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support = {\n  searchParams: 'URLSearchParams' in self,\n  iterable: 'Symbol' in self && 'iterator' in Symbol,\n  blob:\n    'FileReader' in self &&\n    'Blob' in self &&\n    (function() {\n      try {\n        new Blob()\n        return true\n      } catch (e) {\n        return false\n      }\n    })(),\n  formData: 'FormData' in self,\n  arrayBuffer: 'ArrayBuffer' in self\n}\n\nfunction isDataView(obj) {\n  return obj && DataView.prototype.isPrototypeOf(obj)\n}\n\nif (support.arrayBuffer) {\n  var viewClasses = [\n    '[object Int8Array]',\n    '[object Uint8Array]',\n    '[object Uint8ClampedArray]',\n    '[object Int16Array]',\n    '[object Uint16Array]',\n    '[object Int32Array]',\n    '[object Uint32Array]',\n    '[object Float32Array]',\n    '[object Float64Array]'\n  ]\n\n  var isArrayBufferView =\n    ArrayBuffer.isView ||\n    function(obj) {\n      return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1\n    }\n}\n\nfunction normalizeName(name) {\n  if (typeof name !== 'string') {\n    name = String(name)\n  }\n  if (/[^a-z0-9\\-#$%&'*+.^_`|~]/i.test(name)) {\n    throw new TypeError('Invalid character in header field name')\n  }\n  return name.toLowerCase()\n}\n\nfunction normalizeValue(value) {\n  if (typeof value !== 'string') {\n    value = String(value)\n  }\n  return value\n}\n\n// Build a destructive iterator for the value list\nfunction iteratorFor(items) {\n  var iterator = {\n    next: function() {\n      var value = items.shift()\n      return {done: value === undefined, value: value}\n    }\n  }\n\n  if (support.iterable) {\n    iterator[Symbol.iterator] = function() {\n      return iterator\n    }\n  }\n\n  return iterator\n}\n\nexport function Headers(headers) {\n  this.map = {}\n\n  if (headers instanceof Headers) {\n    headers.forEach(function(value, name) {\n      this.append(name, value)\n    }, this)\n  } else if (Array.isArray(headers)) {\n    headers.forEach(function(header) {\n      this.append(header[0], 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this.map[name], name, this)\n    }\n  }\n}\n\nHeaders.prototype.keys = function() {\n  var items = []\n  this.forEach(function(value, name) {\n    items.push(name)\n  })\n  return iteratorFor(items)\n}\n\nHeaders.prototype.values = function() {\n  var items = []\n  this.forEach(function(value) {\n    items.push(value)\n  })\n  return iteratorFor(items)\n}\n\nHeaders.prototype.entries = function() {\n  var items = []\n  this.forEach(function(value, name) {\n    items.push([name, value])\n  })\n  return iteratorFor(items)\n}\n\nif (support.iterable) {\n  Headers.prototype[Symbol.iterator] = Headers.prototype.entries\n}\n\nfunction consumed(body) {\n  if (body.bodyUsed) {\n    return Promise.reject(new TypeError('Already read'))\n  }\n  body.bodyUsed = true\n}\n\nfunction fileReaderReady(reader) {\n  return new Promise(function(resolve, reject) {\n    reader.onload = function() {\n      resolve(reader.result)\n    }\n    reader.onerror = function() {\n      reject(reader.error)\n    }\n  })\n}\n\nfunction readBlobAsArrayBuffer(blob) {\n  var reader = new FileReader()\n  var promise = fileReaderReady(reader)\n  reader.readAsArrayBuffer(blob)\n  return promise\n}\n\nfunction readBlobAsText(blob) {\n  var reader = new FileReader()\n  var promise = fileReaderReady(reader)\n  reader.readAsText(blob)\n  return promise\n}\n\nfunction readArrayBufferAsText(buf) {\n  var view = new Uint8Array(buf)\n  var chars = new Array(view.length)\n\n  for (var i = 0; i < view.length; i++) {\n    chars[i] = String.fromCharCode(view[i])\n  }\n  return chars.join('')\n}\n\nfunction bufferClone(buf) {\n  if (buf.slice) {\n    return buf.slice(0)\n  } else {\n    var view = new Uint8Array(buf.byteLength)\n    view.set(new Uint8Array(buf))\n    return view.buffer\n  }\n}\n\nfunction Body() {\n  this.bodyUsed = false\n\n  this._initBody = function(body) {\n    this._bodyInit = body\n    if (!body) {\n      this._bodyText = ''\n    } else if (typeof body === 'string') {\n      this._bodyText = body\n    } else if (support.blob && Blob.prototype.isPrototypeOf(body)) {\n      this._bodyBlob = body\n    } else if (support.formData && FormData.prototype.isPrototypeOf(body)) {\n      this._bodyFormData = body\n    } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {\n      this._bodyText = body.toString()\n    } else if (support.arrayBuffer && support.blob && isDataView(body)) {\n      this._bodyArrayBuffer = bufferClone(body.buffer)\n      // IE 10-11 can't handle a DataView body.