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diff --git a/editor/libeditor/CreateElementTransaction.h b/editor/libeditor/CreateElementTransaction.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 CreateElementTransaction_h
+#define CreateElementTransaction_h
+
+#include "mozilla/EditTransactionBase.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsISupportsImpl.h"
+
+class nsIAtom;
+class nsIContent;
+class nsINode;
+
+/**
+ * A transaction that creates a new node in the content tree.
+ */
+namespace mozilla {
+
+class EditorBase;
+namespace dom {
+class Element;
+} // namespace dom
+
+class CreateElementTransaction final : public EditTransactionBase
+{
+public:
+ /**
+ * Initialize the transaction.
+ * @param aEditorBase The provider of basic editing functionality.
+ * @param aTag The tag (P, HR, TABLE, etc.) for the new element.
+ * @param aParent The node into which the new element will be
+ * inserted.
+ * @param aOffsetInParent The location in aParent to insert the new element.
+ * If eAppend, the new element is appended as the last
+ * child.
+ */
+ CreateElementTransaction(EditorBase& aEditorBase,
+ nsIAtom& aTag,
+ nsINode& aParent,
+ int32_t aOffsetInParent);
+
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(CreateElementTransaction,
+ EditTransactionBase)
+
+ NS_DECL_EDITTRANSACTIONBASE
+
+ NS_IMETHOD RedoTransaction() override;
+
+ already_AddRefed<dom::Element> GetNewNode();
+
+protected:
+ virtual ~CreateElementTransaction();
+
+ // The document into which the new node will be inserted.
+ EditorBase* mEditorBase;
+
+ // The tag (mapping to object type) for the new element.
+ nsCOMPtr<nsIAtom> mTag;
+
+ // The node into which the new node will be inserted.
+ nsCOMPtr<nsINode> mParent;
+
+ // The index in mParent for the new node.
+ int32_t mOffsetInParent;
+
+ // The new node to insert.
+ nsCOMPtr<dom::Element> mNewNode;
+
+ // The node we will insert mNewNode before. We compute this ourselves.
+ nsCOMPtr<nsIContent> mRefNode;
+};
+
+} // namespace mozilla
+
+#endif // #ifndef CreateElementTransaction_h