diff --git a/dist/vivus.js b/dist/vivus.js
index 23505e6..965b873 100644
--- a/dist/vivus.js
+++ b/dist/vivus.js
@@ -1,13 +1,13 @@
 /**
  * vivus - JavaScript library to make drawing animation on SVG
- * @version v0.4.0
+ * @version v0.4.1
  * @link https://github.com/maxwellito/vivus
  * @license MIT
  */
 
 'use strict';
 
-(function (window, document) {
+(function () {
 
   'use strict';
 
@@ -268,7 +268,7 @@ Pathformer.prototype.parseAttr = function (element) {
 
   'use strict';
 
-var requestAnimFrame, cancelAnimFrame, parsePositiveInt;
+var setupEnv, requestAnimFrame, cancelAnimFrame, parsePositiveInt;
 
 /**
  * Vivus
@@ -320,6 +320,8 @@ var requestAnimFrame, cancelAnimFrame, parsePositiveInt;
  */
 function Vivus (element, options, callback) {
 
+  setupEnv();
+
   // Setup
   this.isReady = false;
   this.setElement(element, options);
@@ -953,12 +955,6 @@ Vivus.prototype.isInViewport = function (el, h) {
   return (elTop + elHeight * h) <= viewed && (elBottom) >= scrolled;
 };
 
-/**
- * Alias for document element
- *
- * @type {DOMelement}
- */
-Vivus.prototype.docElem = window.document.documentElement;
 
 /**
  * Get the viewport height in pixels
@@ -986,41 +982,55 @@ Vivus.prototype.scrollY = function () {
   return window.pageYOffset || this.docElem.scrollTop;
 };
 
-/**
- * Alias for `requestAnimationFrame` or
- * `setTimeout` function for deprecated browsers.
- *
- */
-requestAnimFrame = (function () {
-  return (
-    window.requestAnimationFrame       ||
-    window.webkitRequestAnimationFrame ||
-    window.mozRequestAnimationFrame    ||
-    window.oRequestAnimationFrame      ||
-    window.msRequestAnimationFrame     ||
-    function(/* function */ callback){
-      return window.setTimeout(callback, 1000 / 60);
-    }
-  );
-})();
+setupEnv = function () {
 
-/**
- * Alias for `cancelAnimationFrame` or
- * `cancelTimeout` function for deprecated browsers.
- *
- */
-cancelAnimFrame = (function () {
-  return (
-    window.cancelAnimationFrame       ||
-    window.webkitCancelAnimationFrame ||
-    window.mozCancelAnimationFrame    ||
-    window.oCancelAnimationFrame      ||
-    window.msCancelAnimationFrame     ||
-    function(id){
-      return window.clearTimeout(id);
-    }
-  );
-})();
+  if (Vivus.prototype.docElem) {
+    return;
+  }
+
+  /**
+   * Alias for document element
+   *
+   * @type {DOMelement}
+   */
+  Vivus.prototype.docElem = window.document.documentElement;
+
+  /**
+   * Alias for `requestAnimationFrame` or
+   * `setTimeout` function for deprecated browsers.
+   *
+   */
+  requestAnimFrame = (function () {
+    return (
+      window.requestAnimationFrame       ||
+      window.webkitRequestAnimationFrame ||
+      window.mozRequestAnimationFrame    ||
+      window.oRequestAnimationFrame      ||
+      window.msRequestAnimationFrame     ||
+      function(/* function */ callback){
+        return window.setTimeout(callback, 1000 / 60);
+      }
+    );
+  })();
+
+  /**
+   * Alias for `cancelAnimationFrame` or
+   * `cancelTimeout` function for deprecated browsers.
+   *
+   */
+  cancelAnimFrame = (function () {
+    return (
+      window.cancelAnimationFrame       ||
+      window.webkitCancelAnimationFrame ||
+      window.mozCancelAnimationFrame    ||
+      window.oCancelAnimationFrame      ||
+      window.msCancelAnimationFrame     ||
+      function(id){
+        return window.clearTimeout(id);
+      }
+    );
+  })();
+};
 
 /**
  * Parse string to integer.
@@ -1054,4 +1064,4 @@ parsePositiveInt = function (value, defaultValue) {
     window.Vivus = Vivus;
   }
 
