Introduce isHTMLTableElement and toHTMLTableElement

Source/core/html/parser/HTMLElementStack.cpp

Index: Source/core/html/parser/HTMLElementStack.cpp
diff --git a/Source/core/html/parser/HTMLElementStack.cpp b/Source/core/html/parser/HTMLElementStack.cpp
index ed7cccc23df1d7cac3225f51eade1ab28aca69e2..1c2e2fa4091c846b82202755ae0203f879837d3c 100644
--- a/Source/core/html/parser/HTMLElementStack.cpp
+++ b/Source/core/html/parser/HTMLElementStack.cpp
@@ -32,6 +32,7 @@
 #include "SVGNames.h"
 #include "core/dom/Element.h"
 #include "core/html/HTMLOptGroupElement.h"
+#include "core/html/HTMLTableElement.h"
 #include <wtf/PassOwnPtr.h>
 
 namespace WebCore {
@@ -53,7 +54,7 @@ inline bool isScopeMarker(HTMLStackItem* item)
         || item->hasTagName(captionTag)
         || item->hasTagName(marqueeTag)
         || item->hasTagName(objectTag)
-        || item->hasTagName(tableTag)
+        || isHTMLTableElement(item->node())
         || item->hasTagName(tdTag)
         || item->hasTagName(thTag)
         || item->hasTagName(MathMLNames::miTag)
@@ -78,7 +79,7 @@ inline bool isListItemScopeMarker(HTMLStackItem* item)
 
 inline bool isTableScopeMarker(HTMLStackItem* item)
 {
-    return item->hasTagName(tableTag)
+    return isHTMLTableElement(item->node())
         || item->hasTagName(templateTag)
         || isRootNode(item);
 }