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-/*!
- * This source file is part of the Swift.org open source project
- *
- * Copyright (c) 2021 Apple Inc. and the Swift project authors
- * Licensed under Apache License v2.0 with Runtime Library Exception
- *
- * See https://swift.org/LICENSE.txt for license information
- * See https://swift.org/CONTRIBUTORS.txt for Swift project authors
- */
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e.element==t}));if(!e){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 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i=o.element,s=f(i),u=this._rootContainsTarget(i),c=o.entry,a=t&&u&&this._computeTargetAndRootIntersection(i,s,e),l=null;this._rootContainsTarget(i)?n&&!this.root||(l=e):l=p();var d=o.entry=new r({time:h(),target:i,boundingClientRect:s,rootBounds:l,intersectionRect:a});c?t&&u?this._hasCrossedThreshold(c,d)&&this._queuedEntries.push(d):c&&c.isIntersecting&&this._queuedEntries.push(d):this._queuedEntries.push(d)}),this),this._queuedEntries.length&&this._callback(this.takeRecords(),this)}},s.prototype._computeTargetAndRootIntersection=function(e,i,r){if("none"!=window.getComputedStyle(e).display){var s=i,h=v(e),u=!1;while(!u&&h){var c=null,a=1==h.nodeType?window.getComputedStyle(h):{};if("none"==a.display)return null;if(h==this.root||9==h.nodeType)if(u=!0,h==this.root||h==t)n&&!this.root?!o||0==o.width&&0==o.height?(h=null,c=null,s=null):c=o:c=r;else{var p=v(h),d=p&&f(p),m=p&&this._computeTargetAndRootIntersection(p,d,r);d&&m?(h=p,c=g(d,m)):(h=null,s=null)}else{var 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