index\n    var startParent\n    var startList\n    var placeholder = options.placeholder\n    var maxItems\n    if (!placeholder) {\n      placeholder = document.createElement(\n        /^ul|ol$/i.test(sortableElement.tagName) ? 'li' : 'div'\n      )\n    }\n    placeholder = _html2element(placeholder, sortableElement.tagName)\n    placeholder.classList.add.apply(\n      placeholder.classList,\n      options.placeholderClass.split(' ')\n    )\n\n    // setup sortable ids\n    if (!sortableElement.getAttribute('data-sortable-id')) {\n      var id = sortables.length\n      sortables[id] = sortableElement\n      _attr(sortableElement, 'data-sortable-id', id)\n      _attr(items, 'data-item-sortable-id', id)\n    }\n\n    _data(sortableElement, 'items', options.items)\n    placeholders.push(placeholder)\n    if (options.connectWith) {\n      _data(sortableElement, 'connectWith', options.connectWith)\n    }\n\n    _enableSortable(sortableElement)\n    _attr(items, 'role', 'option')\n    _attr(items, 'aria-grabbed', 'false')\n\n    // Mouse over class\n    if (options.hoverClass) {\n      var hoverClass = 'sortable-over'\n      if (typeof options.hoverClass === 'string') {\n        hoverClass = options.hoverClass\n      }\n\n      _on(items, 'mouseenter', function () {\n        this.classList.add(hoverClass)\n      })\n      _on(items, 'mouseleave', function () {\n        this.classList.remove(hoverClass)\n      })\n    }\n\n    // max items\n    if (options.maxItems && typeof options.maxItems === 'number') {\n      maxItems = options.maxItems\n    }\n\n    // Handle drag events on draggable items\n    _on(items, 'dragstart', function (e) {\n      e.stopImmediatePropagation()\n      if ((options.handle && !_matches(e.target, options.handle)) || this.getAttribute('draggable') === 'false') {\n        return\n      }\n\n      // add transparent clone or other ghost to cursor\n      _getGhost(e, this)\n      // cache selsection & add attr for dragging\n      this.classList.add(options.draggingClass)\n      dragging = this\n      _attr(dragging, 'aria-grabbed', 'true')\n      // grab values\n      index = _index(dragging)\n      draggingHeight = parseInt(window.getComputedStyle(dragging).height)\n      startParent = this.parentElement\n      startList = _serialize(startParent)\n      // dispatch sortstart event on each element in group\n      _dispatchEventOnConnected(sortableElement, _makeEvent('sortstart', {\n        item: dragging,\n        placeholder: placeholder,\n        startparent: startParent\n      }))\n    })\n    // Handle drag events on draggable items\n    _on(items, 'dragend', function () {\n      var newParent\n      if (!dragging) {\n        return\n      }\n      // remove dragging attributes and show item\n      dragging.classList.remove(options.draggingClass)\n      _attr(dragging, 'aria-grabbed', 'false')\n      dragging.style.display = dragging.oldDisplay\n      delete dragging.oldDisplay\n\n      placeholders.forEach(_detach)\n      newParent = this.parentElement\n      _dispatchEventOnConnected(sortableElement, _makeEvent('sortstop', {\n        item: dragging,\n        startparent: startParent\n      }))\n      if (index !== _index(dragging) || startParent !== newParent) {\n        _dispatchEventOnConnected(sortableElement, _makeEvent('sortupdate', {\n          item: dragging,\n          index: _filter(_getChildren(newParent), _data(newParent, 'items'))\n              .indexOf(dragging),\n          oldindex: items.indexOf(dragging),\n          elementIndex: _index(dragging),\n          oldElementIndex: index,\n          startparent: startParent,\n          endparent: newParent,\n          newEndList: _serialize(newParent),\n          newStartList: _serialize(startParent),\n          oldStartList: startList\n        }))\n      }\n      dragging = null\n      draggingHeight = null\n    })\n    // Handle drop event on sortable & placeholder\n    // TODO: REMOVE placeholder?????\n    _on([sortableElement, placeholder], 'drop', function (e) {\n      var visiblePlaceholder\n      if (!