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* @license\n * Copyright (c) 2018 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function () {\n  'use strict';\n\n  /**\n   * Basic flow of the loader process\n   *\n   * There are 4 flows the loader can take when booting up\n   *\n   * - Synchronous script, no polyfills needed\n   *   - wait for `DOMContentLoaded`\n   *   - fire WCR event, as there could not be any callbacks passed to `waitFor`\n   *\n   * - Synchronous script, polyfills needed\n   *   - document.write the polyfill bundle\n   *   - wait on the `load` event of the bundle to batch Custom Element upgrades\n   *   - wait for `DOMContentLoaded`\n   *   - run callbacks passed to `waitFor`\n   *   - fire WCR event\n   *\n   * - Asynchronous script, no polyfills needed\n   *   - wait for `DOMContentLoaded`\n   *   - run callbacks passed to `waitFor`\n   *   - fire WCR event\n   *\n   * - Asynchronous script, polyfills needed\n   *   - Append the polyfill bundle script\n   *   - wait for `load` event of the bundle\n   *   - batch Custom Element Upgrades\n   *   - run callbacks pass to `waitFor`\n   *   - fire WCR event\n   */\n\n  var polyfillsLoaded = false;\n  var whenLoadedFns = [];\n  var allowUpgrades = false;\n  var flushFn;\n\n  function fireEvent() {\n    window.WebComponents.ready = true;\n    document.dispatchEvent(\n      new CustomEvent('WebComponentsReady', {bubbles: true})\n    );\n  }\n\n  function batchCustomElements() {\n    if (window.customElements && customElements.polyfillWrapFlushCallback) {\n      customElements.polyfillWrapFlushCallback(function (flushCallback) {\n        flushFn = flushCallback;\n        if (allowUpgrades) {\n          flushFn();\n        }\n      });\n    }\n  }\n\n  function asyncReady() {\n    batchCustomElements();\n    ready();\n  }\n\n  function ready() {\n    // bootstrap <template> elements before custom elements\n    if (window.HTMLTemplateElement && HTMLTemplateElement.bootstrap) {\n      HTMLTemplateElement.bootstrap(window.document);\n    }\n    polyfillsLoaded = true;\n    runWhenLoadedFns().then(fireEvent);\n  }\n\n  function runWhenLoadedFns() {\n    allowUpgrades = false;\n    var fnsMap = whenLoadedFns.map(function (fn) {\n      return fn instanceof Function ? fn() : fn;\n    });\n    whenLoadedFns = [];\n    return Promise.all(fnsMap)\n      .then(function () {\n        allowUpgrades = true;\n        flushFn && flushFn();\n      })\n      .catch(function (err) {\n        console.error(err);\n      });\n  }\n\n  window.WebComponents = window.WebComponents || {};\n  window.WebComponents.ready = window.WebComponents.ready || false;\n  window.WebComponents.waitFor =\n    window.WebComponents.waitFor ||\n    function (waitFn) {\n      if (!waitFn) {\n        return;\n      }\n      whenLoadedFns.push(waitFn);\n      if (polyfillsLoaded) {\n        runWhenLoadedFns();\n      }\n    };\n  window.WebComponents._batchCustomElements = batchCustomElements;\n\n  var name = 'webcomponents-loader.js';\n  // Feature detect which polyfill needs to be imported.\n  var polyfills = [];\n  if (\n    !(\n      'attachShadow' in Element.prototype && 'getRootNode' in Element.prototype\n    ) ||\n    (window.ShadyDOM && window.ShadyDOM.force)\n  ) {\n    polyfills.push('sd');\n  }\n  if (!window.customElements || window.customElements.forcePolyfill) {\n    polyfills.push('ce');\n  }\n\n  var needsTemplate = (function () {\n    // no real <template> because no `content` property (IE and older browsers)\n    var t = document.createElement('template');\n    if (!('content' in t)) {\n      return true;\n    }\n    // broken doc fragment (older Edge)\n    if (!(t.content.cloneNode() instanceof DocumentFragment)) {\n      return true;\n    }\n    // broken <template> cloning (Edge up to at least version 17)\n    var t2 = document.createElement('template');\n    t2.content.appendChild(document.createElement('div'));\n    t.content.appendChild(t2);\n    var clone = t.cloneNode(true);\n    return (\n      clone.content.childNodes.length === 0 ||\n      clone.content.firstChild.content.childNodes.length === 0\n    );\n  })();\n\n  // NOTE: any browser that does not have template or ES6 features\n  // must load the full suite of polyfills.\n  if (\n    !window.Promise ||\n    !Array.from ||\n    !window.URL ||\n    !window.Symbol ||\n    needsTemplate\n  ) {\n    polyfills = ['sd-ce-pf'];\n  }\n\n  if (polyfills.length) {\n    var url;\n    var polyfillFile = 'bundles/webcomponents-' + polyfills.join('-') + '.js';\n\n    // Load it from the right place.\n    if (window.WebComponents.root) {\n      url = window.WebComponents.root + polyfillFile;\n    } else {\n      var script = document.querySelector('script[src*=\"' + name + '\"]');\n      // Load it from the right place.\n      url = script.src.replace(name, polyfillFile);\n    }\n\n    var newScript = document.createElement('script');\n    newScript.src = url;\n    // if readyState is 'loading', this script is synchronous\n    if (document.readyState === 'loading') {\n      // make sure custom elements are batched whenever parser gets to the injected script\n      newScript.setAttribute(\n        'onload',\n        'window.WebComponents._batchCustomElements()'\n      );\n      document.write(newScript.outerHTML);\n      document.addEventListener('DOMContentLoaded', ready);\n    } else {\n      newScript.addEventListener('load', function () {\n        asyncReady();\n      });\n      newScript.addEventListener('error', function () {\n        throw new Error('Could not load polyfill bundle' + url);\n      });\n      document.head.appendChild(newScript);\n    }\n  } else {\n    // if readyState is 'complete', script is loaded imperatively on a spec-compliant browser, so just fire WCR\n    if (document.readyState === 'complete') {\n      polyfillsLoaded = true;\n      fireEvent();\n    } else {\n      // this script may come between DCL and load, so listen for both, and cancel load listener if DCL fires\n      window.addEventListener('load', ready);\n      window.addEventListener('DOMContentLoaded', function () {\n        window.removeEventListener('load', ready);\n        ready();\n      });\n    }\n  }\n})();\n","/**\n * Copyright 2016 Google Inc. All Rights Reserved.\n *\n * Licensed under the W3C SOFTWARE AND DOCUMENT NOTICE AND LICENSE.\n *\n *  https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document\n *\n */\n(function() {\n'use strict';\n\n// Exit early if we're not running in a browser.\nif (typeof window !== 'object') {\n  return;\n}\n\n// Exit early if all IntersectionObserver and IntersectionObserverEntry\n// features are natively supported.\nif ('IntersectionObserver' in window &&\n    'IntersectionObserverEntry' in window &&\n    'intersectionRatio' in window.IntersectionObserverEntry.prototype) {\n\n  // Minimal polyfill for Edge 15's lack of `isIntersecting`\n  // See: https://github.com/w3c/IntersectionObserver/issues/211\n  if (!('isIntersecting' in window.IntersectionObserverEntry.prototype)) {\n    Object.defineProperty(window.IntersectionObserverEntry.prototype,\n      'isIntersecting', {\n      get: function () {\n        return this.intersectionRatio > 0;\n      }\n    });\n  }\n  return;\n}\n\n/**\n * Returns the embedding frame element, if any.\n * @param {!Document} doc\n * @return {!Element}\n */\nfunction getFrameElement(doc) {\n  try {\n    return doc.defaultView && doc.defaultView.frameElement || null;\n  } catch (e) {\n    // Ignore the error.\n    return null;\n  }\n}\n\n/**\n * A local reference to the root document.\n */\nvar document = (function(startDoc) {\n  var doc = startDoc;\n  var frame = getFrameElement(doc);\n  while (frame) {\n    doc = frame.ownerDocument;\n    frame = getFrameElement(doc);\n  }\n  return doc;\n})(window.document);\n\n/**\n * An IntersectionObserver registry. This registry exists to hold a strong\n * reference to IntersectionObserver instances currently observing a target\n * element. Without this registry, instances without another reference may be\n * garbage collected.\n */\nvar registry = [];\n\n/**\n * The signal updater for cross-origin intersection. When not null, it means\n * that the polyfill is configured to work in a cross-origin mode.\n * @type {function(DOMRect|ClientRect, DOMRect|ClientRect)}\n */\nvar crossOriginUpdater = null;\n\n/**\n * The current cross-origin intersection. Only used in the cross-origin mode.\n * @type {DOMRect|ClientRect}\n */\nvar crossOriginRect = null;\n\n\n/**\n * Creates the global IntersectionObserverEntry constructor.\n * https://w3c.github.io/IntersectionObserver/#intersection-observer-entry\n * @param {Object} entry A dictionary of instance properties.\n * @constructor\n */\nfunction IntersectionObserverEntry(entry) {\n  this.time = entry.time;\n  this.target = entry.target;\n  this.rootBounds = ensureDOMRect(entry.rootBounds);\n  this.boundingClientRect = ensureDOMRect(entry.boundingClientRect);\n  this.intersectionRect = ensureDOMRect(entry.intersectionRect || getEmptyRect());\n  this.isIntersecting = !!entry.intersectionRect;\n\n  // Calculates the intersection ratio.\n  var targetRect = this.boundingClientRect;\n  var targetArea = targetRect.width * targetRect.height;\n  var intersectionRect = this.intersectionRect;\n  var intersectionArea = intersectionRect.width * intersectionRect.height;\n\n  // Sets intersection ratio.\n  if (targetArea) {\n    // Round the intersection ratio to avoid floating point math issues:\n    // https://github.com/w3c/IntersectionObserver/issues/324\n    this.intersectionRatio = Number((intersectionArea / targetArea).toFixed(4));\n  } else {\n    // If area is zero and is intersecting, sets to 1, otherwise to 0\n    this.intersectionRatio = this.isIntersecting ? 