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

Source/core/dom/ElementRareData.h

Index: Source/core/dom/ElementRareData.h
diff --git a/Source/core/dom/ElementRareData.h b/Source/core/dom/ElementRareData.h
index 631446dcabadc5fd9dd9543c8b5932d5b8e0a9f6..a492285781577b1bc7e40f57de95d6b7817e4fce 100644
--- a/Source/core/dom/ElementRareData.h
+++ b/Source/core/dom/ElementRareData.h
@@ -63,12 +63,6 @@ public:
     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; }
 
@@ -176,9 +170,6 @@ private:
     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;
@@ -223,8 +214,6 @@ inline ElementRareData::ElementRareData(RenderObject* renderer)
     , m_childrenAffectedByDirectAdjacentRules(false)
     , m_childrenAffectedByForwardPositionalRules(false)
     , m_childrenAffectedByBackwardPositionalRules(false)
-    , m_isInsideRegion(false)
-    , m_regionOversetState(RegionUndefined)
     , m_minimumSizeForResizing(defaultMinimumSizeForResizing())
 {
 }