@angular/platform-browser/fesm2020/platform-browser.mjs.map

Angular - library for using Angular in a web browser

{"version":3,"file":"platform-browser.mjs","sources":["../../../../../../packages/platform-browser/src/browser/generic_browser_adapter.ts","../../../../../../packages/platform-browser/src/browser/browser_adapter.ts","../../../../../../packages/platform-browser/src/browser/server-transition.ts","../../../../../../packages/platform-browser/src/browser/testability.ts","../../../../../../packages/platform-browser/src/browser/xhr.ts","../../../../../../packages/platform-browser/src/dom/events/event_manager.ts","../../../../../../packages/platform-browser/src/dom/shared_styles_host.ts","../../../../../../packages/platform-browser/src/dom/dom_renderer.ts","../../../../../../packages/platform-browser/src/dom/events/dom_events.ts","../../../../../../packages/platform-browser/src/dom/events/key_events.ts","../../../../../../packages/platform-browser/src/browser.ts","../../../../../../packages/platform-browser/src/browser/meta.ts","../../../../../../packages/platform-browser/src/browser/title.ts","../../../../../../packages/platform-browser/src/dom/util.ts","../../../../../../packages/platform-browser/src/browser/tools/browser.ts","../../../../../../packages/platform-browser/src/browser/tools/common_tools.ts","../../../../../../packages/platform-browser/src/browser/tools/tools.ts","../../../../../../packages/platform-browser/src/browser/transfer_state.ts","../../../../../../packages/platform-browser/src/dom/debug/by.ts","../../../../../../packages/platform-browser/src/dom/events/hammer_gestures.ts","../../../../../../packages/platform-browser/src/security/dom_sanitization_service.ts","../../../../../../packages/platform-browser/src/private_export.ts","../../../../../../packages/platform-browser/src/version.ts","../../../../../../packages/platform-browser/src/platform-browser.ts","../../../../../../packages/platform-browser/public_api.ts","../../../../../../packages/platform-browser/index.ts","../../../../../../packages/platform-browser/platform-browser.ts"],"sourcesContent":["/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ɵDomAdapter as DomAdapter} from '@angular/common';\n\n\n\n/**\n * Provides DOM operations in any browser environment.\n *\n * @security Tread carefully! Interacting with the DOM directly is dangerous and\n * can introduce XSS risks.\n */\nexport abstract class GenericBrowserDomAdapter extends DomAdapter {\n  readonly supportsDOMEvents: boolean = true;\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ɵparseCookieValue as parseCookieValue, ɵsetRootDomAdapter as setRootDomAdapter} from '@angular/common';\n\nimport {GenericBrowserDomAdapter} from './generic_browser_adapter';\n\n/**\n * A `DomAdapter` powered by full browser DOM APIs.\n *\n * @security Tread carefully! Interacting with the DOM directly is dangerous and\n * can introduce XSS risks.\n */\n/* tslint:disable:requireParameterType no-console */\nexport class BrowserDomAdapter extends GenericBrowserDomAdapter {\n  static makeCurrent() {\n    setRootDomAdapter(new BrowserDomAdapter());\n  }\n\n  onAndCancel(el: Node, evt: any, listener: any): Function {\n    el.addEventListener(evt, listener, false);\n    // Needed to follow Dart's subscription semantic, until fix of\n    // https://code.google.com/p/dart/issues/detail?id=17406\n    return () => {\n      el.removeEventListener(evt, listener, false);\n    };\n  }\n  dispatchEvent(el: Node, evt: any) {\n    el.dispatchEvent(evt);\n  }\n  remove(node: Node): void {\n    if (node.parentNode) {\n      node.parentNode.removeChild(node);\n    }\n  }\n  createElement(tagName: string, doc?: Document): HTMLElement {\n    doc = doc || this.getDefaultDocument();\n    return doc.createElement(tagName);\n  }\n  createHtmlDocument(): HTMLDocument {\n    return document.implementation.createHTMLDocument('fakeTitle');\n  }\n  getDefaultDocument(): Document {\n    return document;\n  }\n\n  isElementNode(node: Node): boolean {\n    return node.nodeType === Node.ELEMENT_NODE;\n  }\n\n  isShadowRoot(node: any): boolean {\n    return node instanceof DocumentFragment;\n  }\n\n  /** @deprecated No longer being used in Ivy code. To be removed in version 14. */\n  getGlobalEventTarget(doc: Document, target: string): EventTarget|null {\n    if (target === 'window') {\n      return window;\n    }\n    if (target === 'document') {\n      return doc;\n    }\n    if (target === 'body') {\n      return doc.body;\n    }\n    return null;\n  }\n  getBaseHref(doc: Document): string|null {\n    const href = getBaseElementHref();\n    return href == null ? null : relativePath(href);\n  }\n  resetBaseElement(): void {\n    baseElement = null;\n  }\n  getUserAgent(): string {\n    return window.navigator.userAgent;\n  }\n  getCookie(name: string): string|null {\n    return parseCookieValue(document.cookie, name);\n  }\n}\n\nlet baseElement: HTMLElement|null = null;\nfunction getBaseElementHref(): string|null {\n  baseElement = baseElement || document.querySelector('base');\n  return baseElement ? baseElement.getAttribute('href') : null;\n}\n\n// based on urlUtils.js in AngularJS 1\nlet urlParsingNode: HTMLAnchorElement|undefined;\nfunction relativePath(url: any): string {\n  urlParsingNode = urlParsingNode || document.createElement('a');\n  urlParsingNode.setAttribute('href', url);\n  const pathName = urlParsingNode.pathname;\n  return pathName.charAt(0) === '/' ? pathName : `/${pathName}`;\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {DOCUMENT, ɵgetDOM as getDOM} from '@angular/common';\nimport {APP_INITIALIZER, ApplicationInitStatus, InjectionToken, Injector, StaticProvider} from '@angular/core';\n\n/**\n * An id that identifies a particular application being bootstrapped, that should\n * match across the client/server boundary.