1 : 0;\n  }\n}\n\n\n/**\n * Creates the global IntersectionObserver constructor.\n * https://w3c.github.io/IntersectionObserver/#intersection-observer-interface\n * @param {Function} callback The function to be invoked after intersection\n *     changes have queued. The function is not invoked if the queue has\n *     been emptied by calling the `takeRecords` method.\n * @param {Object=} opt_options Optional configuration options.\n * @constructor\n */\nfunction IntersectionObserver(callback, opt_options) {\n\n  var options = opt_options || {};\n\n  if (typeof callback != 'function') {\n    throw new Error('callback must be a function');\n  }\n\n  if (\n    options.root &&\n    options.root.nodeType != 1 &&\n    options.root.nodeType != 9\n  ) {\n    throw new Error('root must be a Document or Element');\n  }\n\n  // Binds and throttles `this._checkForIntersections`.\n  this._checkForIntersections = throttle(\n      this._checkForIntersections.bind(this), this.THROTTLE_TIMEOUT);\n\n  // Private properties.\n  this._callback = callback;\n  this._observationTargets = [];\n  this._queuedEntries = [];\n  this._rootMarginValues = this._parseRootMargin(options.rootMargin);\n\n  // Public properties.\n  this.thresholds = this._initThresholds(options.threshold);\n  this.root = options.root || null;\n  this.rootMargin = this._rootMarginValues.map(function(margin) {\n    return margin.value + margin.unit;\n  }).join(' ');\n\n  /** @private @const {!Array<!Document>} */\n  this._monitoringDocuments = [];\n  /** @private @const {!Array<function()>} */\n  this._monitoringUnsubscribes = [];\n}\n\n\n/**\n * The minimum interval within which the document will be checked for\n * intersection changes.\n */\nIntersectionObserver.prototype.THROTTLE_TIMEOUT = 100;\n\n\n/**\n * The frequency in which the polyfill polls for intersection changes.\n * this can be updated on a per instance basis and must be set prior to\n * calling `observe` on the first target.\n */\nIntersectionObserver.prototype.POLL_INTERVAL = null;\n\n/**\n * Use a mutation observer on the root element\n * to detect intersection changes.\n */\nIntersectionObserver.prototype.USE_MUTATION_OBSERVER = true;\n\n\n/**\n * Sets up the polyfill in the cross-origin mode. The result is the\n * updater function that accepts two arguments: `boundingClientRect` and\n * `intersectionRect` - just as these fields would be available to the\n * parent via `IntersectionObserverEntry`. This function should be called\n * each time the iframe receives intersection information from the parent\n * window, e.g. via messaging.\n * @return {function(DOMRect|ClientRect, DOMRect|ClientRect)}\n */\nIntersectionObserver._setupCrossOriginUpdater = function() {\n  if (!crossOriginUpdater) {\n    /**\n     * @param {DOMRect|ClientRect} boundingClientRect\n     * @param {DOMRect|ClientRect} intersectionRect\n     */\n    crossOriginUpdater = function(boundingClientRect, intersectionRect) {\n      if (!boundingClientRect || !intersectionRect) {\n        crossOriginRect = getEmptyRect();\n      } else {\n        crossOriginRect = convertFromParentRect(boundingClientRect, intersectionRect);\n      }\n      registry.forEach(function(observer) {\n        observer._checkForIntersections();\n      });\n    };\n  }\n  return crossOriginUpdater;\n};\n\n\n/**\n * Resets the cross-origin mode.\n */\nIntersectionObserver._resetCrossOriginUpdater = function() {\n  crossOriginUpdater = null;\n  crossOriginRect = null;\n};\n\n\n/**\n * Starts observing a target element for intersection changes based on\n * the thresholds values.\n * @param {Element} target The DOM element to observe.\n */\nIntersectionObserver.prototype.observe = function(target) {\n  var isTargetAlreadyObserved = this._observationTargets.some(function(item) {\n    return item.element == target;\n  });\n\n  if (isTargetAlreadyObserved) {\n    return;\n  }\n\n  if (!(target && target.nodeType == 1)) {\n    throw new Error('target must be an Element');\n  }\n\n  this._registerInstance();\n  this._observationTargets.push({element: target, entry: null});\n  this._monitorIntersections(target.ownerDocument);\n  this._checkForIntersections();\n};\n\n\n/**\n * Stops observing a target element for intersection changes.\n * @param {Element} target The DOM element to observe.\n */\nIntersectionObserver.prototype.unobserve = function(target) {\n  this._observationTargets =\n      this._observationTargets.filter(function(item) {\n        return item.element != target;\n      });\n  this._unmonitorIntersections(target.ownerDocument);\n  if (this._observationTargets.length == 0) {\n    this._unregisterInstance();\n  }\n};\n\n\n/**\n * Stops observing all target elements for intersection changes.\n */\nIntersectionObserver.prototype.disconnect = function() {\n  this._observationTargets = [];\n  this._unmonitorAllIntersections();\n  this._unregisterInstance();\n};\n\n\n/**\n * Returns any queue entries that have not yet been reported to the\n * callback and clears the queue. This can be used in conjunction with the\n * callback to obtain the absolute most up-to-date intersection information.\n * @return {Array} The currently queued entries.\n */\nIntersectionObserver.prototype.takeRecords = function() {\n  var records = this._queuedEntries.slice();\n  this._queuedEntries = [];\n  return records;\n};\n\n\n/**\n * Accepts the threshold value from the user configuration object and\n * returns a sorted array of unique threshold values. If a value is not\n * between 0 and 1 and error is thrown.\n * @private\n * @param {Array|number=} opt_threshold An optional threshold value or\n *     a list of threshold values, defaulting to [0].\n * @return {Array} A sorted list of unique and valid threshold values.\n */\nIntersectionObserver.prototype._initThresholds = function(opt_threshold) {\n  var threshold = opt_threshold || [0];\n  if (!Array.isArray(threshold)) threshold = [threshold];\n\n  return threshold.sort().filter(function(t, i, a) {\n    if (typeof t != 'number' || isNaN(t) || t < 0 || t > 1) {\n      throw new Error('threshold must be a number between 0 and 1 inclusively');\n    }\n    return t !== a[i - 1];\n  });\n};\n\n\n/**\n * Accepts the rootMargin value from the user configuration object\n * and returns an array of the four margin values as an object containing\n * the value and unit properties. If any of the values are not properly\n * formatted or use a unit other than px or %, and error is thrown.\n * @private\n * @param {string=} opt_rootMargin An optional rootMargin value,\n *     defaulting to '0px'.\n * @return {Array<Object>} An array of margin objects with the keys\n *     value and unit.\n */\nIntersectionObserver.prototype._parseRootMargin = function(opt_rootMargin) {\n  var marginString = opt_rootMargin || '0px';\n  var margins = marginString.split(/\\s+/).map(function(margin) {\n    var parts = /^(-?\\d*\\.?\\d+)(px|%)$/.exec(margin);\n    if (!parts) {\n      throw new Error('rootMargin must be specified in pixels or percent');\n    }\n    return {value: parseFloat(parts[1]), unit: parts[2]};\n  });\n\n  // Handles shorthand.\n  margins[1] = margins[1] || margins[0];\n  margins[2] = margins[2] || margins[0];\n  margins[3] = margins[3] || margins[1];\n\n  return margins;\n};\n\n\n/**\n * Starts polling for intersection changes if the polling is not already\n * happening, and if the page's visibility state is visible.\n * @param {!Document} doc\n * @private\n */\nIntersectionObserver.prototype._monitorIntersections = function(doc) {\n  var win = doc.defaultView;\n  if (!win) {\n    // Already destroyed.\n    return;\n  }\n  if (this._monitoringDocuments.indexOf(doc) != -1) {\n    // Already monitoring.\n    return;\n  }\n\n  // Private state for monitoring.\n  var callback = this._checkForIntersections;\n  var monitoringInterval = null;\n  var domObserver = null;\n\n  // If a poll interval is set, use polling instead of listening to\n  // resize and scroll events or DOM mutations.\n  if (this.POLL_INTERVAL) {\n    monitoringInterval = win.setInterval(callback, this.POLL_INTERVAL);\n  } else {\n    addEvent(win, 'resize', callback, true);\n    addEvent(doc, 'scroll', callback, true);\n    if (this.USE_MUTATION_OBSERVER && 'MutationObserver' in win) {\n      domObserver = new win.MutationObserver(callback);\n      domObserver.observe(doc, {\n        attributes: true,\n        childList: true,\n        characterData: true,\n        subtree: true\n      });\n    }\n  }\n\n  this._monitoringDocuments.push(doc);\n  this._monitoringUnsubscribes.push(function() {\n    // Get the window object again. When a friendly iframe is destroyed, it\n    // will be null.\n    var win = doc.defaultView;\n\n    if (win) {\n      if (monitoringInterval) {\n        win.clearInterval(monitoringInterval);\n      }\n      removeEvent(win, 'resize', callback, true);\n    }\n\n    removeEvent(doc, 'scroll', callback, true);\n    if (domObserver) {\n      domObserver.disconnect();\n    }\n  });\n\n  // Also monitor the parent.\n  var rootDoc =\n    (this.root && (this.root.ownerDocument || this.root)) || document;\n  if (doc != rootDoc) {\n    var frame = getFrameElement(doc);\n    if (frame) {\n      this._monitorIntersections(frame.ownerDocument);\n    }\n  }\n};\n\n\n/**\n * Stops polling for intersection changes.