-}(window, document));
+}());
diff --git a/dist/vivus.min.js b/dist/vivus.min.js
index 57f2b07..b7f3656 100644
--- a/dist/vivus.min.js
+++ b/dist/vivus.min.js
@@ -1,7 +1,7 @@
 /**
  * vivus - JavaScript library to make drawing animation on SVG
- * @version v0.4.0
+ * @version v0.4.1
  * @link https://github.com/maxwellito/vivus
  * @license MIT
  */
-"use strict";!function(t,e){function r(r){if("undefined"==typeof r)throw new Error('Pathformer [constructor]: "element" parameter is required');if(r.constructor===String&&(r=e.getElementById(r),!r))throw new Error('Pathformer [constructor]: "element" parameter is not related to an existing ID');if(!(r.constructor instanceof t.SVGElement||/^svg$/i.test(r.nodeName)))throw new Error('Pathformer [constructor]: "element" parameter must be a string or a SVGelement');this.el=r,this.scan(r)}function n(t,e,r){this.isReady=!1,this.setElement(t,e),this.setOptions(e),this.setCallback(r),this.isReady&&this.init()}r.prototype.TYPES=["line","ellipse","circle","polygon","polyline","rect"],r.prototype.ATTR_WATCH=["cx","cy","points","r","rx","ry","x","x1","x2","y","y1","y2"],r.prototype.scan=function(t){for(var e,r,n,i,a=t.querySelectorAll(this.TYPES.join(",")),s=0;s<a.length;s++)r=a[s],e=this[r.tagName.toLowerCase()+"ToPath"],n=e(this.parseAttr(r.attributes)),i=this.pathMaker(r,n),r.parentNode.replaceChild(i,r)},r.prototype.lineToPath=function(t){var e={},r=t.x1||0,n=t.y1||0,i=t.x2||0,a=t.y2||0;return e.d="M"+r+","+n+"L"+i+","+a,e},r.prototype.rectToPath=function(t){var e={},r=parseFloat(t.x)||0,n=parseFloat(t.y)||0,i=parseFloat(t.width)||0,a=parseFloat(t.height)||0;return e.d="M"+r+" "+n+" ",e.d+="L"+(r+i)+" "+n+" ",e.d+="L"+(r+i)+" "+(n+a)+" ",e.d+="L"+r+" "+(n+a)+" Z",e},r.prototype.polylineToPath=function(t){var e,r,n={},i=t.points.trim().split(" ");if(-1===t.points.indexOf(",")){var a=[];for(e=0;e<i.length;e+=2)a.push(i[e]+","+i[e+1]);i=a}for(r="M"+i[0],e=1;e<i.length;e++)-1!==i[e].indexOf(",")&&(r+="L"+i[e]);return n.d=r,n},r.prototype.polygonToPath=function(t){var e=r.prototype.polylineToPath(t);return e.d+="Z",e},r.prototype.ellipseToPath=function(t){var e={},r=parseFloat(t.rx)||0,n=parseFloat(t.ry)||0,i=parseFloat(t.cx)||0,a=parseFloat(t.cy)||0,s=i-r,o=a,h=parseFloat(i)+parseFloat(r),l=a;return e.d="M"+s+","+o+"A"+r+","+n+" 0,1,1 "+h+","+l+"A"+r+","+n+" 0,1,1 "+s+","+l,e},r.prototype.circleToPath=function(t){var e={},r=parseFloat(t.r)||0,n=parseFloat(t.cx)||0,i=parseFloat(t.cy)||0,a=n-r,s=i,o=parseFloat(n)+parseFloat(r),h=i;return e.d="M"+a+","+s+"A"+r+","+r+" 0,1,1 "+o+","+h+"A"+r+","+r+" 0,1,1 "+a+","+h,e},r.prototype.pathMaker=function(t,r){var n,i,a=e.createElementNS("http://www.w3.org/2000/svg","path");for(n=0;n<t.attributes.length;n++)i=t.attributes[n],-1===this.ATTR_WATCH.indexOf(i.name)&&a.setAttribute(i.name,i.value);for(n in r)a.setAttribute(n,r[n]);return a},r.prototype.parseAttr=function(t){for(var e,r={},n=0;n<t.length;n++){if(e=t[n],-1!==this.ATTR_WATCH.indexOf(e.name)&&-1!