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diff --git a/layout/style/MappedDeclarations.h b/layout/style/MappedDeclarations.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/. */
+
+/* Representation of a declaration block used for attribute mapping */
+
+#ifndef mozilla_MappedDeclarations_h
+#define mozilla_MappedDeclarations_h
+
+#include "mozilla/FontPropertyTypes.h"
+#include "mozilla/ServoBindingTypes.h"
+#include "mozilla/ServoBindings.h"
+#include "nsCSSPropertyID.h"
+#include "nsCSSValue.h"
+#include "nsColor.h"
+
+class nsAttrValue;
+
+namespace mozilla {
+
+// This provides a convenient interface for attribute mappers
+// (MapAttributesIntoRule) to modify the presentation attribute declaration
+// block for a given element.
+class MappedDeclarations final {
+ public:
+  explicit MappedDeclarations(dom::Document* aDoc,
+                              already_AddRefed<RawServoDeclarationBlock> aDecls)
+      : mDocument(aDoc), mDecl(aDecls) {
+    MOZ_ASSERT(mDecl);
+  }
+
+  ~MappedDeclarations() { MOZ_ASSERT(!mDecl, "Forgot to take the block?"); }
+
+  dom::Document* Document() { return mDocument; }
+
+  already_AddRefed<RawServoDeclarationBlock> TakeDeclarationBlock() {
+    MOZ_ASSERT(mDecl);
+    return mDecl.forget();
+  }
+
+  // Check if we already contain a certain longhand
+  bool PropertyIsSet(nsCSSPropertyID aId) const {
+    return Servo_DeclarationBlock_PropertyIsSet(mDecl, aId);
+  }
+
+  // Set a property to an identifier (string)
+  void SetIdentStringValue(nsCSSPropertyID aId, const nsString& aValue) {
+    RefPtr<nsAtom> atom = NS_AtomizeMainThread(aValue);
+    SetIdentAtomValue(aId, atom);
+  }
+
+  void SetIdentStringValueIfUnset(nsCSSPropertyID aId, const nsString& aValue) {
+    if (!PropertyIsSet(aId)) {
+      SetIdentStringValue(aId, aValue);
+    }
+  }
+
+  void SetIdentAtomValue(nsCSSPropertyID aId, nsAtom* aValue);
+
+  void SetIdentAtomValueIfUnset(nsCSSPropertyID aId, nsAtom* aValue) {
+    if (!PropertyIsSet(aId)) {
+      SetIdentAtomValue(aId, aValue);
+    }
+  }
+
+  // Set a property to a keyword (usually NS_STYLE_* or StyleFoo::*)
+  void SetKeywordValue(nsCSSPropertyID aId, int32_t aValue) {
+    Servo_DeclarationBlock_SetKeywordValue(mDecl, aId, aValue);
+  }
+
+  void SetKeywordValueIfUnset(nsCSSPropertyID aId, int32_t aValue) {
+    if (!PropertyIsSet(aId)) {
+      SetKeywordValue(aId, aValue);
+    }
+  }
+
+  template <typename T,
+            typename = typename std::enable_if<std::is_enum<T>::value>::type>
+  void SetKeywordValue(nsCSSPropertyID aId, T aValue) {
+    static_assert(EnumTypeFitsWithin<T, int32_t>::value,
+                  "aValue must be an enum that fits within 32 bits");
+    SetKeywordValue(aId, static_cast<int32_t>(aValue));
+  }
+  template <typename T,
+            typename = typename std::enable_if<std::is_enum<T>::value>::type>
+  void SetKeywordValueIfUnset(nsCSSPropertyID aId, T aValue) {
+    static_assert(EnumTypeFitsWithin<T, int32_t>::value,
+                  "aValue must be an enum that fits within 32 bits");
+    SetKeywordValueIfUnset(aId, static_cast<int32_t>(aValue));
+  }
+
+  // Set a property to an integer value
+  void SetIntValue(nsCSSPropertyID aId, int32_t aValue) {
+    Servo_DeclarationBlock_SetIntValue(mDecl, aId, aValue);
+  }
+
+  // Set "math-depth: <integer>" or "math-depth: add(<integer>)"
+  void SetMathDepthValue(int32_t aValue, bool aIsRelative) {
+    Servo_DeclarationBlock_SetMathDepthValue(mDecl, aValue, aIsRelative);
+  }
+
+  // Set "counter-reset: list-item <integer>".  If aIsReversed is true then
+  // "list-item" instead becomes "reversed(list-item)".