\n * @param {!Document} doc\n * @private\n */\nIntersectionObserver.prototype._unmonitorIntersections = function(doc) {\n  var index = this._monitoringDocuments.indexOf(doc);\n  if (index == -1) {\n    return;\n  }\n\n  var rootDoc =\n    (this.root && (this.root.ownerDocument || this.root)) || document;\n\n  // Check if any dependent targets are still remaining.\n  var hasDependentTargets =\n      this._observationTargets.some(function(item) {\n        var itemDoc = item.element.ownerDocument;\n        // Target is in this context.\n        if (itemDoc == doc) {\n          return true;\n        }\n        // Target is nested in this context.\n        while (itemDoc && itemDoc != rootDoc) {\n          var frame = getFrameElement(itemDoc);\n          itemDoc = frame && frame.ownerDocument;\n          if (itemDoc == doc) {\n            return true;\n          }\n        }\n        return false;\n      });\n  if (hasDependentTargets) {\n    return;\n  }\n\n  // Unsubscribe.\n  var unsubscribe = this._monitoringUnsubscribes[index];\n  this._monitoringDocuments.splice(index, 1);\n  this._monitoringUnsubscribes.splice(index, 1);\n  unsubscribe();\n\n  // Also unmonitor the parent.\n  if (doc != rootDoc) {\n    var frame = getFrameElement(doc);\n    if (frame) {\n      this._unmonitorIntersections(frame.ownerDocument);\n    }\n  }\n};\n\n\n/**\n * Stops polling for intersection changes.\n * @param {!Document} doc\n * @private\n */\nIntersectionObserver.prototype._unmonitorAllIntersections = function() {\n  var unsubscribes = this._monitoringUnsubscribes.slice(0);\n  this._monitoringDocuments.length = 0;\n  this._monitoringUnsubscribes.length = 0;\n  for (var i = 0; i < unsubscribes.length; i++) {\n    unsubscribes[i]();\n  }\n};\n\n\n/**\n * Scans each observation target for intersection changes and adds them\n * to the internal entries queue. If new entries are found, it\n * schedules the callback to be invoked.\n * @private\n */\nIntersectionObserver.prototype._checkForIntersections = function() {\n  if (!this.root && crossOriginUpdater && !crossOriginRect) {\n    // Cross origin monitoring, but no initial data available yet.\n    return;\n  }\n\n  var rootIsInDom = this._rootIsInDom();\n  var rootRect = rootIsInDom ? this._getRootRect() : getEmptyRect();\n\n  this._observationTargets.forEach(function(item) {\n    var target = item.element;\n    var targetRect = getBoundingClientRect(target);\n    var rootContainsTarget = this._rootContainsTarget(target);\n    var oldEntry = item.entry;\n    var intersectionRect = rootIsInDom && rootContainsTarget &&\n        this._computeTargetAndRootIntersection(target, targetRect, rootRect);\n\n    var rootBounds = null;\n    if (!this._rootContainsTarget(target)) {\n      rootBounds = getEmptyRect();\n    } else if (!crossOriginUpdater || this.root) {\n      rootBounds = rootRect;\n    }\n\n    var newEntry = item.entry = new IntersectionObserverEntry({\n      time: now(),\n      target: target,\n      boundingClientRect: targetRect,\n      rootBounds: rootBounds,\n      intersectionRect: intersectionRect\n    });\n\n    if (!oldEntry) {\n      this._queuedEntries.push(newEntry);\n    } else if (rootIsInDom && rootContainsTarget) {\n      // If the new entry intersection ratio has crossed any of the\n      // thresholds, add a new entry.\n      if (this._hasCrossedThreshold(oldEntry, newEntry)) {\n        this._queuedEntries.push(newEntry);\n      }\n    } else {\n      // If the root is not in the DOM or target is not contained within\n      // root but the previous entry for this target had an intersection,\n      // add a new record indicating removal.\n      if (oldEntry && oldEntry.isIntersecting) {\n        this._queuedEntries.push(newEntry);\n      }\n    }\n  }, this);\n\n  if (this._queuedEntries.length) {\n    this._callback(this.takeRecords(), this);\n  }\n};\n\n\n/**\n * Accepts a target and root rect computes the intersection between then\n * following the algorithm in the spec.\n * TODO(philipwalton): at this time clip-path is not considered.\n * https://w3c.github.io/IntersectionObserver/#calculate-intersection-rect-algo\n * @param {Element} target The target DOM element\n * @param {Object} targetRect The bounding rect of the target.\n * @param {Object} rootRect The bounding rect of the root after being\n *     expanded by the rootMargin value.\n * @return {?Object} The final intersection rect object or undefined if no\n *     intersection is found.\n * @private\n */\nIntersectionObserver.prototype._computeTargetAndRootIntersection =\n    function(target, targetRect, rootRect) {\n  // If the element isn't displayed, an intersection can't happen.\n  if (window.getComputedStyle(target).display == 'none') return;\n\n  var intersectionRect = targetRect;\n  var parent = getParentNode(target);\n  var atRoot = false;\n\n  while (!atRoot && parent) {\n    var parentRect = null;\n    var parentComputedStyle = parent.nodeType == 1 ?\n        window.getComputedStyle(parent) : {};\n\n    // If the parent isn't displayed, an intersection can't happen.\n    if (parentComputedStyle.display == 'none') return null;\n\n    if (parent == this.root || parent.nodeType == /* DOCUMENT */ 9) {\n      atRoot = true;\n      if (parent == this.root || parent == document) {\n        if (crossOriginUpdater && !this.root) {\n          if (!crossOriginRect ||\n              crossOriginRect.width == 0 && crossOriginRect.height == 0) {\n            // A 0-size cross-origin intersection means no-intersection.\n            parent = null;\n            parentRect = null;\n            intersectionRect = null;\n          } else {\n            parentRect = crossOriginRect;\n          }\n        } else {\n          parentRect = rootRect;\n        }\n      } else {\n        // Check if there's a frame that can be navigated to.\n        var frame = getParentNode(parent);\n        var frameRect = frame && getBoundingClientRect(frame);\n        var frameIntersect =\n            frame &&\n            this._computeTargetAndRootIntersection(frame, frameRect, rootRect);\n        if (frameRect && frameIntersect) {\n          parent = frame;\n          parentRect = convertFromParentRect(frameRect, frameIntersect);\n        } else {\n          parent = null;\n          intersectionRect = null;\n        }\n      }\n    } else {\n      // If the element has a non-visible overflow, and it's not the <body>\n      // or <html> element, update the intersection rect.\n      // Note: <body> and <html> cannot be clipped to a rect that's not also\n      // the document rect, so no need to compute a new intersection.\n      var doc = parent.ownerDocument;\n      if (parent != doc.body &&\n          parent != doc.documentElement &&\n          parentComputedStyle.overflow != 'visible') {\n        parentRect = getBoundingClientRect(parent);\n      }\n    }\n\n    // If either of the above conditionals set a new parentRect,\n    // calculate new intersection data.\n    if (parentRect) {\n      intersectionRect = computeRectIntersection(parentRect, intersectionRect);\n    }\n    if (!intersectionRect) break;\n    parent = parent && getParentNode(parent);\n  }\n  return intersectionRect;\n};\n\n\n/**\n * Returns the root rect after being expanded by the rootMargin value.\n * @return {ClientRect} The expanded root rect.\n * @private\n */\nIntersectionObserver.prototype._getRootRect = function() {\n  var rootRect;\n  if (this.root && !isDoc(this.root)) {\n    rootRect = getBoundingClientRect(this.root);\n  } else {\n    // Use <html>/<body> instead of window since scroll bars affect size.\n    var doc = isDoc(this.root) ? this.root : document;\n    var html = doc.documentElement;\n    var body = doc.body;\n    rootRect = {\n      top: 0,\n      left: 0,\n      right: html.clientWidth || body.clientWidth,\n      width: html.clientWidth || body.clientWidth,\n      bottom: html.clientHeight || body.clientHeight,\n      height: html.clientHeight || body.clientHeight\n    };\n  }\n  return this._expandRectByRootMargin(rootRect);\n};\n\n\n/**\n * Accepts a rect and expands it by the rootMargin value.\n * @param {DOMRect|ClientRect} rect The rect object to expand.\n * @return {ClientRect} The expanded rect.\n * @private\n */\nIntersectionObserver.prototype._expandRectByRootMargin = function(rect) {\n  var margins = this._rootMarginValues.map(function(margin, i) {\n    return margin.unit == 'px' ? margin.value :\n        margin.value * (i % 2 ? rect.width : rect.height) / 100;\n  });\n  var newRect = {\n    top: rect.top - margins[0],\n    right: rect.right + margins[1],\n    bottom: rect.bottom + margins[2],\n    left: rect.left - margins[3]\n  };\n  newRect.width = newRect.right - newRect.left;\n  newRect.height = newRect.bottom - newRect.top;\n\n  return newRect;\n};\n\n\n/**\n * Accepts an old and new entry and returns true if at least one of the\n * threshold values has been crossed.\n * @param {?IntersectionObserverEntry} oldEntry The previous entry for a\n *    particular target element or null if no previous entry exists.\n * @param {IntersectionObserverEntry} newEntry The current entry for a\n *    particular target element.\n * @return {boolean} Returns true if a any threshold has been crossed.\n * @private\n */\nIntersectionObserver.prototype._hasCrossedThreshold =\n    function(oldEntry, newEntry) {\n\n  // To make comparing easier, an entry that has a ratio of 0\n  // but does not actually intersect is given a value of -1\n  var oldRatio = oldEntry && oldEntry.isIntersecting ?\n      oldEntry.intersectionRatio || 0 : -1;\n  var newRatio = newEntry.isIntersecting ?