==e.value.indexOf("%"))throw new Error("Pathformer [parseAttr]: a SVG shape got values in percentage. This cannot be transformed into 'path' tags. Please use 'viewBox'.");r[e.name]=e.value}return r};var i,a,s;n.LINEAR=function(t){return t},n.EASE=function(t){return-Math.cos(t*Math.PI)/2+.5},n.EASE_OUT=function(t){return 1-Math.pow(1-t,3)},n.EASE_IN=function(t){return Math.pow(t,3)},n.EASE_OUT_BOUNCE=function(t){var e=-Math.cos(.5*t*Math.PI)+1,r=Math.pow(e,1.5),n=Math.pow(1-t,2),i=-Math.abs(Math.cos(2.5*r*Math.PI))+1;return 1-n+i*n},n.prototype.setElement=function(r,n){if("undefined"==typeof r)throw new Error('Vivus [constructor]: "element" parameter is required');if(r.constructor===String&&(r=e.getElementById(r),!r))throw new Error('Vivus [constructor]: "element" parameter is not related to an existing ID');if(this.parentEl=r,n&&n.file){var i=e.createElement("object");i.setAttribute("type","image/svg+xml"),i.setAttribute("data",n.file),i.setAttribute("built-by-vivus","true"),r.appendChild(i),r=i}switch(r.constructor){case t.SVGSVGElement:case t.SVGElement:this.el=r,this.isReady=!0;break;case t.HTMLObjectElement:var a,s;s=this,a=function(t){if(!s.isReady){if(s.el=r.contentDocument&&r.contentDocument.querySelector("svg"),!s.el&&t)throw new Error("Vivus [constructor]: object loaded does not contain any SVG");return s.el?(r.getAttribute("built-by-vivus")&&(s.parentEl.insertBefore(s.el,r),s.parentEl.removeChild(r),s.el.setAttribute("width","100%"),s.el.setAttribute("height","100%")),s.isReady=!0,s.init(),!0):void 0}},a()||r.addEventListener("load",a);break;default:throw new Error('Vivus [constructor]: "element" parameter is not valid (or miss the "file" attribute)')}},n.prototype.setOptions=function(e){var r=["delayed","sync","async","nsync","oneByOne","scenario","scenario-sync"],i=["inViewport","manual","autostart"];if(void 0!==e&&e.constructor!==Object)throw new Error('Vivus [constructor]: "options" parameter must be an object');if(e=e||{},e.type&&-1===r.indexOf(e.type))throw new Error("Vivus [constructor]: "+e.type+" is not an existing animation `type`");if(this.type=e.type||r[0],e.start&&-1===i.indexOf(e.start))throw new Error("Vivus [constructor]: "+e.start+" is not an existing `start` option");if(this.start=e.start||i[0],this.isIE=-1!==t.navigator.userAgent.indexOf("MSIE")||-1!==t.navigator.userAgent.indexOf("Trident/")||-1!==t.navigator.userAgent.indexOf("Edge/"),this.duration=s(e.duration,120),this.delay=s(e.delay,null),this.dashGap=s(e.dashGap,1),this.forceRender=e.hasOwnProperty("forceRender")?!!e.forceRender:this.isIE,this.reverseStack=!!e.reverseStack,this.selfDestroy=!!e.selfDestroy,this.onReady=e.onReady,this.map=[],this.frameLength=this.currentFrame=this.delayUnit=this.speed=this.handle=null,this.ignoreInvisible=e.hasOwnProperty("ignoreInvisible")?!!e.ignoreInvisible:!1,this.animTimingFunction=e.animTimingFunction||n.LINEAR,this.pathTimingFunction=e.pathTimingFunction||n.LINEAR,this.delay>=this.duration)throw new Error("Vivus [constructor]: delay must be shorter than duration")},n.prototype.setCallback=function(t){if(t&&t.constructor!==Function)throw new Error('Vivus [constructor]: "callback" parameter must be a function');this.callback=t||function(){}},n.prototype.mapping=function(){var e,r,n,i,a,o,h,l;for(l=o=h=0,r=this.el.querySelectorAll("path"),e=0;e<r.length;e++)n=r[e],this.isInvisible(n)||(a={el:n,length:Math.ceil(n.getTotalLength())},isNaN(a.length)?t.console&&console.warn&&console.warn("Vivus [mapping]: cannot retrieve a path element