\n */\nexport const TRANSITION_ID = new InjectionToken('TRANSITION_ID');\n\nexport function appInitializerFactory(transitionId: string, document: any, injector: Injector) {\n  return () => {\n    // Wait for all application initializers to be completed before removing the styles set by\n    // the server.\n    injector.get(ApplicationInitStatus).donePromise.then(() => {\n      const dom = getDOM();\n      const styles: HTMLCollectionOf<HTMLStyleElement> =\n          document.querySelectorAll(`style[ng-transition=\"${transitionId}\"]`);\n      for (let i = 0; i < styles.length; i++) {\n        dom.remove(styles[i]);\n      }\n    });\n  };\n}\n\nexport const SERVER_TRANSITION_PROVIDERS: StaticProvider[] = [\n  {\n    provide: APP_INITIALIZER,\n    useFactory: appInitializerFactory,\n    deps: [TRANSITION_ID, DOCUMENT, Injector],\n    multi: true\n  },\n];\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ɵgetDOM as getDOM} from '@angular/common';\nimport {GetTestability, setTestabilityGetter, Testability, TestabilityRegistry, ɵglobal as global} from '@angular/core';\n\nexport class BrowserGetTestability implements GetTestability {\n  static init() {\n    setTestabilityGetter(new BrowserGetTestability());\n  }\n\n  addToWindow(registry: TestabilityRegistry): void {\n    global['getAngularTestability'] = (elem: any, findInAncestors: boolean = true) => {\n      const testability = registry.findTestabilityInTree(elem, findInAncestors);\n      if (testability == null) {\n        throw new Error('Could not find testability for element.');\n      }\n      return testability;\n    };\n\n    global['getAllAngularTestabilities'] = () => registry.getAllTestabilities();\n\n    global['getAllAngularRootElements'] = () => registry.getAllRootElements();\n\n    const whenAllStable = (callback: any /** TODO #9100 */) => {\n      const testabilities = global['getAllAngularTestabilities']();\n      let count = testabilities.length;\n      let didWork = false;\n      const decrement = function(didWork_: any /** TODO #9100 */) {\n        didWork = didWork || didWork_;\n        count--;\n        if (count == 0) {\n          callback(didWork);\n        }\n      };\n      testabilities.forEach(function(testability: any /** TODO #9100 */) {\n        testability.whenStable(decrement);\n      });\n    };\n\n    if (!global['frameworkStabilizers']) {\n      global['frameworkStabilizers'] = [];\n    }\n    global['frameworkStabilizers'].push(whenAllStable);\n  }\n\n  findTestabilityInTree(registry: TestabilityRegistry, elem: any, findInAncestors: boolean):\n      Testability|null {\n    if (elem == null) {\n      return null;\n    }\n    const t = registry.getTestability(elem);\n    if (t != null) {\n      return t;\n    } else if (!findInAncestors) {\n      return null;\n    }\n    if (getDOM().isShadowRoot(elem)) {\n      return this.findTestabilityInTree(registry, (<any>elem).host, true);\n    }\n    return this.findTestabilityInTree(registry, elem.parentElement, true);\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {XhrFactory} from '@angular/common';\nimport {Injectable} from '@angular/core';\n\n/**\n * A factory for `HttpXhrBackend` that uses the `XMLHttpRequest` browser API.\n */\n@Injectable()\nexport class BrowserXhr implements XhrFactory {\n  build(): XMLHttpRequest {\n    return new XMLHttpRequest();\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ɵgetDOM as getDOM} from '@angular/common';\nimport {Inject, Injectable, InjectionToken, NgZone} from '@angular/core';\n\n/**\n * The injection token for the event-manager plug-in service.\n *\n * @publicApi\n */\nexport const EVENT_MANAGER_PLUGINS =\n    new InjectionToken<EventManagerPlugin[]>('EventManagerPlugins');\n\n/**\n * An injectable service that provides event management for Angular\n * through a browser plug-in.\n *\n * @publicApi\n */\n@Injectable()\nexport class EventManager {\n  private _plugins: EventManagerPlugin[];\n  private _eventNameToPlugin = new Map<string, EventManagerPlugin>();\n\n  /**\n   * Initializes an instance of the event-manager service.\n   */\n  constructor(@Inject(EVENT_MANAGER_PLUGINS) plugins: EventManagerPlugin[], private _zone: NgZone) {\n    plugins.forEach(p => p.manager = this);\n    this._plugins = plugins.slice().reverse();\n  }\n\n  /**\n   * Registers a handler for a specific element and event.\n   *\n   * @param element The HTML element to receive event notifications.\n   * @param eventName The name of the event to listen for.\n   * @param handler A function to call when the notification occurs. Receives the\n   * event object as an argument.\n   * @returns  A callback function that can be used to remove the handler.\n   */\n  addEventListener(element: HTMLElement, eventName: string, handler: Function): Function {\n    const plugin = this._findPluginFor(eventName);\n    return plugin.addEventListener(element, eventName, handler);\n  }\n\n  /**\n   * Registers a global handler for an event in a target view.\n   *\n   * @param target A target for global event notifications. One of \"window\", \"document\", or \"body\".\n   * @param eventName The name of the event to listen for.\n   * @param handler A function to call when the notification occurs. Receives the\n   * event object as an argument.\n   * @returns A callback function that can be used to remove the handler.\n   * @deprecated No longer being used in Ivy code. To be removed in version 14.\n   */\n  addGlobalEventListener(target: string, eventName: string, handler: Function): Function {\n    const plugin = this._findPluginFor(eventName);\n    return plugin.addGlobalEventListener(target, eventName, handler);\n  }\n\n  /**\n   * Retrieves the compilation zone in which event listeners are registered.\n   */\n  getZone(): NgZone {\n    return this._zone;\n  }\n\n  /** @internal */\n  _findPluginFor(eventName: string): EventManagerPlugin {\n    const plugin = this._eventNameToPlugin.get(eventName);\n    if (plugin) {\n      return plugin;\n    }\n\n    const plugins = this._plugins;\n    for (let i = 0; i < plugins.length; i++) {\n      const plugin = plugins[i];\n      if (plugin.supports(eventName)) {\n        this._eventNameToPlugin.set(eventName, plugin);\n        return plugin;\n      }\n    }\n    throw new Error(`No event manager plugin found for event ${eventName}`);\n  }\n}\n\nexport abstract class EventManagerPlugin {\n  constructor(private _doc: any) {}\n\n  // TODO(issue/24571): remove '!'