\n      newEntry.intersectionRatio || 0 : -1;\n\n  // Ignore unchanged ratios\n  if (oldRatio === newRatio) return;\n\n  for (var i = 0; i < this.thresholds.length; i++) {\n    var threshold = this.thresholds[i];\n\n    // Return true if an entry matches a threshold or if the new ratio\n    // and the old ratio are on the opposite sides of a threshold.\n    if (threshold == oldRatio || threshold == newRatio ||\n        threshold < oldRatio !== threshold < newRatio) {\n      return true;\n    }\n  }\n};\n\n\n/**\n * Returns whether or not the root element is an element and is in the DOM.\n * @return {boolean} True if the root element is an element and is in the DOM.\n * @private\n */\nIntersectionObserver.prototype._rootIsInDom = function() {\n  return !this.root || containsDeep(document, this.root);\n};\n\n\n/**\n * Returns whether or not the target element is a child of root.\n * @param {Element} target The target element to check.\n * @return {boolean} True if the target element is a child of root.\n * @private\n */\nIntersectionObserver.prototype._rootContainsTarget = function(target) {\n  var rootDoc =\n    (this.root && (this.root.ownerDocument || this.root)) || document;\n  return (\n    containsDeep(rootDoc, target) &&\n    (!this.root || rootDoc == target.ownerDocument)\n  );\n};\n\n\n/**\n * Adds the instance to the global IntersectionObserver registry if it isn't\n * already present.\n * @private\n */\nIntersectionObserver.prototype._registerInstance = function() {\n  if (registry.indexOf(this) < 0) {\n    registry.push(this);\n  }\n};\n\n\n/**\n * Removes the instance from the global IntersectionObserver registry.\n * @private\n */\nIntersectionObserver.prototype._unregisterInstance = function() {\n  var index = registry.indexOf(this);\n  if (index != -1) registry.splice(index, 1);\n};\n\n\n/**\n * Returns the result of the performance.now() method or null in browsers\n * that don't support the API.\n * @return {number} The elapsed time since the page was requested.\n */\nfunction now() {\n  return window.performance && performance.now && performance.now();\n}\n\n\n/**\n * Throttles a function and delays its execution, so it's only called at most\n * once within a given time period.\n * @param {Function} fn The function to throttle.\n * @param {number} timeout The amount of time that must pass before the\n *     function can be called again.\n * @return {Function} The throttled function.\n */\nfunction throttle(fn, timeout) {\n  var timer = null;\n  return function () {\n    if (!timer) {\n      timer = setTimeout(function() {\n        fn();\n        timer = null;\n      }, timeout);\n    }\n  };\n}\n\n\n/**\n * Adds an event handler to a DOM node ensuring cross-browser compatibility.\n * @param {Node} node The DOM node to add the event handler to.\n * @param {string} event The event name.\n * @param {Function} fn The event handler to add.\n * @param {boolean} opt_useCapture Optionally adds the even to the capture\n *     phase. Note: this only works in modern browsers.\n */\nfunction addEvent(node, event, fn, opt_useCapture) {\n  if (typeof node.addEventListener == 'function') {\n    node.addEventListener(event, fn, opt_useCapture || false);\n  }\n  else if (typeof node.attachEvent == 'function') {\n    node.attachEvent('on' + event, fn);\n  }\n}\n\n\n/**\n * Removes a previously added event handler from a DOM node.\n * @param {Node} node The DOM node to remove the event handler from.\n * @param {string} event The event name.\n * @param {Function} fn The event handler to remove.\n * @param {boolean} opt_useCapture If the event handler was added with this\n *     flag set to true, it should be set to true here in order to remove it.\n */\nfunction removeEvent(node, event, fn, opt_useCapture) {\n  if (typeof node.removeEventListener == 'function') {\n    node.removeEventListener(event, fn, opt_useCapture || false);\n  }\n  else if (typeof node.detatchEvent == 'function') {\n    node.detatchEvent('on' + event, fn);\n  }\n}\n\n\n/**\n * Returns the intersection between two rect objects.\n * @param {Object} rect1 The first rect.\n * @param {Object} rect2 The second rect.\n * @return {?Object|?ClientRect} The intersection rect or undefined if no\n *     intersection is found.\n */\nfunction computeRectIntersection(rect1, rect2) {\n  var top = Math.max(rect1.top, rect2.top);\n  var bottom = Math.min(rect1.bottom, rect2.bottom);\n  var left = Math.max(rect1.left, rect2.left);\n  var right = Math.min(rect1.right, rect2.right);\n  var width = right - left;\n  var height = bottom - top;\n\n  return (width >= 0 && height >= 0) && {\n    top: top,\n    bottom: bottom,\n    left: left,\n    right: right,\n    width: width,\n    height: height\n  } || null;\n}\n\n\n/**\n * Shims the native getBoundingClientRect for compatibility with older IE.\n * @param {Element} el The element whose bounding rect to get.\n * @return {DOMRect|ClientRect} The (possibly shimmed) rect of the element.\n */\nfunction getBoundingClientRect(el) {\n  var rect;\n\n  try {\n    rect = el.getBoundingClientRect();\n  } catch (err) {\n    // Ignore Windows 7 IE11 \"Unspecified error\"\n    // https://github.com/w3c/IntersectionObserver/pull/205\n  }\n\n  if (!rect) return getEmptyRect();\n\n  // Older IE\n  if (!(rect.width && rect.height)) {\n    rect = {\n      top: rect.top,\n      right: rect.right,\n      bottom: rect.bottom,\n      left: rect.left,\n      width: rect.right - rect.left,\n      height: rect.bottom - rect.top\n    };\n  }\n  return rect;\n}\n\n\n/**\n * Returns an empty rect object. An empty rect is returned when an element\n * is not in the DOM.\n * @return {ClientRect} The empty rect.\n */\nfunction getEmptyRect() {\n  return {\n    top: 0,\n    bottom: 0,\n    left: 0,\n    right: 0,\n    width: 0,\n    height: 0\n  };\n}\n\n\n/**\n * Ensure that the result has all of the necessary fields of the DOMRect.\n * Specifically this ensures that `x` and `y` fields are set.\n *\n * @param {?DOMRect|?ClientRect} rect\n * @return {?DOMRect}\n */\nfunction ensureDOMRect(rect) {\n  // A `DOMRect` object has `x` and `y` fields.\n  if (!rect || 'x' in rect) {\n    return rect;\n  }\n  // A IE's `ClientRect` type does not have `x` and `y`. The same is the case\n  // for internally calculated Rect objects. For the purposes of\n  // `IntersectionObserver`, it's sufficient to simply mirror `left` and `top`\n  // for these fields.\n  return {\n    top: rect.top,\n    y: rect.top,\n    bottom: rect.bottom,\n    left: rect.left,\n    x: rect.left,\n    right: rect.right,\n    width: rect.width,\n    height: rect.height\n  };\n}\n\n\n/**\n * Inverts the intersection and bounding rect from the parent (frame) BCR to\n * the local BCR space.\n * @param {DOMRect|ClientRect} parentBoundingRect The parent's bound client rect.\n * @param {DOMRect|ClientRect} parentIntersectionRect The parent's own intersection rect.\n * @return {ClientRect} The local root bounding rect for the parent's children.\n */\nfunction convertFromParentRect(parentBoundingRect, parentIntersectionRect) {\n  var top = parentIntersectionRect.top - parentBoundingRect.top;\n  var left = parentIntersectionRect.left - parentBoundingRect.left;\n  return {\n    top: top,\n    left: left,\n    height: parentIntersectionRect.height,\n    width: parentIntersectionRect.width,\n    bottom: top + parentIntersectionRect.height,\n    right: left + parentIntersectionRect.width\n  };\n}\n\n\n/**\n * Checks to see if a parent element contains a child element (including inside\n * shadow DOM).\n * @param {Node} parent The parent element.\n * @param {Node} child The child element.\n * @return {boolean} True if the parent node contains the child node.\n */\nfunction containsDeep(parent, child) {\n  var node = child;\n  while (node) {\n    if (node == parent) return true;\n\n    node = getParentNode(node);\n  }\n  return false;\n}\n\n\n/**\n * Gets the parent node of an element or its host element if the parent node\n * is a shadow root.\n * @param {Node} node The node whose parent to get.\n * @return {Node|null} The parent node or null if no parent exists.\n */\nfunction getParentNode(node) {\n  var parent = node.parentNode;\n\n  if (node.nodeType == /* DOCUMENT */ 9 && node != document) {\n    // If this node is a document node, look for the embedding frame.\n    return getFrameElement(node);\n  }\n\n  // If the parent has element that is assigned through shadow root slot\n  if (parent && parent.assignedSlot) {\n    parent = parent.assignedSlot.parentNode\n  }\n\n  if (parent && parent.nodeType == 11 && parent.host) {\n    // If the parent is a shadow root, return the host element.\n    return parent.host;\n  }\n\n  return parent;\n}\n\n/**\n * Returns true if `node` is a Document.\n * @param {!Node} node\n * @returns {boolean}\n */\nfunction isDoc(node) {\n  return node && node.nodeType === 9;\n}\n\n\n// Exposes the constructors globally.\nwindow.IntersectionObserver = IntersectionObserver;\nwindow.IntersectionObserverEntry = IntersectionObserverEntry;\n\n}());\n","(function (global, factory) {\n    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :\n    typeof define === 'function' && define.amd ? define(factory) :\n    (global.ResizeObserver = factory());\n}(this, (function () { 'use strict';\n\n    /**\r\n     * A collection of shims that provide minimal functionality of the ES6 collections.\r\n     *\r\n     * These implementations are not meant to be used outside of the ResizeObserver\r\n     * modules as they cover only a limited range of use cases.\r\n     */\r\n    /* eslint-disable require-jsdoc, valid-jsdoc */\r\n    var MapShim = (function () {\r\n        if (typeof Map !== 'undefined') {\r\n            return Map;\r\n        }\r\n        /**\r\n         * Returns index in provided array that matches the specified key.