DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (56e7b9127e89)

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/* -*- 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/. */
#ifndef nsIDocument_h___
#define nsIDocument_h___

#include "mozilla/FlushType.h"           // for enum
#include "nsAutoPtr.h"                   // for member
#include "nsCOMArray.h"                  // for member
#include "nsCompatibility.h"             // for member
#include "nsCOMPtr.h"                    // for member
#include "nsGkAtoms.h"                   // for static class members
#include "nsIApplicationCache.h"
#include "nsIApplicationCacheContainer.h"
#include "nsIContentViewer.h"
#include "nsIDOMXULCommandDispatcher.h"
#include "nsIInterfaceRequestor.h"
#include "nsILoadContext.h"
#include "nsILoadGroup.h"                // for member (in nsCOMPtr)
#include "nsINode.h"                     // for base class
#include "nsIParser.h"
#include "nsIPresShell.h"
#include "nsIChannelEventSink.h"
#include "nsIProgressEventSink.h"
#include "nsISecurityEventSink.h"
#include "nsIScriptGlobalObject.h"       // for member (in nsCOMPtr)
#include "nsIServiceManager.h"
#include "nsIURI.h"                      // for use in inline functions
#include "nsIUUIDGenerator.h"
#include "nsPIDOMWindow.h"               // for use in inline functions
#include "nsPropertyTable.h"             // for member
#include "nsStringFwd.h"
#include "nsTHashtable.h"                // for member
#include "nsURIHashKey.h"
#include "mozilla/net/ReferrerPolicy.h"  // for member
#include "nsWeakReference.h"
#include "mozilla/UseCounter.h"
#include "mozilla/WeakPtr.h"
#include "Units.h"
#include "nsContentListDeclarations.h"
#include "nsExpirationTracker.h"
#include "nsClassHashtable.h"
#include "mozilla/CORSMode.h"
#include "mozilla/dom/DispatcherTrait.h"
#include "mozilla/dom/DocumentOrShadowRoot.h"
#include "mozilla/LinkedList.h"
#include "mozilla/NotNull.h"
#include "mozilla/SegmentedVector.h"
#include "mozilla/ServoBindingTypes.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/UniquePtr.h"
#include <bitset>                        // for member

// windows.h #defines CreateEvent
#ifdef CreateEvent
#undef CreateEvent
#endif

#ifdef MOZILLA_INTERNAL_API
#include "mozilla/dom/DocumentBinding.h"
#else
namespace mozilla {
namespace dom {
class ElementCreationOptionsOrString;
} // namespace dom
} // namespace mozilla
#endif // MOZILLA_INTERNAL_API

class gfxUserFontSet;
class imgIRequest;
class nsBindingManager;
class nsCachableElementsByNameNodeList;
class nsIDocShell;
class nsDocShell;
class nsDOMNavigationTiming;
class nsDOMStyleSheetSetList;
class nsFrameLoader;
class nsGlobalWindowInner;
class nsHTMLCSSStyleSheet;
class nsHTMLDocument;
class nsHTMLStyleSheet;
class nsGenericHTMLElement;
class nsAtom;
class nsIBFCacheEntry;
class nsIChannel;
class nsIContent;
class nsIContentSink;
class nsIDocShell;
class nsIDocShellTreeItem;
class nsIDocumentEncoder;
class nsIDocumentObserver;
class nsIHTMLCollection;
class nsILayoutHistoryState;
class nsILoadContext;
class nsIObjectLoadingContent;
class nsIObserver;
class nsIPrincipal;
class nsIRequest;
class nsIRunnable;
class nsISecurityConsoleMessage;
class nsIStreamListener;
class nsIStructuredCloneContainer;
class nsIURI;
class nsIVariant;
class nsViewManager;
class nsPresContext;
class nsRange;
class nsSMILAnimationController;
class nsSVGElement;
class nsTextNode;
class nsUnblockOnloadEvent;
class nsWindowSizes;
class nsDOMCaretPosition;
class nsViewportInfo;
class nsIGlobalObject;
class nsIXULWindow;

namespace mozilla {
class AbstractThread;
class CSSStyleSheet;
class Encoding;
class ErrorResult;
class EventStates;
class EventListenerManager;
class PendingAnimationTracker;
class ServoStyleSet;
template<typename> class OwningNonNull;
struct URLExtraData;

namespace css {
class Loader;
class ImageLoader;
class Rule;
} // namespace css

namespace dom {
class Animation;
class AnonymousContent;
class Attr;
class BoxObject;
class ClientInfo;
class ClientState;
class CDATASection;
class Comment;
struct CustomElementDefinition;
class DocGroup;
class DocumentFragment;
class DocumentTimeline;
class DocumentType;
class DOMImplementation;
class DOMIntersectionObserver;
class DOMStringList;
class Element;
struct ElementCreationOptions;
class Event;
class EventTarget;
class FontFaceSet;
class FrameRequestCallback;
struct FullscreenRequest;
class ImageTracker;
class HTMLBodyElement;
class HTMLSharedElement;
class HTMLImageElement;
struct LifecycleCallbackArgs;
class Link;
class Location;
class MediaQueryList;
class GlobalObject;
class NodeFilter;
class NodeIterator;
enum class OrientationType : uint8_t;
class ProcessingInstruction;
class Promise;
class ScriptLoader;
class Selection;
class ServiceWorkerDescriptor;
class StyleSheetList;
class SVGDocument;
class SVGSVGElement;
class SVGUseElement;
class Touch;
class TouchList;
class TreeWalker;
class XPathEvaluator;
class XPathExpression;
class XPathNSResolver;
class XPathResult;
class XULDocument;
template<typename> class Sequence;

template<typename, typename> class CallbackObjectHolder;

enum class CallerType : uint32_t;

} // namespace dom
} // namespace mozilla

// Must be kept in sync with xpcom/rust/xpcom/src/interfaces/nonidl.rs
#define NS_IDOCUMENT_IID \
{ 0xce1f7627, 0x7109, 0x4977, \
  { 0xba, 0x77, 0x49, 0x0f, 0xfd, 0xe0, 0x7a, 0xaa } }

// Enum for requesting a particular type of document when creating a doc
enum DocumentFlavor {
  DocumentFlavorLegacyGuess, // compat with old code until made HTML5-compliant
  DocumentFlavorHTML, // HTMLDocument with HTMLness bit set to true
  DocumentFlavorSVG, // SVGDocument
  DocumentFlavorPlain, // Just a Document
};

// Document states

// RTL locale: specific to the XUL localedir attribute
#define NS_DOCUMENT_STATE_RTL_LOCALE              NS_DEFINE_EVENT_STATE_MACRO(0)
// Window activation status
#define NS_DOCUMENT_STATE_WINDOW_INACTIVE         NS_DEFINE_EVENT_STATE_MACRO(1)

// Some function forward-declarations
class nsContentList;
class nsDocumentOnStack;

class nsDocHeaderData
{
public:
  nsDocHeaderData(nsAtom* aField, const nsAString& aData)
    : mField(aField), mData(aData), mNext(nullptr)
  {
  }

  ~nsDocHeaderData(void)
  {
    delete mNext;
  }

  RefPtr<nsAtom> mField;
  nsString mData;
  nsDocHeaderData* mNext;
};

class nsExternalResourceMap
{
  typedef bool (*nsSubDocEnumFunc)(nsIDocument *aDocument, void *aData);

public:
  /**
   * A class that represents an external resource load that has begun but
   * doesn't have a document yet.  Observers can be registered on this object,
   * and will be notified after the document is created.  Observers registered
   * after the document has been created will NOT be notified.  When observers
   * are notified, the subject will be the newly-created document, the topic
   * will be "external-resource-document-created", and the data will be null.
   * If document creation fails for some reason, observers will still be
   * notified, with a null document pointer.
   */
  class ExternalResourceLoad : public nsISupports
  {
  public:
    virtual ~ExternalResourceLoad() {}

    void AddObserver(nsIObserver* aObserver)
    {
      MOZ_ASSERT(aObserver, "Must have observer");
      mObservers.AppendElement(aObserver);
    }

    const nsTArray<nsCOMPtr<nsIObserver>> & Observers()
    {
      return mObservers;
    }
  protected:
    AutoTArray<nsCOMPtr<nsIObserver>, 8> mObservers;
  };

  nsExternalResourceMap();

  /**
   * Request an external resource document.  This does exactly what
   * nsIDocument::RequestExternalResource is documented to do.
   */
  nsIDocument* RequestResource(nsIURI* aURI,
                               nsINode* aRequestingNode,
                               nsIDocument* aDisplayDocument,
                               ExternalResourceLoad** aPendingLoad);