.\n  manager!: EventManager;\n\n  abstract supports(eventName: string): boolean;\n\n  abstract addEventListener(element: HTMLElement, eventName: string, handler: Function): Function;\n\n  addGlobalEventListener(element: string, eventName: string, handler: Function): Function {\n    const target: HTMLElement = getDOM().getGlobalEventTarget(this._doc, element);\n    if (!target) {\n      throw new Error(`Unsupported event target ${target} for event ${eventName}`);\n    }\n    return this.addEventListener(target, eventName, handler);\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {DOCUMENT, ɵgetDOM as getDOM} from '@angular/common';\nimport {Inject, Injectable, OnDestroy} from '@angular/core';\n\n@Injectable()\nexport class SharedStylesHost {\n  /** @internal */\n  protected _stylesSet = new Set<string>();\n\n  addStyles(styles: string[]): void {\n    const additions = new Set<string>();\n    styles.forEach(style => {\n      if (!this._stylesSet.has(style)) {\n        this._stylesSet.add(style);\n        additions.add(style);\n      }\n    });\n    this.onStylesAdded(additions);\n  }\n\n  onStylesAdded(additions: Set<string>): void {}\n\n  getAllStyles(): string[] {\n    return Array.from(this._stylesSet);\n  }\n}\n\n@Injectable()\nexport class DomSharedStylesHost extends SharedStylesHost implements OnDestroy {\n  // Maps all registered host nodes to a list of style nodes that have been added to the host node.\n  private _hostNodes = new Map<Node, Node[]>();\n\n  constructor(@Inject(DOCUMENT) private _doc: any) {\n    super();\n    this._hostNodes.set(_doc.head, []);\n  }\n\n  private _addStylesToHost(styles: Set<string>, host: Node, styleNodes: Node[]): void {\n    styles.forEach((style: string) => {\n      const styleEl = this._doc.createElement('style');\n      styleEl.textContent = style;\n      styleNodes.push(host.appendChild(styleEl));\n    });\n  }\n\n  addHost(hostNode: Node): void {\n    const styleNodes: Node[] = [];\n    this._addStylesToHost(this._stylesSet, hostNode, styleNodes);\n    this._hostNodes.set(hostNode, styleNodes);\n  }\n\n  removeHost(hostNode: Node): void {\n    const styleNodes = this._hostNodes.get(hostNode);\n    if (styleNodes) {\n      styleNodes.forEach(removeStyle);\n    }\n    this._hostNodes.delete(hostNode);\n  }\n\n  override onStylesAdded(additions: Set<string>): void {\n    this._hostNodes.forEach((styleNodes, hostNode) => {\n      this._addStylesToHost(additions, hostNode, styleNodes);\n    });\n  }\n\n  ngOnDestroy(): void {\n    this._hostNodes.forEach(styleNodes => styleNodes.forEach(removeStyle));\n  }\n}\n\nfunction removeStyle(styleNode: Node): void {\n  getDOM().remove(styleNode);\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {APP_ID, Inject, Injectable, Renderer2, RendererFactory2, RendererStyleFlags2, RendererType2, ViewEncapsulation} from '@angular/core';\n\nimport {EventManager} from './events/event_manager';\nimport {DomSharedStylesHost} from './shared_styles_host';\n\nexport const NAMESPACE_URIS: {[ns: string]: string} = {\n  'svg': 'http://www.w3.org/2000/svg',\n  'xhtml': 'http://www.w3.org/1999/xhtml',\n  'xlink': 'http://www.w3.org/1999/xlink',\n  'xml': 'http://www.w3.org/XML/1998/namespace',\n  'xmlns': 'http://www.w3.org/2000/xmlns/',\n};\n\nconst COMPONENT_REGEX = /%COMP%/g;\nconst NG_DEV_MODE = typeof ngDevMode === 'undefined' || !!ngDevMode;\n\nexport const COMPONENT_VARIABLE = '%COMP%';\nexport const HOST_ATTR = `_nghost-${COMPONENT_VARIABLE}`;\nexport const CONTENT_ATTR = `_ngcontent-${COMPONENT_VARIABLE}`;\n\nexport function shimContentAttribute(componentShortId: string): string {\n  return CONTENT_ATTR.replace(COMPONENT_REGEX, componentShortId);\n}\n\nexport function shimHostAttribute(componentShortId: string): string {\n  return HOST_ATTR.replace(COMPONENT_REGEX, componentShortId);\n}\n\nexport function flattenStyles(\n    compId: string, styles: Array<any|any[]>, target: string[]): string[] {\n  for (let i = 0; i < styles.length; i++) {\n    let style = styles[i];\n\n    if (Array.isArray(style)) {\n      flattenStyles(compId, style, target);\n    } else {\n      style = style.replace(COMPONENT_REGEX, compId);\n      target.push(style);\n    }\n  }\n  return target;\n}\n\nfunction decoratePreventDefault(eventHandler: Function): Function {\n  // `DebugNode.triggerEventHandler` needs to know if the listener was created with\n  // decoratePreventDefault or is a listener added outside the Angular context so it can handle the\n  // two differently. In the first case, the special '__ngUnwrap__' token is passed to the unwrap\n  // the listener (see below).\n  return (event: any) => {\n    // Ivy uses '__ngUnwrap__' as a special token that allows us to unwrap the function\n    // so that it can be invoked programmatically by `DebugNode.triggerEventHandler`. The debug_node\n    // can inspect the listener toString contents for the existence of this special token. Because\n    // the token is a string literal, it is ensured to not be modified by compiled code.\n    if (event === '__ngUnwrap__') {\n      return eventHandler;\n    }\n\n    const allowDefaultBehavior = eventHandler(event);\n    if (allowDefaultBehavior === false) {\n      // TODO(tbosch): move preventDefault into event plugins...