\r\n         *\r\n         * @param {Array<Array>} arr\r\n         * @param {*} key\r\n         * @returns {number}\r\n         */\r\n        function getIndex(arr, key) {\r\n            var result = -1;\r\n            arr.some(function (entry, index) {\r\n                if (entry[0] === key) {\r\n                    result = index;\r\n                    return true;\r\n                }\r\n                return false;\r\n            });\r\n            return result;\r\n        }\r\n        return /** @class */ (function () {\r\n            function class_1() {\r\n                this.__entries__ = [];\r\n            }\r\n            Object.defineProperty(class_1.prototype, \"size\", {\r\n                /**\r\n                 * @returns {boolean}\r\n                 */\r\n                get: function () {\r\n                    return this.__entries__.length;\r\n                },\r\n                enumerable: true,\r\n                configurable: true\r\n            });\r\n            /**\r\n             * @param {*} key\r\n             * @returns {*}\r\n             */\r\n            class_1.prototype.get = function (key) {\r\n                var index = getIndex(this.__entries__, key);\r\n                var entry = this.__entries__[index];\r\n                return entry && entry[1];\r\n            };\r\n            /**\r\n             * @param {*} key\r\n             * @param {*} value\r\n             * @returns {void}\r\n             */\r\n            class_1.prototype.set = function (key, value) {\r\n                var index = getIndex(this.__entries__, key);\r\n                if (~index) {\r\n                    this.__entries__[index][1] = value;\r\n                }\r\n                else {\r\n                    this.__entries__.push([key, value]);\r\n                }\r\n            };\r\n            /**\r\n             * @param {*} key\r\n             * @returns {void}\r\n             */\r\n            class_1.prototype.delete = function (key) {\r\n                var entries = this.__entries__;\r\n                var index = getIndex(entries, key);\r\n                if (~index) {\r\n                    entries.splice(index, 1);\r\n                }\r\n            };\r\n            /**\r\n             * @param {*} key\r\n             * @returns {void}\r\n             */\r\n            class_1.prototype.has = function (key) {\r\n                return !!~getIndex(this.__entries__, key);\r\n            };\r\n            /**\r\n             * @returns {void}\r\n             */\r\n            class_1.prototype.clear = function () {\r\n                this.__entries__.splice(0);\r\n            };\r\n            /**\r\n             * @param {Function} callback\r\n             * @param {*} [ctx=null]\r\n             * @returns {void}\r\n             */\r\n            class_1.prototype.forEach = function (callback, ctx) {\r\n                if (ctx === void 0) { ctx = null; }\r\n                for (var _i = 0, _a = this.__entries__; _i < _a.length; _i++) {\r\n                    var entry = _a[_i];\r\n                    callback.call(ctx, entry[1], entry[0]);\r\n                }\r\n            };\r\n            return class_1;\r\n        }());\r\n    })();\n\n    /**\r\n     * Detects whether window and document objects are available in current environment.\r\n     */\r\n    var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && window.document === document;\n\n    // Returns global object of a current environment.\r\n    var global$1 = (function () {\r\n        if (typeof global !== 'undefined' && global.Math === Math) {\r\n            return global;\r\n        }\r\n        if (typeof self !== 'undefined' && self.Math === Math) {\r\n            return self;\r\n        }\r\n        if (typeof window !== 'undefined' && window.Math === Math) {\r\n            return window;\r\n        }\r\n        // eslint-disable-next-line no-new-func\r\n        return Function('return this')();\r\n    })();\n\n    /**\r\n     * A shim for the requestAnimationFrame which falls back to the setTimeout if\r\n     * first one is not supported.\r\n     *\r\n     * @returns {number} Requests' identifier.\r\n     */\r\n    var requestAnimationFrame$1 = (function () {\r\n        if (typeof requestAnimationFrame === 'function') {\r\n            // It's required to use a bounded function because IE sometimes throws\r\n            // an \"Invalid calling object\" error if rAF is invoked without the global\r\n            // object on the left hand side.\r\n            return requestAnimationFrame.bind(global$1);\r\n        }\r\n        return function (callback) { return setTimeout(function () { return callback(Date.now()); }, 1000 / 60); };\r\n    })();\n\n    // Defines minimum timeout before adding a trailing call.\r\n    var trailingTimeout = 2;\r\n    /**\r\n     * Creates a wrapper function which ensures that provided callback will be\r\n     * invoked only once during the specified delay period.\r\n     *\r\n     * @param {Function} callback - Function to be invoked after the delay period.\r\n     * @param {number} delay - Delay after which to invoke callback.\r\n     * @returns {Function}\r\n     */\r\n    function throttle (callback, delay) {\r\n        var leadingCall = false, trailingCall = false, lastCallTime = 0;\r\n        /**\r\n         * Invokes the original callback function and schedules new invocation if\r\n         * the \"proxy\" was called during current request.\r\n         *\r\n         * @returns {void}\r\n         */\r\n        function resolvePending() {\r\n            if (leadingCall) {\r\n                leadingCall = false;\r\n                callback();\r\n            }\r\n            if (trailingCall) {\r\n                proxy();\r\n            }\r\n        }\r\n        /**\r\n         * Callback invoked after the specified delay. It will further postpone\r\n         * invocation of the original function delegating it to the\r\n         * requestAnimationFrame.\r\n         *\r\n         * @returns {void}\r\n         */\r\n        function timeoutCallback() {\r\n            requestAnimationFrame$1(resolvePending);\r\n        }\r\n        /**\r\n         * Schedules invocation of the original function.\r\n         *\r\n         * @returns {void}\r\n         */\r\n        function proxy() {\r\n            var timeStamp = Date.now();\r\n            if (leadingCall) {\r\n                // Reject immediately following calls.\r\n                if (timeStamp - lastCallTime < trailingTimeout) {\r\n                    return;\r\n                }\r\n                // Schedule new call to be in invoked when the pending one is resolved.\r\n                // This is important for \"transitions\" which never actually start\r\n                // immediately so there is a chance that we might miss one if change\r\n                // happens amids the pending invocation.\r\n                trailingCall = true;\r\n            }\r\n            else {\r\n                leadingCall = true;\r\n                trailingCall = false;\r\n                setTimeout(timeoutCallback, delay);\r\n            }\r\n            lastCallTime = timeStamp;\r\n        }\r\n        return proxy;\r\n    }\n\n    // Minimum delay before invoking the update of observers.\r\n    var REFRESH_DELAY = 20;\r\n    // A list of substrings of CSS properties used to find transition events that\r\n    // might affect dimensions of observed elements.\r\n    var transitionKeys = ['top', 'right', 'bottom', 'left', 'width', 'height', 'size', 'weight'];\r\n    // Check if MutationObserver is available.\r\n    var mutationObserverSupported = typeof MutationObserver !== 'undefined';\r\n    /**\r\n     * Singleton controller class which handles updates of ResizeObserver instances.\r\n     */\r\n    var ResizeObserverController = /** @class */ (function () {\r\n        /**\r\n         * Creates a new instance of ResizeObserverController.\r\n         *\r\n         * @private\r\n         */\r\n        function ResizeObserverController() {\r\n            /**\r\n             * Indicates whether DOM listeners have been added.\r\n             *\r\n             * @private {boolean}\r\n             */\r\n            this.connected_ = false;\r\n            /**\r\n             * Tells that controller has subscribed for Mutation Events.\r\n             *\r\n             * @private {boolean}\r\n             */\r\n            this.mutationEventsAdded_ = false;\r\n            /**\r\n             * Keeps reference to the instance of MutationObserver.\r\n             *\r\n             * @private {MutationObserver}\r\n             */\r\n            this.mutationsObserver_ = null;\r\n            /**\r\n             * A list of connected observers.\r\n             *\r\n             * @private {Array<ResizeObserverSPI>}\r\n             */\r\n            this.observers_ = [];\r\n            this.onTransitionEnd_ = this.onTransitionEnd_.bind(this);\r\n            this.refresh = throttle(this.refresh.bind(this), REFRESH_DELAY);\r\n        }\r\n        /**\r\n         * Adds observer to observers list.\r\n         *\r\n         * @param {ResizeObserverSPI} observer - Observer to be added.\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverController.prototype.addObserver = function (observer) {\r\n            if (!~this.observers_.indexOf(observer)) {\r\n                this.observers_.push(observer);\r\n            }\r\n            // Add listeners if they haven't been added yet.