external/webkit r30707

1 files changed, 4399 insertions, 0 deletions

diff --git a/WebCore/rendering/RenderBlock.cpp b/WebCore/rendering/RenderBlock.cpp
new file mode 100644
index 0000000..0fa0b6f
--- /dev/null
+++ b/WebCore/rendering/RenderBlock.cpp
@@ -0,0 +1,4399 @@
+/*
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ *           (C) 1999 Antti Koivisto (koivisto@kde.org)
+ *           (C) 2007 David Smith (catfish.man@gmail.com)
+ * Copyright (C) 2003, 2004, 2005, 2006, 2007 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
+ * 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,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+#include "RenderBlock.h"
+
+#include "Document.h"
+#include "Element.h"
+#include "Frame.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "HTMLNames.h"
+#include "HitTestResult.h"
+#include "InlineTextBox.h"
+#include "RenderImage.h"
+#include "RenderTableCell.h"
+#include "RenderTextFragment.h"
+#include "RenderTheme.h"
+#include "RenderView.h"
+#include "SelectionController.h"
+
+using namespace std;
+using namespace WTF;
+using namespace Unicode;
+
+namespace WebCore {
+
+// Number of pixels to allow as a fudge factor when clicking above or below a line.
+// clicking up to verticalLineClickFudgeFactor pixels above a line will correspond to the closest point on the line.   
+const int verticalLineClickFudgeFactor= 3;
+
+using namespace HTMLNames;
+
+struct ColumnInfo {
+    ColumnInfo()
+        : m_desiredColumnWidth(0)
+        , m_desiredColumnCount(1)
+        { }
+    int m_desiredColumnWidth;
+    unsigned m_desiredColumnCount;
+    Vector<IntRect> m_columnRects;
+};
+
+typedef WTF::HashMap<const RenderBox*, ColumnInfo*> ColumnInfoMap;
+static ColumnInfoMap* gColumnInfoMap = 0;
+
+// Our MarginInfo state used when laying out block children.
+RenderBlock::MarginInfo::MarginInfo(RenderBlock* block, int top, int bottom)
+{
+    // Whether or not we can collapse our own margins with our children.  We don't do this
+    // if we had any border/padding (obviously), if we're the root or HTML elements, or if
+    // we're positioned, floating, a table cell.
+    m_canCollapseWithChildren = !block->isRenderView() && !block->isRoot() && !block->isPositioned() &&
+        !block->isFloating() && !block->isTableCell() && !block->hasOverflowClip() && !block->isInlineBlockOrInlineTable();
+
+    m_canCollapseTopWithChildren = m_canCollapseWithChildren && (top == 0) && block->style()->marginTopCollapse() != MSEPARATE;
+
+    // If any height other than auto is specified in CSS, then we don't collapse our bottom
+    // margins with our children's margins.  To do otherwise would be to risk odd visual
+    // effects when the children overflow out of the parent block and yet still collapse
+    // with it.  We also don't collapse if we have any bottom border/padding.
+    m_canCollapseBottomWithChildren = m_canCollapseWithChildren && (bottom == 0) &&
+        (block->style()->height().isAuto() && block->style()->height().value() == 0) && block->style()->marginBottomCollapse() != MSEPARATE;
+    
+    m_quirkContainer = block->isTableCell() || block->isBody() || block->style()->marginTopCollapse() == MDISCARD || 
+        block->style()->marginBottomCollapse() == MDISCARD;
+
+    m_atTopOfBlock = true;
+    m_atBottomOfBlock = false;
+
+    m_posMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(true) : 0;
+    m_negMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(false) : 0;
+
+    m_selfCollapsingBlockClearedFloat = false;
+    
+    m_topQuirk = m_bottomQuirk = m_determinedTopQuirk = false;
+}
+
+// -------------------------------------------------------------------------------------------------------
+
+RenderBlock::RenderBlock(Node* node)
+      : RenderFlow(node)
+      , m_floatingObjects(0)
+      , m_positionedObjects(0)
+      , m_maxMargin(0)
+      , m_overflowHeight(0)
+      , m_overflowWidth(0)
+      , m_overflowLeft(0)
+      , m_overflowTop(0)
+{
+}
+
+RenderBlock::~RenderBlock()
+{
+    delete m_floatingObjects;
+    delete m_positionedObjects;
+    delete m_maxMargin;
+    
+    if (m_hasColumns)
+        delete gColumnInfoMap->take(this);
+}
+
+void RenderBlock::setStyle(RenderStyle* _style)
+{
+    setReplaced(_style->isDisplayReplacedType());
+
+    RenderFlow::setStyle(_style);
+
+    // FIXME: We could save this call when the change only affected non-inherited properties
+    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
+        if (child->isAnonymousBlock()) {
+            RenderStyle* newStyle = new (renderArena()) RenderStyle();
+            newStyle->inheritFrom(style());
+            newStyle->setDisplay(BLOCK);
+            child->setStyle(newStyle);
+        }
+    }
+
+    m_lineHeight = -1;
+
+    // Update pseudos for :before and :after now.
+    if (!isAnonymous() && canHaveChildren()) {
+        updateBeforeAfterContent(RenderStyle::BEFORE);
+        updateBeforeAfterContent(RenderStyle::AFTER);
+    }
+    updateFirstLetter();
+}
+
+void RenderBlock::addChildToFlow(RenderObject* newChild, RenderObject* beforeChild)
+{
+    // Make sure we don't append things after :after-generated content if we have it.
+    if (!beforeChild && isAfterContent(lastChild()))
+        beforeChild = lastChild();
+    
+    bool madeBoxesNonInline = false;
+
+    // If the requested beforeChild is not one of our children, then this is most likely because
+    // there is an anonymous block box within this object that contains the beforeChild. So
+    // just insert the child into the anonymous block box instead of here.
+    if (beforeChild && beforeChild->parent() != this) {
+
+        ASSERT(beforeChild->parent());
+        ASSERT(beforeChild->parent()->isAnonymousBlock());
+
+        if (newChild->isInline()) {
+            beforeChild->parent()->addChild(newChild,beforeChild);
+            return;
+        }
+        else if (beforeChild->parent()->firstChild() != beforeChild)
+            return beforeChild->parent()->addChild(newChild, beforeChild);
+        else
+            return addChildToFlow(newChild, beforeChild->parent());
+    }
+
+    // A block has to either have all of its children inline, or all of its children as blocks.
+    // So, if our children are currently inline and a block child has to be inserted, we move all our
+    // inline children into anonymous block boxes
+    if ( m_childrenInline && !newChild->isInline() && !newChild->isFloatingOrPositioned() )
+    {
+        // This is a block with inline content. Wrap the inline content in anonymous blocks.
+        makeChildrenNonInline(beforeChild);
+        madeBoxesNonInline = true;
+        
+        if (beforeChild && beforeChild->parent() != this) {
+            beforeChild = beforeChild->parent();
+            ASSERT(beforeChild->isAnonymousBlock());
+            ASSERT(beforeChild->parent() == this);
+        }
+    }
+    else if (!m_childrenInline && !newChild->isFloatingOrPositioned())
+    {
+        // If we're inserting an inline child but all of our children are blocks, then we have to make sure
+        // it is put into an anomyous block box. We try to use an existing anonymous box if possible, otherwise
+        // a new one is created and inserted into our list of children in the appropriate position.
+        if (newChild->isInline()) {
+            if (beforeChild) {
+                if (beforeChild->previousSibling() && beforeChild->previousSibling()->isAnonymousBlock()) {
+                    beforeChild->previousSibling()->addChild(newChild);
+                    return;
+                }
+            }
+            else {
+                if (lastChild() && lastChild()->isAnonymousBlock()) {
+                    lastChild()->addChild(newChild);
+                    return;
+                }
+            }
+
+            // no suitable existing anonymous box - create a new one
+            RenderBlock* newBox = createAnonymousBlock();
+            RenderContainer::addChild(newBox,beforeChild);
+            newBox->addChild(newChild);
+            return;
+        }
+    }
+
+    RenderContainer::addChild(newChild,beforeChild);
+    // ### care about aligned stuff
+
+    if (madeBoxesNonInline && parent() && isAnonymousBlock())
+        parent()->removeLeftoverAnonymousBlock(this);
+    // this object may be dead here
+}
+
+static void getInlineRun(RenderObject* start, RenderObject* boundary,
+                         RenderObject*& inlineRunStart,
+                         RenderObject*& inlineRunEnd)
+{
+    // Beginning at |start| we find the largest contiguous run of inlines that
+    // we can.  We denote the run with start and end points, |inlineRunStart|
+    // and |inlineRunEnd|.  Note that these two values may be the same if
+    // we encounter only one inline.
+    //
+    // We skip any non-inlines we encounter as long as we haven't found any
+    // inlines yet.
+    //
+    // |boundary| indicates a non-inclusive boundary point.  Regardless of whether |boundary|
+    // is inline or not, we will not include it in a run with inlines before it.  It's as though we encountered
+    // a non-inline.
+    
+    // Start by skipping as many non-inlines as we can.
+    RenderObject * curr = start;
+    bool sawInline;
+    do {
+        while (curr && !(curr->isInline() || curr->isFloatingOrPositioned()))
+            curr = curr->nextSibling();
+        
+        inlineRunStart = inlineRunEnd = curr;
+        
+        if (!curr)
+            return; // No more inline children to be found.
+        
+        sawInline = curr->isInline();
+        
+        curr = curr->nextSibling();
+        while (curr && (curr->isInline() || curr->isFloatingOrPositioned()) && (curr != boundary)) {
+            inlineRunEnd = curr;
+            if (curr->isInline())
+                sawInline = true;
+            curr = curr->nextSibling();
+        }
+    } while (!sawInline);
+}
+
+void RenderBlock::deleteLineBoxTree()
+{
+    InlineFlowBox* line = m_firstLineBox;
+    InlineFlowBox* nextLine;
+    while (line) {
+        nextLine = line->nextFlowBox();
+        line->deleteLine(renderArena());
+        line = nextLine;
+    }
+    m_firstLineBox = m_lastLineBox = 0;
+}
+
+void RenderBlock::makeChildrenNonInline(RenderObject *insertionPoint)
+{    
+    // makeChildrenNonInline takes a block whose children are *all* inline and it
+    // makes sure that inline children are coalesced under anonymous
+    // blocks.  If |insertionPoint| is defined, then it represents the insertion point for
+    // the new block child that is causing us to have to wrap all the inlines.  This
+    // means that we cannot coalesce inlines before |insertionPoint| with inlines following
+    // |insertionPoint|, because the new child is going to be inserted in between the inlines,
+    // splitting them.
+    ASSERT(isInlineBlockOrInlineTable() || !isInline());
+    ASSERT(!insertionPoint || insertionPoint->parent() == this);
+
+    m_childrenInline = false;
+
+    RenderObject *child = firstChild();
+    if (!child)
+        return;
+
+    deleteLineBoxTree();
+
+    while (child) {
+        RenderObject *inlineRunStart, *inlineRunEnd;
+        getInlineRun(child, insertionPoint, inlineRunStart, inlineRunEnd);
+
+        if (!inlineRunStart)
+            break;
+
+        child = inlineRunEnd->nextSibling();
+
+        RenderBlock* box = createAnonymousBlock();
+        insertChildNode(box, inlineRunStart);
+        RenderObject* o = inlineRunStart;
+        while(o != inlineRunEnd)
+        {
+            RenderObject* no = o;
+            o = no->nextSibling();
+            box->moveChildNode(no);
+        }
+        box->moveChildNode(inlineRunEnd);
+    }
+
+#ifndef NDEBUG
+    for (RenderObject *c = firstChild(); c; c = c->nextSibling())
+        ASSERT(!c->isInline());
+#endif
+
+    repaint();
+}
+
+void RenderBlock::removeChild(RenderObject *oldChild)
+{
+    // If this child is a block, and if our previous and next siblings are
+    // both anonymous blocks with inline content, then we can go ahead and
+    // fold the inline content back together.
+    RenderObject* prev = oldChild->previousSibling();
+    RenderObject* next = oldChild->nextSibling();
+    bool canDeleteAnonymousBlocks = !documentBeingDestroyed() && !isInline() && !oldChild->isInline() && 
+                                    !oldChild->continuation() && 
+                                    (!prev || (prev->isAnonymousBlock() && prev->childrenInline())) &&
+                                    (!next || (next->isAnonymousBlock() && next->childrenInline()));
+    if (canDeleteAnonymousBlocks && prev && next) {
+        // Take all the children out of the |next| block and put them in
+        // the |prev| block.
+        prev->setNeedsLayoutAndPrefWidthsRecalc();
+        RenderObject* o = next->firstChild();
+        while (o) {
+            RenderObject* no = o;
+            o = no->nextSibling();
+            prev->moveChildNode(no);
+        }
+ 
+        RenderBlock* nextBlock = static_cast<RenderBlock*>(next);
+        nextBlock->deleteLineBoxTree();
+        
+        // Nuke the now-empty block.
+        next->destroy();
+    }
+
+    RenderFlow::removeChild(oldChild);
+
+    RenderObject* child = prev ? prev : next;
+    if (canDeleteAnonymousBlocks && child && !child->previousSibling() && !child->nextSibling() && !isFlexibleBox()) {
+        // The removal has knocked us down to containing only a single anonymous
+        // box.  We can go ahead and pull the content right back up into our
+        // box.
+        setNeedsLayoutAndPrefWidthsRecalc();
+        RenderBlock* anonBlock = static_cast<RenderBlock*>(removeChildNode(child, false));
+        m_childrenInline = true;
+        RenderObject* o = anonBlock->firstChild();
+        while (o) {
+            RenderObject* no = o;
+            o = no->nextSibling();
+            moveChildNode(no);
+        }
+
+        // Delete the now-empty block's lines and nuke it.
+        anonBlock->deleteLineBoxTree();
+        anonBlock->destroy();
+    }
+}
+
+int RenderBlock::overflowHeight(bool includeInterior) const
+{
+    if (!includeInterior && hasOverflowClip()) {
+        if (ShadowData* boxShadow = style()->boxShadow())
+            return m_height + max(boxShadow->y + boxShadow->blur, 0);
+        return m_height;
+    }
+    return m_overflowHeight;
+}
+
+int RenderBlock::overflowWidth(bool includeInterior) const
+{
+    if (!includeInterior && hasOverflowClip()) {
+        if (ShadowData* boxShadow = style()->boxShadow())
+            return m_width + max(boxShadow->x + boxShadow->blur, 0);
+        return m_width;
+    }
+    return m_overflowWidth;
+}
+
+int RenderBlock::overflowLeft(bool includeInterior) const
+{
+    if (!includeInterior && hasOverflowClip()) {
+        if (ShadowData* boxShadow = style()->boxShadow())
+            return min(boxShadow->x - boxShadow->blur, 0);
+        return 0;
+    }
+    return m_overflowLeft;
+}
+
+int RenderBlock::overflowTop(bool includeInterior) const
+{
+    if (!includeInterior && hasOverflowClip()) {
+        if (ShadowData* boxShadow = style()->boxShadow())
+            return min(boxShadow->y - boxShadow->blur, 0);
+        return 0;
+    }
+    return m_overflowTop;
+}
+
+IntRect RenderBlock::overflowRect(bool includeInterior) const
+{
+    if (!includeInterior && hasOverflowClip()) {
+        IntRect box = borderBox();
+        if (ShadowData* boxShadow = style()->boxShadow()) {
+            int shadowLeft = min(boxShadow->x - boxShadow->blur, 0);
+            int shadowRight = max(boxShadow->x + boxShadow->blur, 0);
+            int shadowTop = min(boxShadow->y - boxShadow->blur, 0);
+            int shadowBottom = max(boxShadow->y + boxShadow->blur, 0);
+            box.move(shadowLeft, shadowTop);
+            box.setWidth(box.width() - shadowLeft + shadowRight);
+            box.setHeight(box.height() - shadowTop + shadowBottom);
+        }
+        return box;
+    }
+
+    if (!includeInterior && hasOverflowClip())
+        return borderBox();
+    int l = overflowLeft(includeInterior);
+    int t = min(overflowTop(includeInterior), -borderTopExtra());
+    return IntRect(l, t, overflowWidth(includeInterior) - l, max(overflowHeight(includeInterior), height() + borderBottomExtra()) - t);
+}
+
+bool RenderBlock::isSelfCollapsingBlock() const
+{
+    // We are not self-collapsing if we
+    // (a) have a non-zero height according to layout (an optimization to avoid wasting time)
+    // (b) are a table,
+    // (c) have border/padding,
+    // (d) have a min-height
+    // (e) have specified that one of our margins can't collapse using a CSS extension
+    if (m_height > 0 ||
+        isTable() || (borderBottom() + paddingBottom() + borderTop() + paddingTop()) != 0 ||
+        style()->minHeight().isPositive() || 
+        style()->marginTopCollapse() == MSEPARATE || style()->marginBottomCollapse() == MSEPARATE)
+        return false;
+
+    bool hasAutoHeight = style()->height().isAuto();
+    if (style()->height().isPercent() && !style()->htmlHacks()) {
+        hasAutoHeight = true;
+        for (RenderBlock* cb = containingBlock(); !cb->isRenderView(); cb = cb->containingBlock()) {
+            if (cb->style()->height().isFixed() || cb->isTableCell())
+                hasAutoHeight = false;
+        }
+    }
+
+    // If the height is 0 or auto, then whether or not we are a self-collapsing block depends
+    // on whether we have content that is all self-collapsing or not.
+    if (hasAutoHeight || ((style()->height().isFixed() || style()->height().isPercent()) && style()->height().isZero())) {
+        // If the block has inline children, see if we generated any line boxes.  If we have any
+        // line boxes, then we can't be self-collapsing, since we have content.
+        if (childrenInline())
+            return !firstLineBox();
+        
+        // Whether or not we collapse is dependent on whether all our normal flow children
+        // are also self-collapsing.
+        for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
+            if (child->isFloatingOrPositioned())
+                continue;
+            if (!child->isSelfCollapsingBlock())
+                return false;
+        }
+        return true;
+    }
+    return false;
+}
+
+void RenderBlock::layout()
+{
+    // Update our first letter info now.
+    updateFirstLetter();
+
+    // Table cells call layoutBlock directly, so don't add any logic here.  Put code into
+    // layoutBlock().
+    layoutBlock(false);
+    
+    // It's safe to check for control clip here, since controls can never be table cells.
+    if (hasControlClip()) {
+        // Because of the lightweight clip, there can never be any overflow from children.
