Add m-esr52 at 52.6.0

1 files changed, 1641 insertions, 0 deletions

diff --git a/dom/base/nsDocument.h b/dom/base/nsDocument.h
new file mode 100644
index 000000000..17d936055
--- /dev/null
+++ b/dom/base/nsDocument.h
@@ -0,0 +1,1641 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Base class for all our document implementations.
+ */
+
+#ifndef nsDocument_h___
+#define nsDocument_h___
+
+#include "nsIDocument.h"
+
+#include "nsCOMPtr.h"
+#include "nsAutoPtr.h"
+#include "nsCRT.h"
+#include "nsWeakReference.h"
+#include "nsWeakPtr.h"
+#include "nsTArray.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMDocumentXBL.h"
+#include "nsStubDocumentObserver.h"
+#include "nsIScriptGlobalObject.h"
+#include "nsIContent.h"
+#include "nsIPrincipal.h"
+#include "nsIParser.h"
+#include "nsBindingManager.h"
+#include "nsInterfaceHashtable.h"
+#include "nsJSThingHashtable.h"
+#include "nsIScriptObjectPrincipal.h"
+#include "nsIURI.h"
+#include "nsScriptLoader.h"
+#include "nsIRadioGroupContainer.h"
+#include "nsILayoutHistoryState.h"
+#include "nsIRequest.h"
+#include "nsILoadGroup.h"
+#include "nsTObserverArray.h"
+#include "nsStubMutationObserver.h"
+#include "nsIChannel.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsContentList.h"
+#include "nsGkAtoms.h"
+#include "nsIApplicationCache.h"
+#include "nsIApplicationCacheContainer.h"
+#include "mozilla/StyleSetHandle.h"
+#include "PLDHashTable.h"
+#include "nsAttrAndChildArray.h"
+#include "nsDOMAttributeMap.h"
+#include "nsIContentViewer.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsILoadContext.h"
+#include "nsIProgressEventSink.h"
+#include "nsISecurityEventSink.h"
+#include "nsIChannelEventSink.h"
+#include "imgIRequest.h"
+#include "mozilla/EventListenerManager.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/PendingAnimationTracker.h"
+#include "mozilla/dom/DOMImplementation.h"
+#include "mozilla/dom/StyleSheetList.h"
+#include "nsDataHashtable.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Attributes.h"
+#include "nsIDOMXPathEvaluator.h"
+#include "jsfriendapi.h"
+#include "ImportManager.h"
+#include "mozilla/LinkedList.h"
+#include "CustomElementRegistry.h"
+#include "mozilla/dom/Performance.h"
+
+#define XML_DECLARATION_BITS_DECLARATION_EXISTS   (1 << 0)
+#define XML_DECLARATION_BITS_ENCODING_EXISTS      (1 << 1)
+#define XML_DECLARATION_BITS_STANDALONE_EXISTS    (1 << 2)
+#define XML_DECLARATION_BITS_STANDALONE_YES       (1 << 3)
+
+
+class nsDOMStyleSheetSetList;
+class nsDocument;
+class nsIRadioVisitor;
+class nsIFormControl;
+struct nsRadioGroupStruct;
+class nsOnloadBlocker;
+class nsUnblockOnloadEvent;
+class nsDOMNavigationTiming;
+class nsWindowSizes;
+class nsHtml5TreeOpExecutor;
+class nsDocumentOnStack;
+class nsISecurityConsoleMessage;
+class nsPIBoxObject;
+
+namespace mozilla {
+class EventChainPreVisitor;
+namespace dom {
+class BoxObject;
+class ImageTracker;
+struct LifecycleCallbacks;
+class CallbackFunction;
+class DOMIntersectionObserver;
+class Performance;
+
+struct FullscreenRequest : public LinkedListElement<FullscreenRequest>
+{
+  explicit FullscreenRequest(Element* aElement);
+  FullscreenRequest(const FullscreenRequest&) = delete;
+  ~FullscreenRequest();
+
+  Element* GetElement() const { return mElement; }
+  nsDocument* GetDocument() const { return mDocument; }
+
+private:
+  RefPtr<Element> mElement;
+  RefPtr<nsDocument> mDocument;
+
+public:
+  // This value should be true if the fullscreen request is
+  // originated from chrome code.
+  bool mIsCallerChrome = false;
+  // This value denotes whether we should trigger a NewOrigin event if
+  // requesting fullscreen in its document causes the origin which is
+  // fullscreen to change. We may want *not* to trigger that event if
+  // we're calling RequestFullScreen() as part of a continuation of a
+  // request in a subdocument in different process, whereupon the caller
+  // need to send some notification itself with the real origin.
+  bool mShouldNotifyNewOrigin = true;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+/**
+ * Right now our identifier map entries contain information for 'name'
+ * and 'id' mappings of a given string. This is so that
+ * nsHTMLDocument::ResolveName only has to do one hash lookup instead
+ * of two. It's not clear whether this still matters for performance.
+ *
+ * We also store the document.all result list here. This is mainly so that
+ * when all elements with the given ID are removed and we remove
+ * the ID's nsIdentifierMapEntry, the document.all result is released too.
+ * Perhaps the document.all results should have their own hashtable
+ * in nsHTMLDocument.
+ */
+class nsIdentifierMapEntry : public nsStringHashKey
+{
+public:
+  typedef mozilla::dom::Element Element;
+  typedef mozilla::net::ReferrerPolicy ReferrerPolicy;
+
+  explicit nsIdentifierMapEntry(const nsAString& aKey) :
+    nsStringHashKey(&aKey), mNameContentList(nullptr)
+  {
+  }
+  explicit nsIdentifierMapEntry(const nsAString* aKey) :
+    nsStringHashKey(aKey), mNameContentList(nullptr)
+  {
+  }
+  nsIdentifierMapEntry(const nsIdentifierMapEntry& aOther) :
+    nsStringHashKey(&aOther.GetKey())
+  {
+    NS_ERROR("Should never be called");
+  }
+  ~nsIdentifierMapEntry();
+
+  void AddNameElement(nsINode* aDocument, Element* aElement);
+  void RemoveNameElement(Element* aElement);
+  bool IsEmpty();
+  nsBaseContentList* GetNameContentList() {
+    return mNameContentList;
+  }
+  bool HasNameElement() const {
+    return mNameContentList && mNameContentList->Length() != 0;
+  }
+
+  /**
+   * Returns the element if we know the element associated with this
+   * id. Otherwise returns null.
+   */
+  Element* GetIdElement();
+  /**
+   * Returns the list of all elements associated with this id.
+   */
+  const nsTArray<Element*>& GetIdElements() const {
+    return mIdContentList;
+  }
+  /**
+   * If this entry has a non-null image element set (using SetImageElement),
+   * the image element will be returned, otherwise the same as GetIdElement().
+   */
+  Element* GetImageIdElement();
+  /**
+   * Append all the elements with this id to aElements
+   */
+  void AppendAllIdContent(nsCOMArray<nsIContent>* aElements);
+  /**
+   * This can fire ID change callbacks.
+   * @return true if the content could be added, false if we failed due
+   * to OOM.
+   */
+  bool AddIdElement(Element* aElement);
+  /**
+   * This can fire ID change callbacks.
+   */
+  void RemoveIdElement(Element* aElement);
+  /**
+   * Set the image element override for this ID. This will be returned by
+   * GetIdElement(true) if non-null.
+   */
+  void SetImageElement(Element* aElement);
+  bool HasIdElementExposedAsHTMLDocumentProperty();
+
+  bool HasContentChangeCallback() { return mChangeCallbacks != nullptr; }
+  void AddContentChangeCallback(nsIDocument::IDTargetObserver aCallback,
+                                void* aData, bool aForImage);
+  void RemoveContentChangeCallback(nsIDocument::IDTargetObserver aCallback,
+                                void* aData, bool aForImage);
+
+  void Traverse(nsCycleCollectionTraversalCallback* aCallback);
+
+  struct ChangeCallback {
+    nsIDocument::IDTargetObserver mCallback;
+    void* mData;
+    bool mForImage;
+  };
+
+  struct ChangeCallbackEntry : public PLDHashEntryHdr {
+    typedef const ChangeCallback KeyType;
+    typedef const ChangeCallback* KeyTypePointer;
+
+    explicit ChangeCallbackEntry(const ChangeCallback* aKey) :
+      mKey(*aKey) { }
+    ChangeCallbackEntry(const ChangeCallbackEntry& toCopy) :
+      mKey(toCopy.mKey) { }
+
+    KeyType GetKey() const { return mKey; }
+    bool KeyEquals(KeyTypePointer aKey) const {
+      return aKey->mCallback == mKey.mCallback &&
+             aKey->mData == mKey.mData &&
+             aKey->mForImage == mKey.mForImage;
+    }
+
+    static KeyTypePointer KeyToPointer(KeyType& aKey) { return &aKey; }
+    static PLDHashNumber HashKey(KeyTypePointer aKey)
+    {
+      return mozilla::HashGeneric(aKey->mCallback, aKey->mData);
+    }
+    enum { ALLOW_MEMMOVE = true };
+
+    ChangeCallback mKey;
+  };
+
+  size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+private:
+  void FireChangeCallbacks(Element* aOldElement, Element* aNewElement,
+                           bool aImageOnly = false);
+
+  // empty if there are no elements with this ID.
