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e=(t||"0px").split(/\s+/).map((function(t){var e=/^(-?\d*\.?\d+)(px|%)$/.exec(t);if(!e)throw new Error("rootMargin must be specified in pixels or percent");return{value:parseFloat(e[1]),unit:e[2]}}));return e[1]=e[1]||e[0],e[2]=e[2]||e[0],e[3]=e[3]||e[1],e},s.prototype._monitorIntersections=function(e){var n=e.defaultView;if(n&&-1==this._monitoringDocuments.indexOf(e)){var o=this._checkForIntersections,r=null,s=null;this.POLL_INTERVAL?r=n.setInterval(o,this.POLL_INTERVAL):(h(n,"resize",o,!0),h(e,"scroll",o,!0),this.USE_MUTATION_OBSERVER&&"MutationObserver"in n&&(s=new n.MutationObserver(o)).observe(e,{attributes:!0,childList:!0,characterData:!0,subtree:!0})),this._monitoringDocuments.push(e),this._monitoringUnsubscribes.push((function(){var t=e.defaultView;t&&(r&&t.clearInterval(r),c(t,"resize",o,!0)),c(e,"scroll",o,!0),s&&s.disconnect()}));var u=this.root&&(this.root.ownerDocument||this.root)||t;if(e!=u){var 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t=this._rootIsInDom(),e=t?this._getRootRect():{top:0,bottom:0,left:0,right:0,width:0,height:0};this._observationTargets.forEach((function(o){var i=o.element,s=u(i),h=this._rootContainsTarget(i),c=o.entry,a=t&&h&&this._computeTargetAndRootIntersection(i,s,e),l=null;this._rootContainsTarget(i)?n&&!this.root||(l=e):l={top:0,bottom:0,left:0,right:0,width:0,height:0};var f=o.entry=new r({time:window.performance&&performance.now&&performance.now(),target:i,boundingClientRect:s,rootBounds:l,intersectionRect:a});c?t&&h?this._hasCrossedThreshold(c,f)&&this._queuedEntries.push(f):c&&c.isIntersecting&&this._queuedEntries.push(f):this._queuedEntries.push(f)}),this),this._queuedEntries.length&&this._callback(this.takeRecords(),this)}},s.prototype._computeTargetAndRootIntersection=function(e,i,r){if("none"!=window.getComputedStyle(e).display){for(var s,h,c,a,f,p,g,m,v=i,_=d(e),b=!1;!b&&_;){var w=null,y=1==_.nodeType?window.getComputedStyle(_):{};if("none"==y.display)return 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this._expandRectByRootMargin(e)},s.prototype._expandRectByRootMargin=function(t){var e=this._rootMarginValues.map((function(e,n){return"px"==e.unit?e.value:e.value*(n%2?t.width:t.height)/100})),n={top:t.top-e[0],right:t.right+e[1],bottom:t.bottom+e[2],left:t.left-e[3]};return n.width=n.right-n.left,n.height=n.bottom-n.top,n},s.prototype._hasCrossedThreshold=function(t,e){var n=t&&t.isIntersecting?t.intersectionRatio||0:-1,o=e.isIntersecting?e.intersectionRatio||0:-1;if(n!==o)for(var i=0;i<this.thresholds.length;i++){var r=this.thresholds[i];if(r==n||r==o||r<n!=r<o)return!0}},s.prototype._rootIsInDom=function(){return!this.root||f(t,this.root)},s.prototype._rootContainsTarget=function(e){var n=this.root&&(this.root.ownerDocument||this.root)||t;return f(n,e)&&(!this.root||n==e.ownerDocument)},s.prototype._registerInstance=function(){e.indexOf(this)<0&&e.push(this)},s.prototype._unregisterInstance=function(){var 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