\r\n            if (!this.connected_) {\r\n                this.connect_();\r\n            }\r\n        };\r\n        /**\r\n         * Removes observer from observers list.\r\n         *\r\n         * @param {ResizeObserverSPI} observer - Observer to be removed.\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverController.prototype.removeObserver = function (observer) {\r\n            var observers = this.observers_;\r\n            var index = observers.indexOf(observer);\r\n            // Remove observer if it's present in registry.\r\n            if (~index) {\r\n                observers.splice(index, 1);\r\n            }\r\n            // Remove listeners if controller has no connected observers.\r\n            if (!observers.length && this.connected_) {\r\n                this.disconnect_();\r\n            }\r\n        };\r\n        /**\r\n         * Invokes the update of observers. It will continue running updates insofar\r\n         * it detects changes.\r\n         *\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverController.prototype.refresh = function () {\r\n            var changesDetected = this.updateObservers_();\r\n            // Continue running updates if changes have been detected as there might\r\n            // be future ones caused by CSS transitions.\r\n            if (changesDetected) {\r\n                this.refresh();\r\n            }\r\n        };\r\n        /**\r\n         * Updates every observer from observers list and notifies them of queued\r\n         * entries.\r\n         *\r\n         * @private\r\n         * @returns {boolean} Returns \"true\" if any observer has detected changes in\r\n         *      dimensions of it's elements.\r\n         */\r\n        ResizeObserverController.prototype.updateObservers_ = function () {\r\n            // Collect observers that have active observations.\r\n            var activeObservers = this.observers_.filter(function (observer) {\r\n                return observer.gatherActive(), observer.hasActive();\r\n            });\r\n            // Deliver notifications in a separate cycle in order to avoid any\r\n            // collisions between observers, e.g. when multiple instances of\r\n            // ResizeObserver are tracking the same element and the callback of one\r\n            // of them changes content dimensions of the observed target. Sometimes\r\n            // this may result in notifications being blocked for the rest of observers.\r\n            activeObservers.forEach(function (observer) { return observer.broadcastActive(); });\r\n            return activeObservers.length > 0;\r\n        };\r\n        /**\r\n         * Initializes DOM listeners.\r\n         *\r\n         * @private\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverController.prototype.connect_ = function () {\r\n            // Do nothing if running in a non-browser environment or if listeners\r\n            // have been already added.\r\n            if (!isBrowser || this.connected_) {\r\n                return;\r\n            }\r\n            // Subscription to the \"Transitionend\" event is used as a workaround for\r\n            // delayed transitions. This way it's possible to capture at least the\r\n            // final state of an element.\r\n            document.addEventListener('transitionend', this.onTransitionEnd_);\r\n            window.addEventListener('resize', this.refresh);\r\n            if (mutationObserverSupported) {\r\n                this.mutationsObserver_ = new MutationObserver(this.refresh);\r\n                this.mutationsObserver_.observe(document, {\r\n                    attributes: true,\r\n                    childList: true,\r\n                    characterData: true,\r\n                    subtree: true\r\n                });\r\n            }\r\n            else {\r\n                document.addEventListener('DOMSubtreeModified', this.refresh);\r\n                this.mutationEventsAdded_ = true;\r\n            }\r\n            this.connected_ = true;\r\n        };\r\n        /**\r\n         * Removes DOM listeners.\r\n         *\r\n         * @private\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverController.prototype.disconnect_ = function () {\r\n            // Do nothing if running in a non-browser environment or if listeners\r\n            // have been already removed.\r\n            if (!isBrowser || !this.connected_) {\r\n                return;\r\n            }\r\n            document.removeEventListener('transitionend', this.onTransitionEnd_);\r\n            window.removeEventListener('resize', this.refresh);\r\n            if (this.mutationsObserver_) {\r\n                this.mutationsObserver_.disconnect();\r\n            }\r\n            if (this.mutationEventsAdded_) {\r\n                document.removeEventListener('DOMSubtreeModified', this.refresh);\r\n            }\r\n            this.mutationsObserver_ = null;\r\n            this.mutationEventsAdded_ = false;\r\n            this.connected_ = false;\r\n        };\r\n        /**\r\n         * \"Transitionend\" event handler.\r\n         *\r\n         * @private\r\n         * @param {TransitionEvent} event\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverController.prototype.onTransitionEnd_ = function (_a) {\r\n            var _b = _a.propertyName, propertyName = _b === void 0 ? '' : _b;\r\n            // Detect whether transition may affect dimensions of an element.\r\n            var isReflowProperty = transitionKeys.some(function (key) {\r\n                return !!~propertyName.indexOf(key);\r\n            });\r\n            if (isReflowProperty) {\r\n                this.refresh();\r\n            }\r\n        };\r\n        /**\r\n         * Returns instance of the ResizeObserverController.\r\n         *\r\n         * @returns {ResizeObserverController}\r\n         */\r\n        ResizeObserverController.getInstance = function () {\r\n            if (!this.instance_) {\r\n                this.instance_ = new ResizeObserverController();\r\n            }\r\n            return this.instance_;\r\n        };\r\n        /**\r\n         * Holds reference to the controller's instance.\r\n         *\r\n         * @private {ResizeObserverController}\r\n         */\r\n        ResizeObserverController.instance_ = null;\r\n        return ResizeObserverController;\r\n    }());\n\n    /**\r\n     * Defines non-writable/enumerable properties of the provided target object.\r\n     *\r\n     * @param {Object} target - Object for which to define properties.\r\n     * @param {Object} props - Properties to be defined.\r\n     * @returns {Object} Target object.\r\n     */\r\n    var defineConfigurable = (function (target, props) {\r\n        for (var _i = 0, _a = Object.keys(props); _i < _a.length; _i++) {\r\n            var key = _a[_i];\r\n            Object.defineProperty(target, key, {\r\n                value: props[key],\r\n                enumerable: false,\r\n                writable: false,\r\n                configurable: true\r\n            });\r\n        }\r\n        return target;\r\n    });\n\n    /**\r\n     * Returns the global object associated with provided element.\r\n     *\r\n     * @param {Object} target\r\n     * @returns {Object}\r\n     */\r\n    var getWindowOf = (function (target) {\r\n        // Assume that the element is an instance of Node, which means that it\r\n        // has the \"ownerDocument\" property from which we can retrieve a\r\n        // corresponding global object.\r\n        var ownerGlobal = target && target.ownerDocument && target.ownerDocument.defaultView;\r\n        // Return the local global object if it's not possible extract one from\r\n        // provided element.\r\n        return ownerGlobal || global$1;\r\n    });\n\n    // Placeholder of an empty content rectangle.\r\n    var emptyRect = createRectInit(0, 0, 0, 0);\r\n    /**\r\n     * Converts provided string to a number.\r\n     *\r\n     * @param {number|string} value\r\n     * @returns {number}\r\n     */\r\n    function toFloat(value) {\r\n        return parseFloat(value) || 0;\r\n    }\r\n    /**\r\n     * Extracts borders size from provided styles.\r\n     *\r\n     * @param {CSSStyleDeclaration} styles\r\n     * @param {...string} positions - Borders positions (top, right, ...)\r\n     * @returns {number}\r\n     */\r\n    function getBordersSize(styles) {\r\n        var positions = [];\r\n        for (var _i = 1; _i < arguments.length; _i++) {\r\n            positions[_i - 1] = arguments[_i];\r\n        }\r\n        return positions.reduce(function (size, position) {\r\n            var value = styles['border-' + position + '-width'];\r\n            return size + toFloat(value);\r\n        }, 0);\r\n    }\r\n    /**\r\n     * Extracts paddings sizes from provided styles.\r\n     *\r\n     * @param {CSSStyleDeclaration} styles\r\n     * @returns {Object} Paddings box.\r\n     */\r\n    function getPaddings(styles) {\r\n        var positions = ['top', 'right', 'bottom', 'left'];\r\n        var paddings = {};\r\n        for (var _i = 0, positions_1 = positions; _i < positions_1.length; _i++) {\r\n            var position = positions_1[_i];\r\n            var value = styles['padding-' + position];\r\n            paddings[position] = toFloat(value);\r\n        }\r\n        return paddings;\r\n    }\r\n    /**\r\n     * Calculates content rectangle of provided SVG element.\r\n     *\r\n     * @param {SVGGraphicsElement} target - Element content rectangle of which needs\r\n     *      to be calculated.\r\n     * @returns {DOMRectInit}\r\n     */\r\n    function getSVGContentRect(target) {\r\n        var bbox = target.getBBox();\r\n        return createRectInit(0, 0, bbox.width, bbox.height);\r\n    }\r\n    /**\r\n     * Calculates content rectangle of provided HTMLElement.