Introduce isHTMLTableElement and toHTMLTableElement

Source/core/html/HTMLTableElement.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. 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 82 matching lines @@
     bool m_borderAttr;          // Sets a precise border width and creates an outset border for the table and for its cells.
     bool m_borderColorAttr;     // Overrides the outset border and makes it solid for the table and cells instead.
     bool m_frameAttr;           // Implies a thin border width if no border is set and then a certain set of solid/hidden borders based off the value.
     TableRules m_rulesAttr;     // Implies a thin border width, a collapsing border model, and all borders on the table becoming set to hidden (if frame/border
                                 // are present, to none otherwise).
 
     unsigned short m_padding;
     RefPtr<StylePropertySet> m_sharedCellStyle;
 };
 
+inline bool isHTMLTableElement(const Node* node)
+{
+    return node->hasTagName(HTMLNames::tableTag);
+}
+
+inline bool isHTMLTableElement(const Element* element)
+{
+    return element->hasTagName(HTMLNames::tableTag);
+}
+
+inline HTMLTableElement* toHTMLTableElement(Node* node)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLTableElement(node));
+    return static_cast<HTMLTableElement*>(node);
+}
+
 } //namespace
 
 #endif