_listsConnected(sortableElement, dragging.parentElement)) {\n        return\n      }\n\n      e.preventDefault()\n      e.stopPropagation()\n      visiblePlaceholder = placeholders.filter(_attached)[0]\n      _after(visiblePlaceholder, dragging)\n      dragging.dispatchEvent(_makeEvent('dragend'))\n    })\n\n    var debouncedDragOverEnter = _debounce(function (element, pageY) {\n      if (!dragging) {\n        return\n      }\n\n      if (items.indexOf(element) !== -1) {\n        var thisHeight = parseInt(window.getComputedStyle(element).height)\n        var placeholderIndex = _index(placeholder)\n        var thisIndex = _index(element)\n        if (options.forcePlaceholderSize) {\n          placeholder.style.height = draggingHeight + 'px'\n        }\n\n        // Check if `element` is bigger than the draggable. If it is, we have to define a dead zone to prevent flickering\n        if (thisHeight > draggingHeight) {\n          // Dead zone?\n          var deadZone = thisHeight - draggingHeight\n          var offsetTop = _offset(element).top\n          if (placeholderIndex < thisIndex &&\n              pageY < offsetTop + deadZone) {\n            return\n          }\n          if (placeholderIndex > thisIndex &&\n              pageY > offsetTop + thisHeight - deadZone) {\n            return\n          }\n        }\n\n        if (dragging.oldDisplay === undefined) {\n          dragging.oldDisplay = dragging.style.display\n        }\n\n        if (dragging.style.display !== 'none') {\n          dragging.style.display = 'none'\n        }\n\n        if (placeholderIndex < thisIndex) {\n          _after(element, placeholder)\n        } else {\n          _before(element, placeholder)\n        }\n        // Intentionally violated chaining, it is more complex otherwise\n        placeholders\n          .filter(function (element) { return element !== placeholder })\n          .forEach(_detach)\n      } else {\n        if (placeholders.indexOf(element) === -1 &&\n            !_filter(_getChildren(element), options.items).length) {\n          placeholders.forEach(_detach)\n          element.appendChild(placeholder)\n        }\n      }\n    }, options.debounce)\n\n    // Handle dragover and dragenter events on draggable items\n    var onDragOverEnter = function (e) {\n      if (!dragging || !_listsConnected(sortableElement, dragging.parentElement) || _data(sortableElement, '_disabled') === 'true') {\n        return\n      }\n      if (maxItems && _filter(_getChildren(sortableElement), _data(sortableElement, 'items')).length >= maxItems) {\n        return\n      }\n      e.preventDefault()\n      e.stopPropagation()\n      e.dataTransfer.dropEffect = 'move'\n      debouncedDragOverEnter(this, e.pageY)\n    }\n\n    _on(items.concat(sortableElement), 'dragover', onDragOverEnter)\n    _on(items.concat(sortableElement), 'dragenter', onDragOverEnter)\n  })\n\n  return sortableElements\n}\n\nsortable.destroy = function (sortableElement) {\n  _destroySortable(sortableElement)\n}\n\nsortable.enable = function (sortableElement) {\n  _enableSortable(sortableElement)\n}\n\nsortable.disable = function (sortableElement) {\n  _disableSortable(sortableElement)\n}\n\n\nreturn sortable;\n}));\n"]}
\ No newline at end of file
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factory) {\n  if (typeof define === 'function' && define.amd) {\n    define([], factory);\n  } else if (typeof exports === 'object') {\n    module.exports = factory();\n  } else {\n    root.sortable = factory();\n  }\n}(this, function() {\n/*\n * HTML5 Sortable library\n * https://github.com/voidberg/html5sortable\n *\n * Original code copyright 2012 Ali Farhadi.\n * This version is mantained by Lukas Oppermann <lukas@vea.re>\n * Previously also mantained by Alexandru Badiu <andu@ctrlz.ro>\n * jQuery-independent implementation by Nazar Mokrynskyi <nazar@mokrynskyi.com>\n *\n * Released under the MIT license.