  /**
   * Enumerate the resource documents.  See
   * nsIDocument::EnumerateExternalResources.
   */
  void EnumerateResources(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(nsIDocument* 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:
    nsCOMPtr<nsIDocument> 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;
};

//----------------------------------------------------------------------

// For classifying a flash document based on its principal.
class PrincipalFlashClassifier;

// Document interface.  This is implemented by all document objects in
// Gecko.
class nsIDocument : public nsINode,
                    public mozilla::dom::DocumentOrShadowRoot,
                    public mozilla::dom::DispatcherTrait
{
  typedef mozilla::dom::GlobalObject GlobalObject;

protected:
  using Encoding = mozilla::Encoding;
  template <typename T> using NotNull = mozilla::NotNull<T>;

public:
  typedef nsExternalResourceMap::ExternalResourceLoad ExternalResourceLoad;
  typedef mozilla::net::ReferrerPolicy ReferrerPolicyEnum;
  typedef mozilla::dom::Element Element;
  typedef mozilla::dom::FullscreenRequest FullscreenRequest;

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IDOCUMENT_IID)

#ifdef MOZILLA_INTERNAL_API
  nsIDocument();
#endif

  // This helper class must be set when we dispatch beforeunload and unload
  // events in order to avoid unterminate sync XHRs.
  class MOZ_RAII PageUnloadingEventTimeStamp
  {
    nsCOMPtr<nsIDocument> mDocument;
    bool mSet;

  public:
    explicit PageUnloadingEventTimeStamp(nsIDocument* aDocument)
      : mDocument(aDocument)
      , mSet(false)
    {
      MOZ_ASSERT(aDocument);
      if (mDocument->mPageUnloadingEventTimeStamp.IsNull()) {
        mDocument->SetPageUnloadingEventTimeStamp();
        mSet = true;
      }
    }

    ~PageUnloadingEventTimeStamp()
    {
      if (mSet) {
        mDocument->CleanUnloadEventsTimeStamp();
      }
    }
  };

  /**
   * Let the document know that we're starting to load data into it.
   * @param aCommand The parser command. Must not be null.
   *                 XXXbz It's odd to have that here.
   * @param aChannel The channel the data will come from. The channel must be
   *                 able to report its Content-Type.
   * @param aLoadGroup The loadgroup this document should use from now on.
   *                   Note that the document might not be the only thing using
   *                   this loadgroup.
   * @param aContainer The container this document is in.  This may be null.
   *                   XXXbz maybe we should make it more explicit (eg make the
   *                   container an nsIWebNavigation or nsIDocShell or
   *                   something)?
   * @param [out] aDocListener the listener to pump data from the channel into.
   *                           Generally this will be the parser this document
   *                           sets up, or some sort of data-handler for media
   *                           documents.
   * @param aReset whether the document should call Reset() on itself.  If this
   *               is false, the document will NOT set its principal to the
   *               channel's owner, will not clear any event listeners that are
   *               already set on it, etc.
   * @param aSink The content sink to use for the data.  If this is null and
   *              the document needs a content sink, it will create one based
   *              on whatever it knows about the data it's going to load.
   *              This MUST be null if the underlying document is an HTML
   *              document. Even in the XML case, please don't add new calls
   *              with non-null sink.
   *
   * Once this has been called, the document will return false for
   * MayStartLayout() until SetMayStartLayout(true) is called on it.  Making
   * sure this happens is the responsibility of the caller of
   * StartDocumentLoad().
   */
  virtual nsresult StartDocumentLoad(const char* aCommand,
                                     nsIChannel* aChannel,
                                     nsILoadGroup* aLoadGroup,
                                     nsISupports* aContainer,
                                     nsIStreamListener **aDocListener,
                                     bool aReset,
                                     nsIContentSink* aSink = nullptr) = 0;
  virtual void StopDocumentLoad() = 0;

  virtual void SetSuppressParserErrorElement(bool aSuppress) {}
  virtual bool SuppressParserErrorElement() { return false; }

  virtual void SetSuppressParserErrorConsoleMessages(bool aSuppress) {}
  virtual bool SuppressParserErrorConsoleMessages() { return false; }

  // nsINode
  bool IsNodeOfType(uint32_t aFlags) const final;
  nsresult InsertChildBefore(nsIContent* aKid, nsIContent* aBeforeThis,
                             bool aNotify) override;
  void RemoveChildNode(nsIContent* aKid, bool aNotify) final;
  nsresult Clone(mozilla::dom::NodeInfo* aNodeInfo,
                 nsINode **aResult) const override
  {
    return NS_ERROR_NOT_IMPLEMENTED;
  }

  /**
   * Signal that the document title may have changed
   * (see nsDocument::GetTitle).
   * @param aBoundTitleElement true if an HTML or SVG <title> element
   * has just been bound to the document.
   */
  void NotifyPossibleTitleChange(bool aBoundTitleElement);

  /**
   * Return the URI for the document. May return null.
   *
   * The value returned corresponds to the "document's address" in
   * HTML5.  As such, it may change over the lifetime of the document, for
   * instance as a result of the user navigating to a fragment identifier on
   * the page, or as a result to a call to pushState() or replaceState().
   *
   * https://html.spec.whatwg.org/multipage/dom.html#the-document%27s-address
   */
  nsIURI* GetDocumentURI() const
  {
    return mDocumentURI;
  }

  /**
   * Return the original URI of the document.  This is the same as the
   * document's URI unless that has changed from its original value (for
   * example, due to history.pushState() or replaceState() being invoked on the
   * document).
   *
   * This method corresponds to the "creation URL" in HTML5 and, once set,
   * doesn't change over the lifetime of the document.
   *
   * https://html.spec.whatwg.org/multipage/webappapis.html#creation-url
   */
  nsIURI* GetOriginalURI() const
  {
    return mOriginalURI;
  }

  /**
   * Set the URI for the document.  This also sets the document's original URI,
   * if it's null.
   */
  void SetDocumentURI(nsIURI* aURI);

  /**
   * Set the URI for the document loaded via XHR, when accessed from
   * chrome privileged script.
   */
  void SetChromeXHRDocURI(nsIURI* aURI)
  {
    mChromeXHRDocURI = aURI;
  }

  /**
   * Set the base URI for the document loaded via XHR, when accessed from
   * chrome privileged script.
   */
  void SetChromeXHRDocBaseURI(nsIURI* aURI)
  {
    mChromeXHRDocBaseURI = aURI;
  }

  /**
   * Set referrer policy and upgrade-insecure-requests flags
   */
  void ApplySettingsFromCSP(bool aSpeculative);

  already_AddRefed<nsIParser> CreatorParserOrNull()
  {
    nsCOMPtr<nsIParser> parser = mParser;
    return parser.forget();
  }

  /**
   * Return the referrer policy of the document. Return "default" if there's no
   * valid meta referrer tag found in the document.
   */
  ReferrerPolicyEnum GetReferrerPolicy() const
  {
    return mReferrerPolicy;
  }

  /**
   * GetReferrerPolicy() for Document.webidl.
   */
  uint32_t ReferrerPolicy() const
  {
    return GetReferrerPolicy();
  }

  /**
   * If true, this flag indicates that all mixed content subresource
   * loads for this document (and also embeded browsing contexts) will
   * be blocked.
   */
  bool GetBlockAllMixedContent(bool aPreload) const
  {
    if (aPreload) {
      return mBlockAllMixedContentPreloads;
    }
    return mBlockAllMixedContent;
  }

  /**
   * If true, this flag indicates that all subresource loads for this
   * document need to be upgraded from http to https.
   * This flag becomes true if the CSP of the document itself, or any
   * of the document's ancestors up to the toplevel document makes use
   * of the CSP directive 'upgrade-insecure-requests'.
   */
  bool GetUpgradeInsecureRequests(bool aPreload) const
  {
    if (aPreload) {
      return mUpgradeInsecurePreloads;
    }
    return mUpgradeInsecureRequests;
  }

  void SetReferrer(const nsACString& aReferrer) {
    mReferrer = aReferrer;
  }

  /**
   * Set the principal responsible for this document.  Chances are,
   * you do not want to be using this.
   */
  void SetPrincipal(nsIPrincipal* aPrincipal);

  /**
   * Get the list of ancestor principals for a document.  This is the same as
   * the ancestor list for the document's docshell the last time SetContainer()
   * was called with a non-null argument. See the documentation for the
   * corresponding getter in docshell for how this list is determined.  We store
   * a copy of the list, because we may lose the ability to reach our docshell
   * before people stop asking us for this information.
   */
  const nsTArray<nsCOMPtr<nsIPrincipal>>& AncestorPrincipals() const
  {
    return mAncestorPrincipals;
  }