+        m_overflowWidth = m_width;
+        m_overflowHeight = m_height;
+        m_overflowLeft = 0;
+        m_overflowTop = 0;
+    }
+}
+
+void RenderBlock::layoutBlock(bool relayoutChildren)
+{
+    ASSERT(needsLayout());
+
+    if (isInline() && !isInlineBlockOrInlineTable()) // Inline <form>s inside various table elements can
+        return;                                      // cause us to come in here.  Just bail.
+
+    if (!relayoutChildren && layoutOnlyPositionedObjects())
+        return;
+
+    IntRect oldBounds;
+    IntRect oldOutlineBox;
+    bool checkForRepaint = checkForRepaintDuringLayout();
+    if (checkForRepaint) {
+        oldBounds = absoluteClippedOverflowRect();
+        oldOutlineBox = absoluteOutlineBox();
+    }
+
+    bool hadColumns = m_hasColumns;
+    if (!hadColumns)
+        view()->pushLayoutState(this, IntSize(xPos(), yPos()));
+    else
+        view()->disableLayoutState();
+
+    int oldWidth = m_width;
+    int oldColumnWidth = desiredColumnWidth();
+
+    calcWidth();
+    calcColumnWidth();
+
+    m_overflowWidth = m_width;
+    m_overflowLeft = 0;
+
+    if (oldWidth != m_width || oldColumnWidth != desiredColumnWidth())
+        relayoutChildren = true;
+
+    clearFloats();
+
+    int previousHeight = m_height;
+    m_height = 0;
+    m_overflowHeight = 0;
+    m_clearStatus = CNONE;
+
+    // We use four values, maxTopPos, maxPosNeg, maxBottomPos, and maxBottomNeg, to track
+    // our current maximal positive and negative margins.  These values are used when we
+    // are collapsed with adjacent blocks, so for example, if you have block A and B
+    // collapsing together, then you'd take the maximal positive margin from both A and B
+    // and subtract it from the maximal negative margin from both A and B to get the
+    // true collapsed margin.  This algorithm is recursive, so when we finish layout()
+    // our block knows its current maximal positive/negative values.
+    //
+    // Start out by setting our margin values to our current margins.  Table cells have
+    // no margins, so we don't fill in the values for table cells.
+    bool isCell = isTableCell();
+    if (!isCell) {
+        initMaxMarginValues();
+
+        m_topMarginQuirk = style()->marginTop().quirk();
+        m_bottomMarginQuirk = style()->marginBottom().quirk();
+
+        if (element() && element()->hasTagName(formTag) && element()->isMalformed())
+            // See if this form is malformed (i.e., unclosed). If so, don't give the form
+            // a bottom margin.
+            setMaxBottomMargins(0, 0);
+    }
+
+    // For overflow:scroll blocks, ensure we have both scrollbars in place always.
+    if (scrollsOverflow()) {
+        if (style()->overflowX() == OSCROLL)
+            m_layer->setHasHorizontalScrollbar(true);
+        if (style()->overflowY() == OSCROLL)
+            m_layer->setHasVerticalScrollbar(true);
+    }
+
+    int repaintTop = 0;
+    int repaintBottom = 0;
+    int maxFloatBottom = 0;
+    if (childrenInline())
+        layoutInlineChildren(relayoutChildren, repaintTop, repaintBottom);
+    else
+        layoutBlockChildren(relayoutChildren, maxFloatBottom);
+
+    // Expand our intrinsic height to encompass floats.
+    int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight();
+    if (floatBottom() > (m_height - toAdd) && (isInlineBlockOrInlineTable() || isFloatingOrPositioned() || hasOverflowClip() ||
+                                    (parent() && parent()->isFlexibleBox() || m_hasColumns)))
+        m_height = floatBottom() + toAdd;
+    
+    // Now lay out our columns within this intrinsic height, since they can slightly affect the intrinsic height as
+    // we adjust for clean column breaks.
+    int singleColumnBottom = layoutColumns();
+
+    // Calculate our new height.
+    int oldHeight = m_height;
+    calcHeight();
+    if (oldHeight != m_height) {
+        if (oldHeight > m_height && maxFloatBottom > m_height && !childrenInline()) {
+            // One of our children's floats may have become an overhanging float for us. We need to look for it.
+            for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
+                if (child->isBlockFlow() && !child->isFloatingOrPositioned()) {
+                    RenderBlock* block = static_cast<RenderBlock*>(child);
+                    if (block->floatBottom() + block->yPos() > m_height)
+                        addOverhangingFloats(block, -block->xPos(), -block->yPos(), false);
+                }
+            }
+        }
+        // We have to rebalance columns to the new height.
+        layoutColumns(singleColumnBottom);
+
+        // If the block got expanded in size, then increase our overflowheight to match.
+        if (m_overflowHeight > m_height)
+            m_overflowHeight -= toAdd;
+        if (m_overflowHeight < m_height)
+            m_overflowHeight = m_height;
+    }
+    if (previousHeight != m_height)
+        relayoutChildren = true;
+
+    // Some classes of objects (floats and fieldsets with no specified heights and table cells) expand to encompass
+    // overhanging floats.
+    if (hasOverhangingFloats() && expandsToEncloseOverhangingFloats()) {
+        m_height = floatBottom();
+        m_height += borderBottom() + paddingBottom();
+    }
+
+    if ((isCell || isInline() || isFloatingOrPositioned() || isRoot()) && !hasOverflowClip() && !hasControlClip())
+        addVisualOverflow(floatRect());
+
+    layoutPositionedObjects(relayoutChildren || isRoot());
+
+    positionListMarker();
+
+    // Always ensure our overflow width/height are at least as large as our width/height.
+    m_overflowWidth = max(m_overflowWidth, m_width);
+    m_overflowHeight = max(m_overflowHeight, m_height);
+
+    if (!hasOverflowClip()) {
+        if (ShadowData* boxShadow = style()->boxShadow()) {
+            m_overflowLeft = min(m_overflowLeft, boxShadow->x - boxShadow->blur);
+            m_overflowWidth = max(m_overflowWidth, m_width + boxShadow->x + boxShadow->blur);
+            m_overflowTop = min(m_overflowTop, boxShadow->y - boxShadow->blur);
+            m_overflowHeight = max(m_overflowHeight, m_height + boxShadow->y + boxShadow->blur);
+        }
+    }
+
+    if (!hadColumns)
+        view()->popLayoutState();
+    else
+        view()->enableLayoutState();
+
+    // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if
+    // we overflow or not.
+    if (hasOverflowClip())
+        m_layer->updateScrollInfoAfterLayout();
+
+    // Repaint with our new bounds if they are different from our old bounds.
+    bool didFullRepaint = false;
+    if (checkForRepaint)
+        didFullRepaint = repaintAfterLayoutIfNeeded(oldBounds, oldOutlineBox);
+    if (!didFullRepaint && repaintTop != repaintBottom && (style()->visibility() == VISIBLE || enclosingLayer()->hasVisibleContent())) {
+        IntRect repaintRect(m_overflowLeft, repaintTop, m_overflowWidth - m_overflowLeft, repaintBottom - repaintTop);
+
+        // FIXME: Deal with multiple column repainting.  We have to split the repaint
+        // rect up into multiple rects if it spans columns.
+
+        repaintRect.inflate(maximalOutlineSize(PaintPhaseOutline));
+        
+        if (hasOverflowClip()) {
+            // Adjust repaint rect for scroll offset
+            int x = repaintRect.x();
+            int y = repaintRect.y();
+            layer()->subtractScrollOffset(x, y);
+            repaintRect.setX(x);
+            repaintRect.setY(y);
+
+            // Don't allow this rect to spill out of our overflow box.
+            repaintRect.intersect(IntRect(0, 0, m_width, m_height));
+        }
+    
+        RenderView* v = view();
+        // Make sure the rect is still non-empty after intersecting for overflow above
+        if (!repaintRect.isEmpty() && v && v->frameView())
+            v->frameView()->addRepaintInfo(this, repaintRect); // We need to do a partial repaint of our content.
+    }
+    setNeedsLayout(false);
+}
+
+void RenderBlock::adjustPositionedBlock(RenderObject* child, const MarginInfo& marginInfo)
+{
+    if (child->hasStaticX()) {
+        if (style()->direction() == LTR)
+            child->setStaticX(borderLeft() + paddingLeft());
+        else
+            child->setStaticX(borderRight() + paddingRight());
+    }
+
+    if (child->hasStaticY()) {
+        int y = m_height;
+        if (!marginInfo.canCollapseWithTop()) {
+            child->calcVerticalMargins();
+            int marginTop = child->marginTop();
+            int collapsedTopPos = marginInfo.posMargin();
+            int collapsedTopNeg = marginInfo.negMargin();
+            if (marginTop > 0) {
+                if (marginTop > collapsedTopPos)
+                    collapsedTopPos = marginTop;
+            } else {
+                if (-marginTop > collapsedTopNeg)
+                    collapsedTopNeg = -marginTop;
+            }
+            y += (collapsedTopPos - collapsedTopNeg) - marginTop;
+        }
+        child->setStaticY(y);
+    }
+}
+
+void RenderBlock::adjustFloatingBlock(const MarginInfo& marginInfo)
+{
+    // The float should be positioned taking into account the bottom margin
+    // of the previous flow.  We add that margin into the height, get the
+    // float positioned properly, and then subtract the margin out of the
+    // height again.  In the case of self-collapsing blocks, we always just
+    // use the top margins, since the self-collapsing block collapsed its
+    // own bottom margin into its top margin.
+    //
+    // Note also that the previous flow may collapse its margin into the top of
+    // our block.  If this is the case, then we do not add the margin in to our
+    // height when computing the position of the float.   This condition can be tested
+    // for by simply calling canCollapseWithTop.  See
+    // http://www.hixie.ch/tests/adhoc/css/box/block/margin-collapse/046.html for
+    // an example of this scenario.
+    int marginOffset = marginInfo.canCollapseWithTop() ? 0 : marginInfo.margin();
+    m_height += marginOffset;
+    positionNewFloats();
+    m_height -= marginOffset;
+}
+
+RenderObject* RenderBlock::handleSpecialChild(RenderObject* child, const MarginInfo& marginInfo, CompactInfo& compactInfo, bool& handled)
+{
+    // Handle positioned children first.
+    RenderObject* next = handlePositionedChild(child, marginInfo, handled);
+    if (handled) return next;
+    
+    // Handle floating children next.
+    next = handleFloatingChild(child, marginInfo, handled);
+    if (handled) return next;
+
+    // See if we have a compact element.  If we do, then try to tuck the compact element into the margin space of the next block.
+    next = handleCompactChild(child, compactInfo, handled);
+    if (handled) return next;
+
+    // Finally, see if we have a run-in element.
+    return handleRunInChild(child, handled);
+}
+
+
+RenderObject* RenderBlock::handlePositionedChild(RenderObject* child, const MarginInfo& marginInfo, bool& handled)
+{
+    if (child->isPositioned()) {
+        handled = true;
+        child->containingBlock()->insertPositionedObject(child);
+        adjustPositionedBlock(child, marginInfo);
+        return child->nextSibling();
+    }
+
+    return 0;
+}
+
+RenderObject* RenderBlock::handleFloatingChild(RenderObject* child, const MarginInfo& marginInfo, bool& handled)
+{
+    if (child->isFloating()) {
+        handled = true;
+        insertFloatingObject(child);
+        adjustFloatingBlock(marginInfo);
+        return child->nextSibling();
+    }
+    
+    return 0;
+}
+
+RenderObject* RenderBlock::handleCompactChild(RenderObject* child, CompactInfo& compactInfo, bool& handled)
+{
+    // FIXME: We only deal with one compact at a time.  It is unclear what should be
+    // done if multiple contiguous compacts are encountered.  For now we assume that
+    // compact A followed by another compact B should simply be treated as block A.
+    if (child->isCompact() && !compactInfo.compact() && (child->childrenInline() || child->isReplaced())) {
+        // Get the next non-positioned/non-floating RenderBlock.
+        RenderObject* next = child->nextSibling();
+        RenderObject* curr = next;
+        while (curr && curr->isFloatingOrPositioned())
+            curr = curr->nextSibling();
+        if (curr && curr->isRenderBlock() && !curr->isCompact() && !curr->isRunIn()) {
+            curr->calcWidth(); // So that horizontal margins are correct.
+                               
+            child->setInline(true); // Need to compute the margins/width for the child as though it is an inline, so that it won't try to puff up the margins to
+                                    // fill the containing block width.
+            child->calcWidth();
+            int childMargins = child->marginLeft() + child->marginRight();
+            int margin = style()->direction() == LTR ? curr->marginLeft() : curr->marginRight();
+            if (margin >= (childMargins + child->maxPrefWidth())) {
+                // The compact will fit in the margin.
+                handled = true;
+                compactInfo.set(child, curr);
+                child->setPos(0,0); // This position will be updated to reflect the compact's
+                                    // desired position and the line box for the compact will
+                                    // pick that position up.
+                
+                // Remove the child.
+                RenderObject* next = child->nextSibling();
+                removeChildNode(child);
+                
+                // Now insert the child under |curr|.
+                curr->insertChildNode(child, curr->firstChild());
+                return next;
+            }
+            else
+                child->setInline(false); // We didn't fit, so we remain a block-level element.
+        }
+    }
+    return 0;
+}
+
+void RenderBlock::insertCompactIfNeeded(RenderObject* child, CompactInfo& compactInfo)
+{
+    if (compactInfo.matches(child)) {
+        // We have a compact child to squeeze in.
+        RenderObject* compactChild = compactInfo.compact();
+        int compactXPos = borderLeft() + paddingLeft() + compactChild->marginLeft();
+        if (style()->direction() == RTL) {
+            compactChild->calcWidth(); // have to do this because of the capped maxwidth
+            compactXPos = width() - borderRight() - paddingRight() - marginRight() -
+                compactChild->width() - compactChild->marginRight();
+        }
+        compactXPos -= child->xPos(); // Put compactXPos into the child's coordinate space.
+        compactChild->setPos(compactXPos, compactChild->yPos()); // Set the x position.
+        compactInfo.clear();
+    }
+}
+
+RenderObject* RenderBlock::handleRunInChild(RenderObject* child, bool& handled)
+{
+    // See if we have a run-in element with inline children.  If the
+    // children aren't inline, then just treat the run-in as a normal
+    // block.
+    if (child->isRunIn() && (child->childrenInline() || child->isReplaced())) {
+        // Get the next non-positioned/non-floating RenderBlock.
+        RenderObject* curr = child->nextSibling();
+        while (curr && curr->isFloatingOrPositioned())
+            curr = curr->nextSibling();
+        if (curr && (curr->isRenderBlock() && curr->childrenInline() && !curr->isCompact() && !curr->isRunIn())) {
+            // The block acts like an inline, so just null out its
+            // position.
+            handled = true;
+            child->setInline(true);
+            child->setPos(0,0);
+            
+            // Remove the child.
+            RenderObject* next = child->nextSibling();
+            removeChildNode(child);
+            
+            // Now insert the child under |curr|.
+            curr->insertChildNode(child, curr->firstChild());
+            return next;
+        }
+    }
+    return 0;
+}
+
+void RenderBlock::collapseMargins(RenderObject* child, MarginInfo& marginInfo, int yPosEstimate)
+{
+    // Get our max pos and neg top margins.
+    int posTop = child->maxTopMargin(true);
+    int negTop = child->maxTopMargin(false);
+
+    // For self-collapsing blocks, collapse our bottom margins into our
+    // top to get new posTop and negTop values.
+    if (child->isSelfCollapsingBlock()) {
+        posTop = max(posTop, child->maxBottomMargin(true));
+        negTop = max(negTop, child->maxBottomMargin(false));
+    }
+    
+    // See if the top margin is quirky. We only care if this child has
+    // margins that will collapse with us.
+    bool topQuirk = child->isTopMarginQuirk() || style()->marginTopCollapse() == MDISCARD;
+
+    if (marginInfo.canCollapseWithTop()) {
+        // This child is collapsing with the top of the
+        // block.  If it has larger margin values, then we need to update
+        // our own maximal values.
+        if (!style()->htmlHacks() || !marginInfo.quirkContainer() || !topQuirk)
+            setMaxTopMargins(max(posTop, maxTopPosMargin()), max(negTop, maxTopNegMargin()));
+
+        // The minute any of the margins involved isn't a quirk, don't
+        // collapse it away, even if the margin is smaller (www.webreference.com
+        // has an example of this, a <dt> with 0.8em author-specified inside
+        // a <dl> inside a <td>.
+        if (!marginInfo.determinedTopQuirk() && !topQuirk && (posTop-negTop)) {
+            m_topMarginQuirk = false;
+            marginInfo.setDeterminedTopQuirk(true);
+        }
+
+        if (!marginInfo.determinedTopQuirk() && topQuirk && marginTop() == 0)
+            // We have no top margin and our top child has a quirky margin.
+            // We will pick up this quirky margin and pass it through.
+            // This deals with the <td><div><p> case.
+            // Don't do this for a block that split two inlines though.  You do
+            // still apply margins in this case.
+            m_topMarginQuirk = true;
+    }
+
+    if (marginInfo.quirkContainer() && marginInfo.atTopOfBlock() && (posTop - negTop))
+        marginInfo.setTopQuirk(topQuirk);
+
+    int ypos = m_height;
+    if (child->isSelfCollapsingBlock()) {
+        // This child has no height.  We need to compute our
+        // position before we collapse the child's margins together,
+        // so that we can get an accurate position for the zero-height block.
+        int collapsedTopPos = max(marginInfo.posMargin(), child->maxTopMargin(true));
+        int collapsedTopNeg = max(marginInfo.negMargin(), child->maxTopMargin(false));
+        marginInfo.setMargin(collapsedTopPos, collapsedTopNeg);
+        
+        // Now collapse the child's margins together, which means examining our
+        // bottom margin values as well. 
+        marginInfo.setPosMarginIfLarger(child->maxBottomMargin(true));
+        marginInfo.setNegMarginIfLarger(child->maxBottomMargin(false));
+
+        if (!marginInfo.canCollapseWithTop())
+            // We need to make sure that the position of the self-collapsing block
+            // is correct, since it could have overflowing content
+            // that needs to be positioned correctly (e.g., a block that
+            // had a specified height of 0 but that actually had subcontent).