\n */\n'use strict'\n/*\n * variables global to the plugin\n */\nvar dragging\nvar draggingHeight\nvar placeholders = []\nvar sortables = []\n/**\n * Get or set data on element\n * @param {Element} element\n * @param {string} key\n * @param {*} value\n * @return {*}\n */\nvar _data = function (element, key, value) {\n  if (value === undefined) {\n    return element && element.h5s && element.h5s.data && element.h5s.data[key]\n  } else {\n    element.h5s = element.h5s || {}\n    element.h5s.data = element.h5s.data || {}\n    element.h5s.data[key] = value\n  }\n}\n/**\n * Remove data from element\n * @param {Element} element\n */\nvar _removeData = function (element) {\n  if (element.h5s) {\n    delete element.h5s.data\n  }\n}\n/**\n * Tests if an element matches a given selector. Comparable to jQuery's $(el).is('.my-class')\n * @param {el} DOM element\n * @param {selector} selector test against the element\n * @returns {boolean}\n */\n/* istanbul ignore next */\nvar _matches = function (el, selector) {\n  return (el.matches || el.matchesSelector || el.msMatchesSelector || el.mozMatchesSelector || el.webkitMatchesSelector || el.oMatchesSelector).call(el, selector)\n}\n/**\n * Filter only wanted nodes\n * @param {Array|NodeList} nodes\n * @param {Array/string} wanted\n * @returns {Array}\n */\nvar _filter = function (nodes, wanted) {\n  if (!wanted) {\n    return Array.prototype.slice.call(nodes)\n  }\n  var result = []\n  for (var i = 0; i < nodes.length; ++i) {\n    if (typeof wanted === 'string' && _matches(nodes[i], wanted)) {\n      result.push(nodes[i])\n    }\n    if (wanted.indexOf(nodes[i]) !== -1) {\n      result.push(nodes[i])\n    }\n  }\n  return result\n}\n/**\n * @param {Array|Element} element\n * @param {Array|string} event\n * @param {Function} callback\n */\nvar _on = function (element, event, callback) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _on(element[i], event, callback)\n    }\n    return\n  }\n  element.addEventListener(event, callback)\n  element.h5s = element.h5s || {}\n  element.h5s.events = element.h5s.events || {}\n  element.h5s.events[event] = callback\n}\n/**\n * @param {Array|Element} element\n * @param {Array|string} event\n */\nvar _off = function (element, event) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _off(element[i], event)\n    }\n    return\n  }\n  if (element.h5s && element.h5s.events && element.h5s.events[event]) {\n    element.removeEventListener(event, element.h5s.events[event])\n    delete element.h5s.events[event]\n  }\n}\n/**\n * @param {Array|Element} element\n * @param {string} attribute\n * @param {*} value\n */\nvar _attr = function (element, attribute, value) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _attr(element[i], attribute, value)\n    }\n    return\n  }\n  element.setAttribute(attribute, value)\n}\n/**\n * @param {Array|Element} element\n * @param {string} attribute\n */\nvar _removeAttr = function (element, attribute) {\n  if (element instanceof Array) {\n    for (var i = 0; i < element.length; ++i) {\n      _removeAttr(element[i], attribute)\n    }\n    return\n  }\n  element.removeAttribute(attribute)\n}\n/**\n * @param {Element} element\n * @returns {{left: *, top: *}}\n */\nvar _offset = function (element) {\n  var rect = element.getClientRects()[0]\n  return {\n    left: rect.left + window.scrollX,\n    top: rect.top + window.scrollY\n  }\n}\n/*\n * remove event handlers from items\n * @param {Array|NodeList} items\n */\nvar _removeItemEvents = function (items) {\n  _off(items, 'dragstart')\n  _off(items, 'dragend')\n  _off(items, 'selectstart')\n  _off(items, 'dragover')\n  _off(items, 'dragenter')\n  _off(items, 'drop')\n}\n/*\n * Remove event handlers from sortable\n * @param {Element} sortable a single sortable\n */\nvar _removeSortableEvents = function (sortable) {\n  _off(sortable, 'dragover')\n  _off(sortable, 'dragenter')\n  _off(sortable, 'drop')\n}\n/*\n * Attach ghost to dataTransfer object\n * @param {Event} original event\n * @param {object} ghost-object with item, x and y coordinates\n */\nvar _attachGhost = function (event, ghost) {\n  // this needs to be set for HTML5 drag & drop