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diff --git a/dom/base/GeneratedImageContent.h b/dom/base/GeneratedImageContent.h
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+++ b/dom/base/GeneratedImageContent.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 dom_base_GeneratedImageContent_h
+#define dom_base_GeneratedImageContent_h
+
+/* A content node that keeps track of an index in the parent's `content`
+ * property value, used for url() values in the content of a ::before or ::after
+ * pseudo-element. */
+
+#include "mozilla/dom/HTMLElementBinding.h"
+#include "mozilla/dom/NameSpaceConstants.h"
+#include "mozilla/dom/NodeInfo.h"
+#include "nsGenericHTMLElement.h"
+
+namespace mozilla::dom {
+
+class GeneratedImageContent final : public nsGenericHTMLElement {
+ public:
+  static already_AddRefed<GeneratedImageContent> Create(Document&,
+                                                        uint32_t aContentIndex);
+  // An image created from 'list-style-image' for a ::marker pseudo.
+  static already_AddRefed<GeneratedImageContent> CreateForListStyleImage(
+      Document&);
+
+  explicit GeneratedImageContent(already_AddRefed<dom::NodeInfo>&& aNodeInfo)
+      : nsGenericHTMLElement(std::move(aNodeInfo)) {
+    MOZ_ASSERT(IsInNamespace(kNameSpaceID_XHTML),
+               "Someone messed up our nodeinfo");
+  }
+
+  ElementState IntrinsicState() const override {
+    ElementState state = nsGenericHTMLElement::IntrinsicState();
+    if (mBroken) {
+      state |= ElementState::BROKEN;
+    }
+    return state;
+  }
+  nsresult Clone(dom::NodeInfo* aNodeInfo, nsINode** aResult) const final;
+
+  nsresult CopyInnerTo(GeneratedImageContent* aDest) {
+    nsresult rv = nsGenericHTMLElement::CopyInnerTo(aDest);
+    NS_ENSURE_SUCCESS(rv, rv);
+    aDest->mIndex = mIndex;
+    return NS_OK;
+  }
+
+  // Is this an image created from 'list-style-image'?
+  bool IsForListStyleImageMarker() const { return Index() == uint32_t(-1); }
+
+  // @note we use -1 for images created from 'list-style-image'
+  uint32_t Index() const { return mIndex; }
+
+  // Notify this image failed to load.
+  void NotifyLoadFailed() {
+    mBroken = true;
+    UpdateState(true);
+  }
+
+ protected:
+  JSObject* WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
+
+ private:
+  virtual ~GeneratedImageContent() = default;
+  uint32_t mIndex = 0;
+  bool mBroken = false;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // dom_base_GeneratedImageContent_h