  /**
   * Get the list of ancestor outerWindowIDs for a document that correspond to
   * the ancestor principals (see above for more details).
   */
  const nsTArray<uint64_t>& AncestorOuterWindowIDs() const
  {
    return mAncestorOuterWindowIDs;
  }

  /**
   * Return the LoadGroup for the document. May return null.
   */
  already_AddRefed<nsILoadGroup> GetDocumentLoadGroup() const
  {
    nsCOMPtr<nsILoadGroup> group = do_QueryReferent(mDocumentLoadGroup);
    return group.forget();
  }

  /**
   * Return the fallback base URL for this document, as defined in the HTML
   * specification.  Note that this can return null if there is no document URI.
   *
   * XXXbz: This doesn't implement the bits for about:blank yet.
   */
  nsIURI* GetFallbackBaseURI() const
  {
    if (mIsSrcdocDocument && mParentDocument) {
      return mParentDocument->GetDocBaseURI();
    }
    return mDocumentURI;
  }

  /**
   * Return the base URI for relative URIs in the document (the document uri
   * unless it's overridden by SetBaseURI, HTML <base> tags, etc.).  The
   * returned URI could be null if there is no document URI.  If the document is
   * a srcdoc document and has no explicit base URL, return the parent
   * document's base URL.
   */
  nsIURI* GetDocBaseURI() const
  {
    if (mDocumentBaseURI) {
      return mDocumentBaseURI;
    }
    return GetFallbackBaseURI();
  }

  already_AddRefed<nsIURI> GetBaseURI(bool aTryUseXHRDocBaseURI = false) const final;

  void SetBaseURI(nsIURI* aURI);

  /**
   * Return the URL data which style system needs for resolving url value.
   * This method attempts to use the cached object in mCachedURLData, but
   * if the base URI, document URI, or principal has changed since last
   * call to this function, or the function is called the first time for
   * the document, a new one is created.
   */
  mozilla::URLExtraData* DefaultStyleAttrURLData();

  /**
   * Get/Set the base target of a link in a document.
   */
  void GetBaseTarget(nsAString& aBaseTarget) const
  {
    aBaseTarget = mBaseTarget;
  }

  void SetBaseTarget(const nsString& aBaseTarget) {
    mBaseTarget = aBaseTarget;
  }

  /**
   * Return a standard name for the document's character set.
   */
  NotNull<const Encoding*> GetDocumentCharacterSet() const
  {
    return mCharacterSet;
  }

  /**
   * Set the document's character encoding.
   */
  virtual void SetDocumentCharacterSet(NotNull<const Encoding*> aEncoding);

  int32_t GetDocumentCharacterSetSource() const
  {
    return mCharacterSetSource;
  }

  // This method MUST be called before SetDocumentCharacterSet if
  // you're planning to call both.
  void SetDocumentCharacterSetSource(int32_t aCharsetSource)
  {
    mCharacterSetSource = aCharsetSource;
  }

  /**
   * Get the Content-Type of this document.
   */
  void GetContentType(nsAString& aContentType);

  /**
   * Set the Content-Type of this document.
   */
  virtual void SetContentType(const nsAString& aContentType);

  /**
   * Return the language of this document.
   */
  void GetContentLanguage(nsAString& aContentLanguage) const
  {
    CopyASCIItoUTF16(mContentLanguage, aContentLanguage);
  }

  // The states BidiEnabled and MathMLEnabled should persist across multiple views
  // (screen, print) of the same document.

  /**
   * Check if the document contains bidi data.
   * If so, we have to apply the Unicode Bidi Algorithm.
   */
  bool GetBidiEnabled() const
  {
    return mBidiEnabled;
  }

  /**
   * Indicate the document contains bidi data.
   * Currently, we cannot disable bidi, because once bidi is enabled,
   * it affects a frame model irreversibly, and plays even though
   * the document no longer contains bidi data.
   */
  void SetBidiEnabled()
  {
    mBidiEnabled = true;
  }

  void SetMathMLEnabled()
  {
    mMathMLEnabled = true;
  }

  /**
   * Ask this document whether it's the initial document in its window.
   */
  bool IsInitialDocument() const
  {
    return mIsInitialDocumentInWindow;
  }

  /**
   * Tell this document that it's the initial document in its window.  See
   * comments on mIsInitialDocumentInWindow for when this should be called.
   */
  void SetIsInitialDocument(bool aIsInitialDocument)
  {
    mIsInitialDocumentInWindow = aIsInitialDocument;
  }

  /**
   * Normally we assert if a runnable labeled with one DocGroup touches data
   * from another DocGroup. Calling IgnoreDocGroupMismatches() on a document
   * means that we can touch that document from any DocGroup without asserting.
   */
  void IgnoreDocGroupMismatches()
  {
    mIgnoreDocGroupMismatches = true;
  }

  /**
   * Get the bidi options for this document.
   * @see nsBidiUtils.h
   */
  uint32_t GetBidiOptions() const
  {
    return mBidiOptions;
  }

  /**
   * Set the bidi options for this document.  This just sets the bits;
   * callers are expected to take action as needed if they want this
   * change to actually change anything immediately.
   * @see nsBidiUtils.h
   */
  void SetBidiOptions(uint32_t aBidiOptions)
  {
    mBidiOptions = aBidiOptions;
  }

  /**
   * Get the has mixed active content loaded flag for this document.
   */
  bool GetHasMixedActiveContentLoaded()
  {
    return mHasMixedActiveContentLoaded;
  }

  /**
   * Set the has mixed active content loaded flag for this document.
   */
  void SetHasMixedActiveContentLoaded(bool aHasMixedActiveContentLoaded)
  {
    mHasMixedActiveContentLoaded = aHasMixedActiveContentLoaded;
  }

  /**
   * Get mixed active content blocked flag for this document.
   */
  bool GetHasMixedActiveContentBlocked()
  {
    return mHasMixedActiveContentBlocked;
  }

  /**
   * Set the mixed active content blocked flag for this document.
   */
  void SetHasMixedActiveContentBlocked(bool aHasMixedActiveContentBlocked)
  {
    mHasMixedActiveContentBlocked = aHasMixedActiveContentBlocked;
  }

  /**
   * Get the has mixed display content loaded flag for this document.
   */
  bool GetHasMixedDisplayContentLoaded()
  {
    return mHasMixedDisplayContentLoaded;
  }

  /**
   * Set the has mixed display content loaded flag for this document.
   */
  void SetHasMixedDisplayContentLoaded(bool aHasMixedDisplayContentLoaded)
  {
    mHasMixedDisplayContentLoaded = aHasMixedDisplayContentLoaded;
  }

  /**
   * Get mixed display content blocked flag for this document.
   */
  bool GetHasMixedDisplayContentBlocked()
  {
    return mHasMixedDisplayContentBlocked;
  }

  /**
   * Set the mixed display content blocked flag for this document.
   */
  void SetHasMixedDisplayContentBlocked(bool aHasMixedDisplayContentBlocked)
  {
    mHasMixedDisplayContentBlocked = aHasMixedDisplayContentBlocked;
  }

  /**
   * Set the mixed content object subrequest flag for this document.
   */
  void SetHasMixedContentObjectSubrequest(bool aHasMixedContentObjectSubrequest)
  {
    mHasMixedContentObjectSubrequest = aHasMixedContentObjectSubrequest;
  }

  /**
   * Set CSP flag for this document.
   */
  void SetHasCSP(bool aHasCSP)
  {
    mHasCSP = aHasCSP;
  }

  /**
   * Set unsafe-inline CSP flag for this document.
   */
  void SetHasUnsafeInlineCSP(bool aHasUnsafeInlineCSP)
  {
    mHasUnsafeInlineCSP = aHasUnsafeInlineCSP;
  }

  /**
   * Set unsafe-eval CSP flag for this document.
   */
  void SetHasUnsafeEvalCSP(bool aHasUnsafeEvalCSP)
  {
    mHasUnsafeEvalCSP = aHasUnsafeEvalCSP;
  }

  /**
   * Get tracking content blocked flag for this document.
   */
  bool GetHasTrackingContentBlocked()
  {
    return mHasTrackingContentBlocked;
  }

  /**
   * Get tracking cookies blocked flag for this document.
   */
  bool GetHasTrackingCookiesBlocked()
  {
    return mHasTrackingCookiesBlocked;
  }

  /**
   * Set the tracking content blocked flag for this document.
   */
  void SetHasTrackingContentBlocked(bool aHasTrackingContentBlocked)
  {
    mHasTrackingContentBlocked = aHasTrackingContentBlocked;
  }

  /**
   * Set the tracking cookies blocked flag for this document.
   */
  void SetHasTrackingCookiesBlocked(bool aHasTrackingCookiesBlocked)
  {
    mHasTrackingCookiesBlocked = aHasTrackingCookiesBlocked;
  }