\n      this._bodyInit = new Blob([this._bodyArrayBuffer])\n    } else if (support.arrayBuffer && (ArrayBuffer.prototype.isPrototypeOf(body) || isArrayBufferView(body))) {\n      this._bodyArrayBuffer = bufferClone(body)\n    } else {\n      this._bodyText = body = Object.prototype.toString.call(body)\n    }\n\n    if (!this.headers.get('content-type')) {\n      if (typeof body === 'string') {\n        this.headers.set('content-type', 'text/plain;charset=UTF-8')\n      } else if (this._bodyBlob && this._bodyBlob.type) {\n        this.headers.set('content-type', this._bodyBlob.type)\n      } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {\n        this.headers.set('content-type', 'application/x-www-form-urlencoded;charset=UTF-8')\n      }\n    }\n  }\n\n  if (support.blob) {\n    this.blob = function() {\n      var rejected = consumed(this)\n      if (rejected) {\n        return rejected\n      }\n\n      if (this._bodyBlob) {\n        return Promise.resolve(this._bodyBlob)\n      } else if (this._bodyArrayBuffer) {\n        return Promise.resolve(new Blob([this._bodyArrayBuffer]))\n      } else if (this._bodyFormData) {\n        throw new Error('could not read FormData body as blob')\n      } else {\n        return Promise.resolve(new Blob([this._bodyText]))\n      }\n    }\n\n    this.arrayBuffer = function() {\n      if (this._bodyArrayBuffer) {\n        return consumed(this) || Promise.resolve(this._bodyArrayBuffer)\n      } else {\n        return this.blob().then(readBlobAsArrayBuffer)\n      }\n    }\n  }\n\n  this.text = function() {\n    var rejected = consumed(this)\n    if (rejected) {\n      return rejected\n    }\n\n    if (this._bodyBlob) {\n      return readBlobAsText(this._bodyBlob)\n    } else if (this._bodyArrayBuffer) {\n      return Promise.resolve(readArrayBufferAsText(this._bodyArrayBuffer))\n    } else if (this._bodyFormData) {\n      throw new Error('could not read FormData body as text')\n    } else {\n      return Promise.resolve(this._bodyText)\n    }\n  }\n\n  if (support.formData) {\n    this.formData = function() {\n      return this.text().then(decode)\n    }\n  }\n\n  this.json = function() {\n    return this.text().then(JSON.parse)\n  }\n\n  return this\n}\n\n// HTTP methods whose capitalization should be normalized\nvar methods = ['DELETE', 'GET', 'HEAD', 'OPTIONS', 'POST', 'PUT']\n\nfunction normalizeMethod(method) {\n  var upcased = method.toUpperCase()\n  return methods.indexOf(upcased) > -1 ? upcased : method\n}\n\nexport function Request(input, options) {\n  options = options || {}\n  var body = options.body\n\n  if (input instanceof Request) {\n    if (input.bodyUsed) {\n      throw new TypeError('Already read')\n    }\n    this.url = input.url\n    this.credentials = input.credentials\n    if (!options.headers) {\n      this.headers = new Headers(input.headers)\n    }\n    this.method = input.method\n    this.mode = input.mode\n    this.signal = input.signal\n    if (!body && input._bodyInit != null) {\n      body = input._bodyInit\n      input.bodyUsed = true\n    }\n  } else {\n    this.url = String(input)\n  }\n\n  this.credentials = options.credentials || this.credentials || 'same-origin'\n  if (options.headers || !this.headers) {\n    this.headers = new Headers(options.headers)\n  }\n  this.method = normalizeMethod(options.method || this.method || 'GET')\n  this.mode = options.mode || this.mode || null\n  this.signal = options.signal || this.signal\n  this.referrer = null\n\n  if ((this.method === 'GET' || this.method === 'HEAD') && body) {\n    throw new TypeError('Body not allowed for GET or HEAD requests')\n  }\n  this._initBody(body)\n}\n\nRequest.prototype.clone = function() {\n  return new Request(this, {body: this._bodyInit})\n}\n\nfunction decode(body) {\n  var form = new FormData()\n  body\n    .trim()\n    .split('&')\n    .forEach(function(bytes) {\n      if (bytes) {\n        var split = bytes.split('=')\n        var name = split.shift().replace(/\\+/g, ' ')\n        var value = split.join('=').replace(/\\+/g, ' ')\n        form.append(decodeURIComponent(name), decodeURIComponent(value))\n      }\n    })\n  return form\n}\n\nfunction parseHeaders(rawHeaders) {\n  var headers = new Headers()\n  // Replace instances of \\r\\n and \\n followed by at least one space or horizontal tab with a space\n  // https://tools.ietf.org/html/rfc7230#section-3.2\n  var preProcessedHeaders = rawHeaders.replace(/\\r?\\n[\\t ]+/g, ' ')\n  preProcessedHeaders.split(/\\r?\\n/).forEach(function(line) {\n    var parts = line.split(':')\n    var key = parts.shift().trim()\n    if (key) {\n      var value = parts.join(':').trim()\n      headers.append(key, value)\n    }\n  })\n  return headers\n}\n\nBody.call(Request.prototype)\n\nexport function Response(bodyInit, options) {\n  if (!options) {\n    options = {}\n  }\n\n  this.type = 'default'\n  this.status = options.status === undefined ? 