+  // The elements are stored as weak pointers.
+  nsTArray<Element*> mIdContentList;
+  RefPtr<nsBaseContentList> mNameContentList;
+  nsAutoPtr<nsTHashtable<ChangeCallbackEntry> > mChangeCallbacks;
+  RefPtr<Element> mImageElement;
+};
+
+namespace mozilla {
+namespace dom {
+
+} // namespace dom
+} // namespace mozilla
+
+class nsDocHeaderData
+{
+public:
+  nsDocHeaderData(nsIAtom* aField, const nsAString& aData)
+    : mField(aField), mData(aData), mNext(nullptr)
+  {
+  }
+
+  ~nsDocHeaderData(void)
+  {
+    delete mNext;
+  }
+
+  nsCOMPtr<nsIAtom> mField;
+  nsString          mData;
+  nsDocHeaderData*  mNext;
+};
+
+class nsDOMStyleSheetList : public mozilla::dom::StyleSheetList,
+                            public nsStubDocumentObserver
+{
+public:
+  explicit nsDOMStyleSheetList(nsIDocument* aDocument);
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // nsIDocumentObserver
+  NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETADDED
+  NS_DECL_NSIDOCUMENTOBSERVER_STYLESHEETREMOVED
+
+  // nsIMutationObserver
+  NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
+
+  virtual nsINode* GetParentObject() const override
+  {
+    return mDocument;
+  }
+
+  uint32_t Length() override;
+  mozilla::StyleSheet* IndexedGetter(uint32_t aIndex, bool& aFound) override;
+
+protected:
+  virtual ~nsDOMStyleSheetList();
+
+  int32_t       mLength;
+  nsIDocument*  mDocument;
+};
+
+class nsOnloadBlocker final : public nsIRequest
+{
+public:
+  nsOnloadBlocker() {}
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIREQUEST
+
+private:
+  ~nsOnloadBlocker() {}
+};
+
+class nsExternalResourceMap
+{
+public:
+  typedef nsIDocument::ExternalResourceLoad ExternalResourceLoad;
+  nsExternalResourceMap();
+
+  /**
+   * Request an external resource document.  This does exactly what
+   * nsIDocument::RequestExternalResource is documented to do.
+   */
+  nsIDocument* RequestResource(nsIURI* aURI,
+                               nsINode* aRequestingNode,
+                               nsDocument* aDisplayDocument,
+                               ExternalResourceLoad** aPendingLoad);
+
+  /**
+   * Enumerate the resource documents.  See
+   * nsIDocument::EnumerateExternalResources.
+   */
+  void EnumerateResources(nsIDocument::nsSubDocEnumFunc aCallback, void* aData);
+
+  /**
+   * Traverse ourselves for cycle-collection
+   */
+  void Traverse(nsCycleCollectionTraversalCallback* aCallback) const;
+
+  /**
+   * Shut ourselves down (used for cycle-collection unlink), as well
+   * as for document destruction.
+   */
+  void Shutdown()
+  {
+    mPendingLoads.Clear();
+    mMap.Clear();
+    mHaveShutDown = true;
+  }
+
+  bool HaveShutDown() const
+  {
+    return mHaveShutDown;
+  }
+
+  // Needs to be public so we can traverse them sanely
+  struct ExternalResource
+  {
+    ~ExternalResource();
+    nsCOMPtr<nsIDocument> mDocument;
+    nsCOMPtr<nsIContentViewer> mViewer;
+    nsCOMPtr<nsILoadGroup> mLoadGroup;
+  };
+
+  // Hide all our viewers
+  void HideViewers();
+
+  // Show all our viewers
+  void ShowViewers();
+
+protected:
+  class PendingLoad : public ExternalResourceLoad,
+                      public nsIStreamListener
+  {
+    ~PendingLoad() {}
+
+  public:
+    explicit PendingLoad(nsDocument* aDisplayDocument) :
+      mDisplayDocument(aDisplayDocument)
+    {}
+
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSISTREAMLISTENER
+    NS_DECL_NSIREQUESTOBSERVER
+
+    /**
+     * Start aURI loading.  This will perform the necessary security checks and
+     * so forth.
+     */
+    nsresult StartLoad(nsIURI* aURI, nsINode* aRequestingNode);
+
+    /**
+     * Set up an nsIContentViewer based on aRequest.  This is guaranteed to
+     * put null in *aViewer and *aLoadGroup on all failures.
+     */
+    nsresult SetupViewer(nsIRequest* aRequest, nsIContentViewer** aViewer,
+                         nsILoadGroup** aLoadGroup);
+
+  private:
+    RefPtr<nsDocument> mDisplayDocument;
+    nsCOMPtr<nsIStreamListener> mTargetListener;
+    nsCOMPtr<nsIURI> mURI;
+  };
+  friend class PendingLoad;
+
+  class LoadgroupCallbacks final : public nsIInterfaceRequestor
+  {
+    ~LoadgroupCallbacks() {}
+  public:
+    explicit LoadgroupCallbacks(nsIInterfaceRequestor* aOtherCallbacks)
+      : mCallbacks(aOtherCallbacks)
+    {}
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIINTERFACEREQUESTOR
+  private:
+    // The only reason it's safe to hold a strong ref here without leaking is
+    // that the notificationCallbacks on a loadgroup aren't the docshell itself
+    // but a shim that holds a weak reference to the docshell.
+    nsCOMPtr<nsIInterfaceRequestor> mCallbacks;
+
+    // Use shims for interfaces that docshell implements directly so that we
+    // don't hand out references to the docshell.  The shims should all allow
+    // getInterface back on us, but other than that each one should only
+    // implement one interface.
+
+    // XXXbz I wish we could just derive the _allcaps thing from _i
+#define DECL_SHIM(_i, _allcaps)                                              \
+    class _i##Shim final : public nsIInterfaceRequestor,                     \
+                           public _i                                         \
+    {                                                                        \
+      ~_i##Shim() {}                                                         \
+    public:                                                                  \
+      _i##Shim(nsIInterfaceRequestor* aIfreq, _i* aRealPtr)                  \
+        : mIfReq(aIfreq), mRealPtr(aRealPtr)                                 \
+      {                                                                      \
+        NS_ASSERTION(mIfReq, "Expected non-null here");                      \
+        NS_ASSERTION(mRealPtr, "Expected non-null here");                    \
+      }                                                                      \
+      NS_DECL_ISUPPORTS                                                      \
+      NS_FORWARD_NSIINTERFACEREQUESTOR(mIfReq->)                             \
+      NS_FORWARD_##_allcaps(mRealPtr->)                                      \
+    private:                                                                 \
+      nsCOMPtr<nsIInterfaceRequestor> mIfReq;                                \
+      nsCOMPtr<_i> mRealPtr;                                                 \
+    };
+
+    DECL_SHIM(nsILoadContext, NSILOADCONTEXT)
+    DECL_SHIM(nsIProgressEventSink, NSIPROGRESSEVENTSINK)
+    DECL_SHIM(nsIChannelEventSink, NSICHANNELEVENTSINK)
+    DECL_SHIM(nsISecurityEventSink, NSISECURITYEVENTSINK)
+    DECL_SHIM(nsIApplicationCacheContainer, NSIAPPLICATIONCACHECONTAINER)
+#undef DECL_SHIM
+  };
+
+  /**
+   * Add an ExternalResource for aURI.  aViewer and aLoadGroup might be null
+   * when this is called if the URI didn't result in an XML document.  This
+   * function makes sure to remove the pending load for aURI, if any, from our
+   * hashtable, and to notify its observers, if any.
