List marker pseudo elements.

Source/core/layout/LayoutObjectChildList.cpp

Index: Source/core/layout/LayoutObjectChildList.cpp
diff --git a/Source/core/layout/LayoutObjectChildList.cpp b/Source/core/layout/LayoutObjectChildList.cpp
index bcccbc081c0f36bbca307764c7ef40b7d8fcc7f2..6bd46f3c096e8e467be1ff853105527b62196d2a 100644
--- a/Source/core/layout/LayoutObjectChildList.cpp
+++ b/Source/core/layout/LayoutObjectChildList.cpp
@@ -28,6 +28,7 @@
 #include "core/layout/LayoutObjectChildList.h"
 
 #include "core/dom/AXObjectCache.h"
+#include "core/dom/MarkerPseudoElement.h"
 #include "core/layout/LayoutCounter.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutView.h"
@@ -39,6 +40,9 @@ namespace blink {
 void LayoutObjectChildList::destroyLeftoverChildren()
 {
     while (firstChild()) {
+        // RuntimeEnabledFeatures::listMarkerPseudoElementEnabled
+        // List markers are owned by the list marker pseudo element and so don't get destroyed by this container.
+        // else
         // List markers are owned by their enclosing list and so don't get destroyed by this container.
         if (firstChild()->isListMarker()) {
             firstChild()->remove();
@@ -156,6 +160,9 @@ void LayoutObjectChildList::insertChildNode(LayoutObject* owner, LayoutObject* n
         LayoutCounter::layoutObjectSubtreeAttached(newChild);
     }
 
+    if (RuntimeEnabledFeatures::listMarkerPseudoElementEnabled() && owner->isListItem())
+        newChild->setAncestorNeedsSubtreeChangeNotification(true);
+
     newChild->setNeedsLayoutAndPrefWidthsRecalc(LayoutInvalidationReason::AddedToLayout);
     newChild->setShouldDoFullPaintInvalidation(PaintInvalidationRendererInsertion);
     if (!owner->normalChildNeedsLayout())