200 : options.status\n  this.ok = this.status >= 200 && this.status < 300\n  this.statusText = 'statusText' in options ? options.statusText : 'OK'\n  this.headers = new Headers(options.headers)\n  this.url = options.url || ''\n  this._initBody(bodyInit)\n}\n\nBody.call(Response.prototype)\n\nResponse.prototype.clone = function() {\n  return new Response(this._bodyInit, {\n    status: this.status,\n    statusText: this.statusText,\n    headers: new Headers(this.headers),\n    url: this.url\n  })\n}\n\nResponse.error = function() {\n  var response = new Response(null, {status: 0, statusText: ''})\n  response.type = 'error'\n  return response\n}\n\nvar redirectStatuses = [301, 302, 303, 307, 308]\n\nResponse.redirect = function(url, status) {\n  if (redirectStatuses.indexOf(status) === -1) {\n    throw new RangeError('Invalid status code')\n  }\n\n  return new Response(null, {status: status, headers: {location: url}})\n}\n\nexport var DOMException = self.DOMException\ntry {\n  new DOMException()\n} catch (err) {\n  DOMException = function(message, name) {\n    this.message = message\n    this.name = name\n    var error = Error(message)\n    this.stack = error.stack\n  }\n  DOMException.prototype = Object.create(Error.prototype)\n  DOMException.prototype.constructor = DOMException\n}\n\nexport function fetch(input, init) {\n  return new Promise(function(resolve, reject) {\n    var request = new Request(input, init)\n\n    if (request.signal && request.signal.aborted) {\n      return reject(new DOMException('Aborted', 'AbortError'))\n    }\n\n    var xhr = new XMLHttpRequest()\n\n    function abortXhr() {\n      xhr.abort()\n    }\n\n    xhr.onload = function() {\n      var options = {\n        status: xhr.status,\n        statusText: xhr.statusText,\n        headers: parseHeaders(xhr.getAllResponseHeaders() || '')\n      }\n      options.url = 'responseURL' in xhr ? xhr.responseURL : options.headers.get('X-Request-URL')\n      var body = 'response' in xhr ? xhr.response : xhr.responseText\n      resolve(new Response(body, options))\n    }\n\n    xhr.onerror = function() {\n      reject(new TypeError('Network request failed'))\n    }\n\n    xhr.ontimeout = function() {\n      reject(new TypeError('Network request failed'))\n    }\n\n    xhr.onabort = function() {\n      reject(new DOMException('Aborted', 'AbortError'))\n    }\n\n    xhr.open(request.method, request.url, true)\n\n    if (request.credentials === 'include') {\n      xhr.withCredentials = true\n    } else if (request.credentials === 'omit') {\n      xhr.withCredentials = false\n    }\n\n    if ('responseType' in xhr && support.blob) {\n      xhr.responseType = 'blob'\n    }\n\n    request.headers.forEach(function(value, name) {\n      xhr.setRequestHeader(name, value)\n    })\n\n    if (request.signal) {\n      request.signal.addEventListener('abort', abortXhr)\n\n      xhr.onreadystatechange = function() {\n        // DONE (success or failure)\n        if (xhr.readyState === 4) {\n          request.signal.removeEventListener('abort', abortXhr)\n        }\n      }\n    }\n\n    xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit)\n  })\n}\n\nfetch.polyfill = true\n\nif (!self.fetch) {\n  self.fetch = fetch\n  self.Headers = Headers\n  self.Request = Request\n  self.Response = Response\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/**\n * A local reference to the document.\n */\nvar document = window.document;\n\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 (options.root && options.root.nodeType != 1) {\n    throw new Error('root must be an 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  if (doc != (this.root && this.root.ownerDocument || document)) {\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 = (this.root && this.root.ownerDocument || 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 newEntry = item.entry = new IntersectionObserverEntry({\n      time: now(),\n      target: target,\n      boundingClientRect: targetRect,\n      rootBounds: crossOriginUpdater && !this.root ? null : rootRect,\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) {\n    rootRect = getBoundingClientRect(this.root);\n  } else {\n    // Use <html>/<body> instead of window since scroll bars affect size.\n    var html = document.documentElement;\n    var body = document.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  return containsDeep(this.root || document, target) &&\n    (!this.root || this.root.ownerDocument == target.ownerDocument);\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, 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