diff --git a/editor/libeditor/HTMLEditSubActionHandler.cpp b/editor/libeditor/HTMLEditSubActionHandler.cpp
index 269bf9adbd06..76f19606e603 100644
--- a/editor/libeditor/HTMLEditSubActionHandler.cpp
+++ b/editor/libeditor/HTMLEditSubActionHandler.cpp
@@ -3051,14 +3051,11 @@ EditActionResult HTMLEditor::ChangeSelectedHardLinesToList(
             // MOZ_CAN_RUN_SCRIPT_BOUNDARY due to bug 1758868
             [&](Element& aListElement) MOZ_CAN_RUN_SCRIPT_BOUNDARY {
               Result<RefPtr<Element>, nsresult> listItemElementOrError =
-                  CreateAndInsertElement(
-                      aListElement.IsInComposedDoc() ? WithTransaction::Yes
-                                                     : WithTransaction::No,
-                      aListItemElementTagName,
-                      EditorDOMPoint(&aListElement, 0u),
-                      [](Element& aListItemElement) -> nsresult {
-                        return NS_OK;
-                      });
+                  CreateAndInsertElement(aListElement.IsInComposedDoc()
+                                             ? WithTransaction::Yes
+                                             : WithTransaction::No,
+                                         aListItemElementTagName,
+                                         EditorDOMPoint(&aListElement, 0u));
               if (listItemElementOrError.isErr()) {
                 NS_WARNING(nsPrintfCString(
                                "HTMLEditor::CreateAndInsertElement(%s) failed",
@@ -3227,8 +3224,7 @@ EditActionResult HTMLEditor::ChangeSelectedHardLinesToList(
           Result<RefPtr<Element>, nsresult> maybeNewListElement =
               CreateAndInsertElement(
                   WithTransaction::Yes, aListElementTagName,
-                  splitListItemParentResult.AtNextContent<EditorDOMPoint>(),
-                  [](Element& aListElement) -> nsresult { return NS_OK; });
+                  splitListItemParentResult.AtNextContent<EditorDOMPoint>());
           if (maybeNewListElement.isErr()) {
             NS_WARNING(
                 "HTMLEditor::CreateAndInsertElement(WithTransaction::Yes) "
@@ -3366,8 +3362,7 @@ EditActionResult HTMLEditor::ChangeSelectedHardLinesToList(
       prevListItem = nullptr;
       Result<RefPtr<Element>, nsresult> newListElementOrError =
           InsertElementWithSplittingAncestorsWithTransaction(
-              aListElementTagName, atContent, BRElementNextToSplitPoint::Keep,
-              [](Element& aListElement) -> nsresult { return NS_OK; });
+              aListElementTagName, atContent, BRElementNextToSplitPoint::Keep);
       if (MOZ_UNLIKELY(newListElementOrError.isErr())) {
         NS_WARNING(
             nsPrintfCString(
@@ -3689,8 +3684,7 @@ nsresult HTMLEditor::FormatBlockContainerWithTransaction(nsAtom& blockType) {
     // Make sure we can put a block here.
