*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/rendering/HitTestResult.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 24 matching lines @@
 
 namespace WebCore {
 
 class Element;
 class Frame;
 class HTMLMediaElement;
 class Image;
 class KURL;
 class Node;
 class RenderObject;
-class RenderRegion;
 class Scrollbar;
 
 class HitTestResult {
 public:
     typedef ListHashSet<RefPtr<Node> > NodeSet;
 
     HitTestResult();
     HitTestResult(const LayoutPoint&);
     // Pass non-negative padding values to perform a rect-based hit test.
     HitTestResult(const LayoutPoint& centerPoint, unsigned topPadding, unsigned rightPadding, unsigned bottomPadding, unsigned leftPadding);
@@ skipping 85 matching lines @@
     RefPtr<Scrollbar> m_scrollbar;
     bool m_isOverWidget; // Returns true if we are over a widget (and not in the border/padding area of a RenderWidget for example).
     bool m_isFirstLetter;
 
     mutable OwnPtr<NodeSet> m_rectBasedTestResult;
 };
 
 } // namespace WebCore
 
 #endif // HitTestResult_h