to work\n  event.dataTransfer.effectAllowed = 'move'\n  event.dataTransfer.setData('text', '')\n\n  // check if setDragImage method is available\n  if (event.dataTransfer.setDragImage) {\n    event.dataTransfer.setDragImage(ghost.draggedItem, ghost.x, ghost.y)\n  }\n}\n/**\n * _addGhostPos clones the dragged item and adds it as a Ghost item\n * @param {Event} event - the event fired when dragstart is triggered\n * @param {object} ghost - .draggedItem = Element\n */\nvar _addGhostPos = function (event, ghost) {\n  if (!ghost.x) {\n    ghost.x = parseInt(event.pageX - _offset(ghost.draggedItem).left)\n  }\n  if (!ghost.y) {\n    ghost.y = parseInt(event.pageY - _offset(ghost.draggedItem).top)\n  }\n  return ghost\n}\n/**\n * _makeGhost decides which way to make a ghost and passes it to attachGhost\n * @param {Element} draggedItem - the item that the user drags\n */\nvar _makeGhost = function (draggedItem) {\n  return {\n    draggedItem: draggedItem\n  }\n}\n/**\n * _getGhost constructs ghost and attaches it to dataTransfer\n * @param {Event} event - the original drag event object\n * @param {Element} draggedItem - the item that the user drags\n */\n// TODO: could draggedItem be replaced by event.target in all instances\nvar _getGhost = function (event, draggedItem) {\n  // add ghost item & draggedItem to ghost object\n  var ghost = _makeGhost(draggedItem)\n  // attach ghost position\n  ghost = _addGhostPos(event, ghost)\n  // attach ghost to dataTransfer\n  _attachGhost(event, ghost)\n}\n/*\n * Remove data from sortable\n * @param {Element} sortable a single sortable\n */\nvar _removeSortableData = function (sortable) {\n  _removeData(sortable)\n  _removeAttr(sortable, 'aria-dropeffect')\n}\n/*\n * Remove data from items\n * @param {Array|Element} items\n */\nvar _removeItemData = function (items) {\n  _removeAttr(items, 'aria-grabbed')\n  _removeAttr(items, 'draggable')\n  _removeAttr(items, 'role')\n}\n/*\n * Check if two lists are connected\n * @param {Element} curList\n * @param {Element} destList\n */\nvar _listsConnected = function (curList, destList) {\n  if (curList === destList) {\n    return true\n  }\n  if (_data(curList, 'connectWith') !== undefined) {\n    return _data(curList, 'connectWith') === _data(destList, 'connectWith')\n  }\n  return false\n}\n/*\n * get handle or return item\n * @param {Array} items\n * @param {selector} handle\n */\nvar _getHandles = function (items, handle) {\n  var result = []\n  var handles\n  if (!handle) {\n    return items\n  }\n  for (var i = 0; i < items.length; ++i) {\n    handles = items[i].querySelectorAll(handle)\n    result = result.concat(Array.prototype.slice.call(handles))\n  }\n  return result\n}\n/*\n * Destroy the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _destroySortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts') || {}\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  // remove event handlers & data from sortable\n  _removeSortableEvents(sortableElement)\n  _removeSortableData(sortableElement)\n  // remove event handlers & data from items\n  _off(handles, 'mousedown')\n  _removeItemEvents(items)\n  _removeItemData(items)\n}\n/*\n * Enable the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _enableSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _attr(sortableElement, 'aria-dropeffect', 'move')\n  _data(sortableElement, '_disabled', 'false')\n  _attr(handles, 'draggable', 'true')\n  // IE FIX for ghost\n  // can be disabled as it has the side effect that other events\n  // (e.g. click) will be ignored\n  var spanEl = (document || window.document).createElement('span')\n  if (typeof spanEl.dragDrop === 'function' && !opts.disableIEFix) {\n    _on(handles, 'mousedown', function () {\n      if (items.indexOf(this) !