     Result<RefPtr<Element>, nsresult> newBlockElementOrError =
         InsertElementWithSplittingAncestorsWithTransaction(
-            blockType, pointToInsertBlock, BRElementNextToSplitPoint::Keep,
-            [](Element& aBlockElement) -> nsresult { return NS_OK; });
+            blockType, pointToInsertBlock, BRElementNextToSplitPoint::Keep);
     if (MOZ_UNLIKELY(newBlockElementOrError.isErr())) {
       NS_WARNING(
           nsPrintfCString(
@@ -3895,8 +3889,7 @@ nsresult HTMLEditor::IndentListChild(RefPtr<Element>* aCurList,
     Result<RefPtr<Element>, nsresult> newListElementOrError =
         InsertElementWithSplittingAncestorsWithTransaction(
             MOZ_KnownLive(*containerName), aCurPoint,
-            BRElementNextToSplitPoint::Keep,
-            [](Element& aListElement) -> nsresult { return NS_OK; });
+            BRElementNextToSplitPoint::Keep);
     if (MOZ_UNLIKELY(newListElementOrError.isErr())) {
       NS_WARNING(
           nsPrintfCString(
@@ -4058,8 +4051,7 @@ nsresult HTMLEditor::HandleCSSIndentAtSelectionInternal() {
     Result<RefPtr<Element>, nsresult> newDivElementOrError =
         InsertElementWithSplittingAncestorsWithTransaction(
             *nsGkAtoms::div, atStartOfSelection,
-            BRElementNextToSplitPoint::Keep,
-            [](Element& aDivElement) -> nsresult { return NS_OK; });
+            BRElementNextToSplitPoint::Keep);
     if (MOZ_UNLIKELY(newDivElementOrError.isErr())) {
       NS_WARNING(
           "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
@@ -4155,8 +4147,7 @@ nsresult HTMLEditor::HandleCSSIndentAtSelectionInternal() {
 
       Result<RefPtr<Element>, nsresult> newDivElementOrError =
           InsertElementWithSplittingAncestorsWithTransaction(
-              *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep,
-              [](Element& aDivElement) -> nsresult { return NS_OK; });
+              *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep);
       if (MOZ_UNLIKELY(newDivElementOrError.isErr())) {
         NS_WARNING(
             "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
@@ -4267,8 +4258,7 @@ nsresult HTMLEditor::HandleHTMLIndentAtSelectionInternal() {
     Result<RefPtr<Element>, nsresult> newBlockQuoteElementOrError =
         InsertElementWithSplittingAncestorsWithTransaction(
             *nsGkAtoms::blockquote, atStartOfSelection,
-            BRElementNextToSplitPoint::Keep,
-            [](Element& aBlockquoteElement) -> nsresult { return NS_OK; });
+            BRElementNextToSplitPoint::Keep);
     if (MOZ_UNLIKELY(newBlockQuoteElementOrError.isErr())) {
       NS_WARNING(
           "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
@@ -4372,8 +4362,7 @@ nsresult HTMLEditor::HandleHTMLIndentAtSelectionInternal() {
         Result<RefPtr<Element>, nsresult> newListElementOrError =
             InsertElementWithSplittingAncestorsWithTransaction(
                 MOZ_KnownLive(*containerName), atListItem,
-                BRElementNextToSplitPoint::Keep,
-                [](Element& aListElement) -> nsresult { return NS_OK; });
+                BRElementNextToSplitPoint::Keep);
         if (MOZ_UNLIKELY(newListElementOrError.isErr())) {
           NS_WARNING(nsPrintfCString("HTMLEditor::"
                                      "InsertElementWithSplittingAncestorsWithTr"
@@ -4421,8 +4410,7 @@ nsresult HTMLEditor::HandleHTMLIndentAtSelectionInternal() {
       Result<RefPtr<Element>, nsresult> newBlockQuoteElementOrError =
           InsertElementWithSplittingAncestorsWithTransaction(
               *nsGkAtoms::blockquote, atContent,
-              BRElementNextToSplitPoint::Keep,
-              [](Element& aBlockquoteElement) -> nsresult { return NS_OK; });
+              BRElementNextToSplitPoint::Keep);
       if (MOZ_UNLIKELY(newBlockQuoteElementOrError.isErr())) {
         NS_WARNING(
             "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
@@ -5426,8 +5414,7 @@ EditActionResult HTMLEditor::AlignContentsAtSelectionWithEmptyDivElement(
   Result<RefPtr<Element>, nsresult> newDivElementOrError =