  /**
   * Get tracking content loaded flag for this document.
   */
  bool GetHasTrackingContentLoaded()
  {
    return mHasTrackingContentLoaded;
  }

  /**
   * Set the tracking content loaded flag for this document.
   */
  void SetHasTrackingContentLoaded(bool aHasTrackingContentLoaded)
  {
    mHasTrackingContentLoaded = aHasTrackingContentLoaded;
  }

  /**
   * Get the sandbox flags for this document.
   * @see nsSandboxFlags.h for the possible flags
   */
  uint32_t GetSandboxFlags() const
  {
    return mSandboxFlags;
  }

  /**
   * Get string representation of sandbox flags (null if no flags are set)
   */
  void GetSandboxFlagsAsString(nsAString& aFlags);

  /**
   * Set the sandbox flags for this document.
   * @see nsSandboxFlags.h for the possible flags
   */
  void SetSandboxFlags(uint32_t sandboxFlags)
  {
    mSandboxFlags = sandboxFlags;
  }

  /**
   * Called when the document was decoded as UTF-8 and decoder encountered no
   * errors.
   */
  void EnableEncodingMenu()
  {
    mEncodingMenuDisabled = false;
  }

  /**
   * Access HTTP header data (this may also get set from other
   * sources, like HTML META tags).
   */
  void GetHeaderData(nsAtom* aHeaderField, nsAString& aData) const;
  void SetHeaderData(nsAtom* aheaderField, const nsAString& aData);

  /**
   * 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). The caller of this
   * method is responsible for calling BeginObservingDocument() on the
   * presshell if the presshell should observe document mutations.
   */
  already_AddRefed<nsIPresShell> CreateShell(
    nsPresContext* aContext,
    nsViewManager* aViewManager,
    mozilla::UniquePtr<mozilla::ServoStyleSet> aStyleSet);
  void DeleteShell();

  nsIPresShell* GetShell() const
  {
    return GetBFCacheEntry() ? nullptr : mPresShell;
  }

  nsIPresShell* GetObservingShell() const
  {
    return mPresShell && mPresShell->IsObservingDocument()
      ? mPresShell : nullptr;
  }

  // Return whether the presshell for this document is safe to flush.
  bool IsSafeToFlush() const;

  nsPresContext* GetPresContext() const
  {
    nsIPresShell* shell = GetShell();
    return shell ? shell->GetPresContext() : nullptr;
  }

  bool HasShellOrBFCacheEntry() const
  {
    return mPresShell || mBFCacheEntry;
  }

  // Instead using this method, what you probably want is
  // RemoveFromBFCacheSync() as we do in MessagePort and BroadcastChannel.
  void DisallowBFCaching()
  {
    NS_ASSERTION(!mBFCacheEntry, "We're already in the bfcache!");
    mBFCacheDisallowed = true;
  }

  bool IsBFCachingAllowed() const
  {
    return !mBFCacheDisallowed;
  }

  // Accepts null to clear the BFCache entry too.
  void SetBFCacheEntry(nsIBFCacheEntry* aEntry);

  nsIBFCacheEntry* GetBFCacheEntry() const
  {
    return mBFCacheEntry;
  }

  /**
   * Return the parent document of this document. Will return null
   * unless this document is within a compound document and has a
   * parent. Note that this parent chain may cross chrome boundaries.
   */
  nsIDocument *GetParentDocument() const
  {
    return mParentDocument;
  }

  /**
   * Set the parent document of this document.
   */
  void SetParentDocument(nsIDocument* aParent)
  {
    mParentDocument = aParent;
    if (aParent) {
      mIgnoreDocGroupMismatches = aParent->mIgnoreDocGroupMismatches;
    }
  }

  /**
   * Are plugins allowed in this document ?
   */
  bool GetAllowPlugins();

  /**
   * Set the sub document for aContent to aSubDoc.
   */
  nsresult SetSubDocumentFor(Element* aContent, nsIDocument* aSubDoc);

  /**
   * Get the sub document for aContent
   */
  nsIDocument* GetSubDocumentFor(nsIContent* aContent) const;

  /**
   * Find the content node for which aDocument is a sub document.
   */
  Element* FindContentForSubDocument(nsIDocument* aDocument) const;

  /**
   * Return the doctype for this document.
   */
  mozilla::dom::DocumentType* GetDoctype() const;

  /**
   * Return the root element for this document.
   */
  Element* GetRootElement() const;

  mozilla::dom::Selection* GetSelection(mozilla::ErrorResult& aRv);

  /**
   * Gets the event target to dispatch key events to if there is no focused
   * content in the document.
   */
  virtual nsIContent* GetUnfocusedKeyEventTarget();

  /**
   * Retrieve information about the viewport as a data structure.
   * This will return information in the viewport META data section
   * of the document. This can be used in lieu of ProcessViewportInfo(),
   * which places the viewport information in the document header instead
   * of returning it directly.
   *
   * @param aDisplaySize size of the on-screen display area for this
   * document, in device pixels.
   *
   * NOTE: If the site is optimized for mobile (via the doctype), this
   * will return viewport information that specifies default information.
   */
  nsViewportInfo GetViewportInfo(const mozilla::ScreenIntSize& aDisplaySize);

  /**
   * It updates the viewport overflow type with the given two widths
   * and the viewport setting of the document.
   * This should only be called when there is out-of-reach overflow
   * happens on the viewport, i.e. the viewport should be using
   * `overflow: hidden`. And it should only be called on a top level
   * content document.
   */
  void UpdateViewportOverflowType(nscoord aScrolledWidth,
                                  nscoord aScrollportWidth);

  /**
   * True iff this doc will ignore manual character encoding overrides.
   */
  virtual bool WillIgnoreCharsetOverride() {
    return true;
  }

  /**
   * Return whether the document was created by a srcdoc iframe.
   */
  bool IsSrcdocDocument() const {
    return mIsSrcdocDocument;
  }

  /**
   * Sets whether the document was created by a srcdoc iframe.
   */
  void SetIsSrcdocDocument(bool aIsSrcdocDocument) {
    mIsSrcdocDocument = aIsSrcdocDocument;
  }

  /*
   * Gets the srcdoc string from within the channel (assuming both exist).
   * Returns a void string if this isn't a srcdoc document or if
   * the channel has not been set.
   */
  nsresult GetSrcdocData(nsAString& aSrcdocData);

  bool DidDocumentOpen() {
    return mDidDocumentOpen;
  }

  already_AddRefed<mozilla::dom::AnonymousContent>
  InsertAnonymousContent(mozilla::dom::Element& aElement,
                         mozilla::ErrorResult& aError);
  void RemoveAnonymousContent(mozilla::dom::AnonymousContent& aContent,
                              mozilla::ErrorResult& aError);
  /**
   * If aNode is a descendant of anonymous content inserted by
   * InsertAnonymousContent, this method returns the root element of the
   * inserted anonymous content (in other words, the clone of the aElement
   * that was passed to InsertAnonymousContent).
   */
  Element* GetAnonRootIfInAnonymousContentContainer(nsINode* aNode) const;
  nsTArray<RefPtr<mozilla::dom::AnonymousContent>>& GetAnonymousContents() {
    return mAnonymousContents;
  }

  mozilla::TimeStamp GetPageUnloadingEventTimeStamp() const
  {
    if (!mParentDocument) {
      return mPageUnloadingEventTimeStamp;
    }

    mozilla::TimeStamp parentTimeStamp(mParentDocument->GetPageUnloadingEventTimeStamp());
    if (parentTimeStamp.IsNull()) {
      return mPageUnloadingEventTimeStamp;
    }

    if (!mPageUnloadingEventTimeStamp ||
        parentTimeStamp < mPageUnloadingEventTimeStamp) {
      return parentTimeStamp;
    }

    return mPageUnloadingEventTimeStamp;
  }

  void NotifyLayerManagerRecreated();

  /**
   * Add an SVG element to the list of elements that need
   * their mapped attributes resolved to a Servo declaration block.
   *
   * These are weak pointers, please manually unschedule them when an element
   * is removed.
   */
  void ScheduleSVGForPresAttrEvaluation(nsSVGElement* aSVG)
  {
    mLazySVGPresElements.PutEntry(aSVG);
  }

  // Unschedule an element scheduled by ScheduleFrameRequestCallback (e.g. for
  // when it is destroyed)
  void UnscheduleSVGForPresAttrEvaluation(nsSVGElement* aSVG)
  {
    mLazySVGPresElements.RemoveEntry(aSVG);
  }

