Support type selector for camel-cased SVG elements in HTML.

Source/core/dom/SelectorQuery.cpp

 /*
  * Copyright (C) 2011, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 157 matching lines @@
 {
     for (Element& element : ElementTraversal::descendantsOf(rootNode)) {
         if (element.hasClass() && element.classNames().contains(className)) {
             SelectorQueryTrait::appendElement(output, element);
             if (SelectorQueryTrait::shouldOnlyMatchFirstElement)
                 return;
         }
     }
 }
 
+inline bool matchesTagName(const QualifiedName& tagName, const Element& element)
+{
+    if (tagName == anyQName())
+        return true;
+    if (element.hasLocalName(tagName.localName()))
+        return true;
+    // Non-html elements in html documents are normalized to their camel-cased
+    // version during parsing if applicable. Yet, type selectors are lower-cased
+    // for selectors in html documents. Try a case-insensitive match below to
+    // allow type selector matching for such elements.
+    if (!element.isHTMLElement() && element.document().isHTMLDocument())
+        return equalIgnoringCase(tagName.localName(), element.localName());
+    return false;
+}
+
 template <typename SelectorQueryTrait>
 void SelectorDataList::collectElementsByTagName(ContainerNode& rootNode, const QualifiedName& tagName,  typename SelectorQueryTrait::OutputType& output) const
 {
     for (Element& element : ElementTraversal::descendantsOf(rootNode)) {
         // querySelector*() doesn't allow namespaces and throws before it gets
         // here so we can ignore them.
         ASSERT(tagName.namespaceURI() == starAtom);
-        if (tagName == anyQName() || element.hasLocalName(tagName.localName())) {
+        if (matchesTagName(tagName, element)) {
             SelectorQueryTrait::appendElement(output, element);
             if (SelectorQueryTrait::shouldOnlyMatchFirstElement)
                 return;
         }
     }
 }
 
 inline bool SelectorDataList::canUseFastQuery(const ContainerNode& rootNode) const
 {
     return m_selectors.size() == 1 && !m_crossesTreeBoundary && rootNode.inDocument() && !rootNode.document().inQuirksMode();
@@ skipping 342 matching lines @@
 
     return m_entries.add(selectors, SelectorQuery::adopt(selectorList)).storedValue->value.get();
 }
 
 void SelectorQueryCache::invalidate()
 {
     m_entries.clear();
 }
 
 }