+            ypos = m_height + collapsedTopPos - collapsedTopNeg;
+    }
+    else {
+        if (child->style()->marginTopCollapse() == MSEPARATE) {
+            m_height += marginInfo.margin() + child->marginTop();
+            ypos = m_height;
+        }
+        else if (!marginInfo.atTopOfBlock() ||
+            (!marginInfo.canCollapseTopWithChildren()
+             && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.topQuirk()))) {
+            // We're collapsing with a previous sibling's margins and not
+            // with the top of the block.
+            m_height += max(marginInfo.posMargin(), posTop) - max(marginInfo.negMargin(), negTop);
+            ypos = m_height;
+        }
+
+        marginInfo.setPosMargin(child->maxBottomMargin(true));
+        marginInfo.setNegMargin(child->maxBottomMargin(false));
+
+        if (marginInfo.margin())
+            marginInfo.setBottomQuirk(child->isBottomMarginQuirk() || style()->marginBottomCollapse() == MDISCARD);
+
+        marginInfo.setSelfCollapsingBlockClearedFloat(false);
+    }
+
+    view()->addLayoutDelta(IntSize(0, yPosEstimate - ypos));
+    child->setPos(child->xPos(), ypos);
+    if (ypos != yPosEstimate) {
+        if (child->shrinkToAvoidFloats())
+            // The child's width depends on the line width.
+            // When the child shifts to clear an item, its width can
+            // change (because it has more available line width).
+            // So go ahead and mark the item as dirty.
+            child->setChildNeedsLayout(true, false);
+
+        if (!child->avoidsFloats() && child->containsFloats())
+            child->markAllDescendantsWithFloatsForLayout();
+
+        // Our guess was wrong. Make the child lay itself out again.
+        child->layoutIfNeeded();
+    }
+}
+
+void RenderBlock::clearFloatsIfNeeded(RenderObject* child, MarginInfo& marginInfo, int oldTopPosMargin, int oldTopNegMargin)
+{
+    int heightIncrease = getClearDelta(child);
+    if (heightIncrease) {
+        // The child needs to be lowered.  Move the child so that it just clears the float.
+        view()->addLayoutDelta(IntSize(0, -heightIncrease));
+        child->setPos(child->xPos(), child->yPos() + heightIncrease);
+
+        if (child->isSelfCollapsingBlock()) {
+            // For self-collapsing blocks that clear, they can still collapse their
+            // margins with following siblings.  Reset the current margins to represent
+            // the self-collapsing block's margins only.
+            marginInfo.setPosMargin(max(child->maxTopMargin(true), child->maxBottomMargin(true)));
+            marginInfo.setNegMargin(max(child->maxTopMargin(false), child->maxBottomMargin(false)));
+            
+            // Adjust our height such that we are ready to be collapsed with subsequent siblings.
+            m_height = child->yPos() - max(0, marginInfo.margin());
+            
+            // Set a flag that we cleared a float so that we know both to increase the height of the block
+            // to compensate for the clear and to avoid collapsing our margins with the parent block's
+            // bottom margin.
+            marginInfo.setSelfCollapsingBlockClearedFloat(true);
+        } else
+            // Increase our height by the amount we had to clear.
+            m_height += heightIncrease;
+        
+        if (marginInfo.canCollapseWithTop()) {
+            // We can no longer collapse with the top of the block since a clear
+            // occurred.  The empty blocks collapse into the cleared block.
+            // FIXME: This isn't quite correct.  Need clarification for what to do
+            // if the height the cleared block is offset by is smaller than the
+            // margins involved.
+            setMaxTopMargins(oldTopPosMargin, oldTopNegMargin);
+            marginInfo.setAtTopOfBlock(false);
+        }
+
+        // If our value of clear caused us to be repositioned vertically to be
+        // underneath a float, we might have to do another layout to take into account
+        // the extra space we now have available.
+        if (child->shrinkToAvoidFloats())
+            // The child's width depends on the line width.
+            // When the child shifts to clear an item, its width can
+            // change (because it has more available line width).
+            // So go ahead and mark the item as dirty.
+            child->setChildNeedsLayout(true, false);
+        if (!child->avoidsFloats() && child->containsFloats())
+            child->markAllDescendantsWithFloatsForLayout();
+        child->layoutIfNeeded();
+    }
+}
+
+int RenderBlock::estimateVerticalPosition(RenderObject* child, const MarginInfo& marginInfo)
+{
+    // FIXME: We need to eliminate the estimation of vertical position, because when it's wrong we sometimes trigger a pathological
+    // relayout if there are intruding floats.
+    int yPosEstimate = m_height;
+    if (!marginInfo.canCollapseWithTop()) {
+        int childMarginTop = child->selfNeedsLayout() ? child->marginTop() : child->collapsedMarginTop();
+        yPosEstimate += max(marginInfo.margin(), childMarginTop);
+    }
+    return yPosEstimate;
+}
+
+void RenderBlock::determineHorizontalPosition(RenderObject* child)
+{
+    if (style()->direction() == LTR) {
+        int xPos = borderLeft() + paddingLeft();
+        
+        // Add in our left margin.
+        int chPos = xPos + child->marginLeft();
+        
+        // Some objects (e.g., tables, horizontal rules, overflow:auto blocks) avoid floats.  They need
+        // to shift over as necessary to dodge any floats that might get in the way.
+        if (child->avoidsFloats()) {
+            int leftOff = leftOffset(m_height);
+            if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginLeft().type() != Auto) {
+                if (child->marginLeft() < 0)
+                    leftOff += child->marginLeft();
+                chPos = max(chPos, leftOff); // Let the float sit in the child's margin if it can fit.
+            }
+            else if (leftOff != xPos) {
+                // The object is shifting right. The object might be centered, so we need to
+                // recalculate our horizontal margins. Note that the containing block content
+                // width computation will take into account the delta between |leftOff| and |xPos|
+                // so that we can just pass the content width in directly to the |calcHorizontalMargins|
+                // function.
+                static_cast<RenderBox*>(child)->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->yPos()));
+                chPos = leftOff + child->marginLeft();
+            }
+        }
+        view()->addLayoutDelta(IntSize(child->xPos() - chPos, 0));
+        child->setPos(chPos, child->yPos());
+    } else {
+        int xPos = m_width - borderRight() - paddingRight() - verticalScrollbarWidth();
+        int chPos = xPos - (child->width() + child->marginRight());
+        if (child->avoidsFloats()) {
+            int rightOff = rightOffset(m_height);
+            if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginRight().type() != Auto) {
+                if (child->marginRight() < 0)
+                    rightOff -= child->marginRight();
+                chPos = min(chPos, rightOff - child->width()); // Let the float sit in the child's margin if it can fit.
+            } else if (rightOff != xPos) {
+                // The object is shifting left. The object might be centered, so we need to
+                // recalculate our horizontal margins. Note that the containing block content
+                // width computation will take into account the delta between |rightOff| and |xPos|
+                // so that we can just pass the content width in directly to the |calcHorizontalMargins|
+                // function.
+                static_cast<RenderBox*>(child)->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->yPos()));
+                chPos = rightOff - child->marginRight() - child->width();
+            }
+        }
+        view()->addLayoutDelta(IntSize(child->xPos() - chPos, 0));
+        child->setPos(chPos, child->yPos());
+    }
+}
+
+void RenderBlock::setCollapsedBottomMargin(const MarginInfo& marginInfo)
+{
+    if (marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()) {
+        // Update our max pos/neg bottom margins, since we collapsed our bottom margins
+        // with our children.
+        setMaxBottomMargins(max(maxBottomPosMargin(), marginInfo.posMargin()), max(maxBottomNegMargin(), marginInfo.negMargin()));
+
+        if (!marginInfo.bottomQuirk())
+            m_bottomMarginQuirk = false;
+
+        if (marginInfo.bottomQuirk() && marginBottom() == 0)
+            // We have no bottom margin and our last child has a quirky margin.
+            // We will pick up this quirky margin and pass it through.
+            // This deals with the <td><div><p> case.
+            m_bottomMarginQuirk = true;
+    }
+}
+
+void RenderBlock::handleBottomOfBlock(int top, int bottom, MarginInfo& marginInfo)
+{
+    // If our last flow was a self-collapsing block that cleared a float, then we don't
+    // collapse it with the bottom of the block.
+    if (!marginInfo.selfCollapsingBlockClearedFloat())
+        marginInfo.setAtBottomOfBlock(true);
+    else {
+        // We have to special case the negative margin situation (where the collapsed
+        // margin of the self-collapsing block is negative), since there's no need
+        // to make an adjustment in that case.
+        if (marginInfo.margin() < 0)
+            marginInfo.clearMargin();
+    }
+
+    // If we can't collapse with children then go ahead and add in the bottom margin.
+    if (!marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()
+        && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.bottomQuirk()))
+        m_height += marginInfo.margin();
+        
+    // Now add in our bottom border/padding.
+    m_height += bottom;
+
+    // Negative margins can cause our height to shrink below our minimal height (border/padding).
+    // If this happens, ensure that the computed height is increased to the minimal height.
+    m_height = max(m_height, top + bottom);
+
+    // Always make sure our overflow height is at least our height.
+    m_overflowHeight = max(m_height, m_overflowHeight);
+
+    // Update our bottom collapsed margin info.
+    setCollapsedBottomMargin(marginInfo);
+}
+
+void RenderBlock::layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom)
+{
+    int top = borderTop() + paddingTop();
+    int bottom = borderBottom() + paddingBottom() + horizontalScrollbarHeight();
+
+    m_height = m_overflowHeight = top;
+
+    // The margin struct caches all our current margin collapsing state.  The compact struct caches state when we encounter compacts,
+    MarginInfo marginInfo(this, top, bottom);
+    CompactInfo compactInfo;
+
+    // Fieldsets need to find their legend and position it inside the border of the object.
+    // The legend then gets skipped during normal layout.
+    RenderObject* legend = layoutLegend(relayoutChildren);
+
+    int previousFloatBottom = 0;
+    maxFloatBottom = 0;
+
+    RenderObject* child = firstChild();
+    while (child) {
+        if (legend == child) {
+            child = child->nextSibling();
+            continue; // Skip the legend, since it has already been positioned up in the fieldset's border.
+        }
+
+        int oldTopPosMargin = maxTopPosMargin();
+        int oldTopNegMargin = maxTopNegMargin();
+
+        // Make sure we layout children if they need it.
+        // FIXME: Technically percentage height objects only need a relayout if their percentage isn't going to be turned into
+        // an auto value.  Add a method to determine this, so that we can avoid the relayout.
+        if (relayoutChildren || (child->style()->height().isPercent() || child->style()->minHeight().isPercent() || child->style()->maxHeight().isPercent()))
+            child->setChildNeedsLayout(true, false);
+
+        // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths.
+        if (relayoutChildren && (child->style()->paddingLeft().isPercent() || child->style()->paddingRight().isPercent()))
+            child->setPrefWidthsDirty(true, false);
+
+        // Handle the four types of special elements first.  These include positioned content, floating content, compacts and
+        // run-ins.  When we encounter these four types of objects, we don't actually lay them out as normal flow blocks.
+        bool handled = false;
+        RenderObject* next = handleSpecialChild(child, marginInfo, compactInfo, handled);
+        if (handled) { child = next; continue; }
+
+        // The child is a normal flow object.  Compute its vertical margins now.
+        child->calcVerticalMargins();
+
+        // Do not allow a collapse if the margin top collapse style is set to SEPARATE.
+        if (child->style()->marginTopCollapse() == MSEPARATE) {
+            marginInfo.setAtTopOfBlock(false);
+            marginInfo.clearMargin();
+        }
+
+        // Try to guess our correct y position.  In most cases this guess will
+        // be correct.  Only if we're wrong (when we compute the real y position)
+        // will we have to potentially relayout.
+        int yPosEstimate = estimateVerticalPosition(child, marginInfo);
+
+        // Cache our old rect so that we can dirty the proper repaint rects if the child moves.
+        IntRect oldRect(child->xPos(), child->yPos() , child->width(), child->height());
+          
+        // Go ahead and position the child as though it didn't collapse with the top.
+        view()->addLayoutDelta(IntSize(0, child->yPos() - yPosEstimate));
+        child->setPos(child->xPos(), yPosEstimate);
+
+        bool markDescendantsWithFloats = false;
+        if (yPosEstimate != oldRect.y() && !child->avoidsFloats() && child->containsFloats())
+            markDescendantsWithFloats = true;
+        else if (!child->avoidsFloats() || child->shrinkToAvoidFloats()) {
+            // If an element might be affected by the presence of floats, then always mark it for
+            // layout.
+            int fb = max(previousFloatBottom, floatBottom());
+            if (fb > m_height || fb > yPosEstimate)
+                markDescendantsWithFloats = true;
+        }
+
+        if (markDescendantsWithFloats)
+            child->markAllDescendantsWithFloatsForLayout();
+
+        if (child->isRenderBlock())
+            previousFloatBottom = max(previousFloatBottom, oldRect.y() + static_cast<RenderBlock*>(child)->floatBottom());
+
+        bool childNeededLayout = child->needsLayout();
+        if (childNeededLayout)
+            child->layout();
+
+        // Now determine the correct ypos based off examination of collapsing margin
+        // values.
+        collapseMargins(child, marginInfo, yPosEstimate);
+        int postCollapseChildY = child->yPos();
+
+        // Now check for clear.
+        clearFloatsIfNeeded(child, marginInfo, oldTopPosMargin, oldTopNegMargin);
+
+        // We are no longer at the top of the block if we encounter a non-empty child.  
+        // This has to be done after checking for clear, so that margins can be reset if a clear occurred.
+        if (marginInfo.atTopOfBlock() && !child->isSelfCollapsingBlock())
+            marginInfo.setAtTopOfBlock(false);
+
+        // Now place the child in the correct horizontal position
+        determineHorizontalPosition(child);
+
+        // Update our height now that the child has been placed in the correct position.
+        m_height += child->height();
+        if (child->style()->marginBottomCollapse() == MSEPARATE) {
+            m_height += child->marginBottom();
+            marginInfo.clearMargin();
+        }
+        // If the child has overhanging floats that intrude into following siblings (or possibly out
+        // of this block), then the parent gets notified of the floats now.
+        maxFloatBottom = max(maxFloatBottom, addOverhangingFloats(static_cast<RenderBlock *>(child), -child->xPos(), -child->yPos(), !childNeededLayout));
+
+        // Update our overflow in case the child spills out the block.
+        m_overflowTop = min(m_overflowTop, child->yPos() + child->overflowTop(false));
+        m_overflowHeight = max(m_overflowHeight, m_height + child->overflowHeight(false) - child->height());
+        m_overflowWidth = max(child->xPos() + child->overflowWidth(false), m_overflowWidth);
+        m_overflowLeft = min(child->xPos() + child->overflowLeft(false), m_overflowLeft);
+        
+        // Insert our compact into the block margin if we have one.
+        insertCompactIfNeeded(child, compactInfo);
+
+        view()->addLayoutDelta(IntSize(child->xPos() - oldRect.x(), child->yPos() - oldRect.y()));
+
+        // If the child moved, we have to repaint it as well as any floating/positioned
+        // descendants.  An exception is if we need a layout.  In this case, we know we're going to
+        // repaint ourselves (and the child) anyway.
+        if (!selfNeedsLayout() && child->checkForRepaintDuringLayout()) {
+            int finalChildX = child->xPos();
+            int finalChildY = child->yPos();
+            if (finalChildX != oldRect.x() || finalChildY != oldRect.y())
+                child->repaintDuringLayoutIfMoved(oldRect);
+            else if (finalChildY != yPosEstimate || finalChildY != postCollapseChildY) {
+                // The child invalidated itself during layout at an intermediate position,
+                // but not at its final position. Take care of it now.
+                child->repaint();
+                child->repaintOverhangingFloats();
+            }
+        }
+
+        child = child->nextSibling();
+    }
+
+    // Now do the handling of the bottom of the block, adding in our bottom border/padding and
+    // determining the correct collapsed bottom margin information.
+    handleBottomOfBlock(top, bottom, marginInfo);
+}
+
+bool RenderBlock::layoutOnlyPositionedObjects()
+{
+    if (!posChildNeedsLayout() || normalChildNeedsLayout() || selfNeedsLayout())
+        return false;
+
+    if (!m_hasColumns)
+        view()->pushLayoutState(this, IntSize(xPos(), yPos()));
+    else
+        view()->disableLayoutState();
+
+    // All we have to is lay out our positioned objects.
+    layoutPositionedObjects(false);
+
+    if (!m_hasColumns)
+        view()->popLayoutState();
+    else
+        view()->enableLayoutState();
+
+    if (hasOverflowClip())
+        m_layer->updateScrollInfoAfterLayout();
+
+    setNeedsLayout(false);
+    return true;
+}
+
+void RenderBlock::layoutPositionedObjects(bool relayoutChildren)
+{
+    if (m_positionedObjects) {
+        RenderObject* r;
+        Iterator end = m_positionedObjects->end();
+        for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {
+            r = *it;
+            // When a non-positioned block element moves, it may have positioned children that are implicitly positioned relative to the
+            // non-positioned block.  Rather than trying to detect all of these movement cases, we just always lay out positioned
+            // objects that are positioned implicitly like this.  Such objects are rare, and so in typical DHTML menu usage (where everything is
+            // positioned explicitly) this should not incur a performance penalty.
+            if (relayoutChildren || (r->hasStaticY() && r->parent() != this && r->parent()->isBlockFlow()))
+                r->setChildNeedsLayout(true, false);
+                
+            // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths.
+            if (relayoutChildren && (r->style()->paddingLeft().isPercent() || r->style()->paddingRight().isPercent()))
+                r->setPrefWidthsDirty(true, false);
+                    
+            r->layoutIfNeeded();
+        }
+    }
+}
+
+void RenderBlock::markPositionedObjectsForLayout()
+{
+    if (m_positionedObjects) {
+        RenderObject* r;
+        Iterator end = m_positionedObjects->end();
+        for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {
+            r = *it;
+            r->setChildNeedsLayout(true);
+        }
+    }
+}
+
+void RenderBlock::repaintOverhangingFloats(bool paintAllDescendants)
+{
+    // Repaint any overhanging floats (if we know we're the one to paint them).
+    if (hasOverhangingFloats()) {
+        // We think that we must be in a bad state if m_floatingObjects is nil at this point, so 
+        // we assert on Debug builds and nil-check Release builds.
+        ASSERT(m_floatingObjects);
+        if (!m_floatingObjects)
+            return;
+        
+        FloatingObject* r;
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+
+        // FIXME: Avoid disabling LayoutState. At the very least, don't disable it for floats originating
+        // in this block. Better yet would be to push extra state for the containers of other floats.
