Convert qname with prefix to upper-case in tagName

Source/core/html/HTMLElement.cpp

Index: Source/core/html/HTMLElement.cpp
diff --git a/Source/core/html/HTMLElement.cpp b/Source/core/html/HTMLElement.cpp
index 4298135d334e5acb24501637d36695347e4a0811..54450215e918096123df117b4efd0202371755a5 100644
--- a/Source/core/html/HTMLElement.cpp
+++ b/Source/core/html/HTMLElement.cpp
@@ -73,8 +73,11 @@ String HTMLElement::nodeName() const
     // FIXME: Would be nice to have an atomicstring lookup based off uppercase
     // chars that does not have to copy the string on a hit in the hash.
     // FIXME: We should have a way to detect XHTML elements and replace the hasPrefix() check with it.
-    if (document().isHTMLDocument() && !tagQName().hasPrefix())
-        return tagQName().localNameUpper();
+    if (document().isHTMLDocument()) {
+        if (!tagQName().hasPrefix())
+            return tagQName().localNameUpper();
+        return Element::nodeName().upper();
+    }
     return Element::nodeName();
 }