+   */
+  nsresult AddExternalResource(nsIURI* aURI, nsIContentViewer* aViewer,
+                               nsILoadGroup* aLoadGroup,
+                               nsIDocument* aDisplayDocument);
+
+  nsClassHashtable<nsURIHashKey, ExternalResource> mMap;
+  nsRefPtrHashtable<nsURIHashKey, PendingLoad> mPendingLoads;
+  bool mHaveShutDown;
+};
+
+// Base class for our document implementations.
+class nsDocument : public nsIDocument,
+                   public nsIDOMDocument,
+                   public nsIDOMDocumentXBL,
+                   public nsSupportsWeakReference,
+                   public nsIScriptObjectPrincipal,
+                   public nsIRadioGroupContainer,
+                   public nsIApplicationCacheContainer,
+                   public nsStubMutationObserver,
+                   public nsIObserver,
+                   public nsIDOMXPathEvaluator
+{
+  friend class nsIDocument;
+
+public:
+  typedef mozilla::dom::Element Element;
+  using nsIDocument::GetElementsByTagName;
+  typedef mozilla::net::ReferrerPolicy ReferrerPolicy;
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+
+  NS_DECL_SIZEOF_EXCLUDING_THIS
+
+  virtual void Reset(nsIChannel *aChannel, nsILoadGroup *aLoadGroup) override;
+  virtual void ResetToURI(nsIURI *aURI, nsILoadGroup *aLoadGroup,
+                          nsIPrincipal* aPrincipal) override;
+
+  // StartDocumentLoad is pure virtual so that subclasses must override it.
+  // The nsDocument StartDocumentLoad does some setup, but does NOT set
+  // *aDocListener; this is the job of subclasses.
+  virtual nsresult StartDocumentLoad(const char* aCommand,
+                                     nsIChannel* aChannel,
+                                     nsILoadGroup* aLoadGroup,
+                                     nsISupports* aContainer,
+                                     nsIStreamListener **aDocListener,
+                                     bool aReset = true,
+                                     nsIContentSink* aContentSink = nullptr) override = 0;
+
+  virtual void StopDocumentLoad() override;
+
+  virtual void NotifyPossibleTitleChange(bool aBoundTitleElement) override;
+
+  virtual void SetDocumentURI(nsIURI* aURI) override;
+
+  virtual void SetChromeXHRDocURI(nsIURI* aURI) override;
+
+  virtual void SetChromeXHRDocBaseURI(nsIURI* aURI) override;
+
+  virtual void ApplySettingsFromCSP(bool aSpeculative) override;
+
+  /**
+   * Set the principal responsible for this document.
+   */
+  virtual void SetPrincipal(nsIPrincipal *aPrincipal) override;
+
+  /**
+   * Get the Content-Type of this document.
+   */
+  // NS_IMETHOD GetContentType(nsAString& aContentType);
+  // Already declared in nsIDOMDocument
+
+  /**
+   * Set the Content-Type of this document.
+   */
+  virtual void SetContentType(const nsAString& aContentType) override;
+
+  virtual void SetBaseURI(nsIURI* aURI) override;
+
+  /**
+   * Get/Set the base target of a link in a document.
+   */
+  virtual void GetBaseTarget(nsAString &aBaseTarget) override;
+
+  /**
+   * Return a standard name for the document's character set. This will
+   * trigger a startDocumentLoad if necessary to answer the question.
+   */
+  virtual void SetDocumentCharacterSet(const nsACString& aCharSetID) override;
+
+  /**
+   * Add an observer that gets notified whenever the charset changes.
+   */
+  virtual nsresult AddCharSetObserver(nsIObserver* aObserver) override;
+
+  /**
+   * Remove a charset observer.
+   */
+  virtual void RemoveCharSetObserver(nsIObserver* aObserver) override;
+
+  virtual Element* AddIDTargetObserver(nsIAtom* aID, IDTargetObserver aObserver,
+                                       void* aData, bool aForImage) override;
+  virtual void RemoveIDTargetObserver(nsIAtom* aID, IDTargetObserver aObserver,
+                                      void* aData, bool aForImage) override;
+
+  /**
+   * Access HTTP header data (this may also get set from other sources, like
+   * HTML META tags).
+   */
+  virtual void GetHeaderData(nsIAtom* aHeaderField, nsAString& aData) const override;
+  virtual void SetHeaderData(nsIAtom* aheaderField,
+                             const nsAString& aData) override;
+
+  /**
+   * Create a new presentation shell that will use aContext for
+   * its presentation context (presentation contexts <b>must not</b> be
+   * shared among multiple presentation shells).
+   */
+  virtual already_AddRefed<nsIPresShell> CreateShell(
+      nsPresContext* aContext,
+      nsViewManager* aViewManager,
+      mozilla::StyleSetHandle aStyleSet) override;
+  virtual void DeleteShell() override;
+
+  virtual nsresult GetAllowPlugins(bool* aAllowPlugins) override;
+
+  static bool IsElementAnimateEnabled(JSContext* aCx, JSObject* aObject);
+  static bool IsWebAnimationsEnabled(JSContext* aCx, JSObject* aObject);
+  virtual mozilla::dom::DocumentTimeline* Timeline() override;
+  virtual void GetAnimations(
+      nsTArray<RefPtr<mozilla::dom::Animation>>& aAnimations) override;
+  mozilla::LinkedList<mozilla::dom::DocumentTimeline>& Timelines() override
+  {
+    return mTimelines;
+  }
+
+  virtual nsresult SetSubDocumentFor(Element* aContent,
+                                     nsIDocument* aSubDoc) override;
+  virtual nsIDocument* GetSubDocumentFor(nsIContent* aContent) const override;
+  virtual Element* FindContentForSubDocument(nsIDocument *aDocument) const override;
+  virtual Element* GetRootElementInternal() const override;
+
+  virtual void EnsureOnDemandBuiltInUASheet(mozilla::StyleSheet* aSheet) override;
+
+  /**
+   * Get the (document) style sheets owned by this document.
+   * These are ordered, highest priority last
+   */
+  virtual int32_t GetNumberOfStyleSheets() const override;
+  virtual mozilla::StyleSheet* GetStyleSheetAt(int32_t aIndex) const override;
+  virtual int32_t GetIndexOfStyleSheet(
+      const mozilla::StyleSheet* aSheet) const override;
+  virtual void AddStyleSheet(mozilla::StyleSheet* aSheet) override;
+  virtual void RemoveStyleSheet(mozilla::StyleSheet* aSheet) override;
+
+  virtual void UpdateStyleSheets(
+      nsTArray<RefPtr<mozilla::StyleSheet>>& aOldSheets,
+      nsTArray<RefPtr<mozilla::StyleSheet>>& aNewSheets) override;
+  virtual void AddStyleSheetToStyleSets(mozilla::StyleSheet* aSheet);
+  virtual void RemoveStyleSheetFromStyleSets(mozilla::StyleSheet* aSheet);
+
+  virtual void InsertStyleSheetAt(mozilla::StyleSheet* aSheet,
+                                  int32_t aIndex) override;
+  virtual void SetStyleSheetApplicableState(mozilla::StyleSheet* aSheet,
+                                            bool aApplicable) override;
+
+  virtual nsresult LoadAdditionalStyleSheet(additionalSheetType aType,
+                                            nsIURI* aSheetURI) override;
+  virtual nsresult AddAdditionalStyleSheet(additionalSheetType aType,
+                                           mozilla::StyleSheet* aSheet) override;
+  virtual void RemoveAdditionalStyleSheet(additionalSheetType aType,
+                                          nsIURI* sheetURI) override;
+  virtual mozilla::StyleSheet* GetFirstAdditionalAuthorSheet() override;
+
+  virtual nsIChannel* GetChannel() const override {
+    return mChannel;
+  }
+
+  virtual nsIChannel* GetFailedChannel() const override {
+    return mFailedChannel;
+  }
+  virtual void SetFailedChannel(nsIChannel* aChannel) override {
+    mFailedChannel = aChannel;
+  }
+
+  virtual void SetScriptGlobalObject(nsIScriptGlobalObject* aGlobalObject) override;
+
+  virtual void SetScriptHandlingObject(nsIScriptGlobalObject* aScriptObject) override;
+
+  virtual nsIGlobalObject* GetScopeObject() const override;
+  void SetScopeObject(nsIGlobalObject* aGlobal) override;
+  /**
+   * Get the script loader for this document
+   */
+  virtual nsScriptLoader* ScriptLoader() override;
+
+  /**
+   * Add/Remove an element to the document's id and name hashes
+   */
+  virtual void AddToIdTable(Element* aElement, nsIAtom* aId) override;
+  virtual void RemoveFromIdTable(Element* aElement, nsIAtom* aId) override;
+  virtual void AddToNameTable(Element* aElement, nsIAtom* aName) override;
+  virtual void RemoveFromNameTable(Element* aElement, nsIAtom* aName) override;
+
+  /**
+   * Add a new observer of document change notifications. Whenever
+   * content is changed, appended, inserted or removed the observers are
+   * informed.
