!function(global,factory){"object"==typeof exports&&"undefined"!=typeof module?module.exports=factory():"function"==typeof define&&define.amd?define(factory):global.ResizeObserver=factory()}(this,function(){"use strict";function toFloat(value){return parseFloat(value)||0}function getBordersSize(styles){var positions=Array.prototype.slice.call(arguments,1);return positions.reduce(function(size,position){var value=styles["border-"+position+"-width"];return size+toFloat(value)},0)}function getPaddings(styles){for(var positions=["top","right","bottom","left"],paddings={},i=0,list=positions;i<list.length;i+=1){var position=list[i],value=styles["padding-"+position];paddings[position]=toFloat(value)}return paddings}function getSVGContentRect(target){var bbox=target.getBBox();return createRectInit(0,0,bbox.width,bbox.height)}function getHTMLElementContentRect(target){var clientWidth=target.clientWidth,clientHeight=target.clientHeight;if(!clientWidth&&!clientHeight)return emptyRect;var styles=getComputedStyle(target),paddings=getPaddings(styles),horizPad=paddings.left+paddings.right,vertPad=paddings.top+paddings.bottom,width=toFloat(styles.width),height=toFloat(styles.height);if("border-box"===styles.boxSizing&&(Math.round(width+horizPad)!==clientWidth&&(width-=getBordersSize(styles,"left","right")+horizPad),Math.round(height+vertPad)!==clientHeight&&(height-=getBordersSize(styles,"top","bottom")+vertPad)),!isDocumentElement(target)){var vertScrollbar=Math.round(width+horizPad)-clientWidth,horizScrollbar=Math.round(height+vertPad)-clientHeight;1!==Math.abs(vertScrollbar)&&(width-=vertScrollbar),1!==Math.abs(horizScrollbar)&&(height-=horizScrollbar)}return createRectInit(paddings.left,paddings.top,width,height)}function isDocumentElement(target){return target===document.documentElement}function getContentRect(target){return isBrowser?isSVGGraphicsElement(target)?getSVGContentRect(target):getHTMLElementContentRect(target):emptyRect}function createReadOnlyRect(ref){var x=ref.x,y=ref.y,width=ref.width,height=ref.height,Constr="undefined"!=typeof DOMRectReadOnly?DOMRectReadOnly:Object,rect=Object.create(Constr.prototype);return defineConfigurable(rect,{x:x,y:y,width:width,height:height,top:y,right:x+width,bottom:height+y,left:x}),rect}function createRectInit(x,y,width,height){return{x:x,y:y,width:width,height:height}}var MapShim=function(){function getIndex(arr,key){var result=-1;return arr.some(function(entry,index){return entry[0]===key&&(result=index,!0)}),result}return"undefined"!=typeof Map?Map:function(){function anonymous(){this.__entries__=[]}var prototypeAccessors={size:{}};return prototypeAccessors.size.get=function(){return this.__entries__.length},anonymous.prototype.get=function(key){var index=getIndex(this.__entries__,key),entry=this.__entries__[index];return entry&&entry[1]},anonymous.prototype.set=function(key,value){var index=getIndex(this.__entries__,key);~index?this.__entries__[index][1]=value:this.__entries__.push([key,value])},anonymous.prototype.delete=function(key){var entries=this.__entries__,index=getIndex(entries,key);~index&&entries.splice(index,1)},anonymous.prototype.has=function(key){return!!~getIndex(this.__entries__,key)},anonymous.prototype.clear=function(){this.__entries__.splice(0)},anonymous.prototype.forEach=function(callback,ctx){void 0===ctx&&(ctx=null);for(var i=0,list=this.__entries__;i<list.length;i+=1){var entry=list[i];callback.call(ctx,entry[1],entry[0])}},Object.defineProperties(anonymous.prototype,prototypeAccessors),anonymous}()}(),isBrowser="undefined"!=typeof window&&"undefined"!=typeof document&&window.document===document,requestAnimationFrame$1=function(){return"function"==typeof requestAnimationFrame?requestAnimationFrame:function(callback){return setTimeout(function(){return callback(Date.now())},1e3/60)}}(),trailingTimeout=2,throttle=function(callback,delay){function resolvePending(){leadingCall&&(leadingCall=!1,callback()),trailingCall&&proxy()}function timeoutCallback(){requestAnimationFrame$1(resolvePending)}function proxy(){var timeStamp=Date.now();if(leadingCall){if(timeStamp-lastCallTime<trailingTimeout)return;trailingCall=!0}else leadingCall=!0,trailingCall=!1,setTimeout(timeoutCallback,delay);lastCallTime=timeStamp}var leadingCall=!1,trailingCall=!1,lastCallTime=0;return proxy},REFRESH_DELAY=20,transitionKeys=["top","right","bottom","left","width","height","size","weight"],isIE11="undefined"!=typeof navigator&&/Trident\/.*rv:11/.test(navigator.userAgent),mutationObserverSupported="undefined"!=typeof MutationObserver&&!isIE11,ResizeObserverController=function(){this.connected_=!1,this.mutationEventsAdded_=!1,this.mutationsObserver_=null,this.observers_=[],this.onTransitionEnd_=this.onTransitionEnd_.bind(this),this.refresh=throttle(this.refresh.bind(this),REFRESH_DELAY)};ResizeObserverController.prototype.addObserver=function(observer){~this.observers_.indexOf(observer)||this.observers_.push(observer),this.connected_||this.connect_()},ResizeObserverController.prototype.removeObserver=function(observer){var observers=this.observers_,index=observers.indexOf(observer);~index&&observers.splice(index,1),!observers.length&&this.connected_&&this.disconnect_()},ResizeObserverController.prototype.refresh=function(){var changesDetected=this.updateObservers_();changesDetected&&this.refresh()},ResizeObserverController.prototype.updateObservers_=function(){var activeObservers=this.observers_.filter(function(observer){return observer.gatherActive(),observer.hasActive()});return activeObservers.forEach(function(observer){return observer.broadcastActive()}),activeObservers.length>0},ResizeObserverController.prototype.connect_=function(){isBrowser&&!this.connected_&&(document.addEventListener("transitionend",this.onTransitionEnd_),window.addEventListener("resize",this.refresh),mutationObserverSupported?