\r\n     *\r\n     * @param {HTMLElement} target - Element for which to calculate the content rectangle.\r\n     * @returns {DOMRectInit}\r\n     */\r\n    function getHTMLElementContentRect(target) {\r\n        // Client width & height properties can't be\r\n        // used exclusively as they provide rounded values.\r\n        var clientWidth = target.clientWidth, clientHeight = target.clientHeight;\r\n        // By this condition we can catch all non-replaced inline, hidden and\r\n        // detached elements. Though elements with width & height properties less\r\n        // than 0.5 will be discarded as well.\r\n        //\r\n        // Without it we would need to implement separate methods for each of\r\n        // those cases and it's not possible to perform a precise and performance\r\n        // effective test for hidden elements. E.g. even jQuery's ':visible' filter\r\n        // gives wrong results for elements with width & height less than 0.5.\r\n        if (!clientWidth && !clientHeight) {\r\n            return emptyRect;\r\n        }\r\n        var styles = getWindowOf(target).getComputedStyle(target);\r\n        var paddings = getPaddings(styles);\r\n        var horizPad = paddings.left + paddings.right;\r\n        var vertPad = paddings.top + paddings.bottom;\r\n        // Computed styles of width & height are being used because they are the\r\n        // only dimensions available to JS that contain non-rounded values. It could\r\n        // be possible to utilize the getBoundingClientRect if only it's data wasn't\r\n        // affected by CSS transformations let alone paddings, borders and scroll bars.\r\n        var width = toFloat(styles.width), height = toFloat(styles.height);\r\n        // Width & height include paddings and borders when the 'border-box' box\r\n        // model is applied (except for IE).\r\n        if (styles.boxSizing === 'border-box') {\r\n            // Following conditions are required to handle Internet Explorer which\r\n            // doesn't include paddings and borders to computed CSS dimensions.\r\n            //\r\n            // We can say that if CSS dimensions + paddings are equal to the \"client\"\r\n            // properties then it's either IE, and thus we don't need to subtract\r\n            // anything, or an element merely doesn't have paddings/borders styles.\r\n            if (Math.round(width + horizPad) !== clientWidth) {\r\n                width -= getBordersSize(styles, 'left', 'right') + horizPad;\r\n            }\r\n            if (Math.round(height + vertPad) !== clientHeight) {\r\n                height -= getBordersSize(styles, 'top', 'bottom') + vertPad;\r\n            }\r\n        }\r\n        // Following steps can't be applied to the document's root element as its\r\n        // client[Width/Height] properties represent viewport area of the window.\r\n        // Besides, it's as well not necessary as the <html> itself neither has\r\n        // rendered scroll bars nor it can be clipped.\r\n        if (!isDocumentElement(target)) {\r\n            // In some browsers (only in Firefox, actually) CSS width & height\r\n            // include scroll bars size which can be removed at this step as scroll\r\n            // bars are the only difference between rounded dimensions + paddings\r\n            // and \"client\" properties, though that is not always true in Chrome.\r\n            var vertScrollbar = Math.round(width + horizPad) - clientWidth;\r\n            var horizScrollbar = Math.round(height + vertPad) - clientHeight;\r\n            // Chrome has a rather weird rounding of \"client\" properties.\r\n            // E.g. for an element with content width of 314.2px it sometimes gives\r\n            // the client width of 315px and for the width of 314.7px it may give\r\n            // 314px. And it doesn't happen all the time. So just ignore this delta\r\n            // as a non-relevant.\r\n            if (Math.abs(vertScrollbar) !== 1) {\r\n                width -= vertScrollbar;\r\n            }\r\n            if (Math.abs(horizScrollbar) !== 1) {\r\n                height -= horizScrollbar;\r\n            }\r\n        }\r\n        return createRectInit(paddings.left, paddings.top, width, height);\r\n    }\r\n    /**\r\n     * Checks whether provided element is an instance of the SVGGraphicsElement.\r\n     *\r\n     * @param {Element} target - Element to be checked.\r\n     * @returns {boolean}\r\n     */\r\n    var isSVGGraphicsElement = (function () {\r\n        // Some browsers, namely IE and Edge, don't have the SVGGraphicsElement\r\n        // interface.\r\n        if (typeof SVGGraphicsElement !== 'undefined') {\r\n            return function (target) { return target instanceof getWindowOf(target).SVGGraphicsElement; };\r\n        }\r\n        // If it's so, then check that element is at least an instance of the\r\n        // SVGElement and that it has the \"getBBox\" method.\r\n        // eslint-disable-next-line no-extra-parens\r\n        return function (target) { return (target instanceof getWindowOf(target).SVGElement &&\r\n            typeof target.getBBox === 'function'); };\r\n    })();\r\n    /**\r\n     * Checks whether provided element is a document element (<html>).\r\n     *\r\n     * @param {Element} target - Element to be checked.\r\n     * @returns {boolean}\r\n     */\r\n    function isDocumentElement(target) {\r\n        return target === getWindowOf(target).document.documentElement;\r\n    }\r\n    /**\r\n     * Calculates an appropriate content rectangle for provided html or svg element.\r\n     *\r\n     * @param {Element} target - Element content rectangle of which needs to be calculated.\r\n     * @returns {DOMRectInit}\r\n     */\r\n    function getContentRect(target) {\r\n        if (!isBrowser) {\r\n            return emptyRect;\r\n        }\r\n        if (isSVGGraphicsElement(target)) {\r\n            return getSVGContentRect(target);\r\n        }\r\n        return getHTMLElementContentRect(target);\r\n    }\r\n    /**\r\n     * Creates rectangle with an interface of the DOMRectReadOnly.\r\n     * Spec: https://drafts.fxtf.org/geometry/#domrectreadonly\r\n     *\r\n     * @param {DOMRectInit} rectInit - Object with rectangle's x/y coordinates and dimensions.\r\n     * @returns {DOMRectReadOnly}\r\n     */\r\n    function createReadOnlyRect(_a) {\r\n        var x = _a.x, y = _a.y, width = _a.width, height = _a.height;\r\n        // If DOMRectReadOnly is available use it as a prototype for the rectangle.\r\n        var Constr = typeof DOMRectReadOnly !== 'undefined' ? DOMRectReadOnly : Object;\r\n        var rect = Object.create(Constr.prototype);\r\n        // Rectangle's properties are not writable and non-enumerable.\r\n        defineConfigurable(rect, {\r\n            x: x, y: y, width: width, height: height,\r\n            top: y,\r\n            right: x + width,\r\n            bottom: height + y,\r\n            left: x\r\n        });\r\n        return rect;\r\n    }\r\n    /**\r\n     * Creates DOMRectInit object based on the provided dimensions and the x/y coordinates.\r\n     * Spec: https://drafts.fxtf.org/geometry/#dictdef-domrectinit\r\n     *\r\n     * @param {number} x - X coordinate.\r\n     * @param {number} y - Y coordinate.\r\n     * @param {number} width - Rectangle's width.\r\n     * @param {number} height - Rectangle's height.\r\n     * @returns {DOMRectInit}\r\n     */\r\n    function createRectInit(x, y, width, height) {\r\n        return { x: x, y: y, width: width, height: height };\r\n    }\n\n    /**\r\n     * Class that is responsible for computations of the content rectangle of\r\n     * provided DOM element and for keeping track of it's changes.\r\n     */\r\n    var ResizeObservation = /** @class */ (function () {\r\n        /**\r\n         * Creates an instance of ResizeObservation.\r\n         *\r\n         * @param {Element} target - Element to be observed.\r\n         */\r\n        function ResizeObservation(target) {\r\n            /**\r\n             * Broadcasted width of content rectangle.\r\n             *\r\n             * @type {number}\r\n             */\r\n            this.broadcastWidth = 0;\r\n            /**\r\n             * Broadcasted height of content rectangle.\r\n             *\r\n             * @type {number}\r\n             */\r\n            this.broadcastHeight = 0;\r\n            /**\r\n             * Reference to the last observed content rectangle.\r\n             *\r\n             * @private {DOMRectInit}\r\n             */\r\n            this.contentRect_ = createRectInit(0, 0, 0, 0);\r\n            this.target = target;\r\n        }\r\n        /**\r\n         * Updates content rectangle and tells whether it's width or height properties\r\n         * have changed since the last broadcast.\r\n         *\r\n         * @returns {boolean}\r\n         */\r\n        ResizeObservation.prototype.isActive = function () {\r\n            var rect = getContentRect(this.target);\r\n            this.contentRect_ = rect;\r\n            return (rect.width !== this.broadcastWidth ||\r\n                rect.height !== this.broadcastHeight);\r\n        };\r\n        /**\r\n         * Updates 'broadcastWidth' and 'broadcastHeight' properties with a data\r\n         * from the corresponding properties of the last observed content rectangle.\r\n         *\r\n         * @returns {DOMRectInit} Last observed content rectangle.