  // Resolve all SVG pres attrs scheduled in ScheduleSVGForPresAttrEvaluation
  void ResolveScheduledSVGPresAttrs();

  mozilla::Maybe<mozilla::dom::ClientInfo> GetClientInfo() const;
  mozilla::Maybe<mozilla::dom::ClientState> GetClientState() const;
  mozilla::Maybe<mozilla::dom::ServiceWorkerDescriptor> GetController() const;

  // Returns the size of the mBlockedTrackingNodes array.
  //
  // 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
  {
    return mBlockedTrackingNodes.Length();
  }

  //
  // 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;

protected:
  friend class nsUnblockOnloadEvent;

  nsresult InitCSP(nsIChannel* aChannel);

  void PostUnblockOnloadEvent();

  void DoUnblockOnload();

  void ClearAllBoxObjects();

  void MaybeEndOutermostXBLUpdate();

  void DispatchContentLoadedEvents();

  void DispatchPageTransition(mozilla::dom::EventTarget* aDispatchTarget,
                              const nsAString& aType,
                              bool aPersisted,
                              bool aOnlySystemGroup = false);

  // 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();

  Element* GetRootElementInternal() const;
  void DoNotifyPossibleTitleChange();

  void SetPageUnloadingEventTimeStamp()
  {
    MOZ_ASSERT(!mPageUnloadingEventTimeStamp);
    mPageUnloadingEventTimeStamp = mozilla::TimeStamp::NowLoRes();
  }

  void CleanUnloadEventsTimeStamp()
  {
    MOZ_ASSERT(mPageUnloadingEventTimeStamp);
    mPageUnloadingEventTimeStamp = mozilla::TimeStamp();
  }

  /**
   * Clears any Servo element data stored on Elements in the document.
   */
  void ClearStaleServoData();

  /**
   * Returns the top window root from the outer window.
   */
  already_AddRefed<nsPIWindowRoot> GetWindowRoot();

private:
  class SelectorCacheKey
  {
    public:
      explicit SelectorCacheKey(const nsAString& aString) : mKey(aString)
      {
        MOZ_COUNT_CTOR(SelectorCacheKey);
      }

      nsString mKey;
      nsExpirationState mState;

      nsExpirationState* GetExpirationState() { return &mState; }

      ~SelectorCacheKey()
      {
        MOZ_COUNT_DTOR(SelectorCacheKey);
      }
  };

  class SelectorCacheKeyDeleter;

public:
  class SelectorCache final
    : public nsExpirationTracker<SelectorCacheKey, 4>
  {
  public:
    using SelectorList = mozilla::UniquePtr<RawServoSelectorList>;

    explicit SelectorCache(nsIEventTarget* aEventTarget);

    void CacheList(const nsAString& aSelector, SelectorList aSelectorList)
    {
      MOZ_ASSERT(NS_IsMainThread());
      SelectorCacheKey* key = new SelectorCacheKey(aSelector);
      mTable.Put(key->mKey, std::move(aSelectorList));
      AddObject(key);
    }

    void NotifyExpired(SelectorCacheKey* aSelector) final;

    // We do not call MarkUsed because it would just slow down lookups and
    // because we're OK expiring things after a few seconds even if they're
    // being used.  Returns whether we actually had an entry for aSelector.
    //
    // If we have an entry and the selector list returned has a null
    // RawServoSelectorList*, that indicates that aSelector has already been
    // parsed and is not a syntactically valid selector.
    SelectorList* GetList(const nsAString& aSelector)
    {
      return mTable.GetValue(aSelector);
    }

    ~SelectorCache();

  private:
    nsDataHashtable<nsStringHashKey, SelectorList> mTable;
  };

  SelectorCache& GetSelectorCache() {
    if (!mSelectorCache) {
      mSelectorCache =
        mozilla::MakeUnique<SelectorCache>(
          EventTargetFor(mozilla::TaskCategory::Other));
    }
    return *mSelectorCache;
  }
  // Get the root <html> element, or return null if there isn't one (e.g.
  // if the root isn't <html>)
  Element* GetHtmlElement() const;
  // Returns the first child of GetHtmlContent which has the given tag,
  // or nullptr if that doesn't exist.
  Element* GetHtmlChildElement(nsAtom* aTag);
  // Get the canonical <body> element, or return null if there isn't one (e.g.
  // if the root isn't <html> or if the <body> isn't there)
  mozilla::dom::HTMLBodyElement* GetBodyElement();
  // Get the canonical <head> element, or return null if there isn't one (e.g.
  // if the root isn't <html> or if the <head> isn't there)
  Element* GetHeadElement() {
    return GetHtmlChildElement(nsGkAtoms::head);
  }
  // Get the "body" in the sense of document.body: The first <body> or
  // <frameset> that's a child of a root <html>
  nsGenericHTMLElement* GetBody();
  // Set the "body" in the sense of document.body.
  void SetBody(nsGenericHTMLElement* aBody, mozilla::ErrorResult& rv);
  // Get the "head" element in the sense of document.head.
  mozilla::dom::HTMLSharedElement* GetHead();

  /**
   * Accessors to the collection of stylesheets owned by this document.
   * Style sheets are ordered, most significant last.
   */

  mozilla::dom::StyleSheetList* StyleSheets()
  {
    return &DocumentOrShadowRoot::EnsureDOMStyleSheets();
  }

  void InsertSheetAt(size_t aIndex, mozilla::StyleSheet&);

  /**
   * Replace the stylesheets in aOldSheets with the stylesheets in
   * aNewSheets. The two lists must have equal length, and the sheet
   * at positon J in the first list will be replaced by the sheet at
   * position J in the second list.  Some sheets in the second list
   * may be null; if so the corresponding sheets in the first list
   * will simply be removed.
   */
  void UpdateStyleSheets(
      nsTArray<RefPtr<mozilla::StyleSheet>>& aOldSheets,
      nsTArray<RefPtr<mozilla::StyleSheet>>& aNewSheets);

  /**
   * Add a stylesheet to the document
   *
   * TODO(emilio): This is only used by parts of editor that are no longer in
   * use by m-c or c-c, so remove.
   */
  void AddStyleSheet(mozilla::StyleSheet* aSheet)
  {
    MOZ_ASSERT(aSheet);
    InsertSheetAt(SheetCount(), *aSheet);
  }

  /**
   * Remove a stylesheet from the document
   */
  void RemoveStyleSheet(mozilla::StyleSheet* aSheet);

  /**
   * Notify the document that the applicable state of the sheet changed
   * and that observers should be notified and style sets updated
   */
  void SetStyleSheetApplicableState(mozilla::StyleSheet* aSheet,
                                    bool aApplicable);

  enum additionalSheetType {
    eAgentSheet,
    eUserSheet,
    eAuthorSheet,
    AdditionalSheetTypeCount
  };

  nsresult LoadAdditionalStyleSheet(additionalSheetType aType,
                                    nsIURI* aSheetURI);
  nsresult AddAdditionalStyleSheet(additionalSheetType aType,
                                   mozilla::StyleSheet* aSheet);
  void RemoveAdditionalStyleSheet(additionalSheetType aType, nsIURI* sheetURI);

  mozilla::StyleSheet* GetFirstAdditionalAuthorSheet()
  {
    return mAdditionalSheets[eAuthorSheet].SafeElementAt(0);
  }

  /**
   * Assuming that aDocSheets is an array of document-level style
   * sheets for this document, returns the index that aSheet should
   * be inserted at to maintain document ordering.
   *
   * Type T has to cast to StyleSheet*.
   *
   * Defined in nsIDocumentInlines.h.
   */
  template<typename T>
  size_t FindDocStyleSheetInsertionPoint(const nsTArray<T>& aDocSheets,
                                         const mozilla::StyleSheet& aSheet);

  /**
   * Get this document's CSSLoader.  This is guaranteed to not return null.
   */
  mozilla::css::Loader* CSSLoader() const {
    return mCSSLoader;
  }

  /**
   * Get this document's StyleImageLoader.  This is guaranteed to not return null.
   */
  mozilla::css::ImageLoader* StyleImageLoader() const {
    return mStyleImageLoader;
  }

  /**
   * Get the channel that was passed to StartDocumentLoad or Reset for this
   * document.  Note that this may be null in some cases (eg if
   * StartDocumentLoad or Reset were never called)
   */
  nsIChannel* GetChannel() const
  {
    return mChannel;
  }

  /**
   * Get this document's attribute stylesheet.  May return null if
   * there isn't one.
   */
  nsHTMLStyleSheet* GetAttributeStyleSheet() const {
    return mAttrStyleSheet;
  }

  /**
   * Get this document's inline style sheet.  May return null if there
   * isn't one
   */
  nsHTMLCSSStyleSheet* GetInlineStyleSheet() const {
    return mStyleAttrStyleSheet;
  }

  virtual void SetScriptGlobalObject(nsIScriptGlobalObject* aGlobalObject);

