Convert first letter into a pseudo element.

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index 5b284e56c33de317f01c11a965c6d57f97100d31..354388db49f6cc0a808156e54208c4706d0732d3 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -1684,6 +1684,8 @@ static void traverseTreeAndMark(const String& baseIndent, const Node* rootNode,
                 traverseTreeAndMark(indent.toString(), pseudo, markedNode1, markedLabel1, markedNode2, markedLabel2);
             if (Element* pseudo = element.pseudoElement(AFTER))
                 traverseTreeAndMark(indent.toString(), pseudo, markedNode1, markedLabel1, markedNode2, markedLabel2);
+            if (Element* pseudo = element.pseudoElement(FIRST_LETTER))
+                traverseTreeAndMark(indent.toString(), pseudo, markedNode1, markedLabel1, markedNode2, markedLabel2);
             if (Element* pseudo = element.pseudoElement(BACKDROP))
                 traverseTreeAndMark(indent.toString(), pseudo, markedNode1, markedLabel1, markedNode2, markedLabel2);
         }