\n      event.preventDefault();\n      event.returnValue = false;\n    }\n\n    return undefined;\n  };\n}\n\nlet hasLoggedNativeEncapsulationWarning = false;\n\n@Injectable()\nexport class DomRendererFactory2 implements RendererFactory2 {\n  private rendererByCompId = new Map<string, Renderer2>();\n  private defaultRenderer: Renderer2;\n\n  constructor(\n      private eventManager: EventManager, private sharedStylesHost: DomSharedStylesHost,\n      @Inject(APP_ID) private appId: string) {\n    this.defaultRenderer = new DefaultDomRenderer2(eventManager);\n  }\n\n  createRenderer(element: any, type: RendererType2|null): Renderer2 {\n    if (!element || !type) {\n      return this.defaultRenderer;\n    }\n    switch (type.encapsulation) {\n      case ViewEncapsulation.Emulated: {\n        let renderer = this.rendererByCompId.get(type.id);\n        if (!renderer) {\n          renderer = new EmulatedEncapsulationDomRenderer2(\n              this.eventManager, this.sharedStylesHost, type, this.appId);\n          this.rendererByCompId.set(type.id, renderer);\n        }\n        (<EmulatedEncapsulationDomRenderer2>renderer).applyToHost(element);\n        return renderer;\n      }\n      // @ts-ignore TODO: Remove as part of FW-2290. TS complains about us dealing with an enum\n      // value that is not known (but previously was the value for ViewEncapsulation.Native)\n      case 1:\n      case ViewEncapsulation.ShadowDom:\n        // TODO(FW-2290): remove the `case 1:` fallback logic and the warning in v12.\n        if ((typeof ngDevMode === 'undefined' || ngDevMode) &&\n            // @ts-ignore TODO: Remove as part of FW-2290. TS complains about us dealing with an\n            // enum value that is not known (but previously was the value for\n            // ViewEncapsulation.Native)\n            !hasLoggedNativeEncapsulationWarning && type.encapsulation === 1) {\n          hasLoggedNativeEncapsulationWarning = true;\n          console.warn(\n              'ViewEncapsulation.Native is no longer supported. Falling back to ViewEncapsulation.ShadowDom. The fallback will be removed in v12.');\n        }\n\n        return new ShadowDomRenderer(this.eventManager, this.sharedStylesHost, element, type);\n      default: {\n        if (!this.rendererByCompId.has(type.id)) {\n          const styles = flattenStyles(type.id, type.styles, []);\n          this.sharedStylesHost.addStyles(styles);\n          this.rendererByCompId.set(type.id, this.defaultRenderer);\n        }\n        return this.defaultRenderer;\n      }\n    }\n  }\n\n  begin() {}\n  end() {}\n}\n\nclass DefaultDomRenderer2 implements Renderer2 {\n  data: {[key: string]: any} = Object.create(null);\n\n  constructor(private eventManager: EventManager) {}\n\n  destroy(): void {}\n\n  destroyNode = null;\n\n  createElement(name: string, namespace?: string): any {\n    if (namespace) {\n      // In cases where Ivy (not ViewEngine) is giving us the actual namespace, the look up by key\n      // will result in undefined, so we just return the namespace here.\n      return document.createElementNS(NAMESPACE_URIS[namespace] || namespace, name);\n    }\n\n    return document.createElement(name);\n  }\n\n  createComment(value: string): any {\n    return document.createComment(value);\n  }\n\n  createText(value: string): any {\n    return document.createTextNode(value);\n  }\n\n  appendChild(parent: any, newChild: any): void {\n    parent.appendChild(newChild);\n  }\n\n  insertBefore(parent: any, newChild: any, refChild: any): void {\n    if (parent) {\n      parent.insertBefore(newChild, refChild);\n    }\n  }\n\n  removeChild(parent: any, oldChild: any): void {\n    if (parent) {\n      parent.removeChild(oldChild);\n    }\n  }\n\n  selectRootElement(selectorOrNode: string|any, preserveContent?: boolean): any {\n    let el: any = typeof selectorOrNode === 'string' ? document.querySelector(selectorOrNode) :\n                                                       selectorOrNode;\n    if (!el) {\n      throw new Error(`The selector \"${selectorOrNode}\" did not match any elements`);\n    }\n    if (!preserveContent) {\n      el.textContent = '';\n    }\n    return el;\n  }\n\n  parentNode(node: any): any {\n    return node.parentNode;\n  }\n\n  nextSibling(node: any): any {\n    return node.nextSibling;\n  }\n\n  setAttribute(el: any, name: string, value: string, namespace?: string): void {\n    if (namespace) {\n      name = namespace + ':' + name;\n      // TODO(FW-811): Ivy may cause issues here because it's passing around\n      // full URIs for namespaces, therefore this lookup will fail.\n      const namespaceUri = NAMESPACE_URIS[namespace];\n      if (namespaceUri) {\n        el.setAttributeNS(namespaceUri, name, value);\n      } else {\n        el.setAttribute(name, value);\n      }\n    } else {\n      el.setAttribute(name, value);\n    }\n  }\n\n  removeAttribute(el: any, name: string, namespace?: string): void {\n    if (namespace) {\n      // TODO(FW-811): Ivy may cause issues here because it's passing around\n      // full URIs for namespaces, therefore this lookup will fail.\n      const namespaceUri = NAMESPACE_URIS[namespace];\n      if (namespaceUri) {\n        el.removeAttributeNS(namespaceUri, name);\n      } else {\n        // TODO(FW-811): Since ivy is passing around full URIs for namespaces\n        // this could result in properties like `http://www.w3.org/2000/svg:cx=\"123\"`,\n        // which is wrong.\n        el.removeAttribute(`${namespace}:${name}`);\n      }\n    } else {\n      el.removeAttribute(name);\n    }\n  }\n\n  addClass(el: any, name: string): void {\n    el.classList.add(name);\n  }\n\n  removeClass(el: any, name: string): void {\n    el.classList.remove(name);\n  }\n\n  setStyle(el: any, style: string, value: any, flags: RendererStyleFlags2): void {\n    if (flags & (RendererStyleFlags2.DashCase | RendererStyleFlags2.Important)) {\n      el.style.setProperty(style, value, flags & RendererStyleFlags2.Important ? 