+   */
+  virtual void AddObserver(nsIDocumentObserver* aObserver) override;
+
+  /**
+   * Remove an observer of document change notifications. This will
+   * return false if the observer cannot be found.
+   */
+  virtual bool RemoveObserver(nsIDocumentObserver* aObserver) override;
+
+  // Observation hooks used to propagate notifications to document
+  // observers.
+  virtual void BeginUpdate(nsUpdateType aUpdateType) override;
+  virtual void EndUpdate(nsUpdateType aUpdateType) override;
+  virtual void BeginLoad() override;
+  virtual void EndLoad() override;
+
+  virtual void SetReadyStateInternal(ReadyState rs) override;
+
+  virtual void ContentStateChanged(nsIContent* aContent,
+                                   mozilla::EventStates aStateMask)
+                                     override;
+  virtual void DocumentStatesChanged(
+                 mozilla::EventStates aStateMask) override;
+
+  virtual void StyleRuleChanged(mozilla::StyleSheet* aStyleSheet,
+                                mozilla::css::Rule* aStyleRule) override;
+  virtual void StyleRuleAdded(mozilla::StyleSheet* aStyleSheet,
+                              mozilla::css::Rule* aStyleRule) override;
+  virtual void StyleRuleRemoved(mozilla::StyleSheet* aStyleSheet,
+                                mozilla::css::Rule* aStyleRule) override;
+
+  virtual void FlushPendingNotifications(mozFlushType aType) override;
+  virtual void FlushExternalResources(mozFlushType aType) override;
+  virtual void SetXMLDeclaration(const char16_t *aVersion,
+                                 const char16_t *aEncoding,
+                                 const int32_t aStandalone) override;
+  virtual void GetXMLDeclaration(nsAString& aVersion,
+                                 nsAString& aEncoding,
+                                 nsAString& Standalone) override;
+  virtual bool IsScriptEnabled() override;
+
+  virtual void OnPageShow(bool aPersisted, mozilla::dom::EventTarget* aDispatchStartTarget) override;
+  virtual void OnPageHide(bool aPersisted, mozilla::dom::EventTarget* aDispatchStartTarget) override;
+
+  virtual void WillDispatchMutationEvent(nsINode* aTarget) override;
+  virtual void MutationEventDispatched(nsINode* aTarget) override;
+
+  // nsINode
+  virtual bool IsNodeOfType(uint32_t aFlags) const override;
+  virtual nsIContent *GetChildAt(uint32_t aIndex) const override;
+  virtual nsIContent * const * GetChildArray(uint32_t* aChildCount) const override;
+  virtual int32_t IndexOf(const nsINode* aPossibleChild) const override;
+  virtual uint32_t GetChildCount() const override;
+  virtual nsresult InsertChildAt(nsIContent* aKid, uint32_t aIndex,
+                                 bool aNotify) override;
+  virtual void RemoveChildAt(uint32_t aIndex, bool aNotify) override;
+  virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const override
+  {
+    return NS_ERROR_NOT_IMPLEMENTED;
+  }
+
+  // nsIRadioGroupContainer
+  NS_IMETHOD WalkRadioGroup(const nsAString& aName,
+                            nsIRadioVisitor* aVisitor,
+                            bool aFlushContent) override;
+  virtual void
+    SetCurrentRadioButton(const nsAString& aName,
+                          mozilla::dom::HTMLInputElement* aRadio) override;
+  virtual mozilla::dom::HTMLInputElement*
+    GetCurrentRadioButton(const nsAString& aName) override;
+  NS_IMETHOD
+    GetNextRadioButton(const nsAString& aName,
+                       const bool aPrevious,
+                       mozilla::dom::HTMLInputElement*  aFocusedRadio,
+                       mozilla::dom::HTMLInputElement** aRadioOut) override;
+  virtual void AddToRadioGroup(const nsAString& aName,
+                               nsIFormControl* aRadio) override;
+  virtual void RemoveFromRadioGroup(const nsAString& aName,
+                                    nsIFormControl* aRadio) override;
+  virtual uint32_t GetRequiredRadioCount(const nsAString& aName) const override;
+  virtual void RadioRequiredWillChange(const nsAString& aName,
+                                       bool aRequiredAdded) override;
+  virtual bool GetValueMissingState(const nsAString& aName) const override;
+  virtual void SetValueMissingState(const nsAString& aName, bool aValue) override;
+
+  // for radio group
+  nsRadioGroupStruct* GetRadioGroup(const nsAString& aName) const;
+  nsRadioGroupStruct* GetOrCreateRadioGroup(const nsAString& aName);
+
+  virtual nsViewportInfo GetViewportInfo(const mozilla::ScreenIntSize& aDisplaySize) override;
+
+  void ReportUseCounters();
+
+  virtual void AddIntersectionObserver(
+    mozilla::dom::DOMIntersectionObserver* aObserver) override;
+  virtual void RemoveIntersectionObserver(
+    mozilla::dom::DOMIntersectionObserver* aObserver) override;
+  virtual void UpdateIntersectionObservations() override;
+  virtual void ScheduleIntersectionObserverNotification() override;
+  virtual void NotifyIntersectionObservers() override;
+
+  virtual void NotifyLayerManagerRecreated() override;
+
+
+private:
+  void AddOnDemandBuiltInUASheet(mozilla::StyleSheet* aSheet);
+  nsRadioGroupStruct* GetRadioGroupInternal(const nsAString& aName) const;
+  void SendToConsole(nsCOMArray<nsISecurityConsoleMessage>& aMessages);
+
+public:
+  // nsIDOMNode
+  NS_FORWARD_NSIDOMNODE_TO_NSINODE_OVERRIDABLE
+
+  // nsIDOMDocument
+  NS_DECL_NSIDOMDOCUMENT
+
+  // nsIDOMDocumentXBL
+  NS_DECL_NSIDOMDOCUMENTXBL
+
+  // nsIDOMEventTarget
+  virtual nsresult PreHandleEvent(
+                     mozilla::EventChainPreVisitor& aVisitor) override;
+  virtual mozilla::EventListenerManager*
+    GetOrCreateListenerManager() override;
+  virtual mozilla::EventListenerManager*
+    GetExistingListenerManager() const override;
+
+  // nsIScriptObjectPrincipal
+  virtual nsIPrincipal* GetPrincipal() override;
+
+  // nsIApplicationCacheContainer
+  NS_DECL_NSIAPPLICATIONCACHECONTAINER
+
+  // nsIObserver
+  NS_DECL_NSIOBSERVER
+
+  NS_DECL_NSIDOMXPATHEVALUATOR
+
+  virtual nsresult Init();
+
+  virtual already_AddRefed<Element> CreateElem(const nsAString& aName,
+                                               nsIAtom* aPrefix,
+                                               int32_t aNamespaceID,
+                                               const nsAString* aIs = nullptr) override;
+
+  virtual void Sanitize() override;
+
+  virtual void EnumerateSubDocuments(nsSubDocEnumFunc aCallback,
+                                                 void *aData) override;
+
+  virtual bool CanSavePresentation(nsIRequest *aNewRequest) override;
+  virtual void Destroy() override;
+  virtual void RemovedFromDocShell() override;
+  virtual already_AddRefed<nsILayoutHistoryState> GetLayoutHistoryState() const override;
+
+  virtual void BlockOnload() override;
+  virtual void UnblockOnload(bool aFireSync) override;
+
+  virtual void AddStyleRelevantLink(mozilla::dom::Link* aLink) override;
+  virtual void ForgetLink(mozilla::dom::Link* aLink) override;
+
+  virtual void ClearBoxObjectFor(nsIContent* aContent) override;
+
+  virtual already_AddRefed<mozilla::dom::BoxObject>
+  GetBoxObjectFor(mozilla::dom::Element* aElement,
+                  mozilla::ErrorResult& aRv) override;
+
+  virtual Element*
+    GetAnonymousElementByAttribute(nsIContent* aElement,
+                                   nsIAtom* aAttrName,
+                                   const nsAString& aAttrValue) const override;
+
+  virtual Element* ElementFromPointHelper(float aX, float aY,
+                                          bool aIgnoreRootScrollFrame,
+                                          bool aFlushLayout) override;
+
+  virtual void ElementsFromPointHelper(float aX, float aY,
+                                       uint32_t aFlags,
+                                       nsTArray<RefPtr<mozilla::dom::Element>>& aElements) override;
+
+  virtual nsresult NodesFromRectHelper(float aX, float aY,
+                                                   float aTopSize, float aRightSize,
+                                                   float aBottomSize, float aLeftSize,
+                                                   bool aIgnoreRootScrollFrame,
+                                                   bool aFlushLayout,
+                                                   nsIDOMNodeList** aReturn) override;
+
+  virtual void FlushSkinBindings() override;
+
+  virtual nsresult InitializeFrameLoader(nsFrameLoader* aLoader) override;
+  virtual nsresult FinalizeFrameLoader(nsFrameLoader* aLoader, nsIRunnable* aFinalizer) override;
+  virtual void TryCancelFrameLoaderInitialization(nsIDocShell* aShell) override;
+  virtual nsIDocument*
+    RequestExternalResource(nsIURI* aURI,
+                            nsINode* aRequestingNode,
+                            ExternalResourceLoad** aPendingLoad) override;
+  virtual void
+    EnumerateExternalResources(nsSubDocEnumFunc aCallback, void* aData) override;
+
+  // Returns our (lazily-initialized) animation controller.
