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diff --git a/editor/libeditor/SplitNodeTransaction.h b/editor/libeditor/SplitNodeTransaction.h
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+++ b/editor/libeditor/SplitNodeTransaction.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 SplitNodeTransaction_h
+#define SplitNodeTransaction_h
+
+#include "EditorForwards.h"
+#include "EditTransactionBase.h"  // for EditorTransactionBase
+
+#include "nsCOMPtr.h"  // for nsCOMPtr
+#include "nsCycleCollectionParticipant.h"
+#include "nsIContent.h"
+#include "nsISupportsImpl.h"  // for NS_DECL_ISUPPORTS_INHERITED
+#include "nscore.h"           // for NS_IMETHOD
+
+namespace mozilla {
+
+/**
+ * A transaction that splits a node into two identical nodes, with the children
+ * divided between the new nodes.
+ */
+class SplitNodeTransaction final : public EditTransactionBase {
+ private:
+  template <typename PT, typename CT>
+  SplitNodeTransaction(HTMLEditor& aHTMLEditor,
+                       const EditorDOMPointBase<PT, CT>& aStartOfRightContent);
+
+ public:
+  /**
+   * Creates a transaction to create a new node identical to an existing node,
+   * and split the contents between the same point in both nodes.
+   *
+   * @param aHTMLEditor             The provider of core editing operations.
+   * @param aStartOfRightContent    The point to split.  Its container will be
+   *                                split, and its preceding or following
+   *                                content will be moved to the new node.  And
+   *                                the point will be start of the right node or
+   *                                end of the left node.
+   */
+  template <typename PT, typename CT>
+  static already_AddRefed<SplitNodeTransaction> Create(
+      HTMLEditor& aHTMLEditor,
+      const EditorDOMPointBase<PT, CT>& aStartOfRightContent);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SplitNodeTransaction,
+                                           EditTransactionBase)
+
+  NS_DECL_EDITTRANSACTIONBASE
+  NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(SplitNodeTransaction)
+
+  MOZ_CAN_RUN_SCRIPT NS_IMETHOD RedoTransaction() override;
+
+  // Note that we don't support join/split node direction switching per
+  // transaction.
+  [[nodiscard]] SplitNodeDirection GetSplitNodeDirection() const;
+  [[nodiscard]] JoinNodesDirection GetJoinNodesDirection() const;
+
+  nsIContent* GetSplitContent() const { return mSplitContent; }
+  nsIContent* GetNewContent() const { return mNewContent; }
+  nsINode* GetParentNode() const { return mParentNode; }
+
+  // The split offset.  At undoing, this is recomputed with tracking the
+  // first child of mSplitContent.
+  uint32_t SplitOffset() const { return mSplitOffset; }
+
+  friend std::ostream& operator<<(std::ostream& aStream,
+                                  const SplitNodeTransaction& aTransaction);
+
+ protected:
+  virtual ~SplitNodeTransaction() = default;
+
+  MOZ_CAN_RUN_SCRIPT Result<SplitNodeResult, nsresult> DoTransactionInternal(
+      HTMLEditor& aHTMLEditor, nsIContent& aSplittingContent,
+      nsIContent& aNewContent, uint32_t aSplitOffset);
+
+  RefPtr<HTMLEditor> mHTMLEditor;
+
+  // The node which should be parent of both mNewContent and mSplitContent.
+  nsCOMPtr<nsINode> mParentNode;
+
+  // The node we create when splitting mSplitContent.
+  nsCOMPtr<nsIContent> mNewContent;
+
+  // The content node which we split.
+  nsCOMPtr<nsIContent> mSplitContent;
+
+  // The offset where we split in mSplitContent.  This is required for doing and
+  // redoing.  Therefore, this is updated when undoing.
+  uint32_t mSplitOffset;
+};
+
+}  // namespace mozilla
+
+#endif  // #ifndef SplitNodeTransaction_h