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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/. */
+
+/* values to identify particular subtrees of native anonymous content */
+
+#ifndef mozilla_AnonymousContentKey_h
+#define mozilla_AnonymousContentKey_h
+
+#include "mozilla/TypedEnumBits.h"
+#include <stdint.h>
+#include "X11UndefineNone.h"
+
+namespace mozilla {
+
+// clang-format off
+
+// We currently use cached anonymous content styles only for scrollbar parts,
+// and we can fit the type of scrollbar part element along with its different
+// options (such as orientation, and other attribute values that can affect
+// styling) into a uint8_t.
+//
+// The lower three bits hold a Type_* value identifying the type of
+// element, and the remaining bits store Flag_* values.
+//
+// A value of 0 is used to represent an anonymous content subtree that we don't
+// cache styles for.
+enum class AnonymousContentKey : uint8_t {
+ None = 0x00,
+
+ // all
+ Type_ScrollCorner = 0x01,
+ Type_Scrollbar = 0x02,
+ Type_ScrollbarButton = 0x03,
+ Type_Slider = 0x04,
+
+ // scrollbar, scrollbarbutton, slider
+ Flag_Vertical = 0x08,
+
+ // scrollbarbutton
+ Flag_ScrollbarButton_Down = 0x10,
+ Flag_ScrollbarButton_Bottom = 0x20,
+ Flag_ScrollbarButton_Decrement = 0x40,
+};
+
+// clang-format on
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(AnonymousContentKey)
+
+} // namespace mozilla
+
+#endif // mozilla_AnonymousContentKey_h