+        view()->disableLayoutState();
+        for ( ; (r = it.current()); ++it) {
+            // Only repaint the object if it is overhanging, is not in its own layer, and
+            // is our responsibility to paint (noPaint isn't set). When paintAllDescendants is true, the latter
+            // condition is replaced with being a descendant of us.
+            if (r->endY > m_height && (paintAllDescendants && r->node->isDescendantOf(this) || !r->noPaint) && !r->node->hasLayer()) {                
+                r->node->repaint();
+                r->node->repaintOverhangingFloats();
+            }
+        }
+        view()->enableLayoutState();
+    }
+}
+
+void RenderBlock::paint(PaintInfo& paintInfo, int tx, int ty)
+{
+    tx += m_x;
+    ty += m_y;
+    
+    PaintPhase phase = paintInfo.phase;
+
+    // Check if we need to do anything at all.
+    // FIXME: Could eliminate the isRoot() check if we fix background painting so that the RenderView
+    // paints the root's background.
+    if (!isInlineFlow() && !isRoot()) {
+        IntRect overflowBox = overflowRect(false);
+        overflowBox.inflate(maximalOutlineSize(paintInfo.phase));
+        overflowBox.move(tx, ty);
+        if (!overflowBox.intersects(paintInfo.rect))
+            return;
+    }
+
+    bool useControlClip = phase != PaintPhaseBlockBackground && phase != PaintPhaseSelfOutline && hasControlClip();
+
+    // Push a clip.
+    if (useControlClip) {
+        if (phase == PaintPhaseOutline)
+            paintInfo.phase = PaintPhaseChildOutlines;
+        else if (phase == PaintPhaseChildBlockBackground) {
+            paintInfo.phase = PaintPhaseBlockBackground;
+            paintObject(paintInfo, tx, ty);
+            paintInfo.phase = PaintPhaseChildBlockBackgrounds;
+        }
+        IntRect clipRect(controlClipRect(tx, ty));
+        if (clipRect.isEmpty())
+            return;
+        paintInfo.context->save();
+        paintInfo.context->clip(clipRect);
+    }
+
+    paintObject(paintInfo, tx, ty);
+    
+    // Pop the clip.
+    if (useControlClip) {
+        paintInfo.context->restore();
+        if (phase == PaintPhaseOutline) {
+            paintInfo.phase = PaintPhaseSelfOutline;
+            paintObject(paintInfo, tx, ty);
+            paintInfo.phase = phase;
+        } else if (phase == PaintPhaseChildBlockBackground)
+            paintInfo.phase = phase;
+    }
+}
+
+void RenderBlock::paintColumns(PaintInfo& paintInfo, int tx, int ty, bool paintingFloats)
+{
+    // We need to do multiple passes, breaking up our child painting into strips.
+    GraphicsContext* context = paintInfo.context;
+    int currXOffset = 0;
+    int currYOffset = 0;
+    int ruleAdd = borderLeft() + paddingLeft();
+    int ruleX = 0;
+    int colGap = columnGap();
+    const Color& ruleColor = style()->columnRuleColor();
+    bool ruleTransparent = style()->columnRuleIsTransparent();
+    EBorderStyle ruleStyle = style()->columnRuleStyle();
+    int ruleWidth = style()->columnRuleWidth();
+    bool renderRule = !paintingFloats && ruleStyle > BHIDDEN && !ruleTransparent && ruleWidth <= colGap;
+    Vector<IntRect>* colRects = columnRects();
+    unsigned colCount = colRects->size();
+    for (unsigned i = 0; i < colCount; i++) {
+        // For each rect, we clip to the rect, and then we adjust our coords.
+        IntRect colRect = colRects->at(i);
+        colRect.move(tx, ty);
+        context->save();
+        
+        // Each strip pushes a clip, since column boxes are specified as being
+        // like overflow:hidden.
+        context->clip(colRect);
+        
+        // Adjust tx and ty to change where we paint.
+        PaintInfo info(paintInfo);
+        info.rect.intersect(colRect);
+        
+        // Adjust our x and y when painting.
+        int finalX = tx + currXOffset;
+        int finalY = ty + currYOffset;
+        if (paintingFloats)
+            paintFloats(info, finalX, finalY, paintInfo.phase == PaintPhaseSelection);
+        else
+            paintContents(info, finalX, finalY);
+
+        // Move to the next position.
+        if (style()->direction() == LTR) {
+            ruleX += colRect.width() + colGap / 2;
+            currXOffset += colRect.width() + colGap;
+        } else {
+            ruleX -= (colRect.width() + colGap / 2);
+            currXOffset -= (colRect.width() + colGap);
+        }
+
+        currYOffset -= colRect.height();
+        
+        context->restore();
+        
+        // Now paint the column rule.
+        if (renderRule && paintInfo.phase == PaintPhaseForeground && i < colCount - 1) {
+            int ruleStart = ruleX - ruleWidth / 2 + ruleAdd;
+            int ruleEnd = ruleStart + ruleWidth;
+            drawBorder(paintInfo.context, tx + ruleStart, ty + borderTop() + paddingTop(), tx + ruleEnd, ty + borderTop() + paddingTop() + contentHeight(),
+                       style()->direction() == LTR ? BSLeft : BSRight, ruleColor, style()->color(), ruleStyle, 0, 0);
+        }
+        
+        ruleX = currXOffset;
+    }
+}
+
+void RenderBlock::paintContents(PaintInfo& paintInfo, int tx, int ty)
+{
+    // Avoid painting descendants of the root element when stylesheets haven't loaded.  This eliminates FOUC.
+    // It's ok not to draw, because later on, when all the stylesheets do load, updateStyleSelector on the Document
+    // will do a full repaint().
+    if (document()->didLayoutWithPendingStylesheets() && !isRenderView())
+        return;
+
+    if (childrenInline())
+        paintLines(paintInfo, tx, ty);
+    else
+        paintChildren(paintInfo, tx, ty);
+}
+
+void RenderBlock::paintChildren(PaintInfo& paintInfo, int tx, int ty)
+{
+    PaintPhase newPhase = (paintInfo.phase == PaintPhaseChildOutlines) ? PaintPhaseOutline : paintInfo.phase;
+    newPhase = (newPhase == PaintPhaseChildBlockBackgrounds) ? PaintPhaseChildBlockBackground : newPhase;
+    
+    // We don't paint our own background, but we do let the kids paint their backgrounds.
+    PaintInfo info(paintInfo);
+    info.phase = newPhase;
+    info.paintingRoot = paintingRootForChildren(paintInfo);
+    bool isPrinting = document()->printing();
+
+    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {        
+        // Check for page-break-before: always, and if it's set, break and bail.
+        if (isPrinting && !childrenInline() && child->style()->pageBreakBefore() == PBALWAYS &&
+            inRootBlockContext() && (ty + child->yPos()) > paintInfo.rect.y() && 
+            (ty + child->yPos()) < paintInfo.rect.bottom()) {
+            view()->setBestTruncatedAt(ty + child->yPos(), this, true);
+            return;
+        }
+
+        if (!child->hasLayer() && !child->isFloating())
+            child->paint(info, tx, ty);
+
+        // Check for page-break-after: always, and if it's set, break and bail.
+        if (isPrinting && !childrenInline() && child->style()->pageBreakAfter() == PBALWAYS && 
+            inRootBlockContext() && (ty + child->yPos() + child->height()) > paintInfo.rect.y() && 
+            (ty + child->yPos() + child->height()) < paintInfo.rect.bottom()) {
+            view()->setBestTruncatedAt(ty + child->yPos() + child->height() + max(0, child->collapsedMarginBottom()), this, true);
+            return;
+        }
+    }
+}
+
+void RenderBlock::paintCaret(PaintInfo& paintInfo, CaretType type)
+{
+    SelectionController* selectionController = type == CursorCaret ? document()->frame()->selectionController() : document()->frame()->dragCaretController();
+    Node* caretNode = selectionController->start().node();
+    RenderObject* renderer = caretNode ? caretNode->renderer() : 0;
+    if (!renderer)
+        return;
+    // if caretNode is a block and caret is inside it then caret should be painted by that block
+    bool cursorInsideBlockCaretNode = renderer->isBlockFlow() && selectionController->isInsideNode();
+    if ((cursorInsideBlockCaretNode ? renderer : renderer->containingBlock()) == this && selectionController->isContentEditable()) {
+        if (type == CursorCaret)
+            document()->frame()->paintCaret(paintInfo.context, paintInfo.rect);
+        else
+            document()->frame()->paintDragCaret(paintInfo.context, paintInfo.rect);
+    }
+}
+
+void RenderBlock::paintObject(PaintInfo& paintInfo, int tx, int ty)
+{
+    PaintPhase paintPhase = paintInfo.phase;
+
+    // If we're a repositioned run-in or a compact, don't paint background/borders.
+    bool inlineFlow = isInlineFlow();
+
+    // 1. paint background, borders etc
+    if (!inlineFlow &&
+        (paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) &&
+        hasBoxDecorations() && style()->visibility() == VISIBLE) {
+        paintBoxDecorations(paintInfo, tx, ty);
+    }
+
+    // We're done.  We don't bother painting any children.
+    if (paintPhase == PaintPhaseBlockBackground)
+        return;
+
+    // Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).s
+    int scrolledX = tx;
+    int scrolledY = ty;
+    if (hasOverflowClip())
+        m_layer->subtractScrollOffset(scrolledX, scrolledY);
+
+    // 2. paint contents
+    if (paintPhase != PaintPhaseSelfOutline) {
+        if (m_hasColumns)
+            paintColumns(paintInfo, scrolledX, scrolledY);
+        else
+            paintContents(paintInfo, scrolledX, scrolledY);
+    }
+
+    // 3. paint selection
+    // FIXME: Make this work with multi column layouts.  For now don't fill gaps.
+    bool isPrinting = document()->printing();
+    if (!inlineFlow && !isPrinting && !m_hasColumns)
+        paintSelection(paintInfo, scrolledX, scrolledY); // Fill in gaps in selection on lines and between blocks.
+
+    // 4. paint floats.
+    if (!inlineFlow && (paintPhase == PaintPhaseFloat || paintPhase == PaintPhaseSelection)) {
+        if (m_hasColumns)
+            paintColumns(paintInfo, scrolledX, scrolledY, true);
+        else
+            paintFloats(paintInfo, scrolledX, scrolledY, paintPhase == PaintPhaseSelection);
+    }
+
+    // 5. paint outline.
+    if (!inlineFlow && (paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseSelfOutline) && hasOutline() && style()->visibility() == VISIBLE)
+        RenderObject::paintOutline(paintInfo.context, tx, ty, width(), height(), style());
+
+    // 6. paint continuation outlines.
+    if (!inlineFlow && (paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseChildOutlines)) {
+        if (continuation() && continuation()->hasOutline() && continuation()->style()->visibility() == VISIBLE) {
+            RenderFlow* inlineFlow = static_cast<RenderFlow*>(continuation()->element()->renderer());
+            if (!inlineFlow->hasLayer())
+                containingBlock()->addContinuationWithOutline(inlineFlow);
+            else if (!inlineFlow->firstLineBox())
+                inlineFlow->paintOutline(paintInfo.context, tx - xPos() + inlineFlow->containingBlock()->xPos(),
+                                         ty - yPos() + inlineFlow->containingBlock()->yPos());
+        }
+        paintContinuationOutlines(paintInfo, tx, ty);
+    }
+
+    // 7. paint caret.
+    // If the caret's node's render object's containing block is this block, and the paint action is PaintPhaseForeground,
+    // then paint the caret.
+    if (!inlineFlow && paintPhase == PaintPhaseForeground) {        
+        paintCaret(paintInfo, CursorCaret);
+        paintCaret(paintInfo, DragCaret);
+    }
+}
+
+void RenderBlock::paintFloats(PaintInfo& paintInfo, int tx, int ty, bool paintSelection)
+{
+    if (!m_floatingObjects)
+        return;
+
+    FloatingObject* r;
+    DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+    for (; (r = it.current()); ++it) {
+        // Only paint the object if our noPaint flag isn't set.
+        if (!r->noPaint && !r->node->hasLayer()) {
+            PaintInfo currentPaintInfo(paintInfo);
+            currentPaintInfo.phase = paintSelection ? PaintPhaseSelection : PaintPhaseBlockBackground;
+            int currentTX = tx + r->left - r->node->xPos() + r->node->marginLeft();
+            int currentTY = ty + r->startY - r->node->yPos() + r->node->marginTop();
+            r->node->paint(currentPaintInfo, currentTX, currentTY);
+            if (!paintSelection) {
+                currentPaintInfo.phase = PaintPhaseChildBlockBackgrounds;
+                r->node->paint(currentPaintInfo, currentTX, currentTY);
+                currentPaintInfo.phase = PaintPhaseFloat;
+                r->node->paint(currentPaintInfo, currentTX, currentTY);
+                currentPaintInfo.phase = PaintPhaseForeground;
+                r->node->paint(currentPaintInfo, currentTX, currentTY);
+                currentPaintInfo.phase = PaintPhaseOutline;
+                r->node->paint(currentPaintInfo, currentTX, currentTY);
+            }
+        }
+    }
+}
+
+void RenderBlock::paintEllipsisBoxes(PaintInfo& paintInfo, int tx, int ty)
+{
+    if (!shouldPaintWithinRoot(paintInfo) || !firstLineBox())
+        return;
+
+    if (style()->visibility() == VISIBLE && paintInfo.phase == PaintPhaseForeground) {
+        // We can check the first box and last box and avoid painting if we don't
+        // intersect.
+        int yPos = ty + firstLineBox()->yPos();;
+        int h = lastLineBox()->yPos() + lastLineBox()->height() - firstLineBox()->yPos();
+        if (yPos >= paintInfo.rect.bottom() || yPos + h <= paintInfo.rect.y())
+            return;
+
+        // See if our boxes intersect with the dirty rect.  If so, then we paint
+        // them.  Note that boxes can easily overlap, so we can't make any assumptions
+        // based off positions of our first line box or our last line box.
+        for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
+            yPos = ty + curr->yPos();
+            h = curr->height();
+            if (curr->ellipsisBox() && yPos < paintInfo.rect.bottom() && yPos + h > paintInfo.rect.y())
+                curr->paintEllipsisBox(paintInfo, tx, ty);
+        }
+    }
+}
+
+HashMap<RenderBlock*, RenderFlowSequencedSet*>* continuationOutlineTable()
+{
+    static HashMap<RenderBlock*, RenderFlowSequencedSet*> table;
+    return &table;
+}
+
+void RenderBlock::addContinuationWithOutline(RenderFlow* flow)
+{
+    // We can't make this work if the inline is in a layer.  We'll just rely on the broken
+    // way of painting.
+    ASSERT(!flow->layer());
+    
+    HashMap<RenderBlock*, RenderFlowSequencedSet*>* table = continuationOutlineTable();
+    RenderFlowSequencedSet* continuations = table->get(this);
+    if (!continuations) {
+        continuations = new RenderFlowSequencedSet;
+        table->set(this, continuations);
+    }
+    
+    continuations->add(flow);
+}
+
+void RenderBlock::paintContinuationOutlines(PaintInfo& info, int tx, int ty)
+{
+    HashMap<RenderBlock*, RenderFlowSequencedSet*>* table = continuationOutlineTable();
+    if (table->isEmpty())
+        return;
+        
+    RenderFlowSequencedSet* continuations = table->get(this);
+    if (!continuations)
+        return;
+        
+    // Paint each continuation outline.
+    RenderFlowSequencedSet::iterator end = continuations->end();
+    for (RenderFlowSequencedSet::iterator it = continuations->begin(); it != end; ++it) {
+        // Need to add in the coordinates of the intervening blocks.
+        RenderFlow* flow = *it;
+        RenderBlock* block = flow->containingBlock();
+        for ( ; block && block != this; block = block->containingBlock()) {
+            tx += block->xPos();
+            ty += block->yPos();
+        }
+        ASSERT(block);   
+        flow->paintOutline(info.context, tx, ty);
+    }
+    
+    // Delete
+    delete continuations;
+    table->remove(this);
+}
+
+void RenderBlock::setSelectionState(SelectionState s)
+{
+    if (selectionState() == s)
+        return;
+    
+    if (s == SelectionInside && selectionState() != SelectionNone)
+        return;
+
+    if ((s == SelectionStart && selectionState() == SelectionEnd) ||
+        (s == SelectionEnd && selectionState() == SelectionStart))
+        m_selectionState = SelectionBoth;
+    else
+        m_selectionState = s;
+    
+    RenderBlock* cb = containingBlock();
+    if (cb && !cb->isRenderView())
+        cb->setSelectionState(s);
+}
+
+bool RenderBlock::shouldPaintSelectionGaps() const
+{
+    return m_selectionState != SelectionNone && style()->visibility() == VISIBLE && isSelectionRoot();
+}
+
+bool RenderBlock::isSelectionRoot() const
+{
+    if (!element())
+        return false;
+        
+    // FIXME: Eventually tables should have to learn how to fill gaps between cells, at least in simple non-spanning cases.
+    if (isTable())
+        return false;
+        
+    if (isBody() || isRoot() || hasOverflowClip() || isRelPositioned() ||
+        isFloatingOrPositioned() || isTableCell() || isInlineBlockOrInlineTable() || hasTransform())
+        return true;
+    
+    if (view() && view()->selectionStart()) {
+        Node* startElement = view()->selectionStart()->element();
+        if (startElement && startElement->rootEditableElement() == element())
+            return true;
+    }
+    
+    return false;
+}
+
+GapRects RenderBlock::selectionGapRects()
+{
+    ASSERT(!needsLayout());
+
+    if (!shouldPaintSelectionGaps())
+        return GapRects();
+
+    int tx, ty;
+    absolutePositionForContent(tx, ty);
+    if (hasOverflowClip())
+        layer()->subtractScrollOffset(tx, ty);
+
+    int lastTop = -borderTopExtra();
+    int lastLeft = leftSelectionOffset(this, lastTop);
+    int lastRight = rightSelectionOffset(this, lastTop);
+    
+    return fillSelectionGaps(this, tx, ty, tx, ty, lastTop, lastLeft, lastRight);
+}
+
+void RenderBlock::paintSelection(PaintInfo& paintInfo, int tx, int ty)
+{
+    if (shouldPaintSelectionGaps() && paintInfo.phase == PaintPhaseForeground) {
+        int lastTop = -borderTopExtra();
+        int lastLeft = leftSelectionOffset(this, lastTop);
+        int lastRight = rightSelectionOffset(this, lastTop);
+        fillSelectionGaps(this, tx, ty, tx, ty, lastTop, lastLeft, lastRight, &paintInfo);
+    }
+}
+
+GapRects RenderBlock::fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
+                                        int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)
+{
+    // FIXME: overflow: auto/scroll regions need more math here, since painting in the border box is different from painting in the padding box (one is scrolled, the other is
+    // fixed).
