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

Source/core/dom/ElementRareData.h

 /*
  * Copyright (C) 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith <catfish.man@gmail.com>
  *
  * 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 45 matching lines @@
 
     bool needsFocusAppearanceUpdateSoonAfterAttach() const { return m_needsFocusAppearanceUpdateSoonAfterAttach; }
     void setNeedsFocusAppearanceUpdateSoonAfterAttach(bool needs) { m_needsFocusAppearanceUpdateSoonAfterAttach = needs; }
 
     bool styleAffectedByEmpty() const { return m_styleAffectedByEmpty; }
     void setStyleAffectedByEmpty(bool value) { m_styleAffectedByEmpty = value; }
 
     bool isInCanvasSubtree() const { return m_isInCanvasSubtree; }
     void setIsInCanvasSubtree(bool value) { m_isInCanvasSubtree = value; }
 
-    bool isInsideRegion() const { return m_isInsideRegion; }
-    void setIsInsideRegion(bool value) { m_isInsideRegion = value; }
-
-    RegionOversetState regionOversetState() const { return m_regionOversetState; }
-    void setRegionOversetState(RegionOversetState state) { m_regionOversetState = state; }
-
     bool containsFullScreenElement() { return m_containsFullScreenElement; }
     void setContainsFullScreenElement(bool value) { m_containsFullScreenElement = value; }
 
     bool isInTopLayer() const { return m_isInTopLayer; }
     void setIsInTopLayer(bool value) { m_isInTopLayer = value; }
 
     bool childrenAffectedByFocus() const { return m_childrenAffectedByFocus; }
     void setChildrenAffectedByFocus(bool value) { m_childrenAffectedByFocus = value; }
     bool childrenAffectedByHover() const { return m_childrenAffectedByHover; }
     void setChildrenAffectedByHover(bool value) { m_childrenAffectedByHover = value; }
@@ skipping 87 matching lines @@
     unsigned m_childrenAffectedByDrag : 1;
     // Bits for dynamic child matching.
     // We optimize for :first-child and :last-child. The other positional child selectors like nth-child or
     // *-child-of-type, we will just give up and re-evaluate whenever children change at all.
     unsigned m_childrenAffectedByFirstChildRules : 1;
     unsigned m_childrenAffectedByLastChildRules : 1;
     unsigned m_childrenAffectedByDirectAdjacentRules : 1;
     unsigned m_childrenAffectedByForwardPositionalRules : 1;
     unsigned m_childrenAffectedByBackwardPositionalRules : 1;
 
-    unsigned m_isInsideRegion : 1;
-    RegionOversetState m_regionOversetState;
-
     LayoutSize m_minimumSizeForResizing;
     IntSize m_savedLayerScrollOffset;
     RefPtr<RenderStyle> m_computedStyle;
 
     OwnPtr<DatasetDOMStringMap> m_dataset;
     OwnPtr<ClassList> m_classList;
     OwnPtr<ElementShadow> m_shadow;
     OwnPtr<NamedNodeMap> m_attributeMap;
     OwnPtr<InputMethodContext> m_inputMethodContext;
     OwnPtr<ActiveAnimations> m_activeAnimations;
@@ skipping 24 matching lines @@
     , m_hasPendingResources(false)
     , m_childrenAffectedByFocus(false)
     , m_childrenAffectedByHover(false)
     , m_childrenAffectedByActive(false)
     , m_childrenAffectedByDrag(false)
     , m_childrenAffectedByFirstChildRules(false)
     , m_childrenAffectedByLastChildRules(false)
     , m_childrenAffectedByDirectAdjacentRules(false)
     , m_childrenAffectedByForwardPositionalRules(false)
     , m_childrenAffectedByBackwardPositionalRules(false)
-    , m_isInsideRegion(false)
-    , m_regionOversetState(RegionUndefined)
     , m_minimumSizeForResizing(defaultMinimumSizeForResizing())
 {
 }
 
 inline ElementRareData::~ElementRareData()
 {
     ASSERT(!m_shadow);
     ASSERT(!m_generatedBefore);
     ASSERT(!m_generatedAfter);
     ASSERT(!m_backdrop);
@@ skipping 63 matching lines @@
     setChildrenAffectedByFirstChildRules(false);
     setChildrenAffectedByLastChildRules(false);
     setChildrenAffectedByDirectAdjacentRules(false);
     setChildrenAffectedByForwardPositionalRules(false);
     setChildrenAffectedByBackwardPositionalRules(false);
 }
 
 } // namespace
 
 #endif // ElementRareData_h