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diff --git a/layout/style/nsHTMLStyleSheet.h b/layout/style/nsHTMLStyleSheet.h
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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/. */
+
+/*
+ * style sheet and style rule processor representing data from presentational
+ * HTML attributes
+ */
+
+#ifndef nsHTMLStyleSheet_h_
+#define nsHTMLStyleSheet_h_
+
+#include "nsColor.h"
+#include "nsCOMPtr.h"
+#include "nsAtom.h"
+#include "PLDHashTable.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+#include "nsString.h"
+
+class nsMappedAttributes;
+namespace mozilla {
+struct StyleLockedDeclarationBlock;
+namespace dom {
+class Document;
+} // namespace dom
+} // namespace mozilla
+
+class nsHTMLStyleSheet final {
+ using StyleLockedDeclarationBlock = mozilla::StyleLockedDeclarationBlock;
+
+ public:
+ explicit nsHTMLStyleSheet(mozilla::dom::Document* aDocument);
+
+ void SetOwningDocument(mozilla::dom::Document* aDocument);
+
+ NS_INLINE_DECL_REFCOUNTING(nsHTMLStyleSheet)
+
+ size_t DOMSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ void Reset();
+ nsresult SetLinkColor(nscolor aColor);
+ nsresult SetActiveLinkColor(nscolor aColor);
+ nsresult SetVisitedLinkColor(nscolor aColor);
+
+ const StyleLockedDeclarationBlock* GetServoUnvisitedLinkDecl() const {
+ return mServoUnvisitedLinkDecl;
+ }
+ const StyleLockedDeclarationBlock* GetServoVisitedLinkDecl() const {
+ return mServoVisitedLinkDecl;
+ }
+ const mozilla::StyleLockedDeclarationBlock* GetServoActiveLinkDecl() const {
+ return mServoActiveLinkDecl;
+ }
+
+ // Mapped Attribute management methods
+ already_AddRefed<nsMappedAttributes> UniqueMappedAttributes(
+ nsMappedAttributes* aMapped);
+ void DropMappedAttributes(nsMappedAttributes* aMapped);
+ // For each mapped presentation attribute in the cache, resolve
+ // the attached DeclarationBlock by running the mapping
+ // and converting the ruledata to Servo specified values.
+ void CalculateMappedServoDeclarations();
+
+ private:
+ nsHTMLStyleSheet(const nsHTMLStyleSheet& aCopy) = delete;
+ nsHTMLStyleSheet& operator=(const nsHTMLStyleSheet& aCopy) = delete;
+
+ ~nsHTMLStyleSheet() = default;
+
+ // Implementation of SetLink/VisitedLink/ActiveLinkColor
+ nsresult ImplLinkColorSetter(
+ RefPtr<mozilla::StyleLockedDeclarationBlock>& aDecl, nscolor aColor);
+
+ public: // for mLangRuleTable structures only
+ private:
+ mozilla::dom::Document* mDocument;
+ RefPtr<StyleLockedDeclarationBlock> mServoUnvisitedLinkDecl;
+ RefPtr<StyleLockedDeclarationBlock> mServoVisitedLinkDecl;
+ RefPtr<StyleLockedDeclarationBlock> mServoActiveLinkDecl;
+
+ PLDHashTable mMappedAttrTable;
+ // Whether or not the mapped attributes table
+ // has been changed since the last call to
+ // CalculateMappedServoDeclarations()
+ bool mMappedAttrsDirty;
+};
+
+#endif /* !defined(nsHTMLStyleSheet_h_) */