+  // If HasAnimationController is true, this is guaranteed to return non-null.
+  nsSMILAnimationController* GetAnimationController() override;
+
+  virtual mozilla::PendingAnimationTracker*
+  GetPendingAnimationTracker() final override
+  {
+    return mPendingAnimationTracker;
+  }
+
+  virtual mozilla::PendingAnimationTracker*
+  GetOrCreatePendingAnimationTracker() override;
+
+  virtual void SuppressEventHandling(SuppressionType aWhat,
+                                     uint32_t aIncrease) override;
+
+  virtual void UnsuppressEventHandlingAndFireEvents(SuppressionType aWhat,
+                                                    bool aFireEvents) override;
+
+  void DecreaseEventSuppression() {
+    MOZ_ASSERT(mEventsSuppressed);
+    --mEventsSuppressed;
+    UpdateFrameRequestCallbackSchedulingState();
+  }
+
+  void ResumeAnimations() {
+    MOZ_ASSERT(mAnimationsPaused);
+    --mAnimationsPaused;
+    UpdateFrameRequestCallbackSchedulingState();
+  }
+
+  virtual nsIDocument* GetTemplateContentsOwner() override;
+
+  NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsDocument,
+                                                                   nsIDocument)
+
+  void DoNotifyPossibleTitleChange();
+
+  nsExternalResourceMap& ExternalResourceMap()
+  {
+    return mExternalResourceMap;
+  }
+
+  void SetLoadedAsData(bool aLoadedAsData) { mLoadedAsData = aLoadedAsData; }
+  void SetLoadedAsInteractiveData(bool aLoadedAsInteractiveData)
+  {
+    mLoadedAsInteractiveData = aLoadedAsInteractiveData;
+  }
+
+  nsresult CloneDocHelper(nsDocument* clone) const;
+
+  void MaybeInitializeFinalizeFrameLoaders();
+
+  void MaybeEndOutermostXBLUpdate();
+
+  virtual void PreloadPictureOpened() override;
+  virtual void PreloadPictureClosed() override;
+
+  virtual void
+    PreloadPictureImageSource(const nsAString& aSrcsetAttr,
+                              const nsAString& aSizesAttr,
+                              const nsAString& aTypeAttr,
+                              const nsAString& aMediaAttr) override;
+
+  virtual already_AddRefed<nsIURI>
+    ResolvePreloadImage(nsIURI *aBaseURI,
+                        const nsAString& aSrcAttr,
+                        const nsAString& aSrcsetAttr,
+                        const nsAString& aSizesAttr) override;
+
+  virtual void MaybePreLoadImage(nsIURI* uri,
+                                 const nsAString &aCrossOriginAttr,
+                                 ReferrerPolicy aReferrerPolicy) override;
+  virtual void ForgetImagePreload(nsIURI* aURI) override;
+
+  virtual void MaybePreconnect(nsIURI* uri,
+                               mozilla::CORSMode aCORSMode) override;
+
+  virtual void PreloadStyle(nsIURI* uri, const nsAString& charset,
+                            const nsAString& aCrossOriginAttr,
+                            ReferrerPolicy aReferrerPolicy,
+                            const nsAString& aIntegrity) override;
+
+  virtual nsresult LoadChromeSheetSync(nsIURI* uri, bool isAgentSheet,
+                                       RefPtr<mozilla::StyleSheet>* aSheet) override;
+
+  virtual nsISupports* GetCurrentContentSink() override;
+
+  virtual mozilla::EventStates GetDocumentState() override;
+
+  // Only BlockOnload should call this!
+  void AsyncBlockOnload();
+
+  virtual void SetScrollToRef(nsIURI *aDocumentURI) override;
+  virtual void ScrollToRef() override;
+  virtual void ResetScrolledToRefAlready() override;
+  virtual void SetChangeScrollPosWhenScrollingToRef(bool aValue) override;
+
+  virtual Element *GetElementById(const nsAString& aElementId) override;
+  virtual const nsTArray<Element*>* GetAllElementsForId(const nsAString& aElementId) const override;
+
+  virtual Element *LookupImageElement(const nsAString& aElementId) override;
+  virtual void MozSetImageElement(const nsAString& aImageElementId,
+                                  Element* aElement) override;
+
+  // AddPlugin adds a plugin-related element to mPlugins when the element is
+  // added to the tree.
+  virtual nsresult AddPlugin(nsIObjectLoadingContent* aPlugin) override;
+  // RemovePlugin removes a plugin-related element to mPlugins when the
+  // element is removed from the tree.
+  virtual void RemovePlugin(nsIObjectLoadingContent* aPlugin) override;
+  // GetPlugins returns the plugin-related elements from
+  // the frame and any subframes.
+  virtual void GetPlugins(nsTArray<nsIObjectLoadingContent*>& aPlugins) override;
+
+  // Adds an element to mResponsiveContent when the element is
+  // added to the tree.
+  virtual nsresult AddResponsiveContent(nsIContent* aContent) override;
+  // Removes an element from mResponsiveContent when the element is
+  // removed from the tree.
+  virtual void RemoveResponsiveContent(nsIContent* aContent) override;
+  // Notifies any responsive content added by AddResponsiveContent upon media
+  // features values changing.
+  virtual void NotifyMediaFeatureValuesChanged() override;
+
+  virtual nsresult GetStateObject(nsIVariant** aResult) override;
+
+  virtual nsDOMNavigationTiming* GetNavigationTiming() const override;
+  virtual nsresult SetNavigationTiming(nsDOMNavigationTiming* aTiming) override;
+
+  virtual Element* FindImageMap(const nsAString& aNormalizedMapName) override;
+
+  virtual nsTArray<Element*> GetFullscreenStack() const override;
+  virtual void AsyncRequestFullScreen(
+    mozilla::UniquePtr<FullscreenRequest>&& aRequest) override;
+  virtual void RestorePreviousFullScreenState() override;
+  virtual bool IsFullscreenLeaf() override;
+  virtual nsresult
+    RemoteFrameFullscreenChanged(nsIDOMElement* aFrameElement) override;
+
+  virtual nsresult RemoteFrameFullscreenReverted() override;
+  virtual nsIDocument* GetFullscreenRoot() override;
+  virtual void SetFullscreenRoot(nsIDocument* aRoot) override;
+
+  // Returns the size of the mBlockedTrackingNodes array. (nsIDocument.h)
+  //
+  // This array contains nodes that have been blocked to prevent
+  // user tracking. They most likely have had their nsIChannel
+  // canceled by the URL classifier (Safebrowsing).
