Convert first letter into a pseudo element.

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index 28550e67db9a5df2dac7e6b32080e76d7740b332..0ca859eb01c19837529f5c296eb3d25b88d8bb9f 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -719,12 +719,17 @@ PassRefPtrWillBeRawPtr<PseudoElement> StyleResolver::createPseudoElementIfNeeded
     if (!parentRenderer)
         return nullptr;
 
-    if (pseudoId < FIRST_INTERNAL_PSEUDOID && !parentRenderer->style()->hasPseudoStyle(pseudoId))
+    // The first letter pseudo element has to look up the tree and see if any
+    // of the ancestors are first letter.
+    if (pseudoId < FIRST_INTERNAL_PSEUDOID && pseudoId != FIRST_LETTER && !parentRenderer->style()->hasPseudoStyle(pseudoId))
         return nullptr;
 
     if (pseudoId == BACKDROP && !parent.isInTopLayer())
         return nullptr;
 
+    if (pseudoId == FIRST_LETTER && !parent.firstLetterTextRenderer())
+        return nullptr;
+
     if (!parentRenderer->canHaveGeneratedChildren())
         return nullptr;