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 971504ef70b6f112e689dd27031c569032eb9b01..f496dde805cdfcd317a386572af4c951d8036c0b 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -1688,6 +1688,8 @@ 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);
         }