+    GapRects result;
+    if (!isBlockFlow()) // FIXME: Make multi-column selection gap filling work someday.
+        return result;
+
+    if (m_hasColumns || hasTransform()) {
+        // FIXME: We should learn how to gap fill multiple columns and transforms eventually.
+        lastTop = (ty - blockY) + height();
+        lastLeft = leftSelectionOffset(rootBlock, height());
+        lastRight = rightSelectionOffset(rootBlock, height());
+        return result;
+    }
+
+    if (childrenInline())
+        result = fillInlineSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo);
+    else
+        result = fillBlockSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo);
+
+    // Go ahead and fill the vertical gap all the way to the bottom of our block if the selection extends past our block.
+    if (rootBlock == this && (m_selectionState != SelectionBoth && m_selectionState != SelectionEnd))
+        result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + height() + borderBottomExtra(),
+                                                    rootBlock, blockX, blockY, paintInfo));
+    return result;
+}
+
+GapRects RenderBlock::fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty, 
+                                              int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)
+{
+    GapRects result;
+
+    bool containsStart = selectionState() == SelectionStart || selectionState() == SelectionBoth;
+
+    if (!firstLineBox()) {
+        if (containsStart) {
+            // Go ahead and update our lastY to be the bottom of the block.  <hr>s or empty blocks with height can trip this
+            // case.
+            lastTop = (ty - blockY) + height();
+            lastLeft = leftSelectionOffset(rootBlock, height());
+            lastRight = rightSelectionOffset(rootBlock, height());
+        }
+        return result;
+    }
+
+    RootInlineBox* lastSelectedLine = 0;
+    RootInlineBox* curr;
+    for (curr = firstRootBox(); curr && !curr->hasSelectedChildren(); curr = curr->nextRootBox()) { }
+
+    // Now paint the gaps for the lines.
+    for (; curr && curr->hasSelectedChildren(); curr = curr->nextRootBox()) {
+        int selTop =  curr->selectionTop();
+        int selHeight = curr->selectionHeight();
+
+        if (!containsStart && !lastSelectedLine &&
+            selectionState() != SelectionStart && selectionState() != SelectionBoth)
+            result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + selTop,
+                                                        rootBlock, blockX, blockY, paintInfo));
+
+        if (!paintInfo || ty + selTop < paintInfo->rect.bottom() && ty + selTop + selHeight > paintInfo->rect.y())
+            result.unite(curr->fillLineSelectionGap(selTop, selHeight, rootBlock, blockX, blockY, tx, ty, paintInfo));
+
+        lastSelectedLine = curr;
+    }
+
+    if (containsStart && !lastSelectedLine)
+        // Selection must start just after our last line.
+        lastSelectedLine = lastRootBox();
+
+    if (lastSelectedLine && selectionState() != SelectionEnd && selectionState() != SelectionBoth) {
+        // Go ahead and update our lastY to be the bottom of the last selected line.
+        lastTop = (ty - blockY) + lastSelectedLine->bottomOverflow();
+        lastLeft = leftSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow());
+        lastRight = rightSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow());
+    }
+    return result;
+}
+
+GapRects RenderBlock::fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
+                                             int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)
+{
+    GapRects result;
+
+    // Go ahead and jump right to the first block child that contains some selected objects.
+    RenderObject* curr;
+    for (curr = firstChild(); curr && curr->selectionState() == SelectionNone; curr = curr->nextSibling()) { }
+
+    for (bool sawSelectionEnd = false; curr && !sawSelectionEnd; curr = curr->nextSibling()) {
+        SelectionState childState = curr->selectionState();
+        if (childState == SelectionBoth || childState == SelectionEnd)
+            sawSelectionEnd = true;
+
+        if (curr->isFloatingOrPositioned())
+            continue; // We must be a normal flow object in order to even be considered.
+
+        if (curr->isRelPositioned() && curr->hasLayer()) {
+            // If the relposition offset is anything other than 0, then treat this just like an absolute positioned element.
+            // Just disregard it completely.
+            int x = 0;
+            int y = 0;
+            curr->layer()->relativePositionOffset(x, y);
+            if (x || y)
+                continue;
+        }
+
+        bool paintsOwnSelection = curr->shouldPaintSelectionGaps() || curr->isTable(); // FIXME: Eventually we won't special-case table like this.
+        bool fillBlockGaps = paintsOwnSelection || (curr->canBeSelectionLeaf() && childState != SelectionNone);
+        if (fillBlockGaps) {
+            // We need to fill the vertical gap above this object.
+            if (childState == SelectionEnd || childState == SelectionInside)
+                // Fill the gap above the object.
+                result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, 
+                                                            ty + curr->yPos(), rootBlock, blockX, blockY, paintInfo));
+
+            // Only fill side gaps for objects that paint their own selection if we know for sure the selection is going to extend all the way *past*
+            // our object.  We know this if the selection did not end inside our object.
+            if (paintsOwnSelection && (childState == SelectionStart || sawSelectionEnd))
+                childState = SelectionNone;
+
+            // Fill side gaps on this object based off its state.
+            bool leftGap, rightGap;
+            getHorizontalSelectionGapInfo(childState, leftGap, rightGap);
+
+            if (leftGap)
+                result.uniteLeft(fillLeftSelectionGap(this, curr->xPos(), curr->yPos(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo));
+            if (rightGap)
+                result.uniteRight(fillRightSelectionGap(this, curr->xPos() + curr->width(), curr->yPos(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo));
+
+            // Update lastTop to be just underneath the object.  lastLeft and lastRight extend as far as
+            // they can without bumping into floating or positioned objects.  Ideally they will go right up
+            // to the border of the root selection block.
+            lastTop = (ty - blockY) + (curr->yPos() + curr->height());
+            lastLeft = leftSelectionOffset(rootBlock, curr->yPos() + curr->height());
+            lastRight = rightSelectionOffset(rootBlock, curr->yPos() + curr->height());
+        } else if (childState != SelectionNone)
+            // We must be a block that has some selected object inside it.  Go ahead and recur.
+            result.unite(static_cast<RenderBlock*>(curr)->fillSelectionGaps(rootBlock, blockX, blockY, tx + curr->xPos(), ty + curr->yPos(), 
+                                                                            lastTop, lastLeft, lastRight, paintInfo));
+    }
+    return result;
+}
+
+IntRect RenderBlock::fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo* paintInfo)
+{
+    if (width <= 0 || height <= 0)
+        return IntRect();
+    IntRect gapRect(xPos, yPos, width, height);
+    if (paintInfo && selObj->style()->visibility() == VISIBLE)
+        paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());
+    return gapRect;
+}
+
+IntRect RenderBlock::fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock,
+                                              int blockX, int blockY, const PaintInfo* paintInfo)
+{
+    int top = blockY + lastTop;
+    int height = bottomY - top;
+    if (height <= 0)
+        return IntRect();
+
+    // Get the selection offsets for the bottom of the gap
+    int left = blockX + max(lastLeft, leftSelectionOffset(rootBlock, bottomY));
+    int right = blockX + min(lastRight, rightSelectionOffset(rootBlock, bottomY));
+    int width = right - left;
+    if (width <= 0)
+        return IntRect();
+
+    IntRect gapRect(left, top, width, height);
+    if (paintInfo)
+        paintInfo->context->fillRect(gapRect, selectionBackgroundColor());
+    return gapRect;
+}
+
+IntRect RenderBlock::fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,
+                                          int blockX, int blockY, int tx, int ty, const PaintInfo* paintInfo)
+{
+    int top = yPos + ty;
+    int left = blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height));
+    int width = tx + xPos - left;
+    if (width <= 0)
+        return IntRect();
+
+    IntRect gapRect(left, top, width, height);
+    if (paintInfo)
+        paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());
+    return gapRect;
+}
+
+IntRect RenderBlock::fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,
+                                           int blockX, int blockY, int tx, int ty, const PaintInfo* paintInfo)
+{
+    int left = xPos + tx;
+    int top = yPos + ty;
+    int right = blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height));
+    int width = right - left;
+    if (width <= 0)
+        return IntRect();
+
+    IntRect gapRect(left, top, width, height);
+    if (paintInfo)
+        paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());
+    return gapRect;
+}
+
+void RenderBlock::getHorizontalSelectionGapInfo(SelectionState state, bool& leftGap, bool& rightGap)
+{
+    bool ltr = style()->direction() == LTR;
+    leftGap = (state == RenderObject::SelectionInside) ||
+              (state == RenderObject::SelectionEnd && ltr) ||
+              (state == RenderObject::SelectionStart && !ltr);
+    rightGap = (state == RenderObject::SelectionInside) ||
+               (state == RenderObject::SelectionStart && ltr) ||
+               (state == RenderObject::SelectionEnd && !ltr);
+}
+
+int RenderBlock::leftSelectionOffset(RenderBlock* rootBlock, int y)
+{
+    int left = leftOffset(y);
+    if (left == borderLeft() + paddingLeft()) {
+        if (rootBlock != this)
+            // The border can potentially be further extended by our containingBlock().
+            return containingBlock()->leftSelectionOffset(rootBlock, y + yPos());
+        return left;
+    }
+    else {
+        RenderBlock* cb = this;
+        while (cb != rootBlock) {
+            left += cb->xPos();
+            cb = cb->containingBlock();
+        }
+    }
+    
+    return left;
+}
+
+int RenderBlock::rightSelectionOffset(RenderBlock* rootBlock, int y)
+{
+    int right = rightOffset(y);
+    if (right == (contentWidth() + (borderLeft() + paddingLeft()))) {
+        if (rootBlock != this)
+            // The border can potentially be further extended by our containingBlock().
+            return containingBlock()->rightSelectionOffset(rootBlock, y + yPos());
+        return right;
+    }
+    else {
+        RenderBlock* cb = this;
+        while (cb != rootBlock) {
+            right += cb->xPos();
+            cb = cb->containingBlock();
+        }
+    }
+    return right;
+}
+
+void RenderBlock::insertPositionedObject(RenderObject *o)
+{
+    // Create the list of special objects if we don't aleady have one
+    if (!m_positionedObjects)
+        m_positionedObjects = new ListHashSet<RenderObject*>;
+
+    m_positionedObjects->add(o);
+}
+
+void RenderBlock::removePositionedObject(RenderObject *o)
+{
+    if (m_positionedObjects)
+        m_positionedObjects->remove(o);
+}
+
+void RenderBlock::removePositionedObjects(RenderBlock* o)
+{
+    if (!m_positionedObjects)
+        return;
+    
+    RenderObject* r;
+    
+    Iterator end = m_positionedObjects->end();
+    
+    Vector<RenderObject*, 16> deadObjects;
+
+    for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {
+        r = *it;
+        if (!o || r->isDescendantOf(o)) {
+            if (o)
+                r->setChildNeedsLayout(true, false);
+            
+            // It is parent blocks job to add positioned child to positioned objects list of its containing block
+            // Parent layout needs to be invalidated to ensure this happens.
+            RenderObject* p = r->parent();
+            while (p && !p->isRenderBlock())
+                p = p->parent();
+            if (p)
+                p->setChildNeedsLayout(true);
+            
+            deadObjects.append(r);
+        }
+    }
+    
+    for (unsigned i = 0; i < deadObjects.size(); i++)
+        m_positionedObjects->remove(deadObjects.at(i));
+}
+
+void RenderBlock::insertFloatingObject(RenderObject *o)
+{
+    // Create the list of special objects if we don't aleady have one
+    if (!m_floatingObjects) {
+        m_floatingObjects = new DeprecatedPtrList<FloatingObject>;
+        m_floatingObjects->setAutoDelete(true);
+    }
+    else {
+        // Don't insert the object again if it's already in the list
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+        FloatingObject* f;
+        while ( (f = it.current()) ) {
+            if (f->node == o) return;
+            ++it;
+        }
+    }
+
+    // Create the special object entry & append it to the list
+
+    FloatingObject *newObj;
+    if (o->isFloating()) {
+        // floating object
+        o->layoutIfNeeded();
+
+        if(o->style()->floating() == FLEFT)
+            newObj = new FloatingObject(FloatingObject::FloatLeft);
+        else
+            newObj = new FloatingObject(FloatingObject::FloatRight);
+
+        newObj->startY = -1;
+        newObj->endY = -1;
+        newObj->width = o->width() + o->marginLeft() + o->marginRight();
+        newObj->noPaint = o->hasLayer(); // If a layer exists, the float will paint itself.  Otherwise someone else will.
+    }
+    else {
+        // We should never get here, as insertFloatingObject() should only ever be called with floating
+        // objects.
+        ASSERT(false);
+        newObj = 0; // keep gcc's uninitialized variable warnings happy
+    }
+
+    newObj->node = o;
+
+    m_floatingObjects->append(newObj);
+}
+
+void RenderBlock::removeFloatingObject(RenderObject *o)
+{
+    if (m_floatingObjects) {
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+        while (it.current()) {
+            if (it.current()->node == o)
+                m_floatingObjects->removeRef(it.current());
+            ++it;
+        }
+    }
+}
+
+void RenderBlock::positionNewFloats()
+{
+    if (!m_floatingObjects)
+        return;
+    
+    FloatingObject* f = m_floatingObjects->last();
+
+    // If all floats have already been positioned, then we have no work to do.
+    if (!f || f->startY != -1)
+        return;
+
+    // Move backwards through our floating object list until we find a float that has
+    // already been positioned.  Then we'll be able to move forward, positioning all of
+    // the new floats that need it.
+    FloatingObject* lastFloat = m_floatingObjects->getPrev();
+    while (lastFloat && lastFloat->startY == -1) {
+        f = m_floatingObjects->prev();
+        lastFloat = m_floatingObjects->getPrev();
+    }
+
+    int y = m_height;
+    
+    // The float cannot start above the y position of the last positioned float.
+    if (lastFloat)
+        y = max(lastFloat->startY, y);
+
+    // Now walk through the set of unpositioned floats and place them.
+    while (f) {
+        // The containing block is responsible for positioning floats, so if we have floats in our
+        // list that come from somewhere else, do not attempt to position them.
+        if (f->node->containingBlock() != this) {
+            f = m_floatingObjects->next();
+            continue;
+        }
+
+        RenderObject* o = f->node;
+        int _height = o->height() + o->marginTop() + o->marginBottom();
+
+        int ro = rightOffset(); // Constant part of right offset.
+        int lo = leftOffset(); // Constat part of left offset.
+        int fwidth = f->width; // The width we look for.
+        if (ro - lo < fwidth)
+            fwidth = ro - lo; // Never look for more than what will be available.
+        
+        IntRect oldRect(o->xPos(), o->yPos() , o->width(), o->height());
+        
+        if (o->style()->clear() & CLEFT)
+            y = max(leftBottom(), y);
+        if (o->style()->clear() & CRIGHT)
+            y = max(rightBottom(), y);
+
+        if (o->style()->floating() == FLEFT) {
+            int heightRemainingLeft = 1;
+            int heightRemainingRight = 1;
+            int fx = leftRelOffset(y,lo, false, &heightRemainingLeft);
+            while (rightRelOffset(y,ro, false, &heightRemainingRight)-fx < fwidth) {
+                y += min(heightRemainingLeft, heightRemainingRight);
+                fx = leftRelOffset(y,lo, false, &heightRemainingLeft);
+            }
+            fx = max(0, fx);
+            f->left = fx;
+            o->setPos(fx + o->marginLeft(), y + o->marginTop());
+        } else {
+            int heightRemainingLeft = 1;
+            int heightRemainingRight = 1;
+            int fx = rightRelOffset(y,ro, false, &heightRemainingRight);
+            while (fx - leftRelOffset(y,lo, false, &heightRemainingLeft) < fwidth) {
+                y += min(heightRemainingLeft, heightRemainingRight);
+                fx = rightRelOffset(y, ro, false, &heightRemainingRight);
+            }
+            fx = max(f->width, fx);
+            f->left = fx - f->width;
+            o->setPos(fx - o->marginRight() - o->width(), y + o->marginTop());
+        }
+
+        f->startY = y;
+        f->endY = f->startY + _height;
+
+        // If the child moved, we have to repaint it.