== -1) {\n        this.dragDrop()\n      } else {\n        var parent = this.parentElement\n        while (items.indexOf(parent) === -1) {\n          parent = parent.parentElement\n        }\n        parent.dragDrop()\n      }\n    })\n  }\n}\n/*\n * Disable the sortable\n * @param {Element} sortableElement a single sortable\n */\nvar _disableSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _attr(sortableElement, 'aria-dropeffect', 'none')\n  _data(sortableElement, '_disabled', 'true')\n  _attr(handles, 'draggable', 'false')\n  _off(handles, 'mousedown')\n}\n/*\n * Reload the sortable\n * @param {Element} sortableElement a single sortable\n * @description events need to be removed to not be double bound\n */\nvar _reloadSortable = function (sortableElement) {\n  var opts = _data(sortableElement, 'opts')\n  var items = _filter(_getChildren(sortableElement), opts.items)\n  var handles = _getHandles(items, opts.handle)\n  _data(sortableElement, '_disabled', 'false')\n  // remove event handlers from items\n  _removeItemEvents(items)\n  _off(handles, 'mousedown')\n  // remove event handlers from sortable\n  _removeSortableEvents(sortableElement)\n}\n/**\n * Get position of the element relatively to its sibling elements\n * @param {Element} element\n * @returns {number}\n */\nvar _index = function (element) {\n  if (!element.parentElement) {\n    return 0\n  }\n  return Array.prototype.indexOf.call(element.parentElement.children, element)\n}\n/**\n * Whether element is in DOM\n * @param {Element} element\n * @returns {boolean}\n */\nvar _attached = function (element) {\n  // document.body.contains(element)\n  return !!element.parentNode\n}\n/**\n * Convert HTML string into DOM element.\n * @param {Element|string} html\n * @param {string} tagname\n * @returns {Element}\n */\nvar _html2element = function (html, tagName) {\n  if (typeof html !== 'string') {\n    return html\n  }\n  var parentElement = document.createElement(tagName)\n  parentElement.innerHTML = html\n  return parentElement.firstChild\n}\n/**\n * Insert before target\n * @param {Element} target\n * @param {Element} element\n */\nvar _before = function (target, element) {\n  target.parentElement.insertBefore(\n    element,\n    target\n  )\n}\n/**\n * Insert after target\n * @param {Element} target\n * @param {Element} element\n */\nvar _after = function (target, element) {\n  target.parentElement.insertBefore(\n    element,\n    target.nextElementSibling\n  )\n}\n/**\n * Detach element from DOM\n * @param {Element} element\n */\nvar _detach = function (element) {\n  if (element.parentNode) {\n    element.parentNode.removeChild(element)\n  }\n}\n/**\n * Make native event that can be dispatched afterwards\n * @param {string} name\n * @param {object} detail\n * @returns {CustomEvent}\n */\nvar _makeEvent = function (name, detail) {\n  var e = document.createEvent('Event')\n  if (detail) {\n    e.detail = detail\n  }\n  e.initEvent(name, false, true)\n  return e\n}\n/**\n * @param {Element} sortableElement\n * @param {CustomEvent} event\n */\nvar _dispatchEventOnConnected = function (sortableElement, event) {\n  sortables.forEach(function (target) {\n    if (_listsConnected(sortableElement, target)) {\n      target.dispatchEvent(event)\n    }\n  })\n}\n\n/**\n * Creates and returns a new debounced version of the passed function which will postpone its execution until after wait milliseconds have elapsed\n * @param {fn} Function to debounce\n * @param {delay} time to wait before calling function with latest arguments, 0 - no debounce\n * @param {context} time to wait before calling function with latest arguments, 0 - no debounce\n * @returns {function} - debounced function\n */\nfunction _debounce (fn, delay, context) {\n  var timer = null\n\n  if (delay === 0) {\n    return fn\n  }\n  return function () {\n    var eContext = context || this\n    var args = arguments\n    clearTimeout(timer)\n    timer = setTimeout(function () {\n      fn.apply(eContext, args)\n    }, delay)\n  }\n}\n\nvar _getChildren = function (element) {\n  return element.children\n}\n\nvar _serialize = function (list) {\n  var children = _filter(_getChildren(list), _data(list, 'items'))\n  return children\n}\n\n/*\n * Public sortable object\n * @param {Array|NodeList} sortableElements\n * @param {object|string} options|method\n */\nvar sortable = function (sortableElements, options) {\n  var method = String(options)\n\n  options = (function (options) {\n    var result = {\n      connectWith: false,\n      placeholder: null,\n      disableIEFix: false,\n      placeholderClass: 'sortable-placeholder',\n      draggingClass: 'sortable-dragging',\n      hoverClass: false,\n      debounce: 0,\n      maxItems: 0\n    }\n    for (var option in options) {\n      result[option] = options[option]\n    }\n    return result\n  })(options)\n\n  if (options && typeof options.getChildren === 'function') {\n    _getChildren = options.getChildren\n  }\n\n  if (typeof sortableElements === 'string') {\n    sortableElements = document.querySelectorAll(sortableElements)\n  }\n\n  if (sortableElements instanceof window.Element) {\n    sortableElements = [sortableElements]\n  }\n\n  sortableElements = Array.prototype.slice.call(sortableElements)\n\n  if (/serialize/.test(method)) {\n    var serialized = []\n    sortableElements.forEach(function (sortableElement) {\n      serialized.push({\n        list: sortableElement,\n        children: _serialize(sortableElement)\n      })\n    })\n    return serialized\n  }\n\n  /* TODO: maxstatements should be 25, fix and remove line below */\n  /* jshint maxstatements:false */\n  sortableElements.forEach(function (sortableElement) {\n    if (/enable|disable|destroy/.test(method)) {\n      return sortable[method](sortableElement)\n    }\n\n    // get options & set options on sortable\n    options = _data(sortableElement, 'opts') || options\n    _data(sortableElement, 'opts', options)\n    // reset sortable\n    _reloadSortable(sortableElement)\n    // initialize\n    var items = _filter(_getChildren(sortableElement), options.items)\n    var index\n    var startParent\n    var startList\n    var placeholder = options.placeholder\n    var maxItems\n    if (!placeholder) {\n      placeholder = document.createElement(\n        /^ul|ol$/i.test(sortableElement.tagName) ? 'li' : 'div'\n      )\n    }\n    placeholder = _html2element(placeholder, sortableElement.tagName)\n    placeholder.classList.add.apply(\n      placeholder.classList,\n      options.placeholderClass.split(' ')\n    )\n\n    // setup sortable ids\n    if (!sortableElement.getAttribute('data-sortable-id')) {\n      var id = sortables.length\n      sortables[id] = sortableElement\n      _attr(sortableElement, 'data-sortable-id', id)\n      _attr(items, 'data-item-sortable-id', id)\n    }\n\n    _data(sortableElement, 'items', options.items)\n    placeholders.push(placeholder)\n    if (options.connectWith) {\n      _data(sortableElement, 'connectWith', options.connectWith)\n    }\n\n    _enableSortable(sortableElement)\n    _attr(items, 'role', 'option')\n    _attr(items, 'aria-grabbed', 'false')\n\n    // Mouse over class\n    if (options.hoverClass) {\n      var hoverClass = 'sortable-over'\n      if (typeof options.hoverClass === 'string') {\n        hoverClass = options.hoverClass\n      }\n\n      _on(items, 'mouseenter', function () {\n        this.classList.add(hoverClass)\n      })\n      _on(items, 'mouseleave', function () {\n        this.classList.remove(hoverClass)\n      })\n    }\n\n    // max items\n    if (options.maxItems && typeof options.maxItems === 'number') {\n      maxItems = options.maxItems\n    }\n\n    // Handle drag events on draggable items\n    _on(items, 'dragstart', function (e) {\n      e.stopImmediatePropagation()\n      if ((options.handle && !