[],n=null,r=null;s.prototype.THROTTLE_TIMEOUT=100,s.prototype.POLL_INTERVAL=null,s.prototype.USE_MUTATION_OBSERVER=!0,s._setupCrossOriginUpdater=function(){return n||(n=function(t,n){r=t&&n?h(t,n):{top:0,bottom:0,left:0,right:0,width:0,height:0},e.forEach((function(t){t._checkForIntersections()}))}),n},s._resetCrossOriginUpdater=function(){n=null,r=null},s.prototype.observe=function(t){if(!this._observationTargets.some((function(e){return e.element==t}))){if(!t||1!=t.nodeType)throw new Error("target must be an Element");this._registerInstance(),this._observationTargets.push({element:t,entry:null}),this._monitorIntersections(t.ownerDocument),this._checkForIntersections()}},s.prototype.unobserve=function(t){this._observationTargets=this._observationTargets.filter((function(e){return e.element!=t})),this._unmonitorIntersections(t.ownerDocument),0==this._observationTargets.length&&this._unregisterInstance()},s.prototype.disconnect=function(){this._observationTargets=[],this._unmonitorAllIntersections(),this._unregisterInstance()},s.prototype.takeRecords=function(){var t=this._queuedEntries.slice();return this._queuedEntries=[],t},s.prototype._initThresholds=function(t){var e=t||[0];return Array.isArray(e)||(e=[e]),e.sort().filter((function(t,e,n){if("number"!=typeof t||isNaN(t)||t<0||t>1)throw new Error("threshold must be a number between 0 and 1 inclusively");return t!==n[e-1]}))},s.prototype._parseRootMargin=function(t){var 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 r=this._checkForIntersections,i=null,s=null;this.POLL_INTERVAL?i=n.setInterval(r,this.POLL_INTERVAL):(c(n,"resize",r,!0),c(e,"scroll",r,!0),this.USE_MUTATION_OBSERVER&&"MutationObserver"in n&&(s=new n.MutationObserver(r)).observe(e,{attributes:!0,childList:!0,characterData:!0,subtree:!0})),this._monitoringDocuments.push(e),this._monitoringUnsubscribes.push((function(){var t=e.defaultView;t&&(i&&t.clearInterval(i),u(t,"resize",r,!0)),u(e,"scroll",r,!0),s&&s.disconnect()}));var a=this.root&&(this.root.ownerDocument||this.root)||t;if(e!=a){var f=o(e);f&&this._monitorIntersections(f.ownerDocument)}}},s.prototype._unmonitorIntersections=function(e){var n=this._monitoringDocuments.indexOf(e);if(-1!=n){var r=this.root&&(this.root.ownerDocument||this.root)||t;if(!this._observationTargets.some((function(t){var n=t.element.ownerDocument;if(n==e)return!0;for(;n&&n!=r;){var i=o(n);if((n=i&&i.ownerDocument)==e)return!0}return!1}))){var i=this._monitoringUnsubscribes[n];if(this._monitoringDocuments.splice(n,1),this._monitoringUnsubscribes.splice(n,1),i(),e!=r){var s=o(e);s&&this._unmonitorIntersections(s.ownerDocument)}}}},s.prototype._unmonitorAllIntersections=function(){var t=this._monitoringUnsubscribes.slice(0);this._monitoringDocuments.length=0,this._monitoringUnsubscribes.length=0;for(var e=0;e<t.length;e++)t[e]()},s.prototype._checkForIntersections=function(){if(this.root||!n||r){var t=this._rootIsInDom(),e=t?this._getRootRect():{top:0,bottom:0,left:0,right:0,width:0,height:0};this._observationTargets.forEach((function(r){var o=r.element,s=a(o),c=this._rootContainsTarget(o),u=r.entry,f=t&&c&&this._computeTargetAndRootIntersection(o,s,e),h=null;this._rootContainsTarget(o)?n&&!this.root||(h=e):h={top:0,bottom:0,left:0,right:0,width:0,height:0};var l=r.entry=new i({time:window.performance&&performance.now&&performance.now(),target:o,