+        if (o->checkForRepaintDuringLayout())
+            o->repaintDuringLayoutIfMoved(oldRect);
+
+        f = m_floatingObjects->next();
+    }
+}
+
+void RenderBlock::newLine()
+{
+    positionNewFloats();
+    // set y position
+    int newY = 0;
+    switch(m_clearStatus)
+    {
+        case CLEFT:
+            newY = leftBottom();
+            break;
+        case CRIGHT:
+            newY = rightBottom();
+            break;
+        case CBOTH:
+            newY = floatBottom();
+        default:
+            break;
+    }
+    if (m_height < newY)
+        m_height = newY;
+    m_clearStatus = CNONE;
+}
+
+int
+RenderBlock::leftOffset() const
+{
+    return borderLeft()+paddingLeft();
+}
+
+int
+RenderBlock::leftRelOffset(int y, int fixedOffset, bool applyTextIndent,
+                           int *heightRemaining ) const
+{
+    int left = fixedOffset;
+    if (m_floatingObjects) {
+        if ( heightRemaining ) *heightRemaining = 1;
+        FloatingObject* r;
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+        for ( ; (r = it.current()); ++it )
+        {
+            //kdDebug( 6040 ) <<(void *)this << " left: sy, ey, x, w " << r->startY << "," << r->endY << "," << r->left << "," << r->width << " " << endl;
+            if (r->startY <= y && r->endY > y &&
+                r->type() == FloatingObject::FloatLeft &&
+                r->left + r->width > left) {
+                left = r->left + r->width;
+                if ( heightRemaining ) *heightRemaining = r->endY - y;
+            }
+        }
+    }
+
+    if (applyTextIndent && m_firstLine && style()->direction() == LTR) {
+        int cw=0;
+        if (style()->textIndent().isPercent())
+            cw = containingBlock()->availableWidth();
+        left += style()->textIndent().calcMinValue(cw);
+    }
+
+    //kdDebug( 6040 ) << "leftOffset(" << y << ") = " << left << endl;
+    return left;
+}
+
+int
+RenderBlock::rightOffset() const
+{
+    return borderLeft() + paddingLeft() + availableWidth();
+}
+
+int
+RenderBlock::rightRelOffset(int y, int fixedOffset, bool applyTextIndent,
+                            int *heightRemaining ) const
+{
+    int right = fixedOffset;
+
+    if (m_floatingObjects) {
+        if (heightRemaining) *heightRemaining = 1;
+        FloatingObject* r;
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+        for ( ; (r = it.current()); ++it )
+        {
+            //kdDebug( 6040 ) << "right: sy, ey, x, w " << r->startY << "," << r->endY << "," << r->left << "," << r->width << " " << endl;
+            if (r->startY <= y && r->endY > y &&
+                r->type() == FloatingObject::FloatRight &&
+                r->left < right) {
+                right = r->left;
+                if ( heightRemaining ) *heightRemaining = r->endY - y;
+            }
+        }
+    }
+    
+    if (applyTextIndent && m_firstLine && style()->direction() == RTL) {
+        int cw=0;
+        if (style()->textIndent().isPercent())
+            cw = containingBlock()->availableWidth();
+        right -= style()->textIndent().calcMinValue(cw);
+    }
+    
+    //kdDebug( 6040 ) << "rightOffset(" << y << ") = " << right << endl;
+    return right;
+}
+
+int
+RenderBlock::lineWidth(int y) const
+{
+    //kdDebug( 6040 ) << "lineWidth(" << y << ")=" << rightOffset(y) - leftOffset(y) << endl;
+    int result = rightOffset(y) - leftOffset(y);
+    return (result < 0) ? 0 : result;
+}
+
+int RenderBlock::nextFloatBottomBelow(int height) const
+{
+    if (!m_floatingObjects)
+        return 0;
+
+    int bottom = INT_MAX;
+    FloatingObject* r;
+    DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+    for ( ; (r = it.current()); ++it) {
+        if (r->endY > height)
+            bottom = min(r->endY, bottom);
+    }
+
+    return bottom == INT_MAX ? 0 : bottom;
+}
+
+int
+RenderBlock::floatBottom() const
+{
+    if (!m_floatingObjects) return 0;
+    int bottom=0;
+    FloatingObject* r;
+    DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+    for ( ; (r = it.current()); ++it )
+        if (r->endY>bottom)
+            bottom=r->endY;
+    return bottom;
+}
+
+IntRect RenderBlock::floatRect() const
+{
+    IntRect result;
+    if (!m_floatingObjects || hasOverflowClip())
+        return result;
+    FloatingObject* r;
+    DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+    for (; (r = it.current()); ++it) {
+        if (!r->noPaint && !r->node->hasLayer()) {
+            IntRect childRect = r->node->overflowRect(false);
+            childRect.move(r->left + r->node->marginLeft(), r->startY + r->node->marginTop());
+            result.unite(childRect);
+        }
+    }
+
+    return result;
+}
+
+int RenderBlock::lowestPosition(bool includeOverflowInterior, bool includeSelf) const
+{
+    int bottom = RenderFlow::lowestPosition(includeOverflowInterior, includeSelf);
+    if (!includeOverflowInterior && hasOverflowClip())
+        return bottom;
+
+    if (includeSelf && m_overflowHeight > bottom)
+        bottom = m_overflowHeight;
+        
+    if (m_positionedObjects) {
+        RenderObject* r;
+        Iterator end = m_positionedObjects->end();
+        for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {
+            r = *it;
+            // Fixed positioned objects do not scroll and thus should not constitute
+            // part of the lowest position.
+            if (r->style()->position() != FixedPosition) {
+                // FIXME: Should work for overflow sections too.
+                // If a positioned object lies completely to the left of the root it will be unreachable via scrolling.
+                // Therefore we should not allow it to contribute to the lowest position.
+                if (!isRenderView() || r->xPos() + r->width() > 0 || r->xPos() + r->rightmostPosition(false) > 0) {
+                    int lp = r->yPos() + r->lowestPosition(false);
+                    bottom = max(bottom, lp);
+                }
+            }
+        }
+    }
+
+    if (m_hasColumns) {
+        Vector<IntRect>* colRects = columnRects();
+        for (unsigned i = 0; i < colRects->size(); i++)
+            bottom = max(bottom, colRects->at(i).bottom());
+        return bottom;
+    }
+
+    if (m_floatingObjects) {
+        FloatingObject* r;
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+        for ( ; (r = it.current()); ++it ) {
+            if (!r->noPaint || r->node->hasLayer()) {
+                int lp = r->startY + r->node->marginTop() + r->node->lowestPosition(false);
+                bottom = max(bottom, lp);
+            }
+        }
+    }
+
+
+    if (!includeSelf && lastLineBox()) {
+        int lp = lastLineBox()->yPos() + lastLineBox()->height();
+        bottom = max(bottom, lp);
+    }
+    
+    return bottom;
+}
+
+int RenderBlock::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const
+{
+    int right = RenderFlow::rightmostPosition(includeOverflowInterior, includeSelf);
+    if (!includeOverflowInterior && hasOverflowClip())
+        return right;
+
+    if (includeSelf && m_overflowWidth > right)
+        right = m_overflowWidth;
+
+    if (m_positionedObjects) {
+        RenderObject* r;
+        Iterator end = m_positionedObjects->end();
+        for (Iterator it = m_positionedObjects->begin() ; it != end; ++it) {
+            r = *it;
+            // Fixed positioned objects do not scroll and thus should not constitute
+            // part of the rightmost position.
+            if (r->style()->position() != FixedPosition) {
+                // FIXME: Should work for overflow sections too.
+                // If a positioned object lies completely above the root it will be unreachable via scrolling.
+                // Therefore we should not allow it to contribute to the rightmost position.
+                if (!isRenderView() || r->yPos() + r->height() > 0 || r->yPos() + r->lowestPosition(false) > 0) {
+                    int rp = r->xPos() + r->rightmostPosition(false);
+                    right = max(right, rp);
+                }
+            }
+        }
+    }
+
+    if (m_hasColumns) {
+        // This only matters for LTR
+        if (style()->direction() == LTR)
+            right = max(columnRects()->last().right(), right);
+        return right;
+    }
+
+    if (m_floatingObjects) {
+        FloatingObject* r;
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+        for ( ; (r = it.current()); ++it ) {
+            if (!r->noPaint || r->node->hasLayer()) {
+                int rp = r->left + r->node->marginLeft() + r->node->rightmostPosition(false);
+                right = max(right, rp);
+            }
+        }
+    }
+
+    if (!includeSelf && firstLineBox()) {
+        for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) {
+            int rp = currBox->xPos() + currBox->width();
+            // If this node is a root editable element, then the rightmostPosition should account for a caret at the end.
+            // FIXME: Need to find another way to do this, since scrollbars could show when we don't want them to.
+            if (node()->isContentEditable() && node() == node()->rootEditableElement() && style()->direction() == LTR)
+                rp += 1;
+            right = max(right, rp);
+        }
+    }
+    
+    return right;
+}
+
+int RenderBlock::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const
+{
+    int left = RenderFlow::leftmostPosition(includeOverflowInterior, includeSelf);
+    if (!includeOverflowInterior && hasOverflowClip())
+        return left;
+    
+    if (includeSelf && m_overflowLeft < left)
+        left = m_overflowLeft;
+
+    if (m_positionedObjects) {
+        RenderObject* r;
+        Iterator end = m_positionedObjects->end();
+        for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {
+            r = *it;
+            // Fixed positioned objects do not scroll and thus should not constitute
+            // part of the leftmost position.
+            if (r->style()->position() != FixedPosition) {
+                // FIXME: Should work for overflow sections too.
+                // If a positioned object lies completely above the root it will be unreachable via scrolling.
+                // Therefore we should not allow it to contribute to the leftmost position.
+                if (!isRenderView() || r->yPos() + r->height() > 0 || r->yPos() + r->lowestPosition(false) > 0) {
+                    int lp = r->xPos() + r->leftmostPosition(false);
+                    left = min(left, lp);
+                }
+            }
+        }
+    }
+
+    if (m_hasColumns) {
+        // This only matters for RTL
+        if (style()->direction() == RTL)
+            left = min(columnRects()->last().x(), left);
+        return left;
+    }
+
+    if (m_floatingObjects) {
+        FloatingObject* r;
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+        for ( ; (r = it.current()); ++it ) {
+            if (!r->noPaint || r->node->hasLayer()) {
+                int lp = r->left + r->node->marginLeft() + r->node->leftmostPosition(false);
+                left = min(left, lp);
+            }
+        }
+    }
+
+    if (!includeSelf && firstLineBox()) {
+        for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox())
+            left = min(left, (int)currBox->xPos());
+    }
+    
+    return left;
+}
+
+int
+RenderBlock::leftBottom()
+{
+    if (!m_floatingObjects) return 0;
+    int bottom=0;
+    FloatingObject* r;
+    DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+    for ( ; (r = it.current()); ++it )
+        if (r->endY > bottom && r->type() == FloatingObject::FloatLeft)
+            bottom=r->endY;
+
+    return bottom;
+}
+
+int
+RenderBlock::rightBottom()
+{
+    if (!m_floatingObjects) return 0;
+    int bottom=0;
+    FloatingObject* r;
+    DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+    for ( ; (r = it.current()); ++it )
+        if (r->endY>bottom && r->type() == FloatingObject::FloatRight)
+            bottom=r->endY;
+
+    return bottom;
+}
+
+void
+RenderBlock::clearFloats()
+{
+    if (m_floatingObjects)
+        m_floatingObjects->clear();
+
+    // Inline blocks are covered by the isReplaced() check in the avoidFloats method.
+    if (avoidsFloats() || isRoot() || isRenderView() || isFloatingOrPositioned() || isTableCell())
+        return;
+    
+    // Attempt to locate a previous sibling with overhanging floats.  We skip any elements that are
+    // out of flow (like floating/positioned elements), and we also skip over any objects that may have shifted
+    // to avoid floats.
+    bool parentHasFloats = false;
+    RenderObject *prev = previousSibling();
+    while (prev && (!prev->isRenderBlock() || prev->avoidsFloats() || prev->isFloatingOrPositioned())) {
+        if (prev->isFloating())
+            parentHasFloats = true;
+         prev = prev->previousSibling();
+    }
+
+    // First add in floats from the parent.
+    int offset = m_y;
+    if (parentHasFloats)
+        addIntrudingFloats(static_cast<RenderBlock *>(parent()),
+                           parent()->borderLeft() + parent()->paddingLeft(), offset);
+
+    int xoffset = 0;
+    if (prev)
+        offset -= prev->yPos();
+    else {
+        prev = parent();
+        xoffset += prev->borderLeft() + prev->paddingLeft();
+    }
+    //kdDebug() << "RenderBlock::clearFloats found previous "<< (void *)this << " prev=" << (void *)prev<< endl;
+
+    // Add overhanging floats from the previous RenderBlock, but only if it has a float that intrudes into our space.
+    if (!prev->isRenderBlock()) return;
+    RenderBlock* block = static_cast<RenderBlock *>(prev);
+    if (!block->m_floatingObjects) return;
+    if (block->floatBottom() > offset)
+        addIntrudingFloats(block, xoffset, offset);
+}
+
+int RenderBlock::addOverhangingFloats(RenderBlock* child, int xoff, int yoff, bool makeChildPaintOtherFloats)
+{
+    // Prevent floats from being added to the canvas by the root element, e.g., <html>.
+    if (child->hasOverflowClip() || !child->containsFloats() || child->isRoot())
+        return 0;
+
+    int lowestFloatBottom = 0;
+
+    // Floats that will remain the child's responsiblity to paint should factor into its
+    // visual overflow.
+    IntRect floatsOverflowRect;
+    DeprecatedPtrListIterator<FloatingObject> it(*child->m_floatingObjects);
+    for (FloatingObject* r; (r = it.current()); ++it) {
+        int bottom = child->yPos() + r->endY;
+        lowestFloatBottom = max(lowestFloatBottom, bottom);
+
+        if (bottom > height()) {
+            // If the object is not in the list, we add it now.
+            if (!containsFloat(r->node)) {
+                FloatingObject *floatingObj = new FloatingObject(r->type());
+                floatingObj->startY = r->startY - yoff;
+                floatingObj->endY = r->endY - yoff;
+                floatingObj->left = r->left - xoff;
+                floatingObj->width = r->width;
+                floatingObj->node = r->node;
+
+                // The nearest enclosing layer always paints the float (so that zindex and stacking
+                // behaves properly).  We always want to propagate the desire to paint the float as
+                // far out as we can, to the outermost block that overlaps the float, stopping only
+                // if we hit a layer boundary.
+                if (r->node->enclosingLayer() == enclosingLayer())
+                    r->noPaint = true;
+                else
+                    floatingObj->noPaint = true;
+                
+                // We create the floating object list lazily.
+                if (!m_floatingObjects) {
+                    m_floatingObjects = new DeprecatedPtrList<FloatingObject>;
+                    m_floatingObjects->setAutoDelete(true);
+                }
+                m_floatingObjects->append(floatingObj);
+            }
+        } else if (makeChildPaintOtherFloats && r->noPaint && !r->node->hasLayer() && r->node->isDescendantOf(child) && r->node->enclosingLayer() == child->enclosingLayer())
+            // The float is not overhanging from this block, so if it is a descendant of the child, the child should
+            // paint it (the other case is that it is intruding into the child), unless it has its own layer or enclosing
+            // layer.
+            // If makeChildPaintOtherFloats is false, it means that the child must already know about all the floats
+            // it should paint.
+            r->noPaint = false;
+
+        if (!r->noPaint && !r->node->hasLayer()) {
+            IntRect floatOverflowRect = r->node->overflowRect(false);
+            floatOverflowRect.move(r->left + r->node->marginLeft(), r->startY + r->node->marginTop());
+            floatsOverflowRect.unite(floatOverflowRect);
+        }
+    }
+    child->addVisualOverflow(floatsOverflowRect);
+    return lowestFloatBottom;
+}
+
+void RenderBlock::addIntrudingFloats(RenderBlock* prev, int xoff, int yoff)
+{
+    // If the parent or previous sibling doesn't have any floats to add, don't bother.
+    if (!prev->m_floatingObjects)
+        return;
+
+    DeprecatedPtrListIterator<FloatingObject> it(*prev->m_floatingObjects);
+    for (FloatingObject *r; (r = it.current()); ++it) {
+        if (r->endY > yoff) {
+            // The object may already be in our list. Check for it up front to avoid
+            // creating duplicate entries.
+            FloatingObject* f = 0;
+            if (m_floatingObjects) {
+                DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+                while ((f = it.current())) {
+                    if (f->node == r->node) break;
+                    ++it;
+                }
+            }
+            if (!f) {
+                FloatingObject *floatingObj = new FloatingObject(r->type());
+                floatingObj->startY = r->startY - yoff;
+                floatingObj->endY = r->endY - yoff;
+                floatingObj->left = r->left - xoff;
+                // Applying the child's margin makes no sense in the case where the child was passed in.
+                // since his own margin was added already through the subtraction of the |xoff| variable
+                // above.  |xoff| will equal -flow->marginLeft() in this case, so it's already been taken
+                // into account.  Only apply this code if |child| is false, since otherwise the left margin
+                // will get applied twice.
+                if (prev != parent())
+                    floatingObj->left += prev->marginLeft();
+                floatingObj->left -= marginLeft();
+                floatingObj->noPaint = true;  // We are not in the direct inheritance chain for this float. We will never paint it.
+                floatingObj->width = r->width;
+                floatingObj->node = r->node;
+                
+                // We create the floating object list lazily.
+                if (!m_floatingObjects) {
+                    m_floatingObjects = new DeprecatedPtrList<FloatingObject>;
+                    m_floatingObjects->setAutoDelete(true);
+                }
+                m_floatingObjects->append(floatingObj);
+            }
+        }
+    }
+}
+
+bool RenderBlock::avoidsFloats() const
+{
+    // Floats can't intrude into our box if we have a non-auto column count or width.
+    return RenderFlow::avoidsFloats() || !style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth();
+}
+
+bool RenderBlock::containsFloat(RenderObject* o)
+{
+    if (m_floatingObjects) {
+        DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+        while (it.current()) {
+            if (it.current()->node == o)
+                return true;
+            ++it;
+        }
+    }
+    return false;
+}
+
+void RenderBlock::markAllDescendantsWithFloatsForLayout(RenderObject* floatToRemove)
+{
+    setChildNeedsLayout(true);
+
+    if (floatToRemove)
+        removeFloatingObject(floatToRemove);
+
+    // Iterate over our children and mark them as needed.
+    if (!childrenInline()) {
+        for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
+            if (isBlockFlow() && !child->isFloatingOrPositioned() &&
+                ((floatToRemove ? child->containsFloat(floatToRemove) : child->containsFloats()) || child->shrinkToAvoidFloats()))
+                child->markAllDescendantsWithFloatsForLayout(floatToRemove);
+        }
+    }
+}
+
+int RenderBlock::getClearDelta(RenderObject *child)
+{
+    // There is no need to compute clearance if we have no floats.
+    if (!containsFloats())
+        return 0;
+    
+    // At least one float is present.  We need to perform the clearance computation.
+    bool clearSet = child->style()->clear() != CNONE;
+    int bottom = 0;
+    switch (child->style()->clear()) {
+        case CNONE:
+            break;
+        case CLEFT:
+            bottom = leftBottom();
+            break;
+        case CRIGHT:
+            bottom = rightBottom();
+            break;
+        case CBOTH:
+            bottom = floatBottom();
+            break;
+    }
+
+    // We also clear floats if we are too big to sit on the same line as a float (and wish to avoid floats by default).
+    // FIXME: Note that the remaining space checks aren't quite accurate, since you should be able to clear only some floats (the minimum # needed
+    // to fit) and not all (we should be using nextFloatBottomBelow and looping).