       InsertElementWithSplittingAncestorsWithTransaction(
           *nsGkAtoms::div, atStartOfSelection,
-          BRElementNextToSplitPoint::Delete,
-          [](Element& aDivElement) -> nsresult { return NS_OK; });
+          BRElementNextToSplitPoint::Delete);
   if (newDivElementOrError.isErr()) {
     NS_WARNING(
         "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
@@ -5603,8 +5590,7 @@ nsresult HTMLEditor::AlignNodesAndDescendants(
 
       Result<RefPtr<Element>, nsresult> newDivElementOrError =
           InsertElementWithSplittingAncestorsWithTransaction(
-              *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep,
-              [](Element& aDivElement) -> nsresult { return NS_OK; });
+              *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep);
       if (MOZ_UNLIKELY(newDivElementOrError.isErr())) {
         NS_WARNING(
             "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
@@ -7502,8 +7488,8 @@ nsresult HTMLEditor::HandleInsertParagraphInListItemElement(
           Result<RefPtr<Element>, nsresult> maybeNewListItemElement =
               CreateAndInsertElement(
                   WithTransaction::Yes,
-                  MOZ_KnownLive(*nextDefinitionListItemTagName), atNextListItem,
-                  [](Element& aListItemElement) -> nsresult { return NS_OK; });
+                  MOZ_KnownLive(*nextDefinitionListItemTagName),
+                  atNextListItem);
           if (maybeNewListItemElement.isErr()) {
             NS_WARNING(
                 "HTMLEditor::CreateAndInsertElement(WithTransaction::Yes) "
@@ -7634,8 +7620,7 @@ nsresult HTMLEditor::MoveNodesIntoNewBlockquoteElement(
       Result<RefPtr<Element>, nsresult> newBlockQuoteElementOrError =
           InsertElementWithSplittingAncestorsWithTransaction(
               *nsGkAtoms::blockquote, EditorDOMPoint(content),
-              BRElementNextToSplitPoint::Keep,
-              [](Element& aBlockquoteElement) -> nsresult { return NS_OK; });
+              BRElementNextToSplitPoint::Keep);
       if (MOZ_UNLIKELY(newBlockQuoteElementOrError.isErr())) {
         NS_WARNING(
             "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
@@ -7885,8 +7870,7 @@ nsresult HTMLEditor::CreateOrChangeBlockContainerElement(
       // Make sure we can put a block here
       Result<RefPtr<Element>, nsresult> newBlockElementOrError =
           InsertElementWithSplittingAncestorsWithTransaction(
-              aBlockTag, atContent, BRElementNextToSplitPoint::Keep,
-              [](Element& aBlockElement) -> nsresult { return NS_OK; });
+              aBlockTag, atContent, BRElementNextToSplitPoint::Keep);
       if (MOZ_UNLIKELY(newBlockElementOrError.isErr())) {
         NS_WARNING(
             nsPrintfCString(
@@ -7926,8 +7910,7 @@ nsresult HTMLEditor::CreateOrChangeBlockContainerElement(
       // block for it.
       Result<RefPtr<Element>, nsresult> newBlockElementOrError =
           InsertElementWithSplittingAncestorsWithTransaction(
-              aBlockTag, atContent, BRElementNextToSplitPoint::Keep,
-              [](Element& aBlockElement) -> nsresult { return NS_OK; });
+              aBlockTag, atContent, BRElementNextToSplitPoint::Keep);
       if (MOZ_UNLIKELY(newBlockElementOrError.isErr())) {
         NS_WARNING(
             nsPrintfCString(
@@ -7975,8 +7958,7 @@ nsresult HTMLEditor::CreateOrChangeBlockContainerElement(
       if (!curBlock) {
         Result<RefPtr<Element>, nsresult> newBlockElementOrError =
             InsertElementWithSplittingAncestorsWithTransaction(
-                aBlockTag, atContent, BRElementNextToSplitPoint::Keep,
-                [](Element& aBlockElement) -> nsresult { return NS_OK; });
+                aBlockTag, atContent, BRElementNextToSplitPoint::Keep);
         if (MOZ_UNLIKELY(newBlockElementOrError.isErr())) {
           NS_WARNING(nsPrintfCString("HTMLEditor::"
                                      "InsertElementWithSplittingAncestorsWithTr"
@@ -9741,8 +9723,7 @@ nsresult HTMLEditor::MoveSelectedContentsToDivElementToMakeItAbsolutePosition(
     // Make sure we can put a block here.
