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diff --git a/dom/animation/CSSPseudoElement.h b/dom/animation/CSSPseudoElement.h
new file mode 100644
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+++ b/dom/animation/CSSPseudoElement.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_CSSPseudoElement_h
+#define mozilla_dom_CSSPseudoElement_h
+
+#include "js/TypeDecls.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/RefPtr.h"
+#include "nsCSSPseudoElements.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla::dom {
+
+class Animation;
+class Element;
+class UnrestrictedDoubleOrKeyframeAnimationOptions;
+
+class CSSPseudoElement final : public nsWrapperCache {
+ public:
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(CSSPseudoElement)
+  NS_DECL_CYCLE_COLLECTION_NATIVE_WRAPPERCACHE_CLASS(CSSPseudoElement)
+
+ protected:
+  virtual ~CSSPseudoElement();
+
+ public:
+  ParentObject GetParentObject() const;
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  PseudoStyleType GetType() const { return mPseudoType; }
+  void GetType(nsString& aRetVal) const {
+    MOZ_ASSERT(nsCSSPseudoElements::GetPseudoAtom(mPseudoType),
+               "All pseudo-types allowed by this class should have a"
+               " corresponding atom");
+    // Our atoms use one colon and we would like to return two colons syntax
+    // for the returned pseudo type string, so serialize this to the
+    // non-deprecated two colon syntax.
+    aRetVal.Assign(char16_t(':'));
+    aRetVal.Append(
+        nsDependentAtomString(nsCSSPseudoElements::GetPseudoAtom(mPseudoType)));
+  }
+  dom::Element* Element() const { return mOriginatingElement.get(); }
+
+  // Given an element:pseudoType pair, returns the CSSPseudoElement stored as a
+  // property on |aElement|. If there is no CSSPseudoElement for the specified
+  // pseudo-type on element, a new CSSPseudoElement will be created and stored
+  // on the element.
+  static already_AddRefed<CSSPseudoElement> GetCSSPseudoElement(
+      dom::Element* aElement, PseudoStyleType aType);
+
+ private:
+  // Only ::before, ::after and ::marker are supported.
+  CSSPseudoElement(dom::Element* aElement, PseudoStyleType aType);
+
+  static nsAtom* GetCSSPseudoElementPropertyAtom(PseudoStyleType aType);
+
+  // mOriginatingElement needs to be an owning reference since if script is
+  // holding on to the pseudo-element, it needs to continue to be able to refer
+  // to the originating element.
+  RefPtr<dom::Element> mOriginatingElement;
+  PseudoStyleType mPseudoType;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_CSSPseudoElement_h