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diff --git a/layout/style/CSSPropFlags.h b/layout/style/CSSPropFlags.h
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+++ b/layout/style/CSSPropFlags.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_CSSPropFlags_h
+#define mozilla_CSSPropFlags_h
+
+#include "mozilla/TypedEnumBits.h"
+
+namespace mozilla {
+
+enum class CSSPropFlags : uint8_t {
+  // This property is not parsed. It is only there for internal use like
+  // attribute mapping.
+  Inaccessible = 1 << 0,
+
+  // The following two flags along with the pref defines where the this
+  // property can be used:
+  // * If none of the two flags is presented, the pref completely controls
+  //   the availability of this property. And in that case, if it has no
+  //   pref, this property is usable everywhere.
+  // * If any of the flags is set, this property is always enabled in the
+  //   specific contexts regardless of the value of the pref. If there is
+  //   no pref for this property at all in this case, it is an internal-
+  //   only property, which cannot be used anywhere else, and should be
+  //   wrapped in "#ifndef CSS_PROP_LIST_EXCLUDE_INTERNAL".
+  // Note that, these flags have no effect on the use of aliases of this
+  // property.
+  // Furthermore, for the purposes of animation (including triggering
+  // transitions) these flags are ignored. That is, if the property is disabled
+  // by a pref, we will *not* run animations or transitions on it even in
+  // UA sheets or chrome.
+  EnabledInUASheets = 1 << 1,
+  EnabledInChrome = 1 << 2,
+  EnabledInUASheetsAndChrome = EnabledInUASheets | EnabledInChrome,
+  EnabledMask = EnabledInUASheetsAndChrome,
+
+  // This property can be animated on the compositor.
+  CanAnimateOnCompositor = 1 << 3,
+
+  // This property is an internal property that is not represented in
+  // the DOM. Properties with this flag are defined in an #ifndef
+  // CSS_PROP_LIST_EXCLUDE_INTERNAL section.
+  Internal = 1 << 4,
+
+  // Whether this property should be serialized by Servo in getComputedStyle.
+  SerializedByServo = 1 << 5,
+
+  // Whether this is a logical property.
+  IsLogical = 1 << 6,
+
+  // Whether this shorthand property is unconditionally exposed in
+  // getComputedStyle.
+  ShorthandUnconditionallyExposedOnGetCS = 1 << 7,
+};
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(CSSPropFlags)
+
+}  // namespace mozilla
+
+#endif  // mozilla_CSSPropFlags_h