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

Source/core/css/ElementRuleCollector.cpp

Index: Source/core/css/ElementRuleCollector.cpp
diff --git a/Source/core/css/ElementRuleCollector.cpp b/Source/core/css/ElementRuleCollector.cpp
index 3323fd75aba6a469845221af945a2e73e858f94e..32c7e791296e0ce805cb558c455dd4bb9e417f23 100644
--- a/Source/core/css/ElementRuleCollector.cpp
+++ b/Source/core/css/ElementRuleCollector.cpp
@@ -166,7 +166,10 @@ void ElementRuleCollector::collectMatchingRules(const MatchRequest& matchRequest
         collectMatchingRulesForList(matchRequest.ruleSet->linkPseudoClassRules(), cascadeOrder, matchRequest, ruleRange);
     if (SelectorChecker::matchesFocusPseudoClass(element))
         collectMatchingRulesForList(matchRequest.ruleSet->focusPseudoClassRules(), cascadeOrder, matchRequest, ruleRange);
-    collectMatchingRulesForList(matchRequest.ruleSet->tagRules(element.localName()), cascadeOrder, matchRequest, ruleRange);
+    AtomicString localName = element.localName();
+    if (!element.isHTMLElement() && element.document().isHTMLDocument())
+        localName = localName.lower();
+    collectMatchingRulesForList(matchRequest.ruleSet->tagRules(localName), cascadeOrder, matchRequest, ruleRange);
     collectMatchingRulesForList(matchRequest.ruleSet->universalRules(), cascadeOrder, matchRequest, ruleRange);
 }