*** DO NOT LAND *** Measure the size and complexity of the old multicol implementation.

Source/core/rendering/RenderBoxModelObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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 258 matching lines @@
 }
 
 LayoutPoint RenderBoxModelObject::adjustedPositionRelativeToOffsetParent(const LayoutPoint& startPoint) const
 {
     // If the element is the HTML body element or doesn't have a parent
     // return 0 and stop this algorithm.
     if (isBody() || !parent())
         return LayoutPoint();
 
     LayoutPoint referencePoint = startPoint;
-    referencePoint.move(parent()->offsetForColumns(referencePoint));
 
     // If the offsetParent of the element is null, or is the HTML body element,
     // return the distance between the canvas origin and the left border edge
     // of the element and stop this algorithm.
     Element* element = offsetParent();
     if (!element)
         return referencePoint;
 
     if (const RenderBoxModelObject* offsetParent = element->renderBoxModelObject()) {
         if (offsetParent->isBox() && !offsetParent->isBody())
             referencePoint.move(-toRenderBox(offsetParent)->borderLeft(), -toRenderBox(offsetParent)->borderTop());
         if (!isOutOfFlowPositioned() || flowThreadContainingBlock()) {
             if (isRelPositioned())
                 referencePoint.move(relativePositionOffset());
             else if (isStickyPositioned())
                 referencePoint.move(stickyPositionOffset());
 
             // CSS regions specification says that region flows should return the body element as their offsetParent.
             // Since we will bypass the body’s renderer anyway, just end the loop if we encounter a region flow (named flow thread).
             // See http://dev.w3.org/csswg/css-regions/#cssomview-offset-attributes
             RenderObject* current;
             for (current = parent(); current != offsetParent && !current->isRenderNamedFlowThread() && current->parent(); current = current->parent()) {
                 // FIXME: What are we supposed to do inside SVG content?
                 if (!isOutOfFlowPositioned()) {
                     if (current->isBox() && !current->isTableRow())
                         referencePoint.moveBy(toRenderBox(current)->topLeftLocation());
-                    referencePoint.move(current->parent()->offsetForColumns(referencePoint));
                 }
             }
 
             // Compute the offset position for elements inside named flow threads for which the offsetParent was the body.
             // See https://code.google.com/p/chromium/issues/detail?id=242168
             if (current->isRenderNamedFlowThread())
                 referencePoint = toRenderNamedFlowThread(current)->adjustedPositionRelativeToOffsetParent(*this, referencePoint);
             else if (offsetParent->isBox() && offsetParent->isBody() && !offsetParent->isPositioned())
                 referencePoint.moveBy(toRenderBox(offsetParent)->topLeftLocation());
         }
@@ skipping 2430 matching lines @@
         // If there is no region to use the FlowThread, then there's no region range for the content in that FlowThread.
         // An API like elementFromPoint might crash without this check.
         if (startRegion)
             o = startRegion;
     }
 
     o->mapAbsoluteToLocalPoint(mode, transformState);
 
     LayoutSize containerOffset = offsetFromContainer(o, LayoutPoint());
 
-    if (!style()->hasOutOfFlowPosition() && o->hasColumns()) {
-        RenderBlock* block = toRenderBlock(o);
-        LayoutPoint point(roundedLayoutPoint(transformState.mappedPoint()));
-        point -= containerOffset;
-        block->adjustForColumnRect(containerOffset, point);
-    }
-
     bool preserve3D = mode & UseTransforms && (o->style()->preserves3D() || style()->preserves3D());
     if (mode & UseTransforms && shouldUseTransformFromContainer(o)) {
         TransformationMatrix t;
         getTransformFromContainer(o, containerOffset, t);
         transformState.applyTransform(t, preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
     } else
         transformState.move(containerOffset.width(), containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
 }
 
 const RenderObject* RenderBoxModelObject::pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap& geometryMap) const
@@ skipping 64 matching lines @@
     ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
     for (RenderObject* child = startChild; child && child != endChild; ) {
         // Save our next sibling as moveChildTo will clear it.
         RenderObject* nextSibling = child->nextSibling();
         moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
         child = nextSibling;
     }
 }
 
 } // namespace WebCore