  /**
   * Get/set the object from which the context for the event/script handling can
   * be got. Normally GetScriptHandlingObject() returns the same object as
   * GetScriptGlobalObject(), but if the document is loaded as data,
   * non-null may be returned, even if GetScriptGlobalObject() returns null.
   * aHasHadScriptHandlingObject is set true if document has had the object
   * for event/script handling. Do not process any events/script if the method
   * returns null, but aHasHadScriptHandlingObject is true.
   */
  nsIScriptGlobalObject*
    GetScriptHandlingObject(bool& aHasHadScriptHandlingObject) const
  {
    aHasHadScriptHandlingObject = mHasHadScriptHandlingObject;
    return mScriptGlobalObject ? mScriptGlobalObject.get() :
                                 GetScriptHandlingObjectInternal();
  }
  void SetScriptHandlingObject(nsIScriptGlobalObject* aScriptObject);

  /**
   * Get the object that is used as the scope for all of the content
   * wrappers whose owner document is this document. Unlike the script global
   * object, this will only return null when the global object for this
   * document is truly gone. Use this object when you're trying to find a
   * content wrapper in XPConnect.
   */
  nsIGlobalObject* GetScopeObject() const;
  void SetScopeObject(nsIGlobalObject* aGlobal);

  /**
   * Return the window containing the document (the outer window).
   */
  nsPIDOMWindowOuter *GetWindow() const
  {
    return mWindow ? mWindow->GetOuterWindow() : GetWindowInternal();
  }

  bool IsInBackgroundWindow() const
  {
    auto* outer = mWindow ? mWindow->GetOuterWindow() : nullptr;
    return outer && outer->IsBackground();
  }

  /**
   * Return the inner window used as the script compilation scope for
   * this document. If you're not absolutely sure you need this, use
   * GetWindow().
   */
  nsPIDOMWindowInner* GetInnerWindow() const
  {
    return mRemovedFromDocShell ? nullptr : mWindow;
  }

  /**
   * Return the outer window ID.
   */
  uint64_t OuterWindowID() const
  {
    nsPIDOMWindowOuter* window = GetWindow();
    return window ? window->WindowID() : 0;
  }

  /**
   * Return the inner window ID.
   */
  uint64_t InnerWindowID() const
  {
    nsPIDOMWindowInner* window = GetInnerWindow();
    return window ? window->WindowID() : 0;
  }

  bool IsTopLevelWindowInactive() const;

  /**
   * Get the script loader for this document
   */
  mozilla::dom::ScriptLoader* ScriptLoader()
  {
    return mScriptLoader;
  }

  /**
   * Add/Remove an element to the document's id and name hashes
   */
  void AddToIdTable(Element* aElement, nsAtom* aId);
  void RemoveFromIdTable(Element* aElement, nsAtom* aId);
  void AddToNameTable(Element* aElement, nsAtom* aName);
  void RemoveFromNameTable(Element* aElement, nsAtom* aName);

  /**
   * Returns all elements in the fullscreen stack in the insertion order.
   */
  nsTArray<Element*> GetFullscreenStack() const;

  /**
   * Asynchronously requests that the document make aElement the fullscreen
   * element, and move into fullscreen mode. The current fullscreen element
   * (if any) is pushed onto the fullscreen element stack, and it can be
   * returned to fullscreen status by calling RestorePreviousFullScreenState().
   *
   * Note that requesting fullscreen in a document also makes the element which
   * contains this document in this document's parent document fullscreen. i.e.
   * the <iframe> or <browser> that contains this document is also mode
   * fullscreen. This happens recursively in all ancestor documents.
   */
  void AsyncRequestFullScreen(mozilla::UniquePtr<FullscreenRequest>&&);

  // 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();

  /**
   * Called when a frame in a child process has entered fullscreen or when a
   * fullscreen frame in a child process changes to another origin.
   * aFrameElement is the frame element which contains the child-process
   * fullscreen document.
   */
  nsresult RemoteFrameFullscreenChanged(mozilla::dom::Element* aFrameElement);

  /**
   * Called when a frame in a remote child document has rolled back fullscreen
   * so that all its fullscreen element stacks are empty; we must continue the
   * rollback in this parent process' doc tree branch which is fullscreen.
   * Note that only one branch of the document tree can have its documents in
   * fullscreen state at one time. We're in inconsistent state if a
   * fullscreen document has a parent and that parent isn't fullscreen. We
   * preserve this property across process boundaries.
   */
   nsresult RemoteFrameFullscreenReverted();

  /**
   * Restores the previous full-screen element to full-screen status. If there
   * is no former full-screen element, this exits full-screen, moving the
   * top-level browser window out of full-screen mode.
   */
  void RestorePreviousFullScreenState();

  /**
   * Returns true if this document is a fullscreen leaf document, i.e. it
   * is in fullscreen mode and has no fullscreen children.
   */
  bool IsFullscreenLeaf();

  /**
   * Returns the document which is at the root of this document's branch
   * in the in-process document tree. Returns nullptr if the document isn't
   * fullscreen.
   */
  nsIDocument* GetFullscreenRoot();

  /**
   * Sets the fullscreen root to aRoot. This stores a weak reference to aRoot
   * in this document.
   */
  void SetFullscreenRoot(nsIDocument* aRoot);

  /**
   * Synchronously cleans up the fullscreen state on the given document.
   *
   * Calling this without performing fullscreen transition could lead
   * to undesired effect (the transition happens after document state
   * flips), hence it should only be called either by nsGlobalWindow
   * when we have performed the transition, or when it is necessary to
   * clean up the state immediately. Otherwise, AsyncExitFullscreen()
   * should be called instead.
   *
   * aDocument must not be null.
   */
  static void ExitFullscreenInDocTree(nsIDocument* aDocument);

  /**
   * Ask the document to exit fullscreen state asynchronously.
   *
   * Different from ExitFullscreenInDocTree(), this allows the window
   * to perform fullscreen transition first if any.
   *
   * If aDocument is null, it will exit fullscreen from all documents
   * in all windows.
   */
  static void AsyncExitFullscreen(nsIDocument* aDocument);

  /**
   * Handles any pending fullscreen in aDocument or its subdocuments.
   *
   * Returns whether there is any fullscreen request handled.
   */
  static bool HandlePendingFullscreenRequests(nsIDocument* aDocument);

  /**
   * Dispatch fullscreenerror event and report the failure message to
   * the console.
   */
  void DispatchFullscreenError(const char* aMessage);

  void RequestPointerLock(Element* aElement, mozilla::dom::CallerType);
  bool SetPointerLock(Element* aElement, int aCursorStyle);

  static void UnlockPointer(nsIDocument* aDoc = nullptr);

  // ScreenOrientation related APIs

  void SetCurrentOrientation(mozilla::dom::OrientationType aType,
                             uint16_t aAngle)
  {
    mCurrentOrientationType = aType;
    mCurrentOrientationAngle = aAngle;
  }

  uint16_t CurrentOrientationAngle() const
  {
    return mCurrentOrientationAngle;
  }
  mozilla::dom::OrientationType CurrentOrientationType() const
  {
    return mCurrentOrientationType;
  }
  void SetOrientationPendingPromise(mozilla::dom::Promise* aPromise);
  mozilla::dom::Promise* GetOrientationPendingPromise() const
  {
    return mOrientationPendingPromise;
  }

  //----------------------------------------------------------------------

  // Document notification API's

  /**
   * Add a new observer of document change notifications. Whenever
   * content is changed, appended, inserted or removed the observers are
   * informed.  An observer that is already observing the document must
   * not be added without being removed first.
   */
  void AddObserver(nsIDocumentObserver* aObserver);

  /**
   * Remove an observer of document change notifications. This will
   * return false if the observer cannot be found.
   */
  bool RemoveObserver(nsIDocumentObserver* aObserver);

  // Observation hooks used to propagate notifications to document observers.
  // BeginUpdate must be called before any batch of modifications of the
  // content model or of style data, EndUpdate must be called afterward.
  // To make this easy and painless, use the mozAutoDocUpdate helper class.
  void BeginUpdate();
  virtual void EndUpdate() = 0;
  uint32_t UpdateNestingLevel() { return mUpdateNestLevel; }

  virtual void BeginLoad() = 0;
  virtual void EndLoad() = 0;

  enum ReadyState { READYSTATE_UNINITIALIZED = 0, READYSTATE_LOADING = 1, READYSTATE_INTERACTIVE = 3, READYSTATE_COMPLETE = 4};
  void SetReadyStateInternal(ReadyState rs);
  ReadyState GetReadyStateEnum()
  {
    return mReadyState;
  }

