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diff --git a/editor/libeditor/DeleteRangeTransaction.h b/editor/libeditor/DeleteRangeTransaction.h
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+++ b/editor/libeditor/DeleteRangeTransaction.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 DeleteRangeTransaction_h
+#define DeleteRangeTransaction_h
+
+#include "EditAggregateTransaction.h"
+
+#include "EditorBase.h"
+#include "EditorForwards.h"
+
+#include "mozilla/RefPtr.h"
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsID.h"
+#include "nsIEditor.h"
+#include "nsISupportsImpl.h"
+#include "nsRange.h"
+#include "nscore.h"
+
+class nsINode;
+
+namespace mozilla {
+
+/**
+ * A transaction that deletes an entire range in the content tree
+ */
+class DeleteRangeTransaction final : public EditAggregateTransaction {
+ protected:
+  DeleteRangeTransaction(EditorBase& aEditorBase,
+                         const nsRange& aRangeToDelete);
+
+ public:
+  /**
+   * Creates a delete range transaction.  This never returns nullptr.
+   *
+   * @param aEditorBase         The object providing basic editing operations.
+   * @param aRangeToDelete      The range to delete.
+   */
+  static already_AddRefed<DeleteRangeTransaction> Create(
+      EditorBase& aEditorBase, const nsRange& aRangeToDelete) {
+    RefPtr<DeleteRangeTransaction> transaction =
+        new DeleteRangeTransaction(aEditorBase, aRangeToDelete);
+    return transaction.forget();
+  }
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DeleteRangeTransaction,
+                                           EditAggregateTransaction)
+  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override;
+
+  NS_DECL_EDITTRANSACTIONBASE
+  NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(DeleteRangeTransaction)
+
+  MOZ_CAN_RUN_SCRIPT NS_IMETHOD RedoTransaction() override;
+
+ protected:
+  /**
+   * Extend the range by adding a surrounding whitespace character to the range
+   * that is about to be deleted. This method depends on the pref
+   * `layout.word_select.delete_space_after_doubleclick_selection`.
+   *
+   * Considered cases:
+   *   "one [two] three" -> "one [two ]three" -> "one three"
+   *   "[one] two" -> "[one ]two" -> "two"
+   *   "one [two]" -> "one[ two]" -> "one"
+   *   "one [two], three" -> "one[ two], three" -> "one, three"
+   *   "one  [two]" -> "one [ two]" -> "one "
+   *
+   * @param aRange  [inout] The range that is about to be deleted.
+   * @return                NS_OK, unless nsRange::SetStart / ::SetEnd fails.
+   */
+  nsresult MaybeExtendDeletingRangeWithSurroundingWhitespace(
+      nsRange& aRange) const;
+
+  /**
+   * AppendTransactionsToDeleteIn() creates a DeleteTextTransaction or some
+   * DeleteNodeTransactions to remove text or nodes between aStart and aEnd
+   * and appends the created transactions to the array.
+   *
+   * @param aRangeToDelete      Must be positioned, valid and in same container.
+   * @return            Returns NS_OK in most cases.
+   *                    When the arguments are invalid, returns
+   *                    NS_ERROR_INVALID_ARG.
+   *                    When mEditorBase isn't available, returns
+   *                    NS_ERROR_NOT_AVAILABLE.
+   *                    When created DeleteTextTransaction cannot do its
+   *                    transaction, returns NS_ERROR_FAILURE.
+   *                    Note that even if one of created DeleteNodeTransaction
+   *                    cannot do its transaction, this returns NS_OK.
+   */
+  nsresult AppendTransactionsToDeleteIn(
+      const EditorRawDOMRange& aRangeToDelete);
+
+  /**
+   * AppendTransactionsToDeleteNodesWhoseEndBoundaryIn() creates
+   * DeleteNodeTransaction instances to remove nodes whose end is in the range
+   * (in other words, its end tag is in the range if it's an element) and append
+   * them to the array.
+   *
+   * @param aRangeToDelete      Must be positioned and valid.
+   */
+  nsresult AppendTransactionsToDeleteNodesWhoseEndBoundaryIn(
+      const EditorRawDOMRange& aRangeToDelete);
+
+  /**
+   * AppendTransactionToDeleteText() creates a DeleteTextTransaction to delete
+   * text between start of aPoint.GetContainer() and aPoint or aPoint and end of
+   * aPoint.GetContainer() and appends the created transaction to the array.
+   *
+   * @param aMaybePointInText   Must be set and valid.  If the point is not
+   *                            in a text node, this method does nothing.
+   * @param aAction     If nsIEditor::eNext, this method creates a transaction
+   *                    to delete text from aPoint to the end of the data node.
+   *                    Otherwise, this method creates a transaction to delete
+   *                    text from start of the data node to aPoint.
+   * @return            Returns NS_OK in most cases.
+   *                    When the arguments are invalid, returns
+   *                    NS_ERROR_INVALID_ARG.
+   *                    When mEditorBase isn't available, returns
+   *                    NS_ERROR_NOT_AVAILABLE.
+   *                    When created DeleteTextTransaction cannot do its
+   *                    transaction, returns NS_ERROR_FAILURE.
+   *                    Note that even if no character will be deleted,
+   *                    this returns NS_OK.
+   */
+  nsresult AppendTransactionToDeleteText(
+      const EditorRawDOMPoint& aMaybePointInText,
+      nsIEditor::EDirection aAction);
+
+  // The editor for this transaction.
+  RefPtr<EditorBase> mEditorBase;
+
+  // P1 in the range.  This is only non-null until DoTransaction is called and
+  // we convert it into child transactions.
+  RefPtr<nsRange> mRangeToDelete;
+};
+
+}  // namespace mozilla
+
+#endif  // #ifndef DeleteRangeTransaction_h