'important' : '');\n    } else {\n      el.style[style] = value;\n    }\n  }\n\n  removeStyle(el: any, style: string, flags: RendererStyleFlags2): void {\n    if (flags & RendererStyleFlags2.DashCase) {\n      el.style.removeProperty(style);\n    } else {\n      // IE requires '' instead of null\n      // see https://github.com/angular/angular/issues/7916\n      el.style[style] = '';\n    }\n  }\n\n  setProperty(el: any, name: string, value: any): void {\n    NG_DEV_MODE && checkNoSyntheticProp(name, 'property');\n    el[name] = value;\n  }\n\n  setValue(node: any, value: string): void {\n    node.nodeValue = value;\n  }\n\n  listen(target: 'window'|'document'|'body'|any, event: string, callback: (event: any) => boolean):\n      () => void {\n    NG_DEV_MODE && checkNoSyntheticProp(event, 'listener');\n    if (typeof target === 'string') {\n      return <() => void>this.eventManager.addGlobalEventListener(\n          target, event, decoratePreventDefault(callback));\n    }\n    return <() => void>this.eventManager.addEventListener(\n               target, event, decoratePreventDefault(callback)) as () => void;\n  }\n}\n\nconst AT_CHARCODE = (() => '@'.charCodeAt(0))();\nfunction checkNoSyntheticProp(name: string, nameKind: string) {\n  if (name.charCodeAt(0) === AT_CHARCODE) {\n    throw new Error(`Unexpected synthetic ${nameKind} ${name} found. Please make sure that:\n  - Either \\`BrowserAnimationsModule\\` or \\`NoopAnimationsModule\\` are imported in your application.\n  - There is corresponding configuration for the animation named \\`${\n        name}\\` defined in the \\`animations\\` field of the \\`@Component\\` decorator (see https://angular.io/api/core/Component#animations).`);\n  }\n}\n\nclass EmulatedEncapsulationDomRenderer2 extends DefaultDomRenderer2 {\n  private contentAttr: string;\n  private hostAttr: string;\n\n  constructor(\n      eventManager: EventManager, sharedStylesHost: DomSharedStylesHost,\n      private component: RendererType2, appId: string) {\n    super(eventManager);\n    const styles = flattenStyles(appId + '-' + component.id, component.styles, []);\n    sharedStylesHost.addStyles(styles);\n\n    this.contentAttr = shimContentAttribute(appId + '-' + component.id);\n    this.hostAttr = shimHostAttribute(appId + '-' + component.id);\n  }\n\n  applyToHost(element: any) {\n    super.setAttribute(element, this.hostAttr, '');\n  }\n\n  override createElement(parent: any, name: string): Element {\n    const el = super.createElement(parent, name);\n    super.setAttribute(el, this.contentAttr, '');\n    return el;\n  }\n}\n\nclass ShadowDomRenderer extends DefaultDomRenderer2 {\n  private shadowRoot: any;\n\n  constructor(\n      eventManager: EventManager, private sharedStylesHost: DomSharedStylesHost,\n      private hostEl: any, component: RendererType2) {\n    super(eventManager);\n    this.shadowRoot = (hostEl as any).attachShadow({mode: 'open'});\n    this.sharedStylesHost.addHost(this.shadowRoot);\n    const styles = flattenStyles(component.id, component.styles, []);\n    for (let i = 0; i < styles.length; i++) {\n      const styleEl = document.createElement('style');\n      styleEl.textContent = styles[i];\n      this.shadowRoot.appendChild(styleEl);\n    }\n  }\n\n  private nodeOrShadowRoot(node: any): any {\n    return node === this.hostEl ? this.shadowRoot : node;\n  }\n\n  override destroy() {\n    this.sharedStylesHost.removeHost(this.shadowRoot);\n  }\n\n  override appendChild(parent: any, newChild: any): void {\n    return super.appendChild(this.nodeOrShadowRoot(parent), newChild);\n  }\n  override insertBefore(parent: any, newChild: any, refChild: any): void {\n    return super.insertBefore(this.nodeOrShadowRoot(parent), newChild, refChild);\n  }\n  override removeChild(parent: any, oldChild: any): void {\n    return super.removeChild(this.nodeOrShadowRoot(parent), oldChild);\n  }\n  override parentNode(node: any): any {\n    return this.nodeOrShadowRoot(super.parentNode(this.nodeOrShadowRoot(node)));\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable} from '@angular/core';\n\nimport {EventManagerPlugin} from './event_manager';\n\n@Injectable()\nexport class DomEventsPlugin extends EventManagerPlugin {\n  constructor(@Inject(DOCUMENT) doc: any) {\n    super(doc);\n  }\n\n  // This plugin should come last in the list of plugins, because it accepts all\n  // events.\n  override supports(eventName: string): boolean {\n    return true;\n  }\n\n  override addEventListener(element: HTMLElement, eventName: string, handler: Function): Function {\n    element.addEventListener(eventName, handler as EventListener, false);\n    return () => this.removeEventListener(element, eventName, handler as EventListener);\n  }\n\n  removeEventListener(target: any, eventName: string, callback: Function): void {\n    return target.removeEventListener(eventName, callback as EventListener);\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {DOCUMENT, ɵgetDOM as getDOM} from '@angular/common';\nimport {Inject, Injectable, NgZone} from '@angular/core';\nimport {EventManagerPlugin} from './event_manager';\n\n/**\n * Defines supported modifiers for key events.\n */\nconst MODIFIER_KEYS = ['alt', 'control', 'meta', 'shift'];\n\nconst DOM_KEY_LOCATION_NUMPAD = 3;\n\n// Map to convert some key or keyIdentifier values to what will be returned by getEventKey\nconst _keyMap: {[k: string]: string} = {\n  // The following values are here for cross-browser compatibility and to match the W3C standard\n  // cf https://www.w3.org/TR/DOM-Level-3-Events-key/\n  '\\b': 'Backspace',\n  '\\t': 'Tab',\n  '\\x7F': 'Delete',\n  '\\x1B': 'Escape',\n  'Del': 'Delete',\n  'Esc': 'Escape',\n  'Left': 'ArrowLeft',\n  'Right': 'ArrowRight',\n  'Up': 'ArrowUp',\n  'Down': 'ArrowDown',\n  'Menu': 'ContextMenu',\n  'Scroll': 'ScrollLock',\n  'Win': 'OS'\n};\n\n// There is a bug in Chrome for numeric keypad keys:\n// https://code.google.com/p/chromium/issues/detail?id=155654\n// 1, 2, 3 ... are reported as A, B, C ...\nconst _chromeNumKeyPadMap = {\n  'A': '1',\n  'B': '2',\n  'C': '3',\n  'D': '4',\n  'E': '5',\n  'F': '6',\n  'G': '7',\n  'H': '8',\n  'I': '9',\n  'J': '*',\n  'K': '+',\n  'M': '-',\n  'N': '.',\n  'O': '/',\n  '\\x60': '0',\n  '\\x90': 'NumLock'\n};\n\n\n/**\n * Retrieves modifiers from key-event objects.