  // notify that a content node changed state.  This must happen under
  // a scriptblocker but NOT within a begin/end update.
  void ContentStateChanged(
      nsIContent* aContent, mozilla::EventStates aStateMask);

  // Notify that a document state has changed.
  // This should only be called by callers whose state is also reflected in the
  // implementation of nsDocument::GetDocumentState.
  void DocumentStatesChanged(mozilla::EventStates aStateMask);

  // Observation hooks for style data to propagate notifications
  // to document observers
  void StyleRuleChanged(mozilla::StyleSheet* aStyleSheet,
                        mozilla::css::Rule* aStyleRule);
  void StyleRuleAdded(mozilla::StyleSheet* aStyleSheet,
                      mozilla::css::Rule* aStyleRule);
  void StyleRuleRemoved(mozilla::StyleSheet* aStyleSheet,
                        mozilla::css::Rule* aStyleRule);

  /**
   * Flush notifications for this document and its parent documents
   * (since those may affect the layout of this one).
   */
  void FlushPendingNotifications(mozilla::FlushType aType);

  /**
   * Another variant of the above FlushPendingNotifications.  This function
   * takes a ChangesToFlush to specify whether throttled animations are flushed
   * or not.
   * If in doublt, use the above FlushPendingNotifications.
   */
  void FlushPendingNotifications(mozilla::ChangesToFlush aFlush);

  /**
   * Calls FlushPendingNotifications on any external resources this document
   * has. If this document has no external resources or is an external resource
   * itself this does nothing. This should only be called with
   * aType >= FlushType::Style.
   */
  void FlushExternalResources(mozilla::FlushType aType);

  // Triggers an update of <svg:use> element shadow trees.
  void UpdateSVGUseElementShadowTrees()
  {
    if (mSVGUseElementsNeedingShadowTreeUpdate.IsEmpty()) {
      return;
    }
    DoUpdateSVGUseElementShadowTrees();
  }

  nsBindingManager* BindingManager() const
  {
    return mNodeInfoManager->GetBindingManager();
  }

  /**
   * Only to be used inside Gecko, you can't really do anything with the
   * pointer outside Gecko anyway.
   */
  nsNodeInfoManager* NodeInfoManager() const
  {
    return mNodeInfoManager;
  }

  /**
   * Reset the document using the given channel and loadgroup.  This works
   * like ResetToURI, but also sets the document's channel to aChannel.
   * The principal of the document will be set from the channel.
   */
  virtual void Reset(nsIChannel* aChannel, nsILoadGroup* aLoadGroup);

  /**
   * Reset this document to aURI, aLoadGroup, and aPrincipal.  aURI must not be
   * null.  If aPrincipal is null, a codebase principal based on aURI will be
   * used.
   */
  virtual void ResetToURI(nsIURI* aURI,
                          nsILoadGroup* aLoadGroup,
                          nsIPrincipal* aPrincipal);

  /**
   * Set the container (docshell) for this document. Virtual so that
   * docshell can call it.
   */
  virtual void SetContainer(nsDocShell* aContainer);

  /**
   * Get the container (docshell) for this document.
   */
  virtual nsISupports* GetContainer() const;

  /**
   * Get the container's load context for this document.
   */
  nsILoadContext* GetLoadContext() const;

  /**
   * Get docshell the for this document.
   */
  nsIDocShell* GetDocShell() const;

  /**
   * Set and get XML declaration. If aVersion is null there is no declaration.
   * aStandalone takes values -1, 0 and 1 indicating respectively that there
   * was no standalone parameter in the declaration, that it was given as no,
   * or that it was given as yes.
   */
  void SetXMLDeclaration(const char16_t* aVersion,
                         const char16_t* aEncoding,
                         const int32_t aStandalone);
  void GetXMLDeclaration(nsAString& aVersion,
                         nsAString& aEncoding,
                         nsAString& Standalone);

  /**
   * Returns true if this is what HTML 5 calls an "HTML document" (for example
   * regular HTML document with Content-Type "text/html", image documents and
   * media documents).  Returns false for XHTML and any other documents parsed
   * by the XML parser.
   */
  bool IsHTMLDocument() const
  {
    return mType == eHTML;
  }
  bool IsHTMLOrXHTML() const
  {
    return mType == eHTML || mType == eXHTML;
  }
  bool IsXMLDocument() const
  {
    return !IsHTMLDocument();
  }
  bool IsSVGDocument() const
  {
    return mType == eSVG;
  }
  bool IsXULDocument() const
  {
    return mType == eXUL;
  }
  bool IsUnstyledDocument()
  {
    return IsLoadedAsData() || IsLoadedAsInteractiveData();
  }
  bool LoadsFullXULStyleSheetUpFront()
  {
    if (IsXULDocument()) {
      return true;
    }
    if (IsSVGDocument()) {
      return false;
    }
    return AllowXULXBL();
  }

  bool IsScriptEnabled();

  bool IsTopLevelContentDocument() const { return mIsTopLevelContentDocument; }
  void SetIsTopLevelContentDocument(bool aIsTopLevelContentDocument)
  {
    mIsTopLevelContentDocument = aIsTopLevelContentDocument;
    // When a document is set as TopLevelContentDocument, it must be
    // allowpaymentrequest. We handle the false case while a document is appended
    // in SetSubDocumentFor
    if (aIsTopLevelContentDocument) {
      SetAllowPaymentRequest(true);
    }
  }

  bool IsContentDocument() const { return mIsContentDocument; }
  void SetIsContentDocument(bool aIsContentDocument)
  {
    mIsContentDocument = aIsContentDocument;
  }

  /**
   * Create an element with the specified name, prefix and namespace ID.
   * Returns null if element name parsing failed.
   */
  already_AddRefed<Element> CreateElem(const nsAString& aName,
                                       nsAtom* aPrefix,
                                       int32_t aNamespaceID,
                                       const nsAString* aIs = nullptr);

  /**
   * Get the security info (i.e. SSL state etc) that the document got
   * from the channel/document that created the content of the
   * document.
   *
   * @see nsIChannel
   */
  nsISupports *GetSecurityInfo()
  {
    return mSecurityInfo;
  }

  /**
   * Get the channel that failed to load and resulted in an error page, if it
   * exists. This is only relevant to error pages.
   */
  nsIChannel* GetFailedChannel() const
  {
    return mFailedChannel;
  }

  /**
   * Set the channel that failed to load and resulted in an error page.
   * This is only relevant to error pages.
   */
  void SetFailedChannel(nsIChannel* aChannel)
  {
    mFailedChannel = aChannel;
  }

  /**
   * Returns the default namespace ID used for elements created in this
   * document.
   */
  int32_t GetDefaultNamespaceID() const
  {
    return mDefaultElementType;
  }

  void DeleteAllProperties();
  void DeleteAllPropertiesFor(nsINode* aNode);

  nsPropertyTable& PropertyTable()
  {
    return mPropertyTable;
  }

  /**
   * Sets the ID used to identify this part of the multipart document
   */
  void SetPartID(uint32_t aID) {
    mPartID = aID;
  }

  /**
   * Return the ID used to identify this part of the multipart document
   */
  uint32_t GetPartID() const {
    return mPartID;
  }

  /**
   * Sanitize the document by resetting all input elements and forms that have
   * autocomplete=off to their default values.
   */
  void Sanitize();

  /**
   * Enumerate all subdocuments.
   * The enumerator callback should return true to continue enumerating, or
   * false to stop.  This will never get passed a null aDocument.
   */
  typedef bool (*nsSubDocEnumFunc)(nsIDocument *aDocument, void *aData);
  void EnumerateSubDocuments(nsSubDocEnumFunc aCallback, void *aData);

  /**
   * Collect all the descendant documents for which |aCalback| returns true.
   * The callback function must not mutate any state for the given document.
   */
  typedef bool (*nsDocTestFunc)(const nsIDocument* aDocument);
  void CollectDescendantDocuments(
    nsTArray<nsCOMPtr<nsIDocument>>& aDescendants,
    nsDocTestFunc aCallback) const;

  /**
   * Check whether it is safe to cache the presentation of this document
   * and all of its subdocuments. This method checks the following conditions
   * recursively:
   *  - Some document types, such as plugin documents, cannot be safely cached.
   *  - If there are any pending requests, we don't allow the presentation
   *    to be cached.  Ideally these requests would be suspended and resumed,
   *    but that is difficult in some cases, such as XMLHttpRequest.
   *  - If there are any beforeunload or unload listeners, we must fire them
   *    for correctness, but this likely puts the document into a state where
   *    it would not function correctly if restored.
   *
   * |aNewRequest| should be the request for a new document which will
   * replace this document in the docshell.  The new document's request
   * will be ignored when checking for active requests.  If there is no
   * request associated with the new document, this parameter may be null.
   */
  virtual bool CanSavePresentation(nsIRequest* aNewRequest);