length",n):(this.map.push(a),n.style.strokeDasharray=a.length+" "+(a.length+2*this.dashGap),n.style.strokeDashoffset=a.length+this.dashGap,a.length+=this.dashGap,o+=a.length,this.renderPath(e)));for(o=0===o?1:o,this.delay=null===this.delay?this.duration/3:this.delay,this.delayUnit=this.delay/(r.length>1?r.length-1:1),this.reverseStack&&this.map.reverse(),e=0;e<this.map.length;e++){switch(a=this.map[e],this.type){case"delayed":a.startAt=this.delayUnit*e,a.duration=this.duration-this.delay;break;case"oneByOne":a.startAt=h/o*this.duration,a.duration=a.length/o*this.duration;break;case"sync":case"async":case"nsync":a.startAt=0,a.duration=this.duration;break;case"scenario-sync":n=a.el,i=this.parseAttr(n),a.startAt=l+(s(i["data-delay"],this.delayUnit)||0),a.duration=s(i["data-duration"],this.duration),l=void 0!==i["data-async"]?a.startAt:a.startAt+a.duration,this.frameLength=Math.max(this.frameLength,a.startAt+a.duration);break;case"scenario":n=a.el,i=this.parseAttr(n),a.startAt=s(i["data-start"],this.delayUnit)||0,a.duration=s(i["data-duration"],this.duration),this.frameLength=Math.max(this.frameLength,a.startAt+a.duration)}h+=a.length,this.frameLength=this.frameLength||this.duration}},n.prototype.drawer=function(){var t=this;if(this.currentFrame+=this.speed,this.currentFrame<=0)this.stop(),this.reset();else{if(!(this.currentFrame>=this.frameLength))return this.trace(),this.handle=i(function(){t.drawer()}),void 0;this.stop(),this.currentFrame=this.frameLength,this.trace(),this.selfDestroy&&this.destroy()}this.callback(this),this.instanceCallback&&(this.instanceCallback(this),this.instanceCallback=null)},n.prototype.trace=function(){var t,e,r,n;for(n=this.animTimingFunction(this.currentFrame/this.frameLength)*this.frameLength,t=0;t<this.map.length;t++)r=this.map[t],e=(n-r.startAt)/r.duration,e=this.pathTimingFunction(Math.max(0,Math.min(1,e))),r.progress!==e&&(r.progress=e,r.el.style.strokeDashoffset=Math.floor(r.length*(1-e)),this.renderPath(t))},n.prototype.renderPath=function(t){if(this.forceRender&&this.map&&this.map[t]){var e=this.map[t],r=e.el.cloneNode(!0);e.el.parentNode.replaceChild(r,e.el),e.el=r}},n.prototype.init=function(){this.frameLength=0,this.currentFrame=0,this.map=[],new r(this.el),this.mapping(),this.starter(),this.onReady&&this.onReady(this)},n.prototype.starter=function(){switch(this.start){case"manual":return;case"autostart":this.play();break;case"inViewport":var e=this,r=function(){e.isInViewport(e.parentEl,1)&&(e.play(),t.removeEventListener("scroll",r))};t.addEventListener("scroll",r),r()}},n.prototype.getStatus=function(){return 0===this.currentFrame?"start":this.currentFrame===this.frameLength?"end":"progress"},n.prototype.reset=function(){return this.setFrameProgress(0)},n.prototype.finish=function(){return this.setFrameProgress(1)},n.prototype.setFrameProgress=function(t){return t=Math.min(1,Math.max(0,t)),this.currentFrame=Math.round(this.frameLength*t),this.trace(),this},n.prototype.play=function(t,e){if(this.instanceCallback=null,t&&"function"==typeof t)this.instanceCallback=t,t=null;else if(t&&"number"!=typeof t)throw new Error("Vivus [play]: invalid speed");return e&&"function"==typeof e&&!this.instanceCallback&&(this.instanceCallback=e),this.speed=t||1,this.handle||this.drawer(),this},n.prototype.stop=function(){return this.handle&&(a(this.handle),this.handle=null),this},n.prototype.destroy=function(){this.stop();var t,e;for(t=0;t<this.map.length;t++)e=this.map[t],e.el.style.strokeDashoffset=null,e.el.style.strokeDasharray=null,this.renderPath(t)},n.prototype.isInvisible=function(t){var e,r=t.getAttribute("data-ignore");return null!