+    // Do not allow tables to wrap in quirks or even in almost strict mode 
+    // (ebay on the PLT, finance.yahoo.com in the real world, versiontracker.com forces even almost strict mode not to work)
+    int result = clearSet ? max(0, bottom - child->yPos()) : 0;
+    if (!result && child->avoidsFloats() && child->style()->width().isFixed() && 
+        child->minPrefWidth() > lineWidth(child->yPos()) && child->minPrefWidth() <= availableWidth() && 
+        document()->inStrictMode())   
+        result = max(0, floatBottom() - child->yPos());
+    return result;
+}
+
+void RenderBlock::addVisualOverflow(const IntRect& r)
+{
+    if (r.isEmpty())
+        return;
+    m_overflowLeft = min(m_overflowLeft, r.x());
+    m_overflowWidth = max(m_overflowWidth, r.right());
+    m_overflowTop = min(m_overflowTop, r.y());
+    m_overflowHeight = max(m_overflowHeight, r.bottom());
+}
+
+bool RenderBlock::isPointInOverflowControl(HitTestResult& result, int _x, int _y, int _tx, int _ty)
+{
+    if (!scrollsOverflow())
+        return false;
+
+    return layer()->hitTestOverflowControls(result);
+}
+
+bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction)
+{
+    bool inlineFlow = isInlineFlow();
+
+    int tx = _tx + m_x;
+    int ty = _ty + m_y + borderTopExtra();
+
+    if (!inlineFlow && !isRenderView()) {
+        // Check if we need to do anything at all.
+        IntRect overflowBox = overflowRect(false);
+        overflowBox.move(tx, ty);
+        if (!overflowBox.contains(_x, _y))
+            return false;
+    }
+
+    if (isPointInOverflowControl(result, _x, _y, tx, ty)) {
+        if (hitTestAction == HitTestBlockBackground) {
+            updateHitTestResult(result, IntPoint(_x - tx, _y - ty));
+            return true;
+        }
+        return false;
+    }
+
+     // If we have lightweight control clipping, then we can't have any spillout. 
+    if (!hasControlClip() || controlClipRect(tx, ty).contains(_x, _y)) {
+        // Hit test descendants first.
+        int scrolledX = tx;
+        int scrolledY = ty;
+        if (hasOverflowClip())
+            m_layer->subtractScrollOffset(scrolledX, scrolledY);
+
+        // Hit test contents if we don't have columns.
+        if (!m_hasColumns && hitTestContents(request, result, _x, _y, scrolledX, scrolledY, hitTestAction))
+            return true;
+            
+        // Hit test our columns if we do have them.
+        if (m_hasColumns && hitTestColumns(request, result, _x, _y, scrolledX, scrolledY, hitTestAction))
+            return true;
+
+        // Hit test floats.
+        if (hitTestAction == HitTestFloat && m_floatingObjects) {
+            if (isRenderView()) {
+                scrolledX += static_cast<RenderView*>(this)->frameView()->contentsX();
+                scrolledY += static_cast<RenderView*>(this)->frameView()->contentsY();
+            }
+            
+            FloatingObject* o;
+            DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+            for (it.toLast(); (o = it.current()); --it) {
+                if (!o->noPaint && !o->node->hasLayer()) {
+                    int xoffset = scrolledX + o->left + o->node->marginLeft() - o->node->xPos();
+                    int yoffset =  scrolledY + o->startY + o->node->marginTop() - o->node->yPos();
+                    if (o->node->hitTest(request, result, IntPoint(_x, _y), xoffset, yoffset)) {
+                        updateHitTestResult(result, IntPoint(_x - xoffset, _y - yoffset));
+                        return true;
+                    }
+                }
+            }
+        }
+    }
+
+    // Now hit test our background.
+    if (!inlineFlow && (hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground)) {
+        int topExtra = borderTopExtra();
+        IntRect boundsRect(tx, ty - topExtra, m_width, m_height + topExtra + borderBottomExtra());
+        if (style()->visibility() == VISIBLE && boundsRect.contains(_x, _y)) {
+            updateHitTestResult(result, IntPoint(_x - tx, _y - ty + topExtra));
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool RenderBlock::hitTestColumns(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)
+{
+    // We need to do multiple passes, breaking up our hit testing into strips.
+    // We can always go left to right, since column contents are clipped (meaning that there
+    // can't be any overlap).
+    int currXOffset = 0;
+    int currYOffset = 0;
+    int colGap = columnGap();
+    Vector<IntRect>* colRects = columnRects();
+    for (unsigned i = 0; i < colRects->size(); i++) {
+        IntRect colRect = colRects->at(i);
+        colRect.move(tx, ty);
+        
+        if (colRect.contains(x, y)) {
+            // The point is inside this column.
+            // Adjust tx and ty to change where we hit test.
+        
+            int finalX = tx + currXOffset;
+            int finalY = ty + currYOffset;
+            return hitTestContents(request, result, x, y, finalX, finalY, hitTestAction);
+        }
+        
+        // Move to the next position.
+        if (style()->direction() == LTR)
+            currXOffset += colRect.width() + colGap;
+        else
+            currXOffset -= (colRect.width() + colGap);
+
+        currYOffset -= colRect.height();
+    }
+
+    return false;
+}
+
+bool RenderBlock::hitTestContents(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)
+{
+    if (childrenInline() && !isTable()) {
+        // We have to hit-test our line boxes.
+        if (hitTestLines(request, result, x, y, tx, ty, hitTestAction)) {
+            updateHitTestResult(result, IntPoint(x - tx, y - ty));
+            return true;
+        }
+    } else {
+        // Hit test our children.
+        HitTestAction childHitTest = hitTestAction;
+        if (hitTestAction == HitTestChildBlockBackgrounds)
+            childHitTest = HitTestChildBlockBackground;
+        for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
+            // FIXME: We have to skip over inline flows, since they can show up inside RenderTables at the moment (a demoted inline <form> for example).  If we ever implement a
+            // table-specific hit-test method (which we should do for performance reasons anyway), then we can remove this check.
+            if (!child->hasLayer() && !child->isFloating() && !child->isInlineFlow() && child->nodeAtPoint(request, result, x, y, tx, ty, childHitTest)) {
+                updateHitTestResult(result, IntPoint(x - tx, y - ty));
+                return true;
+            }
+        }
+    }
+    
+    return false;
+}
+
+Position RenderBlock::positionForBox(InlineBox *box, bool start) const
+{
+    if (!box)
+        return Position();
+
+    if (!box->object()->element())
+        return Position(element(), start ? caretMinOffset() : caretMaxOffset());
+
+    if (!box->isInlineTextBox())
+        return Position(box->object()->element(), start ? box->object()->caretMinOffset() : box->object()->caretMaxOffset());
+
+    InlineTextBox *textBox = static_cast<InlineTextBox *>(box);
+    return Position(box->object()->element(), start ? textBox->start() : textBox->start() + textBox->len());
+}
+
+Position RenderBlock::positionForRenderer(RenderObject* renderer, bool start) const
+{
+    if (!renderer)
+        return Position(element(), 0);
+
+    Node* node = renderer->element() ? renderer->element() : element();
+    if (!node)
+        return Position();
+
+    ASSERT(renderer == node->renderer());
+
+    int offset = start ? renderer->caretMinOffset() : renderer->caretMaxOffset();
+
+    // FIXME: This was a runtime check that seemingly couldn't fail; changed it to an assertion for now.
+    ASSERT(!node->isCharacterDataNode() || renderer->isText());
+
+    return Position(node, offset);
+}
+
+VisiblePosition RenderBlock::positionForCoordinates(int x, int y)
+{
+    if (isTable())
+        return RenderFlow::positionForCoordinates(x, y); 
+
+    int top = borderTop();
+    int bottom = top + borderTopExtra() + paddingTop() + contentHeight() + paddingBottom() + borderBottomExtra();
+
+    int left = borderLeft();
+    int right = left + paddingLeft() + contentWidth() + paddingRight();
+
+    Node* n = element();
+    
+    int contentsX = x;
+    int contentsY = y - borderTopExtra();
+    if (hasOverflowClip())
+        m_layer->scrollOffset(contentsX, contentsY);
+    if (m_hasColumns) {
+        IntPoint contentsPoint(contentsX, contentsY);
+        adjustPointToColumnContents(contentsPoint);
+        contentsX = contentsPoint.x();
+        contentsY = contentsPoint.y();
+    }
+
+    if (isReplaced()) {
+        if (y < 0 || y < height() && x < 0)
+            return VisiblePosition(n, caretMinOffset(), DOWNSTREAM);
+        if (y >= height() || y >= 0 && x >= width())
+            return VisiblePosition(n, caretMaxOffset(), DOWNSTREAM);
+    } 
+
+    // If we start inside the shadow tree, we will stay inside (even if the point is above or below).
+    if (!(n && n->isShadowNode()) && !childrenInline()) {
+        // Don't return positions inside editable roots for coordinates outside those roots, except for coordinates outside
+        // a document that is entirely editable.
+        bool isEditableRoot = n && n->rootEditableElement() == n && !n->hasTagName(bodyTag) && !n->hasTagName(htmlTag);
+
+        if (y < top || (isEditableRoot && (y < bottom && x < left))) {
+            if (!isEditableRoot)
+                if (RenderObject* c = firstChild()) { // FIXME: This code doesn't make any sense.  This child could be an inline or a positioned element or a float or a compact, etc.
+                    VisiblePosition p = c->positionForCoordinates(contentsX - c->xPos(), contentsY - c->yPos());
+                    if (p.isNotNull())
+                        return p;
+                }
+            if (n) {
+                if (Node* sp = n->shadowParentNode())
+                    n = sp;
+                if (Node* p = n->parent())
+                    return VisiblePosition(p, n->nodeIndex(), DOWNSTREAM);
+            }
+            return VisiblePosition(n, 0, DOWNSTREAM);
+        }
+
+        if (y >= bottom || (isEditableRoot && (y >= top && x >= right))) {
+            if (!isEditableRoot)
+                if (RenderObject* c = lastChild()) { // FIXME: This code doesn't make any sense.  This child could be an inline or a positioned element or a float or a compact, ect.
+                    VisiblePosition p = c->positionForCoordinates(contentsX - c->xPos(), contentsY - c->yPos());
+                    if (p.isNotNull())
+                        return p;
+                }
+            if (n) {
+                if (Node* sp = n->shadowParentNode())
+                    n = sp;
+                if (Node* p = n->parent())
+                    return VisiblePosition(p, n->nodeIndex() + 1, DOWNSTREAM);
+            }
+            return VisiblePosition(n, 0, DOWNSTREAM);
+        }
+    }
+
+    if (childrenInline()) {
+        if (!firstRootBox())
+            return VisiblePosition(n, 0, DOWNSTREAM);
+
+        if (contentsY < firstRootBox()->topOverflow() - verticalLineClickFudgeFactor)
+            // y coordinate is above first root line box
+            return VisiblePosition(positionForBox(firstRootBox()->firstLeafChild(), true), DOWNSTREAM);
+        
+        // look for the closest line box in the root box which is at the passed-in y coordinate
+        for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) {
+            // set the bottom based on whether there is a next root box
+            if (root->nextRootBox())
+                // FIXME: make the break point halfway between the bottom of the previous root box and the top of the next root box
+                bottom = root->nextRootBox()->topOverflow();
+            else
+                bottom = root->bottomOverflow() + verticalLineClickFudgeFactor;
+            // check if this root line box is located at this y coordinate
+            if (contentsY < bottom && root->firstChild()) {
+                InlineBox* closestBox = root->closestLeafChildForXPos(x);
+                if (closestBox)
+                    // pass the box a y position that is inside it
+                    return closestBox->object()->positionForCoordinates(contentsX, closestBox->m_y);
+            }
+        }
+
+        if (lastRootBox())
+            // y coordinate is below last root line box
+            return VisiblePosition(positionForBox(lastRootBox()->lastLeafChild(), false), DOWNSTREAM);
+
+        return VisiblePosition(n, 0, DOWNSTREAM);
+    }
+    
+    // See if any child blocks exist at this y coordinate.
+    if (firstChild() && contentsY < firstChild()->yPos())
+        return VisiblePosition(n, 0, DOWNSTREAM);
+    for (RenderObject* renderer = firstChild(); renderer; renderer = renderer->nextSibling()) {
+        if (renderer->height() == 0 || renderer->style()->visibility() != VISIBLE || renderer->isFloatingOrPositioned())
+            continue;
+        RenderObject* next = renderer->nextSibling();
+        while (next && next->isFloatingOrPositioned())
+            next = next->nextSibling();
+        if (next) 
+            bottom = next->yPos();
+        else
+            bottom = top + scrollHeight();
+        if (contentsY >= renderer->yPos() && contentsY < bottom)
+            return renderer->positionForCoordinates(contentsX - renderer->xPos(), contentsY - renderer->yPos());
+    }
+    
+    return RenderFlow::positionForCoordinates(x, y);
+}
+
+int RenderBlock::availableWidth() const
+{
+    // If we have multiple columns, then the available width is reduced to our column width.
+    if (m_hasColumns)
+        return desiredColumnWidth();
+    return contentWidth();
+}
+
+int RenderBlock::columnGap() const
+{
+    if (style()->hasNormalColumnGap())
+        return style()->fontDescription().computedPixelSize(); // "1em" is recommended as the normal gap setting. Matches <p> margins.
+    return static_cast<int>(style()->columnGap());
+}
+
+void RenderBlock::calcColumnWidth()
+{    
+    // Calculate our column width and column count.
+    unsigned desiredColumnCount = 1;
+    int desiredColumnWidth = contentWidth();
+    
+    // For now, we don't support multi-column layouts when printing, since we have to do a lot of work for proper pagination.
+    if (document()->printing() || (style()->hasAutoColumnCount() && style()->hasAutoColumnWidth())) {
+        setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth);
+        return;
+    }
+        
+    int availWidth = desiredColumnWidth;
+    int colGap = columnGap();
+    int colWidth = max(1, static_cast<int>(style()->columnWidth()));
+    int colCount = max(1, static_cast<int>(style()->columnCount()));
+
+    if (style()->hasAutoColumnWidth()) {
+        if ((colCount - 1) * colGap < availWidth) {
+            desiredColumnCount = colCount;
+            desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;
+        } else if (colGap < availWidth) {
+            desiredColumnCount = availWidth / colGap;
+            desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;
+        }
+    } else if (style()->hasAutoColumnCount()) {
+        if (colWidth < availWidth) {
+            desiredColumnCount = (availWidth + colGap) / (colWidth + colGap);
+            desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;
+        }
+    } else {
+        // Both are set.
+        if (colCount * colWidth + (colCount - 1) * colGap <= availWidth) {
+            desiredColumnCount = colCount;
+            desiredColumnWidth = colWidth;
+        } else if (colWidth < availWidth) {
+            desiredColumnCount = (availWidth + colGap) / (colWidth + colGap);
+            desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;
+        }
+    }
+    setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth);
+}
+
+void RenderBlock::setDesiredColumnCountAndWidth(int count, int width)
+{
+    if (count == 1) {
+        if (m_hasColumns) {
+            delete gColumnInfoMap->take(this);
+            m_hasColumns = false;
+        }
+    } else {
+        ColumnInfo* info;
+        if (m_hasColumns)
+            info = gColumnInfoMap->get(this);
+        else {
+            if (!gColumnInfoMap)
+                gColumnInfoMap = new ColumnInfoMap;
+            info = new ColumnInfo;
+            gColumnInfoMap->add(this, info);
+            m_hasColumns = true;
+        }
+        info->m_desiredColumnCount = count;
+        info->m_desiredColumnWidth = width;   
+    }
+}
+
+int RenderBlock::desiredColumnWidth() const
+{
+    if (!m_hasColumns)
+        return contentWidth();
+    return gColumnInfoMap->get(this)->m_desiredColumnWidth;
+}
+
+unsigned RenderBlock::desiredColumnCount() const
+{
+    if (!m_hasColumns)
+        return 1;
+    return gColumnInfoMap->get(this)->m_desiredColumnCount;
+}
+
+Vector<IntRect>* RenderBlock::columnRects() const
+{
+    if (!m_hasColumns)
+        return 0;
+    return &gColumnInfoMap->get(this)->m_columnRects;    
+}
+
+int RenderBlock::layoutColumns(int endOfContent)
+{
+    // Don't do anything if we have no columns
+    if (!m_hasColumns)
+        return -1;
+
+    ColumnInfo* info = gColumnInfoMap->get(this);
+    int desiredColumnWidth = info->m_desiredColumnWidth;
+    int desiredColumnCount = info->m_desiredColumnCount;
+    Vector<IntRect>* columnRects = &info->m_columnRects;
+    
+    bool computeIntrinsicHeight = (endOfContent == -1);
+
+    // Fill the columns in to the available height.  Attempt to balance the height of the columns
+    int availableHeight = contentHeight();
+    int colHeight = computeIntrinsicHeight ? availableHeight / desiredColumnCount : availableHeight;
+    
+    // Add in half our line-height to help with best-guess initial balancing.
+    int columnSlop = lineHeight(false) / 2;
+    int remainingSlopSpace = columnSlop * desiredColumnCount;
+
+    if (computeIntrinsicHeight)
+        colHeight += columnSlop;
+                                                                            
+    int colGap = columnGap();
+
+    // Compute a collection of column rects.
+    columnRects->clear();
+    
+    // Then we do a simulated "paint" into the column slices and allow the content to slightly adjust our individual column rects.
+    // FIXME: We need to take into account layers that are affected by the columns as well here so that they can have an opportunity
+    // to adjust column rects also.
+    RenderView* v = view();
+    int left = borderLeft() + paddingLeft();
+    int top = borderTop() + paddingTop();
+    int currX = style()->direction() == LTR ? borderLeft() + paddingLeft() : borderLeft() + paddingLeft() + contentWidth() - desiredColumnWidth;
+    int currY = top;
+    unsigned colCount = desiredColumnCount;
+    int maxColBottom = borderTop() + paddingTop();
+    int contentBottom = top + availableHeight; 
+    for (unsigned i = 0; i < colCount; i++) {
+        // If we aren't constrained, then the last column can just get all the remaining space.
+        if (computeIntrinsicHeight && i == colCount - 1)
+            colHeight = availableHeight;
+
+        // This represents the real column position.
+        IntRect colRect(currX, top, desiredColumnWidth, colHeight);
+        
+        // For the simulated paint, we pretend like everything is in one long strip.
+        IntRect pageRect(left, currY, desiredColumnWidth, colHeight);
+        v->setPrintRect(pageRect);
+        v->setTruncatedAt(currY + colHeight);
+        GraphicsContext context((PlatformGraphicsContext*)0);
+        RenderObject::PaintInfo paintInfo(&context, pageRect, PaintPhaseForeground, false, 0, 0);
+        
+        m_hasColumns = false;
+        paintObject(paintInfo, 0, 0);
+        m_hasColumns = true;
+
+        int adjustedBottom = v->bestTruncatedAt();
+        if (adjustedBottom <= currY)
+            adjustedBottom = currY + colHeight;
+        
+        colRect.setHeight(adjustedBottom - currY);
+        
+        // Add in the lost space to the subsequent columns.