_matches(e.target, options.handle)) || this.getAttribute('draggable') === 'false') {\n        return\n      }\n\n      // add transparent clone or other ghost to cursor\n      _getGhost(e, this)\n      // cache selsection & add attr for dragging\n      this.classList.add(options.draggingClass)\n      dragging = this\n      _attr(dragging, 'aria-grabbed', 'true')\n      // grab values\n      index = _index(dragging)\n      draggingHeight = parseInt(window.getComputedStyle(dragging).height)\n      startParent = this.parentElement\n      startList = _serialize(startParent)\n      // dispatch sortstart event on each element in group\n      _dispatchEventOnConnected(sortableElement, _makeEvent('sortstart', {\n        item: dragging,\n        placeholder: placeholder,\n        startparent: startParent\n      }))\n    })\n    // Handle drag events on draggable items\n    _on(items, 'dragend', function () {\n      var newParent\n      if (!dragging) {\n        return\n      }\n      // remove dragging attributes and show item\n      dragging.classList.remove(options.draggingClass)\n      _attr(dragging, 'aria-grabbed', 'false')\n      dragging.style.display = dragging.oldDisplay\n      delete dragging.oldDisplay\n\n      placeholders.forEach(_detach)\n      newParent = this.parentElement\n      _dispatchEventOnConnected(sortableElement, _makeEvent('sortstop', {\n        item: dragging,\n        startparent: startParent\n      }))\n      if (index !== _index(dragging) || startParent !== newParent) {\n        _dispatchEventOnConnected(sortableElement, _makeEvent('sortupdate', {\n          item: dragging,\n          index: _filter(_getChildren(newParent), _data(newParent, 'items'))\n              .indexOf(dragging),\n          oldindex: items.indexOf(dragging),\n          elementIndex: _index(dragging),\n          oldElementIndex: index,\n          startparent: startParent,\n          endparent: newParent,\n          newEndList: _serialize(newParent),\n          newStartList: _serialize(startParent),\n          oldStartList: startList\n        }))\n      }\n      dragging = null\n      draggingHeight = null\n    })\n    // Handle drop event on sortable & placeholder\n    // TODO: REMOVE placeholder?????\n    _on([sortableElement, placeholder], 'drop', function (e) {\n      var visiblePlaceholder\n      if (!_listsConnected(sortableElement, dragging.parentElement)) {\n        return\n      }\n\n      e.preventDefault()\n      e.stopPropagation()\n      visiblePlaceholder = placeholders.filter(_attached)[0]\n      _after(visiblePlaceholder, dragging)\n      dragging.dispatchEvent(_makeEvent('dragend'))\n    })\n\n    var debouncedDragOverEnter = _debounce(function (element, pageY) {\n      if (!dragging) {\n        return\n      }\n\n      if (items.indexOf(element) !== -1) {\n        var thisHeight = parseInt(window.getComputedStyle(element).height)\n        var placeholderIndex = _index(placeholder)\n        var thisIndex = _index(element)\n        if (options.forcePlaceholderSize) {\n          placeholder.style.height = draggingHeight + 'px'\n        }\n\n        // Check if `element` is bigger than the draggable. If it is, we have to define a dead zone to prevent flickering\n        if (thisHeight > draggingHeight) {\n          // Dead zone?\n          var deadZone = thisHeight - draggingHeight\n          var offsetTop = _offset(element).top\n          if (placeholderIndex < thisIndex &&\n              pageY < offsetTop + deadZone) {\n            return\n          }\n          if (placeholderIndex > thisIndex &&\n              pageY > offsetTop + thisHeight - deadZone) {\n            return\n          }\n        }\n\n        if (dragging.oldDisplay === undefined) {\n          dragging.oldDisplay = dragging.style.display\n        }\n\n        if (dragging.style.display !== 'none') {\n          dragging.style.display = 'none'\n        }\n\n        if (placeholderIndex < thisIndex) {\n          _after(element, placeholder)\n        } else {\n          _before(element, placeholder)\n        }\n        // Intentionally violated chaining, it is more complex otherwise\n        placeholders\n          .filter(function (element) { return element !== placeholder })\n          .forEach(_detach)\n      } else {\n        if (placeholders.indexOf(element) === -1 &&\n            !_filter(_getChildren(element), options.items).length) {\n          placeholders.forEach(_detach)\n          element.appendChild(placeholder)\n        }\n      }\n    }, options.debounce)\n\n    // Handle dragover and dragenter events on draggable items\n    var onDragOverEnter = function (e) {\n      if (!dragging || !