==r?"false"!==r:this.ignoreInvisible?(e=t.getBoundingClientRect(),!e.width&&!e.height):!1},n.prototype.parseAttr=function(t){var e,r={};if(t&&t.attributes)for(var n=0;n<t.attributes.length;n++)e=t.attributes[n],r[e.name]=e.value;return r},n.prototype.isInViewport=function(t,e){var r=this.scrollY(),n=r+this.getViewportH(),i=t.getBoundingClientRect(),a=i.height,s=r+i.top,o=s+a;return e=e||0,n>=s+a*e&&o>=r},n.prototype.docElem=t.document.documentElement,n.prototype.getViewportH=function(){var e=this.docElem.clientHeight,r=t.innerHeight;return r>e?r:e},n.prototype.scrollY=function(){return t.pageYOffset||this.docElem.scrollTop},i=function(){return t.requestAnimationFrame||t.webkitRequestAnimationFrame||t.mozRequestAnimationFrame||t.oRequestAnimationFrame||t.msRequestAnimationFrame||function(e){return t.setTimeout(e,1e3/60)}}(),a=function(){return t.cancelAnimationFrame||t.webkitCancelAnimationFrame||t.mozCancelAnimationFrame||t.oCancelAnimationFrame||t.msCancelAnimationFrame||function(e){return t.clearTimeout(e)}}(),s=function(t,e){var r=parseInt(t,10);return r>=0?r:e},"function"==typeof define&&define.amd?define([],function(){return n}):"object"==typeof exports?module.exports=n:t.Vivus=n}(window,document);
\ No newline at end of file
+"use strict";!function(){function t(t){if("undefined"==typeof t)throw new Error('Pathformer [constructor]: "element" parameter is required');if(t.constructor===String&&(t=document.getElementById(t),!t))throw new Error('Pathformer [constructor]: "element" parameter is not related to an existing ID');if(!(t.constructor instanceof window.SVGElement||/^svg$/i.test(t.nodeName)))throw new Error('Pathformer [constructor]: "element" parameter must be a string or a SVGelement');this.el=t,this.scan(t)}function e(t,e,n){r(),this.isReady=!1,this.setElement(t,e),this.setOptions(e),this.setCallback(n),this.isReady&&this.init()}t.prototype.TYPES=["line","ellipse","circle","polygon","polyline","rect"],t.prototype.ATTR_WATCH=["cx","cy","points","r","rx","ry","x","x1","x2","y","y1","y2"],t.prototype.scan=function(t){for(var e,r,n,i,a=t.querySelectorAll(this.TYPES.join(",")),o=0;o<a.length;o++)r=a[o],e=this[r.tagName.toLowerCase()+"ToPath"],n=e(this.parseAttr(r.attributes)),i=this.pathMaker(r,n),r.parentNode.replaceChild(i,r)},t.prototype.lineToPath=function(t){var e={},r=t.x1||0,n=t.y1||0,i=t.x2||0,a=t.y2||0;return e.d="M"+r+","+n+"L"+i+","+a,e},t.prototype.rectToPath=function(t){var e={},r=parseFloat(t.x)||0,n=parseFloat(t.y)||0,i=parseFloat(t.width)||0,a=parseFloat(t.height)||0;return e.d="M"+r+" "+n+" ",e.d+="L"+(r+i)+" "+n+" ",e.d+="L"+(r+i)+" "+(n+a)+" ",e.d+="L"+r+" "+(n+a)+" Z",e},t.prototype.polylineToPath=function(t){var e,r,n={},i=t.points.trim().split(" ");if(-1===t.points.indexOf(",")){var a=[];for(e=0;e<i.length;e+=2)a.push(i[e]+","+i[e+1]);i=a}for(r="M"+i[0],e=1;e<i.length;e++)-1!