+  //
+  // A script can subsequently use GetBlockedTrackingNodes()
+  // to get a list of references to these nodes.
+  //
+  // Note:
+  // This expresses how many tracking nodes have been blocked for this
+  // document since its beginning, not how many of them are still around
+  // in the DOM tree. Weak references to blocked nodes are added in the
+  // mBlockedTrackingNodesArray but they are not removed when those nodes
+  // are removed from the tree or even garbage collected.
+  long BlockedTrackingNodeCount() const;
+
+  //
+  // Returns strong references to mBlockedTrackingNodes. (nsIDocument.h)
+  //
+  // This array contains nodes that have been blocked to prevent
+  // user tracking. They most likely have had their nsIChannel
+  // canceled by the URL classifier (Safebrowsing).
+  //
+  already_AddRefed<nsSimpleContentList> BlockedTrackingNodes() const;
+
+  static bool IsUnprefixedFullscreenEnabled(JSContext* aCx, JSObject* aObject);
+
+  // Do the "fullscreen element ready check" from the fullscreen spec.
+  // It returns true if the given element is allowed to go into fullscreen.
+  bool FullscreenElementReadyCheck(Element* aElement, bool aWasCallerChrome);
+
+  // This is called asynchronously by nsIDocument::AsyncRequestFullScreen()
+  // to move this document into full-screen mode if allowed.
+  void RequestFullScreen(mozilla::UniquePtr<FullscreenRequest>&& aRequest);
+
+  // Removes all elements from the full-screen stack, removing full-scren
+  // styles from the top element in the stack.
+  void CleanupFullscreenState();
+
+  // Pushes aElement onto the full-screen stack, and removes full-screen styles
+  // from the former full-screen stack top, and its ancestors, and applies the
+  // styles to aElement. aElement becomes the new "full-screen element".
+  bool FullScreenStackPush(Element* aElement);
+
+  // Remove the top element from the full-screen stack. Removes the full-screen
+  // styles from the former top element, and applies them to the new top
+  // element, if there is one.
+  void FullScreenStackPop();
+
+  // Returns the top element from the full-screen stack.
+  Element* FullScreenStackTop();
+
+  // DOM-exposed fullscreen API
+  bool FullscreenEnabled() override;
+  Element* GetFullscreenElement() override;
+
+  void RequestPointerLock(Element* aElement) override;
+  bool SetPointerLock(Element* aElement, int aCursorStyle);
+  static void UnlockPointer(nsIDocument* aDoc = nullptr);
+
+  void SetCurrentOrientation(mozilla::dom::OrientationType aType,
+                             uint16_t aAngle) override;
+  uint16_t CurrentOrientationAngle() const override;
+  mozilla::dom::OrientationType CurrentOrientationType() const override;
+  void SetOrientationPendingPromise(mozilla::dom::Promise* aPromise) override;
+  mozilla::dom::Promise* GetOrientationPendingPromise() const override;
+
+  // This method may fire a DOM event; if it does so it will happen
+  // synchronously.
+  void UpdateVisibilityState();
+  // Posts an event to call UpdateVisibilityState
+  virtual void PostVisibilityUpdateEvent() override;
+
+  // Since we wouldn't automatically play media from non-visited page, we need
+  // to notify window when the page was first visited.
+  void MaybeActiveMediaComponents();
+
+  virtual void DocAddSizeOfExcludingThis(nsWindowSizes* aWindowSizes) const override;
+  // DocAddSizeOfIncludingThis is inherited from nsIDocument.
+
+  virtual nsIDOMNode* AsDOMNode() override { return this; }
+
+  // WebIDL bits
+  virtual mozilla::dom::DOMImplementation*
+    GetImplementation(mozilla::ErrorResult& rv) override;
+  virtual void
+    RegisterElement(JSContext* aCx, const nsAString& aName,
+                    const mozilla::dom::ElementRegistrationOptions& aOptions,
+                    JS::MutableHandle<JSObject*> aRetval,
+                    mozilla::ErrorResult& rv) override;
+  virtual mozilla::dom::StyleSheetList* StyleSheets() override;
+  virtual void SetSelectedStyleSheetSet(const nsAString& aSheetSet) override;
+  virtual void GetLastStyleSheetSet(nsString& aSheetSet) override;
+  virtual mozilla::dom::DOMStringList* StyleSheetSets() override;
+  virtual void EnableStyleSheetsForSet(const nsAString& aSheetSet) override;
+  virtual already_AddRefed<Element> CreateElement(const nsAString& aTagName,
+                                                  const mozilla::dom::ElementCreationOptionsOrString& aOptions,
+                                                  ErrorResult& rv) override;
+  virtual already_AddRefed<Element> CreateElementNS(const nsAString& aNamespaceURI,
+                                                    const nsAString& aQualifiedName,
+                                                    const mozilla::dom::ElementCreationOptionsOrString& aOptions,
+                                                    mozilla::ErrorResult& rv) override;
+
+  virtual nsIDocument* MasterDocument() override
+  {
+    return mMasterDocument ? mMasterDocument.get()
+                           : this;
+  }
+
+  virtual void SetMasterDocument(nsIDocument* master) override
+  {
+    MOZ_ASSERT(master);
+    mMasterDocument = master;
+  }
+
+  virtual bool IsMasterDocument() override
+  {
+    return !mMasterDocument;
+  }
+
+  virtual mozilla::dom::ImportManager* ImportManager() override
+  {
+    if (mImportManager) {
+      MOZ_ASSERT(!mMasterDocument, "Only the master document has ImportManager set");
+      return mImportManager.get();
+    }
+
+    if (mMasterDocument) {
+      return mMasterDocument->ImportManager();
+    }
+
+    // ImportManager is created lazily.
+    // If the manager is not yet set it has to be the
+    // master document and this is the first import in it.
+    // Let's create a new manager.
+    mImportManager = new mozilla::dom::ImportManager();
+    return mImportManager.get();
+  }
+
+  virtual bool HasSubImportLink(nsINode* aLink) override
+  {
+    return mSubImportLinks.Contains(aLink);
+  }
+
+  virtual uint32_t IndexOfSubImportLink(nsINode* aLink) override
+  {
+    return mSubImportLinks.IndexOf(aLink);
+  }
+
+  virtual void AddSubImportLink(nsINode* aLink) override
+  {
+    mSubImportLinks.AppendElement(aLink);
+  }
+
+  virtual nsINode* GetSubImportLink(uint32_t aIdx) override
+  {
+    return aIdx < mSubImportLinks.Length() ? mSubImportLinks[aIdx].get()
+                                           : nullptr;
+  }
+
+  virtual void UnblockDOMContentLoaded() override;
+
+protected:
+  friend class nsNodeUtils;
+  friend class nsDocumentOnStack;
+
+  void IncreaseStackRefCnt()
+  {
+    ++mStackRefCnt;
+  }
+
+  void DecreaseStackRefCnt()
+  {
+    if (--mStackRefCnt == 0 && mNeedsReleaseAfterStackRefCntRelease) {
+      mNeedsReleaseAfterStackRefCntRelease = false;
+      NS_RELEASE_THIS();
+    }
+  }
+
+  /**
+   * Check that aId is not empty and log a message to the console
+   * service if it is.
+   * @returns true if aId looks correct, false otherwise.
+   */
+  inline bool CheckGetElementByIdArg(const nsAString& aId)
+  {
+    if (aId.IsEmpty()) {
+      ReportEmptyGetElementByIdArg();
+      return false;
+    }
+    return true;
+  }
+
+  void ReportEmptyGetElementByIdArg();
+
+  void DispatchContentLoadedEvents();
+
+  void RetrieveRelevantHeaders(nsIChannel *aChannel);
+
+  void TryChannelCharset(nsIChannel *aChannel,
+                         int32_t& aCharsetSource,
+                         nsACString& aCharset,
+                         nsHtml5TreeOpExecutor* aExecutor);
+
+  // Call this before the document does something that will unbind all content.
+  // That will stop us from doing a lot of work as each element is removed.
+  void DestroyElementMaps();
+
+  // Refreshes the hrefs of all the links in the document.
+  void RefreshLinkHrefs();
+
+  nsIContent* GetFirstBaseNodeWithHref();
+  nsresult SetFirstBaseNodeWithHref(nsIContent *node);
+
+  /**
+   * Returns the title element of the document as defined by the HTML
+   * specification, or null if there isn't one.  For documents whose root
+   * element is an <svg:svg>, this is the first <svg:title> element that's a
+   * child of the root.  For other documents, it's the first HTML title element
+   * in the document.