_listsConnected(sortableElement, dragging.parentElement) || _data(sortableElement, '_disabled') === 'true') {\n        return\n      }\n      if (maxItems && _filter(_getChildren(sortableElement), _data(sortableElement, 'items')).length >= maxItems) {\n        return\n      }\n      e.preventDefault()\n      e.stopPropagation()\n      e.dataTransfer.dropEffect = 'move'\n      debouncedDragOverEnter(this, e.pageY)\n    }\n\n    _on(items.concat(sortableElement), 'dragover', onDragOverEnter)\n    _on(items.concat(sortableElement), 'dragenter', onDragOverEnter)\n  })\n\n  return sortableElements\n}\n\nsortable.destroy = function (sortableElement) {\n  _destroySortable(sortableElement)\n}\n\nsortable.enable = function (sortableElement) {\n  _enableSortable(sortableElement)\n}\n\nsortable.disable = function (sortableElement) {\n  _disableSortable(sortableElement)\n}\n\n\nreturn sortable;\n}));\n"]}
\ No newline at end of file
diff --git a/gulpfile.js b/gulpfile.js
index 3f1c5103..aea0ca46 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -5,6 +5,7 @@ var gulp = require('gulp')
 var rename = require('gulp-rename')
 var uglify = require('gulp-uglify')
 var sourcemaps = require('gulp-sourcemaps')
+var pump = require('pump')
 var umd = require('gulp-umd')
 var strip = require('gulp-strip-code')
 
@@ -28,17 +29,19 @@ gulp.task('umd', function () {
 })
 /* ---------- */
 /* build */
-gulp.task('minify', ['umd'], function () {
+gulp.task('minify', ['umd'], function (cb) {
   // copy files to dist
-  gulp.src(['dist/html.sortable.js'])
+  pump([
+    gulp.src(['dist/html.sortable.js'])
     .pipe(sourcemaps.init({loadMaps: true}))
-    .pipe(uglify())
     .pipe(rename({
       suffix: '.min'
-    }))
-    .pipe(sourcemaps.write('./'))
-    .pipe(gulp.dest('./dist'))
-    .pipe(gulp.dest('./docs'))
+    })),
+    uglify(),
+    sourcemaps.write('./'),
+    gulp.dest('./dist'),
+    gulp.dest('./docs')
+  ],cb)
 })
 /* ---------- */
 /* tasks */
diff --git a/package-lock.json b/package-lock.json
index bf16bedd..a0ad421d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3917,6 +3917,28 @@
       "integrity": "sha1-4mDHj2Fhzdmw5WzD4Khd4Xx6V74=",
       "dev": true
     },
+    "pump": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/pump/-/pump-1.0.2.tgz",
+      "integrity": "sha1-Oz7mUS+U8OV1U4wXmV+fFpkKXVE=",
+      "dev": true,
+      "dependencies": {
+        "end-of-stream": {
+          "version": "1.4.0",
+          "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.0.tgz",
+          "integrity": "sha1-epDYM+/abPpurA9JSduw+tOmMgY=",
+          "dev": true,
+          "dependencies": {
+            "once": {
+              "version": "1.4.0",
+              "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+              "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+              "dev": true
+            }
+          }
+        }
+      }
+    },
     "punycode": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
diff --git a/package.json b/package.json
index e7276fd0..501d76eb 100644
--- a/package.json
+++ b/package.json
@@ -28,12 +28,13 @@
     "gulp-rename": "^1.2.2",
     "gulp-sourcemaps": "^1.12.0",
     "gulp-strip-code": "^0.1.2",
-    "gulp-uglify": "^1.2.0",
+    "gulp-uglify": "^3.0.0",
     "gulp-umd": "^0.2.1",
     "istanbul": "0.4.x",
     "jsdom": "10.*",
     "mocha": "^3.4.2",
     "nyc": "^11.0.0",
+    "pump": "^1.0.2",
     "requirejs": "^2.3.*",
     "snazzy": "^6.0.0",
     "standard": "^10.0.*",
diff --git a/src/html.sortable.js b/src/html.sortable.js
index 71acb235..7ee71f5c 100644
--- a/src/html.sortable.js
+++ b/src/html.sortable.js
@@ -502,7 +502,7 @@ var sortable = function (sortableElements, options) {
   sortableElements = Array.prototype.slice.call(sortableElements)
 
   if (/serialize/.test(method)) {
-    let serialized = []
+    var serialized = []
     sortableElements.forEach(function (sortableElement) {
       serialized.push({
         list: sortableElement,