==i[e].indexOf(",")&&(r+="L"+i[e]);return n.d=r,n},t.prototype.polygonToPath=function(e){var r=t.prototype.polylineToPath(e);return r.d+="Z",r},t.prototype.ellipseToPath=function(t){var e={},r=parseFloat(t.rx)||0,n=parseFloat(t.ry)||0,i=parseFloat(t.cx)||0,a=parseFloat(t.cy)||0,o=i-r,s=a,h=parseFloat(i)+parseFloat(r),l=a;return e.d="M"+o+","+s+"A"+r+","+n+" 0,1,1 "+h+","+l+"A"+r+","+n+" 0,1,1 "+o+","+l,e},t.prototype.circleToPath=function(t){var e={},r=parseFloat(t.r)||0,n=parseFloat(t.cx)||0,i=parseFloat(t.cy)||0,a=n-r,o=i,s=parseFloat(n)+parseFloat(r),h=i;return e.d="M"+a+","+o+"A"+r+","+r+" 0,1,1 "+s+","+h+"A"+r+","+r+" 0,1,1 "+a+","+h,e},t.prototype.pathMaker=function(t,e){var r,n,i=document.createElementNS("http://www.w3.org/2000/svg","path");for(r=0;r<t.attributes.length;r++)n=t.attributes[r],-1===this.ATTR_WATCH.indexOf(n.name)&&i.setAttribute(n.name,n.value);for(r in e)i.setAttribute(r,e[r]);return i},t.prototype.parseAttr=function(t){for(var e,r={},n=0;n<t.length;n++){if(e=t[n],-1!==this.ATTR_WATCH.indexOf(e.name)&&-1!==e.value.indexOf("%"))throw new Error("Pathformer [parseAttr]: a SVG shape got values in percentage. This cannot be transformed into 'path' tags. Please use 'viewBox'.");r[e.name]=e.value}return r};var r,n,i,a;e.LINEAR=function(t){return t},e.EASE=function(t){return-Math.cos(t*Math.PI)/2+.5},e.EASE_OUT=function(t){return 1-Math.pow(1-t,3)},e.EASE_IN=function(t){return Math.pow(t,3)},e.EASE_OUT_BOUNCE=function(t){var e=-Math.cos(.5*t*Math.PI)+1,r=Math.pow(e,1.5),n=Math.pow(1-t,2),i=-Math.abs(Math.cos(2.5*r*Math.PI))+1;return 1-n+i*n},e.prototype.setElement=function(t,e){if("undefined"==typeof t)throw new Error('Vivus [constructor]: "element" parameter is required');if(t.constructor===String&&(t=document.getElementById(t),!t))throw new Error('Vivus [constructor]: "element" parameter is not related to an existing ID');if(this.parentEl=t,e&&e.file){var r=document.createElement("object");r.setAttribute("type","image/svg+xml"),r.setAttribute("data",e.file),r.setAttribute("built-by-vivus","true"),t.appendChild(r),t=r}switch(t.constructor){case window.SVGSVGElement:case window.SVGElement:this.el=t,this.isReady=!0;break;case window.HTMLObjectElement:var n,i;i=this,n=function(e){if(!i.isReady){if(i.el=t.contentDocument&&t.contentDocument.querySelector("svg"),!i.el&&e)throw new Error("Vivus [constructor]: object loaded does not contain any SVG");return i.el?(t.getAttribute("built-by-vivus")&&(i.parentEl.insertBefore(i.el,t),i.parentEl.removeChild(t),i.el.setAttribute("width","100%"),i.el.setAttribute("height","100%")),i.isReady=!0,i.init(),!0):void 0}},n()||t.addEventListener("load",n);break;default:throw new Error('Vivus [constructor]: "element" parameter is not valid (or miss the "file" attribute)')}},e.prototype.setOptions=function(t){var r=["delayed","sync","async","nsync","oneByOne","scenario","scenario-sync"],n=["inViewport","manual","autostart"];if(void 0!==t&&t.constructor!==Object)throw new Error('Vivus [constructor]: "options" parameter must be an object');if(t=t||{},t.type&&-1===r.indexOf(t.type))throw new Error("Vivus [constructor]: "+t.type+" is not an existing animation `type`");if(this.type=t.type||r[0],t.start&&-1===n.indexOf(t.start))throw new Error("Vivus [constructor]: "+t.start+" is not an existing `start` option");if(this.start=t.start||n[0],this.isIE=-1!==window.navigator.userAgent.indexOf("MSIE")||-1!==window.navigator.userAgent.indexOf("Trident/")||-1!