     Result<RefPtr<Element>, nsresult> newDivElementOrError =
         InsertElementWithSplittingAncestorsWithTransaction(
-            *nsGkAtoms::div, atCaret, BRElementNextToSplitPoint::Keep,
-            [](Element& aDivElement) -> nsresult { return NS_OK; });
+            *nsGkAtoms::div, atCaret, BRElementNextToSplitPoint::Keep);
     if (MOZ_UNLIKELY(newDivElementOrError.isErr())) {
       NS_WARNING(
           "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
@@ -9833,8 +9814,7 @@ nsresult HTMLEditor::MoveSelectedContentsToDivElementToMakeItAbsolutePosition(
           // element with splitting the ancestors.
           Result<RefPtr<Element>, nsresult> newDivElementOrError =
               InsertElementWithSplittingAncestorsWithTransaction(
-                  *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep,
-                  [](Element& aDivElement) -> nsresult { return NS_OK; });
+                  *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep);
           if (MOZ_UNLIKELY(newDivElementOrError.isErr())) {
             NS_WARNING(
                 "HTMLEditor::"
@@ -9846,10 +9826,9 @@ nsresult HTMLEditor::MoveSelectedContentsToDivElementToMakeItAbsolutePosition(
           targetDivElement = newDivElementOrError.unwrap();
         }
         Result<RefPtr<Element>, nsresult> maybeNewListElement =
-            CreateAndInsertElement(
-                WithTransaction::Yes, MOZ_KnownLive(*ULOrOLOrDLTagName),
-                EditorDOMPoint::AtEndOf(targetDivElement),
-                [](Element& aListElement) -> nsresult { return NS_OK; });
+            CreateAndInsertElement(WithTransaction::Yes,
+                                   MOZ_KnownLive(*ULOrOLOrDLTagName),
+                                   EditorDOMPoint::AtEndOf(targetDivElement));
         if (maybeNewListElement.isErr()) {
           NS_WARNING(
               "HTMLEditor::CreateAndInsertElement(WithTransaction::Yes) "
@@ -9916,8 +9895,7 @@ nsresult HTMLEditor::MoveSelectedContentsToDivElementToMakeItAbsolutePosition(
           // element with splitting the ancestors.
           Result<RefPtr<Element>, nsresult> newDivElementOrError =
               InsertElementWithSplittingAncestorsWithTransaction(
-                  *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep,
-                  [](Element& aDivElement) -> nsresult { return NS_OK; });
+                  *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep);
           if (MOZ_UNLIKELY(newDivElementOrError.isErr())) {
             NS_WARNING(
                 "HTMLEditor::"
@@ -9930,10 +9908,9 @@ nsresult HTMLEditor::MoveSelectedContentsToDivElementToMakeItAbsolutePosition(
         }
         // XXX So, createdListElement may be set to a non-list element.
         Result<RefPtr<Element>, nsresult> maybeNewListElement =
-            CreateAndInsertElement(
-                WithTransaction::Yes, MOZ_KnownLive(*containerName),
-                EditorDOMPoint::AtEndOf(targetDivElement),
-                [](Element& aListElement) -> nsresult { return NS_OK; });
+            CreateAndInsertElement(WithTransaction::Yes,
+                                   MOZ_KnownLive(*containerName),
+                                   EditorDOMPoint::AtEndOf(targetDivElement));
         if (maybeNewListElement.isErr()) {
           NS_WARNING(
               "HTMLEditor::CreateAndInsertElement(WithTransaction::Yes) "
@@ -9975,8 +9952,7 @@ nsresult HTMLEditor::MoveSelectedContentsToDivElementToMakeItAbsolutePosition(
       // and to contain all selected nodes.