+   */
+  Element* GetTitleElement();
+
+public:
+  // Get our title
+  virtual void GetTitle(nsString& aTitle) override;
+  // Set our title
+  virtual void SetTitle(const nsAString& aTitle, mozilla::ErrorResult& rv) override;
+
+  bool mIsTopLevelContentDocument: 1;
+  bool mIsContentDocument: 1;
+
+  bool IsTopLevelContentDocument();
+  void SetIsTopLevelContentDocument(bool aIsTopLevelContentDocument);
+
+  bool IsContentDocument() const;
+  void SetIsContentDocument(bool aIsContentDocument);
+
+  js::ExpandoAndGeneration mExpandoAndGeneration;
+
+  bool ContainsEMEContent();
+
+  bool ContainsMSEContent();
+
+protected:
+  already_AddRefed<nsIPresShell> doCreateShell(nsPresContext* aContext,
+                                               nsViewManager* aViewManager,
+                                               mozilla::StyleSetHandle aStyleSet);
+
+  void RemoveDocStyleSheetsFromStyleSets();
+  void RemoveStyleSheetsFromStyleSets(
+      const nsTArray<RefPtr<mozilla::StyleSheet>>& aSheets,
+      mozilla::SheetType aType);
+  void ResetStylesheetsToURI(nsIURI* aURI);
+  void FillStyleSet(mozilla::StyleSetHandle aStyleSet);
+
+  // Return whether all the presshells for this document are safe to flush
+  bool IsSafeToFlush() const;
+
+  void DispatchPageTransition(mozilla::dom::EventTarget* aDispatchTarget,
+                              const nsAString& aType,
+                              bool aPersisted);
+
+  virtual nsPIDOMWindowOuter* GetWindowInternal() const override;
+  virtual nsIScriptGlobalObject* GetScriptHandlingObjectInternal() const override;
+  virtual bool InternalAllowXULXBL() override;
+
+  void UpdateScreenOrientation();
+
+#define NS_DOCUMENT_NOTIFY_OBSERVERS(func_, params_)                        \
+  NS_OBSERVER_ARRAY_NOTIFY_XPCOM_OBSERVERS(mObservers, nsIDocumentObserver, \
+                                           func_, params_);
+
+#ifdef DEBUG
+  void VerifyRootContentState();
+#endif
+
+  explicit nsDocument(const char* aContentType);
+  virtual ~nsDocument();
+
+  void EnsureOnloadBlocker();
+
+  void NotifyStyleSheetApplicableStateChanged();
+
+  // Apply the fullscreen state to the document, and trigger related
+  // events. It returns false if the fullscreen element ready check
+  // fails and nothing gets changed.
+  bool ApplyFullscreen(const FullscreenRequest& aRequest);
+
+  nsTArray<nsIObserver*> mCharSetObservers;
+
+  PLDHashTable *mSubDocuments;
+
+  // Array of owning references to all children
+  nsAttrAndChildArray mChildren;
+
+  // Pointer to our parser if we're currently in the process of being
+  // parsed into.
+  nsCOMPtr<nsIParser> mParser;
+
+  // Weak reference to our sink for in case we no longer have a parser.  This
+  // will allow us to flush out any pending stuff from the sink even if
+  // EndLoad() has already happened.
+  nsWeakPtr mWeakSink;
+
+  nsTArray<RefPtr<mozilla::StyleSheet>> mStyleSheets;
+  nsTArray<RefPtr<mozilla::StyleSheet>> mOnDemandBuiltInUASheets;
+  nsTArray<RefPtr<mozilla::StyleSheet>> mAdditionalSheets[AdditionalSheetTypeCount];
+
+  // Array of observers
+  nsTObserverArray<nsIDocumentObserver*> mObservers;
+
+  // Array of intersection observers
+  nsTArray<RefPtr<mozilla::dom::DOMIntersectionObserver>> mIntersectionObservers;
+
+  // Tracker for animations that are waiting to start.
+  // nullptr until GetOrCreatePendingAnimationTracker is called.
+  RefPtr<mozilla::PendingAnimationTracker> mPendingAnimationTracker;
+
+  // Weak reference to the scope object (aka the script global object)
+  // that, unlike mScriptGlobalObject, is never unset once set. This
+  // is a weak reference to avoid leaks due to circular references.
+  nsWeakPtr mScopeObject;
+
+  // Stack of full-screen elements. When we request full-screen we push the
+  // full-screen element onto this stack, and when we cancel full-screen we
+  // pop one off this stack, restoring the previous full-screen state
+  nsTArray<nsWeakPtr> mFullScreenStack;
+
+  // The root of the doc tree in which this document is in. This is only
+  // non-null when this document is in fullscreen mode.
+  nsWeakPtr mFullscreenRoot;
+
+private:
+  static bool CustomElementConstructor(JSContext* aCx, unsigned aArgc, JS::Value* aVp);
+
+  /**
+   * Check if the passed custom element name, aOptions.mIs, is a registered
+   * custom element type or not, then return the custom element name for future
+   * usage.
+   *
+   * If there is no existing custom element definition for this name, throw a
+   * NotFoundError.
+   */
+  const nsString* CheckCustomElementName(
+    const mozilla::dom::ElementCreationOptions& aOptions,
+    const nsAString& aLocalName,
+    uint32_t aNamespaceID,
+    ErrorResult& rv);
+
+public:
+  virtual already_AddRefed<mozilla::dom::CustomElementRegistry>
+    GetCustomElementRegistry() override;
+
+  // Check whether web components are enabled for the global of aObject.
+  static bool IsWebComponentsEnabled(JSContext* aCx, JSObject* aObject);
+  // Check whether web components are enabled for the global of the document
+  // this nodeinfo comes from.
+  static bool IsWebComponentsEnabled(mozilla::dom::NodeInfo* aNodeInfo);
+  // Check whether web components are enabled for the given window.
+  static bool IsWebComponentsEnabled(nsPIDOMWindowInner* aWindow);
+
+  RefPtr<mozilla::EventListenerManager> mListenerManager;
+  RefPtr<mozilla::dom::StyleSheetList> mDOMStyleSheets;
+  RefPtr<nsDOMStyleSheetSetList> mStyleSheetSetList;
+  RefPtr<nsScriptLoader> mScriptLoader;
+  nsDocHeaderData* mHeaderData;
+  /* mIdentifierMap works as follows for IDs:
+   * 1) Attribute changes affect the table immediately (removing and adding
+   *    entries as needed).
+   * 2) Removals from the DOM affect the table immediately
+   * 3) Additions to the DOM always update existing entries for names, and add
+   *    new ones for IDs.
+   */
+  nsTHashtable<nsIdentifierMapEntry> mIdentifierMap;
+
+  nsClassHashtable<nsStringHashKey, nsRadioGroupStruct> mRadioGroups;
+
+  // Recorded time of change to 'loading' state.
+  mozilla::TimeStamp mLoadingTimeStamp;
+
+  // True if the document has been detached from its content viewer.
+  bool mIsGoingAway:1;
+  // True if the document is being destroyed.
+  bool mInDestructor:1;
+
+  // True if this document has ever had an HTML or SVG <title> element
+  // bound to it
+  bool mMayHaveTitleElement:1;
+
+  bool mHasWarnedAboutBoxObjects:1;
+
+  bool mDelayFrameLoaderInitialization:1;
+
+  bool mSynchronousDOMContentLoaded:1;
+
+  bool mInXBLUpdate:1;
+
+  // Whether we're currently under a FlushPendingNotifications call to
+  // our presshell.  This is used to handle flush reentry correctly.
+  bool mInFlush:1;
+
+  // Parser aborted. True if the parser of this document was forcibly
+  // terminated instead of letting it finish at its own pace.
+  bool mParserAborted:1;
+
+  friend class nsCallRequestFullScreen;
+
+  // ScreenOrientation "pending promise" as described by
+  // http://www.w3.org/TR/screen-orientation/
+  RefPtr<mozilla::dom::Promise> mOrientationPendingPromise;
+
+  uint16_t mCurrentOrientationAngle;
+  mozilla::dom::OrientationType mCurrentOrientationType;
+
+  // Keeps track of whether we have a pending
+  // 'style-sheet-applicable-state-changed' notification.