+  void SetCounterResetListItem(int32_t aValue, bool aIsReversed) {
+    Servo_DeclarationBlock_SetCounterResetListItem(mDecl, aValue, aIsReversed);
+  }
+
+  // Set "counter-set: list-item <integer>".
+  void SetCounterSetListItem(int32_t aValue) {
+    Servo_DeclarationBlock_SetCounterSetListItem(mDecl, aValue);
+  }
+
+  // Set a property to a pixel value
+  void SetPixelValue(nsCSSPropertyID aId, float aValue) {
+    Servo_DeclarationBlock_SetPixelValue(mDecl, aId, aValue);
+  }
+
+  void SetPixelValueIfUnset(nsCSSPropertyID aId, float aValue) {
+    if (!PropertyIsSet(aId)) {
+      SetPixelValue(aId, aValue);
+    }
+  }
+
+  void SetLengthValue(nsCSSPropertyID aId, const nsCSSValue& aValue) {
+    MOZ_ASSERT(aValue.IsLengthUnit());
+    Servo_DeclarationBlock_SetLengthValue(mDecl, aId, aValue.GetFloatValue(),
+                                          aValue.GetUnit());
+  }
+
+  // Set a property to a number value
+  void SetNumberValue(nsCSSPropertyID aId, float aValue) {
+    Servo_DeclarationBlock_SetNumberValue(mDecl, aId, aValue);
+  }
+
+  // Set a property to a percent value
+  void SetPercentValue(nsCSSPropertyID aId, float aValue) {
+    Servo_DeclarationBlock_SetPercentValue(mDecl, aId, aValue);
+  }
+
+  void SetPercentValueIfUnset(nsCSSPropertyID aId, float aValue) {
+    if (!PropertyIsSet(aId)) {
+      SetPercentValue(aId, aValue);
+    }
+  }
+
+  // Set a property to `auto`
+  void SetAutoValue(nsCSSPropertyID aId) {
+    Servo_DeclarationBlock_SetAutoValue(mDecl, aId);
+  }
+
+  void SetAutoValueIfUnset(nsCSSPropertyID aId) {
+    if (!PropertyIsSet(aId)) {
+      SetAutoValue(aId);
+    }
+  }
+
+  // Set a property to `currentcolor`
+  void SetCurrentColor(nsCSSPropertyID aId) {
+    Servo_DeclarationBlock_SetCurrentColor(mDecl, aId);
+  }
+
+  void SetCurrentColorIfUnset(nsCSSPropertyID aId) {
+    if (!PropertyIsSet(aId)) {
+      SetCurrentColor(aId);
+    }
+  }
+
+  // Set a property to an RGBA nscolor value
+  void SetColorValue(nsCSSPropertyID aId, nscolor aValue) {
+    Servo_DeclarationBlock_SetColorValue(mDecl, aId, aValue);
+  }
+
+  void SetColorValueIfUnset(nsCSSPropertyID aId, nscolor aValue) {
+    if (!PropertyIsSet(aId)) {
+      SetColorValue(aId, aValue);
+    }
+  }
+
+  // Set font-family to a string
+  void SetFontFamily(const nsACString& aValue) {
+    Servo_DeclarationBlock_SetFontFamily(mDecl, &aValue);
+  }
+
+  // Add a quirks-mode override to the decoration color of elements nested in
+  // <a>
+  void SetTextDecorationColorOverride() {
+    Servo_DeclarationBlock_SetTextDecorationColorOverride(mDecl);
+  }
+
+  void SetBackgroundImage(const nsAttrValue& value);
+
+  void SetAspectRatio(float aWidth, float aHeight) {
+    Servo_DeclarationBlock_SetAspectRatio(mDecl, aWidth, aHeight);
+  }
+
+ private:
+  dom::Document* const mDocument;
+  RefPtr<RawServoDeclarationBlock> mDecl;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_MappedDeclarations_h