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[],n=null,r=null;s.prototype.THROTTLE_TIMEOUT=100,s.prototype.POLL_INTERVAL=null,s.prototype.USE_MUTATION_OBSERVER=!0,s._setupCrossOriginUpdater=function(){return n||(n=function(t,n){r=t&&n?h(t,n):{top:0,bottom:0,left:0,right:0,width:0,height:0},e.forEach((function(t){t._checkForIntersections()}))}),n},s._resetCrossOriginUpdater=function(){n=null,r=null},s.prototype.observe=function(t){if(!this._observationTargets.some((function(e){return e.element==t}))){if(!t||1!=t.nodeType)throw new Error("target must be an Element");this._registerInstance(),this._observationTargets.push({element:t,entry:null}),this._monitorIntersections(t.ownerDocument),this._checkForIntersections()}},s.prototype.unobserve=function(t){this._observationTargets=this._observationTargets.filter((function(e){return e.element!=t})),this._unmonitorIntersections(t.ownerDocument),0==this._observationTargets.length&&this._unregisterInstance()},s.prototype.disconnect=function(){this._observationTargets=[],this._unmonitorAllIntersections(),this._unregisterInstance()},s.prototype.takeRecords=function(){var t=this._queuedEntries.slice();return this._queuedEntries=[],t},s.prototype._initThresholds=function(t){var e=t||[0];return Array.isArray(e)||(e=[e]),e.sort().filter((function(t,e,n){if("number"!=typeof t||isNaN(t)||t<0||t>1)throw new Error("threshold must be a number between 0 and 1 inclusively");return t!==n[e-1]}))},s.prototype._parseRootMargin=function(t){var 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 r=this._checkForIntersections,i=null,s=null;this.POLL_INTERVAL?i=n.setInterval(r,this.POLL_INTERVAL):(c(n,"resize",r,!0),c(e,"scroll",r,!0),this.USE_MUTATION_OBSERVER&&"MutationObserver"in n&&(s=new n.MutationObserver(r)).observe(e,{attributes:!0,childList:!0,characterData:!0,subtree:!0})),this._monitoringDocuments.push(e),this._monitoringUnsubscribes.push((function(){var t=e.defaultView;t&&(i&&t.clearInterval(i),u(t,"resize",r,!0)),u(e,"scroll",r,!0),s&&s.disconnect()}));var a=this.root&&(this.root.ownerDocument||this.root)||t;if(e!=a){var f=o(e);f&&this._monitorIntersections(f.ownerDocument)}}},s.prototype._unmonitorIntersections=function(e){var n=this._monitoringDocuments.indexOf(e);if(-1!=n){var r=this.root&&(this.root.ownerDocument||this.root)||t;if(!this._observationTargets.some((function(t){var n=t.element.ownerDocument;if(n==e)return!0;for(;n&&n!=r;){var i=o(n);if((n=i&&i.ownerDocument)==e)return!0}return!1}))){var i=this._monitoringUnsubscribes[n];if(this._monitoringDocuments.splice(n,1),this._monitoringUnsubscribes.splice(n,1),i(),e!=r){var s=o(e);s&&this._unmonitorIntersections(s.ownerDocument)}}}},s.prototype._unmonitorAllIntersections=function(){var t=this._monitoringUnsubscribes.slice(0);this._monitoringDocuments.length=0,this._monitoringUnsubscribes.length=0;for(var e=0;e<t.length;e++)t[e]()},s.prototype._checkForIntersections=function(){if(this.root||!n||r){var t=this._rootIsInDom(),e=t?this._getRootRect():{top:0,bottom:0,left:0,right:0,width:0,height:0};this._observationTargets.forEach((function(r){var o=r.element,s=a(o),c=this._rootContainsTarget(o),u=r.entry,f=t&&c&&this._computeTargetAndRootIntersection(o,s,e),h=null;this._rootContainsTarget(o)?n&&!this.root||(h=e):h={top:0,bottom:0,left:0,right:0,width:0,height:0};var l=r.entry=new i({time:window.performance&&performance.now&&performance.now(),target:o,
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