\n */\nconst MODIFIER_KEY_GETTERS: {[key: string]: (event: KeyboardEvent) => boolean} = {\n  'alt': (event: KeyboardEvent) => event.altKey,\n  'control': (event: KeyboardEvent) => event.ctrlKey,\n  'meta': (event: KeyboardEvent) => event.metaKey,\n  'shift': (event: KeyboardEvent) => event.shiftKey\n};\n\n/**\n * @publicApi\n * A browser plug-in that provides support for handling of key events in Angular.\n */\n@Injectable()\nexport class KeyEventsPlugin extends EventManagerPlugin {\n  /**\n   * Initializes an instance of the browser plug-in.\n   * @param doc The document in which key events will be detected.\n   */\n  constructor(@Inject(DOCUMENT) doc: any) {\n    super(doc);\n  }\n\n  /**\n   * Reports whether a named key event is supported.\n   * @param eventName The event name to query.\n   * @return True if the named key event is supported.\n   */\n  override supports(eventName: string): boolean {\n    return KeyEventsPlugin.parseEventName(eventName) != null;\n  }\n\n  /**\n   * Registers a handler for a specific element and key event.\n   * @param element The HTML element to receive event notifications.\n   * @param eventName The name of the key event to listen for.\n   * @param handler A function to call when the notification occurs. Receives the\n   * event object as an argument.\n   * @returns The key event that was registered.\n   */\n  override addEventListener(element: HTMLElement, eventName: string, handler: Function): Function {\n    const parsedEvent = KeyEventsPlugin.parseEventName(eventName)!;\n\n    const outsideHandler =\n        KeyEventsPlugin.eventCallback(parsedEvent['fullKey'], handler, this.manager.getZone());\n\n    return this.manager.getZone().runOutsideAngular(() => {\n      return getDOM().onAndCancel(element, parsedEvent['domEventName'], outsideHandler);\n    });\n  }\n\n  static parseEventName(eventName: string): {fullKey: string, domEventName: string}|null {\n    const parts: string[] = eventName.toLowerCase().split('.');\n\n    const domEventName = parts.shift();\n    if ((parts.length === 0) || !(domEventName === 'keydown' || domEventName === 'keyup')) {\n      return null;\n    }\n\n    const key = KeyEventsPlugin._normalizeKey(parts.pop()!);\n\n    let fullKey = '';\n    MODIFIER_KEYS.forEach(modifierName => {\n      const index: number = parts.indexOf(modifierName);\n      if (index > -1) {\n        parts.splice(index, 1);\n        fullKey += modifierName + '.';\n      }\n    });\n    fullKey += key;\n\n    if (parts.length != 0 || key.length === 0) {\n      // returning null instead of throwing to let another plugin process the event\n      return null;\n    }\n\n    // NOTE: Please don't rewrite this as so, as it will break JSCompiler property renaming.\n    //       The code must remain in the `result['domEventName']` form.\n    // return {domEventName, fullKey};\n    const result: {fullKey: string, domEventName: string} = {} as any;\n    result['domEventName'] = domEventName;\n    result['fullKey'] = fullKey;\n    return result;\n  }\n\n  static getEventFullKey(event: KeyboardEvent): string {\n    let fullKey = '';\n    let key = getEventKey(event);\n    key = key.toLowerCase();\n    if (key === ' ') {\n      key = 'space';  // for readability\n    } else if (key === '.') {\n      key = 'dot';  // because '.' is used as a separator in event names\n    }\n    MODIFIER_KEYS.forEach(modifierName => {\n      if (modifierName != key) {\n        const modifierGetter = MODIFIER_KEY_GETTERS[modifierName];\n        if (modifierGetter(event)) {\n          fullKey += modifierName + '.';\n        }\n      }\n    });\n    fullKey += key;\n    return fullKey;\n  }\n\n  /**\n   * Configures a handler callback for a key event.\n   * @param fullKey The event name that combines all simultaneous keystrokes.\n   * @param handler The function that responds to the key event.\n   * @param zone The zone in which the event occurred.\n   * @returns A callback function.\n   */\n  static eventCallback(fullKey: any, handler: Function, zone: NgZone): Function {\n    return (event: any /** TODO #9100 */) => {\n      if (KeyEventsPlugin.getEventFullKey(event) === fullKey) {\n        zone.runGuarded(() => handler(event));\n      }\n    };\n  }\n\n  /** @internal */\n  static _normalizeKey(keyName: string): string {\n    // TODO: switch to a Map if the mapping grows too much\n    switch (keyName) {\n      case 'esc':\n        return 'escape';\n      default:\n        return keyName;\n    }\n  }\n}\n\nfunction getEventKey(event: any): string {\n  let key = event.key;\n  if (key == null) {\n    key = event.keyIdentifier;\n    // keyIdentifier is defined in the old draft of DOM Level 3 Events implemented by Chrome and\n    // Safari cf\n    // https://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071221/events.html#Events-KeyboardEvents-Interfaces\n    if (key == null) {\n      return 'Unidentified';\n    }\n    if (key.startsWith('U+')) {\n      key = String.fromCharCode(parseInt(key.substring(2), 16));\n      if (event.location === DOM_KEY_LOCATION_NUMPAD && _chromeNumKeyPadMap.hasOwnProperty(key)) {\n        // There is a bug in Chrome for numeric keypad keys:\n        // https://code.google.com/p/chromium/issues/detail?id=155654\n        // 1, 2, 3 ... are reported as A, B, C ...