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diff --git a/dom/animation/Keyframe.h b/dom/animation/Keyframe.h
new file mode 100644
index 0000000000..8a2fd7c269
--- /dev/null
+++ b/dom/animation/Keyframe.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/. */
+
+#ifndef mozilla_dom_Keyframe_h
+#define mozilla_dom_Keyframe_h
+
+#include "nsCSSValue.h"
+#include "nsTArray.h"
+#include "mozilla/dom/BaseKeyframeTypesBinding.h"  // CompositeOperationOrAuto
+#include "mozilla/AnimatedPropertyID.h"
+#include "mozilla/ServoStyleConsts.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/RefPtr.h"
+
+namespace mozilla {
+struct StyleLockedDeclarationBlock;
+
+/**
+ * A property-value pair specified on a keyframe.
+ */
+struct PropertyValuePair {
+  explicit PropertyValuePair(const AnimatedPropertyID& aProperty)
+      : mProperty(aProperty) {}
+
+  PropertyValuePair(const AnimatedPropertyID& aProperty,
+                    RefPtr<StyleLockedDeclarationBlock>&& aValue)
+      : mProperty(aProperty), mServoDeclarationBlock(std::move(aValue)) {
+    MOZ_ASSERT(mServoDeclarationBlock, "Should be valid property value");
+  }
+
+  AnimatedPropertyID mProperty;
+
+  // The specified value when using the Servo backend.
+  RefPtr<StyleLockedDeclarationBlock> mServoDeclarationBlock;
+
+#ifdef DEBUG
+  // Flag to indicate that when we call StyleAnimationValue::ComputeValues on
+  // this value we should behave as if that function had failed.
+  bool mSimulateComputeValuesFailure = false;
+#endif
+
+  bool operator==(const PropertyValuePair&) const;
+};
+
+/**
+ * A single keyframe.
+ *
+ * This is the canonical form in which keyframe effects are stored and
+ * corresponds closely to the type of objects returned via the getKeyframes()
+ * API.
+ *
+ * Before computing an output animation value, however, we flatten these frames
+ * down to a series of per-property value arrays where we also resolve any
+ * overlapping shorthands/longhands, convert specified CSS values to computed
+ * values, etc.
+ *
+ * When the target element or computed style changes, however, we rebuild these
+ * per-property arrays from the original list of keyframes objects. As a result,
+ * these objects represent the master definition of the effect's values.
+ */
+struct Keyframe {
+  Keyframe() = default;
+  Keyframe(const Keyframe& aOther) = default;
+  Keyframe(Keyframe&& aOther) = default;
+
+  Keyframe& operator=(const Keyframe& aOther) = default;
+  Keyframe& operator=(Keyframe&& aOther) = default;
+
+  Maybe<double> mOffset;
+  static constexpr double kComputedOffsetNotSet = -1.0;
+  double mComputedOffset = kComputedOffsetNotSet;
+  Maybe<StyleComputedTimingFunction> mTimingFunction;  // Nothing() here means
+                                                       // "linear"
+  dom::CompositeOperationOrAuto mComposite =
+      dom::CompositeOperationOrAuto::Auto;
+  CopyableTArray<PropertyValuePair> mPropertyValues;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_dom_Keyframe_h