+  bool mSSApplicableStateNotificationPending:1;
+
+  // Whether we have reported use counters for this document with Telemetry yet.
+  // Normally this is only done at document destruction time, but for image
+  // documents (SVG documents) that are not guaranteed to be destroyed, we
+  // report use counters when the image cache no longer has any imgRequestProxys
+  // pointing to them.  We track whether we ever reported use counters so
+  // that we only report them once for the document.
+  bool mReportedUseCounters:1;
+
+  // Whether we have filled our pres shell's style set with the document's
+  // additional sheets and sheets from the nsStyleSheetService.
+  bool mStyleSetFilled:1;
+
+  uint8_t mPendingFullscreenRequests;
+
+  uint8_t mXMLDeclarationBits;
+
+  nsInterfaceHashtable<nsPtrHashKey<nsIContent>, nsPIBoxObject> *mBoxObjectTable;
+
+  // A document "without a browsing context" that owns the content of
+  // HTMLTemplateElement.
+  nsCOMPtr<nsIDocument> mTemplateContentsOwner;
+
+  // Our update nesting level
+  uint32_t mUpdateNestLevel;
+
+  // The application cache that this document is associated with, if
+  // any.  This can change during the lifetime of the document.
+  nsCOMPtr<nsIApplicationCache> mApplicationCache;
+
+  nsCOMPtr<nsIContent> mFirstBaseNodeWithHref;
+
+  mozilla::EventStates mDocumentState;
+  mozilla::EventStates mGotDocumentState;
+
+  RefPtr<nsDOMNavigationTiming> mTiming;
+private:
+  friend class nsUnblockOnloadEvent;
+  // Recomputes the visibility state but doesn't set the new value.
+  mozilla::dom::VisibilityState GetVisibilityState() const;
+  void NotifyStyleSheetAdded(mozilla::StyleSheet* aSheet, bool aDocumentSheet);
+  void NotifyStyleSheetRemoved(mozilla::StyleSheet* aSheet, bool aDocumentSheet);
+
+  void PostUnblockOnloadEvent();
+  void DoUnblockOnload();
+
+  nsresult CheckFrameOptions();
+  nsresult InitCSP(nsIChannel* aChannel);
+
+  /**
+   * Find the (non-anonymous) content in this document for aFrame. It will
+   * be aFrame's content node if that content is in this document and not
+   * anonymous. Otherwise, when aFrame is in a subdocument, we use the frame
+   * element containing the subdocument containing aFrame, and/or find the
+   * nearest non-anonymous ancestor in this document.
+   * Returns null if there is no such element.
+   */
+  nsIContent* GetContentInThisDocument(nsIFrame* aFrame) const;
+
+  // Just like EnableStyleSheetsForSet, but doesn't check whether
+  // aSheetSet is null and allows the caller to control whether to set
+  // aSheetSet as the preferred set in the CSSLoader.
+  void EnableStyleSheetsForSetInternal(const nsAString& aSheetSet,
+                                       bool aUpdateCSSLoader);
+
+  void ClearAllBoxObjects();
+
+  // Returns true if the scheme for the url for this document is "about"
+  bool IsAboutPage();
+
+  // These are not implemented and not supported.
+  nsDocument(const nsDocument& aOther);
+  nsDocument& operator=(const nsDocument& aOther);
+
+  // The layout history state that should be used by nodes in this
+  // document.  We only actually store a pointer to it when:
+  // 1)  We have no script global object.
+  // 2)  We haven't had Destroy() called on us yet.
+  nsCOMPtr<nsILayoutHistoryState> mLayoutHistoryState;
+
+  // Currently active onload blockers
+  uint32_t mOnloadBlockCount;
+  // Onload blockers which haven't been activated yet
+  uint32_t mAsyncOnloadBlockCount;
+  nsCOMPtr<nsIRequest> mOnloadBlocker;
+
+  // A hashtable of styled links keyed by address pointer.
+  nsTHashtable<nsPtrHashKey<mozilla::dom::Link> > mStyledLinks;
+#ifdef DEBUG
+  // Indicates whether mStyledLinks was cleared or not.  This is used to track
+  // state so we can provide useful assertions to consumers of ForgetLink and
+  // AddStyleRelevantLink.
+  bool mStyledLinksCleared;
+#endif
+
+  // A set of responsive images keyed by address pointer.
+  nsTHashtable< nsPtrHashKey<nsIContent> > mResponsiveContent;
+
+  // Member to store out last-selected stylesheet set.
+  nsString mLastStyleSheetSet;
+
+  nsTArray<RefPtr<nsFrameLoader> > mInitializableFrameLoaders;
+  nsTArray<nsCOMPtr<nsIRunnable> > mFrameLoaderFinalizers;
+  RefPtr<nsRunnableMethod<nsDocument> > mFrameLoaderRunner;
+
+  nsCOMPtr<nsIRunnable> mMaybeEndOutermostXBLUpdateRunner;
+
+  nsRevocableEventPtr<nsRunnableMethod<nsDocument, void, false> >
+    mPendingTitleChangeEvent;
+
+  nsExternalResourceMap mExternalResourceMap;
+
+  // All images in process of being preloaded.  This is a hashtable so
+  // we can remove them as the real image loads start; that way we
+  // make sure to not keep the image load going when no one cares
+  // about it anymore.
+  nsRefPtrHashtable<nsURIHashKey, imgIRequest> mPreloadingImages;
+
+  // A list of preconnects initiated by the preloader. This prevents
+  // the same uri from being used more than once, and allows the dom
+  // builder to not repeat the work of the preloader.
+  nsDataHashtable< nsURIHashKey, bool> mPreloadedPreconnects;
+
+  // Current depth of picture elements from parser
+  int32_t mPreloadPictureDepth;
+
+  // Set if we've found a URL for the current picture
+  nsString mPreloadPictureFoundSource;
+
+  RefPtr<mozilla::dom::DOMImplementation> mDOMImplementation;
+
+  RefPtr<nsContentList> mImageMaps;
+
+  nsCString mScrollToRef;
+  uint8_t mScrolledToRefAlready : 1;
+  uint8_t mChangeScrollPosWhenScrollingToRef : 1;
+
+  // Tracking for plugins in the document.
+  nsTHashtable< nsPtrHashKey<nsIObjectLoadingContent> > mPlugins;
+
+  RefPtr<mozilla::dom::DocumentTimeline> mDocumentTimeline;
+  mozilla::LinkedList<mozilla::dom::DocumentTimeline> mTimelines;
+
+  enum ViewportType {
+    DisplayWidthHeight,
+    Specified,
+    Unknown
+  };
+
+  ViewportType mViewportType;
+
+  // These member variables cache information about the viewport so we don't have to
+  // recalculate it each time.
+  bool mValidWidth, mValidHeight;
+  mozilla::LayoutDeviceToScreenScale mScaleMinFloat;
+  mozilla::LayoutDeviceToScreenScale mScaleMaxFloat;
+  mozilla::LayoutDeviceToScreenScale mScaleFloat;
+  mozilla::CSSToLayoutDeviceScale mPixelRatio;
+  bool mAutoSize, mAllowZoom, mAllowDoubleTapZoom, mValidScaleFloat, mValidMaxScale, mScaleStrEmpty, mWidthStrEmpty;
+  mozilla::CSSSize mViewportSize;
+
+  nsrefcnt mStackRefCnt;
+  bool mNeedsReleaseAfterStackRefCntRelease;
+
+  nsCOMPtr<nsIDocument> mMasterDocument;
+  RefPtr<mozilla::dom::ImportManager> mImportManager;
+  nsTArray<nsCOMPtr<nsINode> > mSubImportLinks;
+
+  // Set to true when the document is possibly controlled by the ServiceWorker.
+  // Used to prevent multiple requests to ServiceWorkerManager.
+  bool mMaybeServiceWorkerControlled;
+
+#ifdef DEBUG
+public:
+  bool mWillReparent;
+#endif
+};
+
+class nsDocumentOnStack
+{
+public:
+  explicit nsDocumentOnStack(nsDocument* aDoc) : mDoc(aDoc)
+  {
+    mDoc->IncreaseStackRefCnt();
+  }
+  ~nsDocumentOnStack()
+  {
+    mDoc->DecreaseStackRefCnt();
+  }
+private:
+  nsDocument* mDoc;
+};
+
+#endif /* nsDocument_h___ */