\n        key = (_chromeNumKeyPadMap as any)[key];\n      }\n    }\n  }\n\n  return _keyMap[key] || key;\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {CommonModule, DOCUMENT, XhrFactory, ɵPLATFORM_BROWSER_ID as PLATFORM_BROWSER_ID} from '@angular/common';\nimport {APP_ID, ApplicationModule, createPlatformFactory, ErrorHandler, Inject, ModuleWithProviders, NgModule, NgZone, Optional, PLATFORM_ID, PLATFORM_INITIALIZER, platformCore, PlatformRef, RendererFactory2, Sanitizer, SkipSelf, StaticProvider, Testability, ɵINJECTOR_SCOPE as INJECTOR_SCOPE, ɵsetDocument} from '@angular/core';\n\nimport {BrowserDomAdapter} from './browser/browser_adapter';\nimport {SERVER_TRANSITION_PROVIDERS, TRANSITION_ID} from './browser/server-transition';\nimport {BrowserGetTestability} from './browser/testability';\nimport {BrowserXhr} from './browser/xhr';\nimport {DomRendererFactory2} from './dom/dom_renderer';\nimport {DomEventsPlugin} from './dom/events/dom_events';\nimport {EVENT_MANAGER_PLUGINS, EventManager} from './dom/events/event_manager';\nimport {KeyEventsPlugin} from './dom/events/key_events';\nimport {DomSharedStylesHost, SharedStylesHost} from './dom/shared_styles_host';\nimport {DomSanitizer, DomSanitizerImpl} from './security/dom_sanitization_service';\n\nexport function initDomAdapter() {\n  BrowserDomAdapter.makeCurrent();\n  BrowserGetTestability.init();\n}\n\nexport function errorHandler(): ErrorHandler {\n  return new ErrorHandler();\n}\n\nexport function _document(): any {\n  // Tell ivy about the global document\n  ɵsetDocument(document);\n  return document;\n}\n\nexport const INTERNAL_BROWSER_PLATFORM_PROVIDERS: StaticProvider[] = [\n  {provide: PLATFORM_ID, useValue: PLATFORM_BROWSER_ID},\n  {provide: PLATFORM_INITIALIZER, useValue: initDomAdapter, multi: true},\n  {provide: DOCUMENT, useFactory: _document, deps: []},\n];\n\n/**\n * A factory function that returns a `PlatformRef` instance associated with browser service\n * providers.\n *\n * @publicApi\n */\nexport const platformBrowser: (extraProviders?: StaticProvider[]) => PlatformRef =\n    createPlatformFactory(platformCore, 'browser', INTERNAL_BROWSER_PLATFORM_PROVIDERS);\n\nexport const BROWSER_MODULE_PROVIDERS: StaticProvider[] = [\n  {provide: INJECTOR_SCOPE, useValue: 'root'},\n  {provide: ErrorHandler, useFactory: errorHandler, deps: []},\n  {\n    provide: EVENT_MANAGER_PLUGINS,\n    useClass: DomEventsPlugin,\n    multi: true,\n    deps: [DOCUMENT, NgZone, PLATFORM_ID]\n  },\n  {provide: EVENT_MANAGER_PLUGINS, useClass: KeyEventsPlugin, multi: true, deps: [DOCUMENT]},\n  {\n    provide: DomRendererFactory2,\n    useClass: DomRendererFactory2,\n    deps: [EventManager, DomSharedStylesHost, APP_ID]\n  },\n  {provide: RendererFactory2, useExisting: DomRendererFactory2},\n  {provide: SharedStylesHost, useExisting: DomSharedStylesHost},\n  {provide: DomSharedStylesHost, useClass: DomSharedStylesHost, deps: [DOCUMENT]},\n  {provide: Testability, useClass: Testability, deps: [NgZone]},\n  {provide: EventManager, useClass: EventManager, deps: [EVENT_MANAGER_PLUGINS, NgZone]},\n  {provide: XhrFactory, useClass: BrowserXhr, deps: []},\n];\n\n/**\n * Exports required infrastructure for all Angular apps.\n * Included by default in all Angular apps created with the CLI\n * `new` command.\n * Re-exports `CommonModule` and `ApplicationModule`, making their\n * exports and providers available to all apps.\n *\n * @publicApi\n */\n@NgModule({providers: BROWSER_MODULE_PROVIDERS, exports: [CommonModule, ApplicationModule]})\nexport class BrowserModule {\n  constructor(@Optional() @SkipSelf() @Inject(BrowserModule) parentModule: BrowserModule|null) {\n    if (parentModule) {\n      throw new Error(\n          `BrowserModule has already been loaded. If you need access to common directives such as NgIf and NgFor from a lazy loaded module, import CommonModule instead.`);\n    }\n  }\n\n  /**\n   * Configures a browser-based app to transition from a server-rendered app, if\n   * one is present on the page.\n   *\n   * @param params An object containing an identifier for the app to transition.\n   * The ID must match between the client and server versions of the app.\n   * @returns The reconfigured `BrowserModule` to import into the app's root `AppModule`.\n   */\n  static withServerTransition(params: {appId: string}): ModuleWithProviders<BrowserModule> {\n    return {\n      ngModule: BrowserModule,\n      providers: [\n        {provide: APP_ID, useValue: params.appId},\n        {provide: TRANSITION_ID, useExisting: APP_ID},\n        SERVER_TRANSITION_PROVIDERS,\n      ],\n    };\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {DOCUMENT, ɵDomAdapter as DomAdapter, ɵgetDOM as getDOM} from '@angular/common';\nimport {Inject, Injectable, ɵɵinject} from '@angular/core';\n\n/**\n * Represents the attributes of an HTML `<meta>` element. The element itself is\n * represented by the internal `HTMLMetaElement`.\n *\n * @see [HTML meta tag](https://developer.mozilla.org/docs/Web/HTML/Element/meta)\n * @see `Meta`\n *\n * @publicApi\n */\nexport type MetaDefinition = {\n  charset?: string;\n  content?: string;\n  httpEquiv?: string;\n  id?: string;\n  itemprop?: string;\n  name?: string;\n  property?: string;\n  scheme?: string;\n  url?: string;\n}&{\n  // TODO(IgorMinar): this type looks wrong\n  [prop: string]: string;\n};\n\n/**\n * Factory to create a `Meta` service instance for the current DOM document.\n */\nexport function createMeta() {\n  return new Meta(ɵɵinject(DOCUMENT));\n}\n\n/**\n * A service for managing HTML `<meta>` tags.\n *\n * Properties of the `MetaDefinition` object match the attributes of the\n * HTML `<meta>` tag. These tags define document metadata that is important for\n * things like configuring a Content Security Policy, defining browser compatibility\n * and security settings, setting HTTP Headers, defining rich content for social sharing,\n * and Search Engine Optimization (SEO).\n *\n * To identify specific `<meta>` tags in a document, use an attribute selection\n * string in the format `\"tag_attribute='value string'\"`.\n * For example, an `attrSelector` value of `\"name='description'\"` matches a tag\n * whose `name` attribute has the value `\"description\"`.\n * Selectors are used with the `querySelector()` Document method,\n * in the format `meta[{attrSelector}]`.\n *\n * @see [HTML meta tag](https://developer.mozilla.org/docs/Web/HTML/Element/meta)\n * @see [Document.querySelector()](https://developer.mozilla.org/docs/Web/API/Document/querySelector)\n *\n *\n * @publicApi\n */\n@Injectable({providedIn: 'root', useFactory: createMeta, deps: []})\nexport class Meta {\n  private _dom: DomAdapter;\n  constructor(@Inject(DOCUMENT) private _doc: any) {\n    this._dom = getDOM();\n  }\n  /**\n   * Retrieves or creates a specific `<meta>` tag element in the current HTML document.