==window.navigator.userAgent.indexOf("Edge/"),this.duration=a(t.duration,120),this.delay=a(t.delay,null),this.dashGap=a(t.dashGap,1),this.forceRender=t.hasOwnProperty("forceRender")?!!t.forceRender:this.isIE,this.reverseStack=!!t.reverseStack,this.selfDestroy=!!t.selfDestroy,this.onReady=t.onReady,this.map=[],this.frameLength=this.currentFrame=this.delayUnit=this.speed=this.handle=null,this.ignoreInvisible=t.hasOwnProperty("ignoreInvisible")?!!t.ignoreInvisible:!1,this.animTimingFunction=t.animTimingFunction||e.LINEAR,this.pathTimingFunction=t.pathTimingFunction||e.LINEAR,this.delay>=this.duration)throw new Error("Vivus [constructor]: delay must be shorter than duration")},e.prototype.setCallback=function(t){if(t&&t.constructor!==Function)throw new Error('Vivus [constructor]: "callback" parameter must be a function');this.callback=t||function(){}},e.prototype.mapping=function(){var t,e,r,n,i,o,s,h;for(h=o=s=0,e=this.el.querySelectorAll("path"),t=0;t<e.length;t++)r=e[t],this.isInvisible(r)||(i={el:r,length:Math.ceil(r.getTotalLength())},isNaN(i.length)?window.console&&console.warn&&console.warn("Vivus [mapping]: cannot retrieve a path element length",r):(this.map.push(i),r.style.strokeDasharray=i.length+" "+(i.length+2*this.dashGap),r.style.strokeDashoffset=i.length+this.dashGap,i.length+=this.dashGap,o+=i.length,this.renderPath(t)));for(o=0===o?1:o,this.delay=null===this.delay?this.duration/3:this.delay,this.delayUnit=this.delay/(e.length>1?e.length-1:1),this.reverseStack&&this.map.reverse(),t=0;t<this.map.length;t++){switch(i=this.map[t],this.type){case"delayed":i.startAt=this.delayUnit*t,i.duration=this.duration-this.delay;break;case"oneByOne":i.startAt=s/o*this.duration,i.duration=i.length/o*this.duration;break;case"sync":case"async":case"nsync":i.startAt=0,i.duration=this.duration;break;case"scenario-sync":r=i.el,n=this.parseAttr(r),i.startAt=h+(a(n["data-delay"],this.delayUnit)||0),i.duration=a(n["data-duration"],this.duration),h=void 0!==n["data-async"]?i.startAt:i.startAt+i.duration,this.frameLength=Math.max(this.frameLength,i.startAt+i.duration);break;case"scenario":r=i.el,n=this.parseAttr(r),i.startAt=a(n["data-start"],this.delayUnit)||0,i.duration=a(n["data-duration"],this.duration),this.frameLength=Math.max(this.frameLength,i.startAt+i.duration)}s+=i.length,this.frameLength=this.frameLength||this.duration}},e.prototype.drawer=function(){var t=this;if(this.currentFrame+=this.speed,this.currentFrame<=0)this.stop(),this.reset();else{if(!(this.currentFrame>=this.frameLength))return this.trace(),this.handle=n(function(){t.drawer()}),void 0;this.stop(),this.currentFrame=this.frameLength,this.trace(),this.selfDestroy&&this.destroy()}this.callback(this),this.instanceCallback&&(this.instanceCallback(this),this.instanceCallback=null)},e.prototype.trace=function(){var t,e,r,n;for(n=this.animTimingFunction(this.currentFrame/this.frameLength)*this.frameLength,t=0;t<this.map.length;t++)r=this.map[t],e=(n-r.startAt)/r.duration,e=this.pathTimingFunction(Math.max(0,Math.min(1,e))),r.progress!==e&&(r.progress=e,r.el.style.strokeDashoffset=Math.floor(r.length*(1-e)),this.renderPath(t))},e.prototype.renderPath=function(t){if(this.forceRender&&this.map&&this.map[t]){var e=this.map[t],r=e.el.cloneNode(!0);e.el.parentNode.replaceChild(r,e.el),e.el=r}},e.prototype.init=function(){this.frameLength=0,this.currentFrame=0,this.map=[],new t(this.el),this.mapping(),this.starter(),this.onReady&&this.onReady(this)},e.prototype.starter=function(){switch(this.start){case"manual":return;case"autostart":this.play();break;case"inViewport":var