\r\n         */\r\n        ResizeObservation.prototype.broadcastRect = function () {\r\n            var rect = this.contentRect_;\r\n            this.broadcastWidth = rect.width;\r\n            this.broadcastHeight = rect.height;\r\n            return rect;\r\n        };\r\n        return ResizeObservation;\r\n    }());\n\n    var ResizeObserverEntry = /** @class */ (function () {\r\n        /**\r\n         * Creates an instance of ResizeObserverEntry.\r\n         *\r\n         * @param {Element} target - Element that is being observed.\r\n         * @param {DOMRectInit} rectInit - Data of the element's content rectangle.\r\n         */\r\n        function ResizeObserverEntry(target, rectInit) {\r\n            var contentRect = createReadOnlyRect(rectInit);\r\n            // According to the specification following properties are not writable\r\n            // and are also not enumerable in the native implementation.\r\n            //\r\n            // Property accessors are not being used as they'd require to define a\r\n            // private WeakMap storage which may cause memory leaks in browsers that\r\n            // don't support this type of collections.\r\n            defineConfigurable(this, { target: target, contentRect: contentRect });\r\n        }\r\n        return ResizeObserverEntry;\r\n    }());\n\n    var ResizeObserverSPI = /** @class */ (function () {\r\n        /**\r\n         * Creates a new instance of ResizeObserver.\r\n         *\r\n         * @param {ResizeObserverCallback} callback - Callback function that is invoked\r\n         *      when one of the observed elements changes it's content dimensions.\r\n         * @param {ResizeObserverController} controller - Controller instance which\r\n         *      is responsible for the updates of observer.\r\n         * @param {ResizeObserver} callbackCtx - Reference to the public\r\n         *      ResizeObserver instance which will be passed to callback function.\r\n         */\r\n        function ResizeObserverSPI(callback, controller, callbackCtx) {\r\n            /**\r\n             * Collection of resize observations that have detected changes in dimensions\r\n             * of elements.\r\n             *\r\n             * @private {Array<ResizeObservation>}\r\n             */\r\n            this.activeObservations_ = [];\r\n            /**\r\n             * Registry of the ResizeObservation instances.\r\n             *\r\n             * @private {Map<Element, ResizeObservation>}\r\n             */\r\n            this.observations_ = new MapShim();\r\n            if (typeof callback !== 'function') {\r\n                throw new TypeError('The callback provided as parameter 1 is not a function.');\r\n            }\r\n            this.callback_ = callback;\r\n            this.controller_ = controller;\r\n            this.callbackCtx_ = callbackCtx;\r\n        }\r\n        /**\r\n         * Starts observing provided element.\r\n         *\r\n         * @param {Element} target - Element to be observed.\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverSPI.prototype.observe = function (target) {\r\n            if (!arguments.length) {\r\n                throw new TypeError('1 argument required, but only 0 present.');\r\n            }\r\n            // Do nothing if current environment doesn't have the Element interface.\r\n            if (typeof Element === 'undefined' || !(Element instanceof Object)) {\r\n                return;\r\n            }\r\n            if (!(target instanceof getWindowOf(target).Element)) {\r\n                throw new TypeError('parameter 1 is not of type \"Element\".');\r\n            }\r\n            var observations = this.observations_;\r\n            // Do nothing if element is already being observed.\r\n            if (observations.has(target)) {\r\n                return;\r\n            }\r\n            observations.set(target, new ResizeObservation(target));\r\n            this.controller_.addObserver(this);\r\n            // Force the update of observations.\r\n            this.controller_.refresh();\r\n        };\r\n        /**\r\n         * Stops observing provided element.\r\n         *\r\n         * @param {Element} target - Element to stop observing.\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverSPI.prototype.unobserve = function (target) {\r\n            if (!arguments.length) {\r\n                throw new TypeError('1 argument required, but only 0 present.');\r\n            }\r\n            // Do nothing if current environment doesn't have the Element interface.\r\n            if (typeof Element === 'undefined' || !(Element instanceof Object)) {\r\n                return;\r\n            }\r\n            if (!(target instanceof getWindowOf(target).Element)) {\r\n                throw new TypeError('parameter 1 is not of type \"Element\".');\r\n            }\r\n            var observations = this.observations_;\r\n            // Do nothing if element is not being observed.\r\n            if (!observations.has(target)) {\r\n                return;\r\n            }\r\n            observations.delete(target);\r\n            if (!observations.size) {\r\n                this.controller_.removeObserver(this);\r\n            }\r\n        };\r\n        /**\r\n         * Stops observing all elements.\r\n         *\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverSPI.prototype.disconnect = function () {\r\n            this.clearActive();\r\n            this.observations_.clear();\r\n            this.controller_.removeObserver(this);\r\n        };\r\n        /**\r\n         * Collects observation instances the associated element of which has changed\r\n         * it's content rectangle.\r\n         *\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverSPI.prototype.gatherActive = function () {\r\n            var _this = this;\r\n            this.clearActive();\r\n            this.observations_.forEach(function (observation) {\r\n                if (observation.isActive()) {\r\n                    _this.activeObservations_.push(observation);\r\n                }\r\n            });\r\n        };\r\n        /**\r\n         * Invokes initial callback function with a list of ResizeObserverEntry\r\n         * instances collected from active resize observations.\r\n         *\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverSPI.prototype.broadcastActive = function () {\r\n            // Do nothing if observer doesn't have active observations.\r\n            if (!this.hasActive()) {\r\n                return;\r\n            }\r\n            var ctx = this.callbackCtx_;\r\n            // Create ResizeObserverEntry instance for every active observation.\r\n            var entries = this.activeObservations_.map(function (observation) {\r\n                return new ResizeObserverEntry(observation.target, observation.broadcastRect());\r\n            });\r\n            this.callback_.call(ctx, entries, ctx);\r\n            this.clearActive();\r\n        };\r\n        /**\r\n         * Clears the collection of active observations.\r\n         *\r\n         * @returns {void}\r\n         */\r\n        ResizeObserverSPI.prototype.clearActive = function () {\r\n            this.activeObservations_.splice(0);\r\n        };\r\n        /**\r\n         * Tells whether observer has active observations.\r\n         *\r\n         * @returns {boolean}\r\n         */\r\n        ResizeObserverSPI.prototype.hasActive = function () {\r\n            return this.activeObservations_.length > 0;\r\n        };\r\n        return ResizeObserverSPI;\r\n    }());\n\n    // Registry of internal observers. If WeakMap is not available use current shim\r\n    // for the Map collection as it has all required methods and because WeakMap\r\n    // can't be fully polyfilled anyway.\r\n    var observers = typeof WeakMap !== 'undefined' ? new WeakMap() : new MapShim();\r\n    /**\r\n     * ResizeObserver API. Encapsulates the ResizeObserver SPI implementation\r\n     * exposing only those methods and properties that are defined in the spec.\r\n     */\r\n    var ResizeObserver = /** @class */ (function () {\r\n        /**\r\n         * Creates a new instance of ResizeObserver.\r\n         *\r\n         * @param {ResizeObserverCallback} callback - Callback that is invoked when\r\n         *      dimensions of the observed elements change.\r\n         */\r\n        function ResizeObserver(callback) {\r\n            if (!(this instanceof ResizeObserver)) {\r\n                throw new TypeError('Cannot call a class as a function.');\r\n            }\r\n            if (!arguments.length) {\r\n                throw new TypeError('1 argument required, but only 0 present.');\r\n            }\r\n            var controller = ResizeObserverController.getInstance();\r\n            var observer = new ResizeObserverSPI(callback, controller, this);\r\n            observers.set(this, observer);\r\n        }\r\n        return ResizeObserver;\r\n    }());\r\n    // Expose public methods of ResizeObserver.\r\n    [\r\n        'observe',\r\n        'unobserve',\r\n        'disconnect'\r\n    ].forEach(function (method) {\r\n        ResizeObserver.prototype[method] = function () {\r\n            var _a;\r\n            return (_a = observers.get(this))[method].apply(_a, arguments);\r\n        };\r\n    });\n\n    var index = (function () {\r\n        // Export existing implementation if available.\r\n        if (typeof global$1.ResizeObserver !== 'undefined') {\r\n            return global$1.ResizeObserver;\r\n        }\r\n        return ResizeObserver;\r\n    })();\n\n    return index;\n\n})));\n"],"names":[],"sourceRoot":"webpack:///"}