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

Source/core/css/SelectorChecker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 81 matching lines @@
 static bool matchesListBoxPseudoClass(const Element& element)
 {
     return isHTMLSelectElement(element) && !toHTMLSelectElement(element).usesMenuList();
 }
 
 static bool matchesTagName(const Element& element, const QualifiedName& tagQName)
 {
     if (tagQName == anyQName())
         return true;
     const AtomicString& localName = tagQName.localName();
-    if (localName != starAtom && localName != element.localName())
-        return false;
+    if (localName != starAtom && localName != element.localName()) {
+        if (element.isHTMLElement() || !element.document().isHTMLDocument())
+            return false;
+        // 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 (!equalIgnoringCase(localName, element.localName()))
+            return false;
+    }
     const AtomicString& namespaceURI = tagQName.namespaceURI();
     return namespaceURI == starAtom || namespaceURI == element.namespaceURI();
 }
 
 static Element* parentElement(const SelectorChecker::SelectorCheckingContext& context)
 {
     // - If context.scope is a shadow root, we should walk up to its shadow host.
     // - If context.scope is some element in some shadow tree and querySelector initialized the context,
     //   e.g. shadowRoot.querySelector(':host *'),
     //   (a) context.element has the same treescope as context.scope, need to walk up to its shadow host.
@@ skipping 1024 matching lines @@
     return element.focused() && isFrameFocused(element);
 }
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const DOMSiblingTraversalStrategy&, MatchResult*) const;
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const ShadowDOMSiblingTraversalStrategy&, MatchResult*) const;
 
 }