(this.mutationsObserver_=new MutationObserver(this.refresh),this.mutationsObserver_.observe(document,{attributes:!0,childList:!0,characterData:!0,subtree:!0})):(document.addEventListener("DOMSubtreeModified",this.refresh),this.mutationEventsAdded_=!0),this.connected_=!0)},ResizeObserverController.prototype.disconnect_=function(){isBrowser&&this.connected_&&(document.removeEventListener("transitionend",this.onTransitionEnd_),window.removeEventListener("resize",this.refresh),this.mutationsObserver_&&this.mutationsObserver_.disconnect(),this.mutationEventsAdded_&&document.removeEventListener("DOMSubtreeModified",this.refresh),this.mutationsObserver_=null,this.mutationEventsAdded_=!1,this.connected_=!1)},ResizeObserverController.prototype.onTransitionEnd_=function(ref){var propertyName=ref.propertyName,isReflowProperty=transitionKeys.some(function(key){return!!~propertyName.indexOf(key)});isReflowProperty&&this.refresh()},ResizeObserverController.getInstance=function(){return this.instance_||(this.instance_=new ResizeObserverController),this.instance_},ResizeObserverController.instance_=null;var defineConfigurable=function(target,props){for(var i=0,list=Object.keys(props);i<list.length;i+=1){var key=list[i];Object.defineProperty(target,key,{value:props[key],enumerable:!1,writable:!1,configurable:!0})}return target},emptyRect=createRectInit(0,0,0,0),isSVGGraphicsElement=function(){return"undefined"!=typeof SVGGraphicsElement?function(target){return target instanceof SVGGraphicsElement}:function(target){return target instanceof SVGElement&&"function"==typeof target.getBBox}}(),ResizeObservation=function(target){this.broadcastWidth=0,this.broadcastHeight=0,this.contentRect_=createRectInit(0,0,0,0),this.target=target};ResizeObservation.prototype.isActive=function(){var rect=getContentRect(this.target);return this.contentRect_=rect,rect.width!==this.broadcastWidth||rect.height!==this.broadcastHeight},ResizeObservation.prototype.broadcastRect=function(){var rect=this.contentRect_;return this.broadcastWidth=rect.width,this.broadcastHeight=rect.height,rect};var ResizeObserverEntry=function(target,rectInit){var contentRect=createReadOnlyRect(rectInit);defineConfigurable(this,{target:target,contentRect:contentRect})},ResizeObserverSPI=function(callback,controller,callbackCtx){if("function"!=typeof callback)throw new TypeError("The callback provided as parameter 1 is not a function.");this.activeObservations_=[],this.observations_=new MapShim,this.callback_=callback,this.controller_=controller,this.callbackCtx_=callbackCtx};ResizeObserverSPI.prototype.observe=function(target){if(!arguments.length)throw new TypeError("1 argument required, but only 0 present.");if("undefined"!=typeof Element&&Element instanceof Object){if(!(target instanceof Element))throw new TypeError('parameter 1 is not of type "Element".');var observations=this.observations_;observations.has(target)||(observations.set(target,new ResizeObservation(target)),this.controller_.addObserver(this),this.controller_.refresh())}},ResizeObserverSPI.prototype.unobserve=function(target){if(!arguments.length)throw new TypeError("1 argument required, but only 0 present.");if("undefined"!=typeof Element&&Element instanceof Object){if(!(target instanceof Element))throw new TypeError('parameter 1 is not of type "Element".');var observations=this.observations_;observations.has(target)&&(observations.delete(target),observations.size||this.controller_.removeObserver(this))}},ResizeObserverSPI.prototype.disconnect=function(){this.clearActive(),this.observations_.clear(),this.controller_.removeObserver(this)},ResizeObserverSPI.prototype.gatherActive=function(){var this$1=this;this.clearActive(),this.observations_.forEach(function(observation){observation.isActive()&&this$1.activeObservations_.push(observation)})},ResizeObserverSPI.prototype.broadcastActive=function(){if(this.hasActive()){var ctx=this.callbackCtx_,entries=this.activeObservations_.map(function(observation){return new ResizeObserverEntry(observation.target,observation.broadcastRect())});this.callback_.call(ctx,entries,ctx),this.clearActive()}},ResizeObserverSPI.prototype.clearActive=function(){this.activeObservations_.splice(0)},ResizeObserverSPI.prototype.hasActive=function(){return this.activeObservations_.length>0};var observers="undefined"!=typeof WeakMap?new WeakMap:new MapShim,ResizeObserver$1=function(callback){if(!(this instanceof ResizeObserver$1))throw new TypeError("Cannot call a class as a function");if(!arguments.length)throw new TypeError("1 argument required, but only 0 present.");var controller=ResizeObserverController.getInstance(),observer=new ResizeObserverSPI(callback,controller,this);observers.set(this,observer)};["observe","unobserve","disconnect"].forEach(function(method){ResizeObserver$1.prototype[method]=function(){return(ref=observers.get(this))[method].apply(ref,arguments);var ref}});var index=function(){return"undefined"!=typeof ResizeObserver?ResizeObserver:ResizeObserver$1}();return index});