t=this,e=function(){t.isInViewport(t.parentEl,1)&&(t.play(),window.removeEventListener("scroll",e))};window.addEventListener("scroll",e),e()}},e.prototype.getStatus=function(){return 0===this.currentFrame?"start":this.currentFrame===this.frameLength?"end":"progress"},e.prototype.reset=function(){return this.setFrameProgress(0)},e.prototype.finish=function(){return this.setFrameProgress(1)},e.prototype.setFrameProgress=function(t){return t=Math.min(1,Math.max(0,t)),this.currentFrame=Math.round(this.frameLength*t),this.trace(),this},e.prototype.play=function(t,e){if(this.instanceCallback=null,t&&"function"==typeof t)this.instanceCallback=t,t=null;else if(t&&"number"!=typeof t)throw new Error("Vivus [play]: invalid speed");return e&&"function"==typeof e&&!this.instanceCallback&&(this.instanceCallback=e),this.speed=t||1,this.handle||this.drawer(),this},e.prototype.stop=function(){return this.handle&&(i(this.handle),this.handle=null),this},e.prototype.destroy=function(){this.stop();var t,e;for(t=0;t<this.map.length;t++)e=this.map[t],e.el.style.strokeDashoffset=null,e.el.style.strokeDasharray=null,this.renderPath(t)},e.prototype.isInvisible=function(t){var e,r=t.getAttribute("data-ignore");return null!==r?"false"!==r:this.ignoreInvisible?(e=t.getBoundingClientRect(),!e.width&&!e.height):!1},e.prototype.parseAttr=function(t){var e,r={};if(t&&t.attributes)for(var n=0;n<t.attributes.length;n++)e=t.attributes[n],r[e.name]=e.value;return r},e.prototype.isInViewport=function(t,e){var r=this.scrollY(),n=r+this.getViewportH(),i=t.getBoundingClientRect(),a=i.height,o=r+i.top,s=o+a;return e=e||0,n>=o+a*e&&s>=r},e.prototype.getViewportH=function(){var t=this.docElem.clientHeight,e=window.innerHeight;return e>t?e:t},e.prototype.scrollY=function(){return window.pageYOffset||this.docElem.scrollTop},r=function(){e.prototype.docElem||(e.prototype.docElem=window.document.documentElement,n=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(t){return window.setTimeout(t,1e3/60)}}(),i=function(){return window.cancelAnimationFrame||window.webkitCancelAnimationFrame||window.mozCancelAnimationFrame||window.oCancelAnimationFrame||window.msCancelAnimationFrame||function(t){return window.clearTimeout(t)}}())},a=function(t,e){var r=parseInt(t,10);return r>=0?r:e},"function"==typeof define&&define.amd?define([],function(){return e}):"object"==typeof exports?module.exports=e:window.Vivus=e}();
\ No newline at end of file
diff --git a/package.json b/package.json
index f614bae..5cd6227 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vivus",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "JavaScript library to make drawing animation on SVG",
   "main": "dist/vivus.js",
   "scripts": {
diff --git a/src/vivus.js b/src/vivus.js
index 6853f7c..ea41b93 100755
--- a/src/vivus.js
+++ b/src/vivus.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var requestAnimFrame, cancelAnimFrame, parsePositiveInt;
+var setupEnv, requestAnimFrame, cancelAnimFrame, parsePositiveInt;
 
 /**
  * Vivus
@@ -714,7 +714,7 @@ Vivus.prototype.scrollY = function () {
   return window.pageYOffset || this.docElem.scrollTop;
 };
 
-var setupEnv = function () {
+setupEnv = function () {
 
   if (Vivus.prototype.docElem) {
     return;
@@ -762,7 +762,7 @@ var setupEnv = function () {
       }
     );
   })();
-}
+};
 
 /**
  * Parse string to integer.