getElementsByTagName() should take a qualifiedName in parameter

third_party/WebKit/Source/core/html/HTMLTagCollection.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 18 matching lines @@
 #include "core/dom/TagCollection.h"
 
 namespace blink {
 
 // Collection that limits to a particular tag and whose rootNode is in an
 // HTMLDocument.
 class HTMLTagCollection final : public TagCollection {
  public:
   static HTMLTagCollection* Create(ContainerNode& root_node,
                                    CollectionType type,
-                                   const AtomicString& local_name) {
+                                   const AtomicString& qualified_name) {
     DCHECK_EQ(type, kHTMLTagCollectionType);
-    return new HTMLTagCollection(root_node, local_name);
+    return new HTMLTagCollection(root_node, qualified_name);
   }
 
   bool ElementMatches(const Element&) const;
 
  private:
-  HTMLTagCollection(ContainerNode& root_node, const AtomicString& local_name);
+  HTMLTagCollection(ContainerNode& root_node,
+                    const AtomicString& qualified_name);
 
-  AtomicString lowered_local_name_;
+  AtomicString lowered_qualified_name_;
 };
 
 DEFINE_TYPE_CASTS(HTMLTagCollection,
                   LiveNodeListBase,
                   collection,
                   collection->GetType() == kHTMLTagCollectionType,
                   collection.GetType() == kHTMLTagCollectionType);
 
 inline bool HTMLTagCollection::ElementMatches(
     const Element& test_element) const {
-  // Implements
-  // https://dom.spec.whatwg.org/#concept-getelementsbytagname
-  if (local_name_ != g_star_atom) {
-    const AtomicString& local_name =
-        test_element.IsHTMLElement() ? lowered_local_name_ : local_name_;
-    if (local_name != test_element.localName())
-      return false;
-  }
-  DCHECK_EQ(namespace_uri_, g_star_atom);
-  return true;
+  if (qualified_name_ == g_star_atom)
+    return true;
+  if (test_element.IsHTMLElement())
+    return lowered_qualified_name_ == test_element.TagQName().ToString();
+  return qualified_name_ == test_element.TagQName().ToString();
 }
 
 }  // namespace blink
 
 #endif  // HTMLTagCollection_h