Convert first letter into a pseudo element.

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index f28fedfd783af02831e7a58a00040231eb7f4f93..17b4db66d011a767059e86202ce55a459c5c1d65 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -637,7 +637,7 @@ public:
     void clearNode() { m_node = nullptr; }
 
     // Returns the styled node that caused the generation of this renderer.
-    // This is the same as node() except for renderers of :before and :after
+    // This is the same as node() except for renderers of :before, :after and :first-letter
     // pseudo elements for which their parent node is returned.
     Node* generatingNode() const { return isPseudoElement() ? node()->parentOrShadowHostNode() : node(); }