       Result<RefPtr<Element>, nsresult> newDivElementOrError =
           InsertElementWithSplittingAncestorsWithTransaction(
-              *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep,
-              [](Element& aDivElement) -> nsresult { return NS_OK; });
+              *nsGkAtoms::div, atContent, BRElementNextToSplitPoint::Keep);
       if (newDivElementOrError.isErr()) {
         NS_WARNING(
             "HTMLEditor::InsertElementWithSplittingAncestorsWithTransaction("
diff --git a/editor/libeditor/HTMLEditor.cpp b/editor/libeditor/HTMLEditor.cpp
index 5f88d473cc69..8508b355f83b 100644
--- a/editor/libeditor/HTMLEditor.cpp
+++ b/editor/libeditor/HTMLEditor.cpp
@@ -3668,8 +3668,7 @@ Result<RefPtr<Element>, nsresult> HTMLEditor::InsertBRElement(
   MOZ_ASSERT(maybePointToInsert.inspect().IsSetAndValid());
 
   Result<RefPtr<Element>, nsresult> maybeNewBRElement = CreateAndInsertElement(
-      aWithTransaction, *nsGkAtoms::br, maybePointToInsert.inspect(),
-      [](Element& aBRElement) -> nsresult { return NS_OK; });
+      aWithTransaction, *nsGkAtoms::br, maybePointToInsert.inspect());
   if (maybeNewBRElement.isErr()) {
     NS_WARNING(nsPrintfCString("HTMLEditor::CreateAndInsertElement(%s) failed",
                                ToString(aWithTransaction).c_str())
diff --git a/editor/libeditor/HTMLEditor.h b/editor/libeditor/HTMLEditor.h
index a09c6963ad3f..080f9c42f256 100644
--- a/editor/libeditor/HTMLEditor.h
+++ b/editor/libeditor/HTMLEditor.h
@@ -1505,9 +1505,12 @@ class HTMLEditor final : public EditorBase,
    * @return                    The created new element node or an error.
    */
   [[nodiscard]] MOZ_CAN_RUN_SCRIPT Result<RefPtr<Element>, nsresult>
-  CreateAndInsertElement(WithTransaction aWithTransaction, nsAtom& aTagName,
-                         const EditorDOMPoint& aPointToInsert,
-                         const std::function<nsresult(Element&)>& aInitializer);
+  CreateAndInsertElement(
+      WithTransaction aWithTransaction, nsAtom& aTagName,
+      const EditorDOMPoint& aPointToInsert,
+      const std::function<nsresult(Element&)>& aInitializer = [](Element&) {
+        return NS_OK;
+      });
 
   /**
    * MaybeSplitAncestorsForInsertWithTransaction() does nothing if container of
@@ -1555,7 +1558,9 @@ class HTMLEditor final : public EditorBase,
   InsertElementWithSplittingAncestorsWithTransaction(
       nsAtom& aTagName, const EditorDOMPoint& aPointToInsert,
       BRElementNextToSplitPoint aBRElementNextToSplitPoint,
-      const std::function<nsresult(Element&)>& aInitializer);
+      const std::function<nsresult(Element&)>& aInitializer = [](Element&) {
+        return NS_OK;
+      });
 
   /**
    * SplitRangeOffFromBlock() splits aBlockElement at two points, before
@@ -3435,7 +3440,8 @@ class HTMLEditor final : public EditorBase,
    */
   MOZ_CAN_RUN_SCRIPT Result<RefPtr<Element>, nsresult>
   DeleteSelectionAndCreateElement(
-      nsAtom& aTag, const std::function<nsresult(Element&)>& aInitializer);
+      nsAtom& aTag, const std::function<nsresult(Element&)>& aInitializer =
+                        [](Element&) { return NS_OK; });
 
   /**
    * This method first deletes the selection, if it's not collapsed.  Then if