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diff --git a/layout/style/PseudoStyleType.h b/layout/style/PseudoStyleType.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_PseudoStyleType_h
+#define mozilla_PseudoStyleType_h
+
+#include <cstdint>
+#include <iosfwd>
+
+namespace mozilla {
+
+// The kind of pseudo-style that we have. This can be:
+//
+//  * CSS pseudo-elements (see nsCSSPseudoElements.h).
+//  * Anonymous boxes (see nsCSSAnonBoxes.h).
+//  * XUL tree pseudo-element stuff.
+//
+// This roughly corresponds to the `PseudoElement` enum in Rust code.
+enum class PseudoStyleType : uint8_t {
+// If CSS pseudo-elements stop being first here, change GetPseudoType.
+#define CSS_PSEUDO_ELEMENT(_name, _value, _flags) _name,
+#include "nsCSSPseudoElementList.h"
+#undef CSS_PSEUDO_ELEMENT
+  CSSPseudoElementsEnd,
+  AnonBoxesStart = CSSPseudoElementsEnd,
+  InheritingAnonBoxesStart = CSSPseudoElementsEnd,
+
+  // Dummy variant so the next variant also has the same discriminant as
+  // AnonBoxesStart.
+  __reset_1 = AnonBoxesStart - 1,
+
+#define CSS_ANON_BOX(_name, _str) _name,
+#define CSS_NON_INHERITING_ANON_BOX(_name, _str)
+#define CSS_WRAPPER_ANON_BOX(_name, _str)
+#include "nsCSSAnonBoxList.h"
+#undef CSS_ANON_BOX
+#undef CSS_WRAPPER_ANON_BOX
+#undef CSS_NON_INHERITING_ANON_BOX
+
+  // Wrapper anon boxes are inheriting anon boxes.
+  WrapperAnonBoxesStart,
+
+  // Dummy variant so the next variant also has the same discriminant as
+  // WrapperAnonBoxesStart.
+  __reset_2 = WrapperAnonBoxesStart - 1,
+
+#define CSS_ANON_BOX(_name, _str)
+#define CSS_NON_INHERITING_ANON_BOX(_name, _str)
+#define CSS_WRAPPER_ANON_BOX(_name, _str) _name,
+#include "nsCSSAnonBoxList.h"
+#undef CSS_ANON_BOX
+#undef CSS_WRAPPER_ANON_BOX
+#undef CSS_NON_INHERITING_ANON_BOX
+
+  WrapperAnonBoxesEnd,
+  InheritingAnonBoxesEnd = WrapperAnonBoxesEnd,
+  NonInheritingAnonBoxesStart = WrapperAnonBoxesEnd,
+
+  __reset_3 = NonInheritingAnonBoxesStart - 1,
+
+#define CSS_ANON_BOX(_name, _str)
+#define CSS_NON_INHERITING_ANON_BOX(_name, _str) _name,
+#include "nsCSSAnonBoxList.h"
+#undef CSS_ANON_BOX
+#undef CSS_NON_INHERITING_ANON_BOX
+
+  NonInheritingAnonBoxesEnd,
+  AnonBoxesEnd = NonInheritingAnonBoxesEnd,
+
+  XULTree = AnonBoxesEnd,
+  NotPseudo,
+  MAX
+};
+
+std::ostream& operator<<(std::ostream&, PseudoStyleType);
+
+class PseudoStyle final {
+ public:
+  using Type = PseudoStyleType;
+
+  // This must match EAGER_PSEUDO_COUNT in Rust code.
+  static const size_t kEagerPseudoCount = 4;
+
+  static bool IsPseudoElement(Type aType) {
+    return aType < Type::CSSPseudoElementsEnd;
+  }
+
+  static bool IsAnonBox(Type aType) {
+    return aType >= Type::AnonBoxesStart && aType < Type::AnonBoxesEnd;
+  }
+
+  static bool IsInheritingAnonBox(Type aType) {
+    return aType >= Type::InheritingAnonBoxesStart &&
+           aType < Type::InheritingAnonBoxesEnd;
+  }
+
+  static bool IsNonInheritingAnonBox(Type aType) {
+    return aType >= Type::NonInheritingAnonBoxesStart &&
+           aType < Type::NonInheritingAnonBoxesEnd;
+  }
+
+  static bool IsWrapperAnonBox(Type aType) {
+    return aType >= Type::WrapperAnonBoxesStart &&
+           aType < Type::WrapperAnonBoxesEnd;
+  }
+};
+
+}  // namespace mozilla
+
+#endif