  /**
   * Notify the document that its associated ContentViewer is being destroyed.
   * This releases circular references so that the document can go away.
   * Destroy() is only called on documents that have a content viewer.
   */
  virtual void Destroy() = 0;

  /**
   * Notify the document that its associated ContentViewer is no longer
   * the current viewer for the docshell. The document might still
   * be rendered in "zombie state" until the next document is ready.
   * The document should save form control state.
   */
  virtual void RemovedFromDocShell() = 0;

  /**
   * Get the layout history state that should be used to save and restore state
   * for nodes in this document.  This may return null; if that happens state
   * saving and restoration is not possible.
   */
  already_AddRefed<nsILayoutHistoryState> GetLayoutHistoryState() const;

  /**
   * Methods that can be used to prevent onload firing while an event that
   * should block onload is posted.  onload is guaranteed to not fire until
   * either all calls to BlockOnload() have been matched by calls to
   * UnblockOnload() or the load has been stopped altogether (by the user
   * pressing the Stop button, say).
   */
  virtual void BlockOnload() = 0;
  /**
   * @param aFireSync whether to fire onload synchronously.  If false,
   * onload will fire asynchronously after all onload blocks have been
   * removed.  It will NOT fire from inside UnblockOnload.  If true,
   * onload may fire from inside UnblockOnload.
   */
  virtual void UnblockOnload(bool aFireSync) = 0;

  void BlockDOMContentLoaded()
  {
    ++mBlockDOMContentLoaded;
  }

  void UnblockDOMContentLoaded();

  /**
   * Notification that the page has been shown, for documents which are loaded
   * into a DOM window.  This corresponds to the completion of document load,
   * or to the page's presentation being restored into an existing DOM window.
   * This notification fires applicable DOM events to the content window.  See
   * PageTransitionEvent.webidl for a description of the |aPersisted|
   * parameter. If aDispatchStartTarget is null, the pageshow event is
   * dispatched on the ScriptGlobalObject for this document, otherwise it's
   * dispatched on aDispatchStartTarget. If |aOnlySystemGroup| is true, the
   * event is only dispatched to listeners in the system group.
   * Note: if aDispatchStartTarget isn't null, the showing state of the
   * document won't be altered.
   */
  virtual void OnPageShow(bool aPersisted,
                          mozilla::dom::EventTarget* aDispatchStartTarget,
                          bool aOnlySystemGroup = false);

  /**
   * Notification that the page has been hidden, for documents which are loaded
   * into a DOM window.  This corresponds to the unloading of the document, or
   * to the document's presentation being saved but removed from an existing
   * DOM window.  This notification fires applicable DOM events to the content
   * window.  See PageTransitionEvent.webidl for a description of the
   * |aPersisted| parameter. If aDispatchStartTarget is null, the pagehide
   * event is dispatched on the ScriptGlobalObject for this document,
   * otherwise it's dispatched on aDispatchStartTarget. If |aOnlySystemGroup| is
   * true, the event is only dispatched to listeners in the system group.
   * Note: if aDispatchStartTarget isn't null, the showing state of the
   * document won't be altered.
   */
  void OnPageHide(bool aPersisted,
                  mozilla::dom::EventTarget* aDispatchStartTarget,
                  bool aOnlySystemGroup = false);

  /*
   * We record the set of links in the document that are relevant to
   * style.
   */
  /**
   * Notification that an element is a link that is relevant to style.
   */
  void AddStyleRelevantLink(mozilla::dom::Link* aLink)
  {
    NS_ASSERTION(aLink, "Passing in a null link.  Expect crashes RSN!");
#ifdef DEBUG
    nsPtrHashKey<mozilla::dom::Link>* entry = mStyledLinks.GetEntry(aLink);
    NS_ASSERTION(!entry, "Document already knows about this Link!");
    mStyledLinksCleared = false;
#endif
    mStyledLinks.PutEntry(aLink);
  }

  /**
   * Notification that an element is a link and its URI might have been
   * changed or the element removed. If the element is still a link relevant
   * to style, then someone must ensure that AddStyleRelevantLink is
   * (eventually) called on it again.
   */
  void ForgetLink(mozilla::dom::Link* aLink)
  {
    NS_ASSERTION(aLink, "Passing in a null link.  Expect crashes RSN!");
#ifdef DEBUG
    nsPtrHashKey<mozilla::dom::Link>* entry = mStyledLinks.GetEntry(aLink);
    NS_ASSERTION(entry || mStyledLinksCleared,
                 "Document knows nothing about this Link!");
#endif
    mStyledLinks.RemoveEntry(aLink);
  }

  // Refreshes the hrefs of all the links in the document.
  void RefreshLinkHrefs();

  /**
   * Resets and removes a box object from the document's box object cache
   *
   * @param aElement canonical nsIContent pointer of the box object's element
   */
  void ClearBoxObjectFor(nsIContent* aContent);

  /**
   * Get the box object for an element. This is not exposed through a
   * scriptable interface except for XUL documents.
   */
  already_AddRefed<mozilla::dom::BoxObject>
    GetBoxObjectFor(mozilla::dom::Element* aElement, mozilla::ErrorResult& aRv);

  /**
   * Support for window.matchMedia()
   */

  already_AddRefed<mozilla::dom::MediaQueryList>
    MatchMedia(const nsAString& aMediaQueryList,
               mozilla::dom::CallerType aCallerType);

  mozilla::LinkedList<mozilla::dom::MediaQueryList>& MediaQueryLists() {
    return mDOMMediaQueryLists;
  }

  /**
   * Get the compatibility mode for this document
   */
  nsCompatibility GetCompatibilityMode() const {
    return mCompatMode;
  }

  /**
   * Check whether we've ever fired a DOMTitleChanged event for this
   * document.
   */
  bool HaveFiredDOMTitleChange() const
  {
    return mHaveFiredTitleChange;
  }

  Element* GetAnonymousElementByAttribute(nsIContent* aElement,
                                          nsAtom* aAttrName,
                                          const nsAString& aAttrValue) const;

  nsresult NodesFromRectHelper(float aX, float aY,
                               float aTopSize, float aRightSize,
                               float aBottomSize, float aLeftSize,
                               bool aIgnoreRootScrollFrame,
                               bool aFlushLayout,
                               nsINodeList** aReturn);

  /**
   * See FlushSkinBindings on nsBindingManager
   */
  void FlushSkinBindings();

  /**
   * To batch DOMSubtreeModified, document needs to be informed when
   * a mutation event might be dispatched, even if the event isn't actually
   * created because there are no listeners for it.
   *
   * @param aTarget is the target for the mutation event.
   */
  void MayDispatchMutationEvent(nsINode* aTarget)
  {
    if (mSubtreeModifiedDepth > 0) {
      mSubtreeModifiedTargets.AppendObject(aTarget);
    }
  }

  /**
   * Marks as not-going-to-be-collected for the given generation of
   * cycle collection.
   */
  void MarkUncollectableForCCGeneration(uint32_t aGeneration)
  {
    mMarkedCCGeneration = aGeneration;
  }

  /**
   * Gets the cycle collector generation this document is marked for.
   */
  uint32_t GetMarkedCCGeneration()
  {
    return mMarkedCCGeneration;
  }

  /**
   * Returns whether this document is cookie averse. See
   * https://html.spec.whatwg.org/multipage/dom.html#cookie-averse-document-object
   */
  bool IsCookieAverse() const
  {
    // If we are a document that "has no browsing context."
    if (!GetInnerWindow()) {
      return true;
    }

    // If we are a document "whose URL's scheme is not a network scheme."
    // NB: Explicitly allow file: URIs to store cookies.
    nsCOMPtr<nsIURI> codebaseURI;
    NodePrincipal()->GetURI(getter_AddRefs(codebaseURI));

    if (!codebaseURI) {
      return true;
    }

    nsAutoCString scheme;
    codebaseURI->GetScheme(scheme);
    return !scheme.EqualsLiteral("http") &&
           !scheme.EqualsLiteral("https") &&
           !scheme.EqualsLiteral("ftp") &&
           !scheme.EqualsLiteral("file");
  }

  bool IsLoadedAsData()
  {
    return mLoadedAsData;
  }

  bool IsLoadedAsInteractiveData()
  {
    return mLoadedAsInteractiveData;
  }

  bool MayStartLayout()
  {
    return mMayStartLayout;
  }

  virtual void SetMayStartLayout(bool aMayStartLayout);

  already_AddRefed<nsIDocumentEncoder> GetCachedEncoder();

  void SetCachedEncoder(already_AddRefed<nsIDocumentEncoder> aEncoder);

  // In case of failure, the document really can't initialize the frame loader.
<