\n   * In searching for an existing tag, Angular attempts to match the `name` or `property` attribute\n   * values in the provided tag definition, and verifies that all other attribute values are equal.\n   * If an existing element is found, it is returned and is not modified in any way.\n   * @param tag The definition of a `<meta>` element to match or create.\n   * @param forceCreation True to create a new element without checking whether one already exists.\n   * @returns The existing element with the same attributes and values if found,\n   * the new element if no match is found, or `null` if the tag parameter is not defined.\n   */\n  addTag(tag: MetaDefinition, forceCreation: boolean = false): HTMLMetaElement|null {\n    if (!tag) return null;\n    return this._getOrCreateElement(tag, forceCreation);\n  }\n\n  /**\n   * Retrieves or creates a set of `<meta>` tag elements in the current HTML document.\n   * In searching for an existing tag, Angular attempts to match the `name` or `property` attribute\n   * values in the provided tag definition, and verifies that all other attribute values are equal.\n   * @param tags An array of tag definitions to match or create.\n   * @param forceCreation True to create new elements without checking whether they already exist.\n   * @returns The matching elements if found, or the new elements.\n   */\n  addTags(tags: MetaDefinition[], forceCreation: boolean = false): HTMLMetaElement[] {\n    if (!tags) return [];\n    return tags.reduce((result: HTMLMetaElement[], tag: MetaDefinition) => {\n      if (tag) {\n        result.push(this._getOrCreateElement(tag, forceCreation));\n      }\n      return result;\n    }, []);\n  }\n\n  /**\n   * Retrieves a `<meta>` tag element in the current HTML document.\n   * @param attrSelector The tag attribute and value to match against, in the format\n   * `\"tag_attribute='value string'\"`.\n   * @returns The matching element, if any.\n   */\n  getTag(attrSelector: string): HTMLMetaElement|null {\n    if (!attrSelector) return null;\n    return this._doc.querySelector(`meta[${attrSelector}]`) || null;\n  }\n\n  /**\n   * Retrieves a set of `<meta>` tag elements in the current HTML document.\n   * @param attrSelector The tag attribute and value to match against, in the format\n   * `\"tag_attribute='value string'\"`.\n   * @returns The matching elements, if any.\n   */\n  getTags(attrSelector: string): HTMLMetaElement[] {\n    if (!attrSelector) return [];\n    const list /*NodeList*/ = this._doc.querySelectorAll(`meta[${attrSelector}]`);\n    return list ? [].slice.call(list) : [];\n  }\n\n  /**\n   * Modifies an existing `<meta>` tag element in the current HTML document.\n   * @param tag The tag description with which to replace the existing tag content.\n   * @param selector A tag attribute and value to match against, to identify\n   * an existing tag. A string in the format `\"tag_attribute=`value string`\"`.\n   * If not supplied, matches a tag with the same `name` or `property` attribute value as the\n   * replacement tag.\n   * @return The modified element.\n   */\n  updateTag(tag: MetaDefinition, selector?: string): HTMLMetaElement|null {\n    if (!tag) return null;\n    selector = selector || this._parseSelector(tag);\n    const meta: HTMLMetaElement = this.getTag(selector)!;\n    if (meta) {\n      return this._setMetaElementAttributes(tag, meta);\n    }\n    return this._getOrCreateElement(tag, true);\n  }\n\n  /**\n   * Removes an existing `<meta>` tag element from the current HTML document.\n   * @param attrSelector A tag attribute and value to match against, to identify\n   * an existing tag. A string in the format `\"tag_attribute=`value string`\"`.\n   */\n  removeTag(attrSelector: string): void {\n    this.removeTagElement(this.getTag(attrSelector)!);\n  }\n\n  /**\n   * Removes an existing `<meta>` tag element from the current HTML document.\n   * @param meta The tag definition to match against to identify an existing tag.\n   */\n  removeTagElement(meta: HTMLMetaElement): void {\n    if (meta) {\n      this._dom.remove(meta);\n    }\n  }\n\n  private _getOrCreateElement(meta: MetaDefinition, forceCreation: boolean = false):\n      HTMLMetaElement {\n    if (!forceCreation) {\n      const selector: string = this._parseSelector(meta);\n      // It's allowed to have multiple elements with the same name so it's not enough to\n      // just check that element with the same name already present on the page. We also need to\n      // check if element has tag attributes\n      const elem = this.getTags(selector).filter(elem => this._containsAttributes(meta, elem))[0];\n      if (elem !== undefined) return elem;\n    }\n    const element: HTMLMetaElement = this._dom.createElement('meta') as HTMLMetaElement;\n    this._setMetaElementAttributes(meta, element);\n    const head = this._doc.getElementsByTagName('head')[0];\n    head.appendChild(element);\n    return element;\n  }\n\n  private _setMetaElementAttributes(tag: MetaDefinition, el: HTMLMetaElement): HTMLMetaElement {\n    Object.keys(tag).forEach(\n        (prop: string) => el.setAttribute(this._getMetaKeyMap(prop), tag[prop]));\n    return el;\n  }\n\n  private _parseSelector(tag: MetaDefinition): string {\n    const attr: string = tag.name ? 'name' : 'property';\n    return `${attr}=\"${tag[attr]}\"`;\n  }\n\n  private _containsAttributes(tag: MetaDefinition, elem: HTMLMetaElement): boolean {\n    return Object.keys(tag).every(\n        (key: string) => elem.getAttribute(this._getMetaKeyMap(key)) === tag[key]);\n  }\n\n  private _getMetaKeyMap(prop: string): string {\n    return META_KEYS_MAP[prop] || prop;\n  }\n}\n\n/**\n * Mapping for MetaDefinition properties with their correct meta attribute names\n */\nconst META_KEYS_MAP: {[prop: string]: string;} = {\n  httpEquiv: 'http-equiv'\n};\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\