+        // FIXME: This will create a "staircase" effect if there are enough columns, but the effect should be pretty subtle.
+        if (computeIntrinsicHeight) {
+            int lostSpace = colHeight - colRect.height();
+            if (lostSpace > remainingSlopSpace) {
+                // Redestribute the space among the remaining columns.
+                int spaceToRedistribute = lostSpace - remainingSlopSpace;
+                int remainingColumns = colCount - i + 1;
+                colHeight += spaceToRedistribute / remainingColumns;
+            } 
+            remainingSlopSpace = max(0, remainingSlopSpace - lostSpace);
+        }
+        
+        if (style()->direction() == LTR)
+            currX += desiredColumnWidth + colGap;
+        else
+            currX -= (desiredColumnWidth + colGap);
+
+        currY += colRect.height();
+        availableHeight -= colRect.height();
+
+        maxColBottom = max(colRect.bottom(), maxColBottom);
+
+        columnRects->append(colRect);
+        
+        // Start adding in more columns as long as there's still content left.
+        if (currY < endOfContent && i == colCount - 1)
+            colCount++;
+    }
+
+    m_overflowWidth = max(m_width, currX - colGap);
+    m_overflowLeft = min(0, currX + desiredColumnWidth + colGap);
+
+    m_overflowHeight = maxColBottom;
+    int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight();
+        
+    if (computeIntrinsicHeight)
+        m_height = m_overflowHeight + toAdd;
+
+    v->setPrintRect(IntRect());
+    v->setTruncatedAt(0);
+    
+    ASSERT(colCount == columnRects->size());
+    
+    return contentBottom;
+}
+
+void RenderBlock::adjustPointToColumnContents(IntPoint& point) const
+{
+    // Just bail if we have no columns.
+    if (!m_hasColumns)
+        return;
+    
+    Vector<IntRect>* colRects = columnRects();
+
+    // Determine which columns we intersect.
+    int colGap = columnGap();
+    int leftGap = colGap / 2;
+    IntPoint columnPoint(colRects->at(0).location());
+    int yOffset = 0;
+    for (unsigned i = 0; i < colRects->size(); i++) {
+        // Add in half the column gap to the left and right of the rect.
+        IntRect colRect = colRects->at(i);
+        IntRect gapAndColumnRect(colRect.x() - leftGap, colRect.y(), colRect.width() + colGap, colRect.height());
+        
+        if (gapAndColumnRect.contains(point)) {
+            // We're inside the column.  Translate the x and y into our column coordinate space.
+            point.move(columnPoint.x() - colRect.x(), yOffset);
+            return;
+        }
+
+        // Move to the next position.
+        yOffset += colRect.height();
+    }
+}
+
+void RenderBlock::adjustRectForColumns(IntRect& r) const
+{
+    // Just bail if we have no columns.
+    if (!m_hasColumns)
+        return;
+    
+    Vector<IntRect>* colRects = columnRects();
+
+    // Begin with a result rect that is empty.
+    IntRect result;
+    
+    // Determine which columns we intersect.
+    int currXOffset = 0;
+    int currYOffset = 0;
+    int colGap = columnGap();
+    for (unsigned i = 0; i < colRects->size(); i++) {
+        IntRect colRect = colRects->at(i);
+        
+        IntRect repaintRect = r;
+        repaintRect.move(currXOffset, currYOffset);
+        
+        repaintRect.intersect(colRect);
+        
+        result.unite(repaintRect);
+
+        // Move to the next position.
+        if (style()->direction() == LTR)
+            currXOffset += colRect.width() + colGap;
+        else
+            currXOffset -= (colRect.width() + colGap);
+
+        currYOffset -= colRect.height();
+    }
+
+    r = result;
+}
+
+void RenderBlock::calcPrefWidths()
+{
+    ASSERT(prefWidthsDirty());
+
+    updateFirstLetter();
+
+    if (!isTableCell() && style()->width().isFixed() && style()->width().value() > 0)
+        m_minPrefWidth = m_maxPrefWidth = calcContentBoxWidth(style()->width().value());
+    else {
+        m_minPrefWidth = 0;
+        m_maxPrefWidth = 0;
+
+        if (childrenInline())
+            calcInlinePrefWidths();
+        else
+            calcBlockPrefWidths();
+
+        m_maxPrefWidth = max(m_minPrefWidth, m_maxPrefWidth);
+
+        if (!style()->autoWrap() && childrenInline()) {
+            m_minPrefWidth = m_maxPrefWidth;
+            
+            // A horizontal marquee with inline children has no minimum width.
+            if (m_layer && m_layer->marquee() && m_layer->marquee()->isHorizontal())
+                m_minPrefWidth = 0;
+        }
+
+        if (isTableCell()) {
+            Length w = static_cast<const RenderTableCell*>(this)->styleOrColWidth();
+            if (w.isFixed() && w.value() > 0)
+                m_maxPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(w.value()));
+        }
+    }
+    
+    if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {
+        m_maxPrefWidth = max(m_maxPrefWidth, calcContentBoxWidth(style()->minWidth().value()));
+        m_minPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(style()->minWidth().value()));
+    }
+    
+    if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {
+        m_maxPrefWidth = min(m_maxPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));
+        m_minPrefWidth = min(m_minPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));
+    }
+
+    int toAdd = 0;
+    toAdd = borderLeft() + borderRight() + paddingLeft() + paddingRight();
+
+    m_minPrefWidth += toAdd;
+    m_maxPrefWidth += toAdd;
+
+    setPrefWidthsDirty(false);
+}
+
+struct InlineMinMaxIterator
+{
+/* InlineMinMaxIterator is a class that will iterate over all render objects that contribute to
+   inline min/max width calculations.  Note the following about the way it walks:
+   (1) Positioned content is skipped (since it does not contribute to min/max width of a block)
+   (2) We do not drill into the children of floats or replaced elements, since you can't break
+       in the middle of such an element.
+   (3) Inline flows (e.g., <a>, <span>, <i>) are walked twice, since each side can have
+       distinct borders/margin/padding that contribute to the min/max width.
+*/
+    RenderObject* parent;
+    RenderObject* current;
+    bool endOfInline;
+
+    InlineMinMaxIterator(RenderObject* p, bool end = false)
+        :parent(p), current(p), endOfInline(end) {}
+
+    RenderObject* next();
+};
+
+RenderObject* InlineMinMaxIterator::next()
+{
+    RenderObject* result = 0;
+    bool oldEndOfInline = endOfInline;
+    endOfInline = false;
+    while (current || current == parent) {
+        if (!oldEndOfInline &&
+            (current == parent ||
+             (!current->isFloating() && !current->isReplaced() && !current->isPositioned())))
+            result = current->firstChild();
+        if (!result) {
+            // We hit the end of our inline. (It was empty, e.g., <span></span>.)
+            if (!oldEndOfInline && current->isInlineFlow()) {
+                result = current;
+                endOfInline = true;
+                break;
+            }
+
+            while (current && current != parent) {
+                result = current->nextSibling();
+                if (result) break;
+                current = current->parent();
+                if (current && current != parent && current->isInlineFlow()) {
+                    result = current;
+                    endOfInline = true;
+                    break;
+                }
+            }
+        }
+
+        if (!result)
+            break;
+
+        if (!result->isPositioned() && (result->isText() || result->isFloating() || result->isReplaced() || result->isInlineFlow()))
+             break;
+        
+        current = result;
+        result = 0;
+    }
+
+    // Update our position.
+    current = result;
+    return current;
+}
+
+static int getBPMWidth(int childValue, Length cssUnit)
+{
+    if (cssUnit.type() != Auto)
+        return (cssUnit.isFixed() ? cssUnit.value() : childValue);
+    return 0;
+}
+
+static int getBorderPaddingMargin(const RenderObject* child, bool endOfInline)
+{
+    RenderStyle* cstyle = child->style();
+    int result = 0;
+    bool leftSide = (cstyle->direction() == LTR) ? !endOfInline : endOfInline;
+    result += getBPMWidth((leftSide ? child->marginLeft() : child->marginRight()),
+                          (leftSide ? cstyle->marginLeft() :
+                                      cstyle->marginRight()));
+    result += getBPMWidth((leftSide ? child->paddingLeft() : child->paddingRight()),
+                          (leftSide ? cstyle->paddingLeft() :
+                                      cstyle->paddingRight()));
+    result += leftSide ? child->borderLeft() : child->borderRight();
+    return result;
+}
+
+static inline void stripTrailingSpace(int& inlineMax, int& inlineMin,
+                                      RenderObject* trailingSpaceChild)
+{
+    if (trailingSpaceChild && trailingSpaceChild->isText()) {
+        // Collapse away the trailing space at the end of a block.
+        RenderText* t = static_cast<RenderText*>(trailingSpaceChild);
+        const UChar space = ' ';
+        const Font& font = t->style()->font(); // FIXME: This ignores first-line.
+        int spaceWidth = font.width(TextRun(&space, 1));
+        inlineMax -= spaceWidth + font.wordSpacing();
+        if (inlineMin > inlineMax)
+            inlineMin = inlineMax;
+    }
+}
+
+void RenderBlock::calcInlinePrefWidths()
+{
+    int inlineMax = 0;
+    int inlineMin = 0;
+
+    int cw = containingBlock()->contentWidth();
+
+    // If we are at the start of a line, we want to ignore all white-space.
+    // Also strip spaces if we previously had text that ended in a trailing space.
+    bool stripFrontSpaces = true;
+    RenderObject* trailingSpaceChild = 0;
+
+    // Firefox and Opera will allow a table cell to grow to fit an image inside it under
+    // very specific cirucumstances (in order to match common WinIE renderings). 
+    // Not supporting the quirk has caused us to mis-render some real sites. (See Bugzilla 10517.) 
+    bool allowImagesToBreak = !style()->htmlHacks() || !isTableCell() || !style()->width().isIntrinsicOrAuto();
+
+    bool autoWrap, oldAutoWrap;
+    autoWrap = oldAutoWrap = style()->autoWrap();
+
+    InlineMinMaxIterator childIterator(this);
+    bool addedTextIndent = false; // Only gets added in once.
+    RenderObject* prevFloat = 0;
+    RenderObject* previousLeaf = 0;
+    while (RenderObject* child = childIterator.next()) {
+        autoWrap = child->isReplaced() ? child->parent()->style()->autoWrap() : 
+            child->style()->autoWrap();
+
+        if (!child->isBR()) {
+            // Step One: determine whether or not we need to go ahead and
+            // terminate our current line.  Each discrete chunk can become
+            // the new min-width, if it is the widest chunk seen so far, and
+            // it can also become the max-width.
+
+            // Children fall into three categories:
+            // (1) An inline flow object.  These objects always have a min/max of 0,
+            // and are included in the iteration solely so that their margins can
+            // be added in.
+            //
+            // (2) An inline non-text non-flow object, e.g., an inline replaced element.
+            // These objects can always be on a line by themselves, so in this situation
+            // we need to go ahead and break the current line, and then add in our own
+            // margins and min/max width on its own line, and then terminate the line.
+            //
+            // (3) A text object.  Text runs can have breakable characters at the start,
+            // the middle or the end.  They may also lose whitespace off the front if
+            // we're already ignoring whitespace.  In order to compute accurate min-width
+            // information, we need three pieces of information.
+            // (a) the min-width of the first non-breakable run.  Should be 0 if the text string
+            // starts with whitespace.
+            // (b) the min-width of the last non-breakable run. Should be 0 if the text string
+            // ends with whitespace.
+            // (c) the min/max width of the string (trimmed for whitespace).
+            //
+            // If the text string starts with whitespace, then we need to go ahead and
+            // terminate our current line (unless we're already in a whitespace stripping
+            // mode.
+            //
+            // If the text string has a breakable character in the middle, but didn't start
+            // with whitespace, then we add the width of the first non-breakable run and
+            // then end the current line.  We then need to use the intermediate min/max width
+            // values (if any of them are larger than our current min/max).  We then look at
+            // the width of the last non-breakable run and use that to start a new line
+            // (unless we end in whitespace).
+            RenderStyle* cstyle = child->style();
+            int childMin = 0;
+            int childMax = 0;
+
+            if (!child->isText()) {
+                // Case (1) and (2).  Inline replaced and inline flow elements.
+                if (child->isInlineFlow()) {
+                    // Add in padding/border/margin from the appropriate side of
+                    // the element.
+                    int bpm = getBorderPaddingMargin(child, childIterator.endOfInline);
+                    childMin += bpm;
+                    childMax += bpm;
+
+                    inlineMin += childMin;
+                    inlineMax += childMax;
+                    
+                    child->setPrefWidthsDirty(false);
+                } else {
+                    // Inline replaced elts add in their margins to their min/max values.
+                    int margins = 0;
+                    Length leftMargin = cstyle->marginLeft();
+                    Length rightMargin = cstyle->marginRight();
+                    if (leftMargin.isFixed())
+                        margins += leftMargin.value();
+                    if (rightMargin.isFixed())
+                        margins += rightMargin.value();
+                    childMin += margins;
+                    childMax += margins;
+                }
+            }
+
+            if (!child->isRenderInline() && !child->isText()) {
+                // Case (2). Inline replaced elements and floats.
+                // Go ahead and terminate the current line as far as
+                // minwidth is concerned.
+                childMin += child->minPrefWidth();
+                childMax += child->maxPrefWidth();
+
+                bool clearPreviousFloat;
+                if (child->isFloating()) {
+                    clearPreviousFloat = (prevFloat
+                        && (prevFloat->style()->floating() == FLEFT && (child->style()->clear() & CLEFT)
+                            || prevFloat->style()->floating() == FRIGHT && (child->style()->clear() & CRIGHT)));
+                    prevFloat = child;
+                } else
+                    clearPreviousFloat = false;
+
+                bool canBreakReplacedElement = !child->isImage() || allowImagesToBreak;
+                if (canBreakReplacedElement && (autoWrap || oldAutoWrap) || clearPreviousFloat) {
+                    m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+                    inlineMin = 0;
+                }
+
+                // If we're supposed to clear the previous float, then terminate maxwidth as well.
+                if (clearPreviousFloat) {
+                    m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);
+                    inlineMax = 0;
+                }
+
+                // Add in text-indent.  This is added in only once.
+                int ti = 0;
+                if (!addedTextIndent) {
+                    addedTextIndent = true;
+                    ti = style()->textIndent().calcMinValue(cw);
+                    childMin+=ti;
+                    childMax+=ti;
+                }
+
+                // Add our width to the max.
+                inlineMax += childMax;
+
+                if (!autoWrap || !canBreakReplacedElement)
+                    inlineMin += childMin;
+                else
+                    inlineMin = childMin;
+
+                if (autoWrap && canBreakReplacedElement) {
+                    // Now check our line.
+                    m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+
+                    // Now start a new line.
+                    inlineMin = 0;
+                }
+
+                // We are no longer stripping whitespace at the start of
+                // a line.
+                if (!child->isFloating()) {
+                    stripFrontSpaces = false;
+                    trailingSpaceChild = 0;
+                }
+            } else if (child->isText()) {
+                // Case (3). Text.
+                RenderText* t = static_cast<RenderText *>(child);
+
+                if (t->isWordBreak()) {
+                    m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+                    inlineMin = 0;
+                    continue;
+                }
+
+                // Determine if we have a breakable character.  Pass in
+                // whether or not we should ignore any spaces at the front
+                // of the string.  If those are going to be stripped out,
+                // then they shouldn't be considered in the breakable char
+                // check.
+                bool hasBreakableChar, hasBreak;
+                int beginMin, endMin;
+                bool beginWS, endWS;
+                int beginMax, endMax;
+                t->trimmedPrefWidths(inlineMax, beginMin, beginWS, endMin, endWS,
+                                     hasBreakableChar, hasBreak, beginMax, endMax,
+                                     childMin, childMax, stripFrontSpaces);
+
+                // This text object will not be rendered, but it may still provide a breaking opportunity.
+                if (!hasBreak && childMax == 0) {
+                    if (autoWrap && (beginWS || endWS)) {
+                        m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+                        inlineMin = 0;
+                    }
+                    continue;
+                }
+                
+                if (stripFrontSpaces)
+                    trailingSpaceChild = child;
+                else
+                    trailingSpaceChild = 0;
+
+                // Add in text-indent.  This is added in only once.
+                int ti = 0;
+                if (!addedTextIndent) {
+                    addedTextIndent = true;
+                    ti = style()->textIndent().calcMinValue(cw);
+                    childMin+=ti; beginMin += ti;
+                    childMax+=ti; beginMax += ti;
+                }
+                
+                // If we have no breakable characters at all,
+                // then this is the easy case. We add ourselves to the current
+                // min and max and continue.
+                if (!hasBreakableChar) {
+                    inlineMin += childMin;
+                } else {
+                    // We have a breakable character.  Now we need to know if
+                    // we start and end with whitespace.
+                    if (beginWS)
+                        // Go ahead and end the current line.
+                        m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+                    else {
+                        inlineMin += beginMin;
+                        m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+                        childMin -= ti;
+                    }
+
+                    inlineMin = childMin;
+
+                    if (endWS) {
+                        // We end in whitespace, which means we can go ahead
+                        // and end our current line.
+                        m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+                        inlineMin = 0;
+                    } else {
+                        m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+                        inlineMin = endMin;
+                    }
+                }
+
+                if (hasBreak) {
+                    inlineMax += beginMax;
+                    m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);
+                    m_maxPrefWidth = max(childMax, m_maxPrefWidth);
+                    inlineMax = endMax;
+                } else
+                    inlineMax += childMax;
+            }
+        } else {
+            m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+            m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);
+            inlineMin = inlineMax = 0;
+            stripFrontSpaces = true;
+            trailingSpaceChild = 0;
+        }
+
+        oldAutoWrap = autoWrap;
+        if (!child->isInlineFlow())
+            previousLeaf = child;
+    }
+
+    if (style()->collapseWhiteSpace())
+        stripTrailingSpace(inlineMax, inlineMin, trailingSpaceChild);
+
+    m_minPrefWidth = max(inlineMin, m_minPrefWidth);
+    m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);
+}
+
+// Use a very large value (in effect infinite).
+#define BLOCK_MAX_WIDTH 15000
+
+void RenderBlock::calcBlockPrefWidths()
+{
+    bool nowrap = style()->whiteSpace() == NOWRAP;
+
+    RenderObject *child = firstChild();
+    int floatLeftWidth = 0, floatRightWidth = 0;
+    while (child) {
+        // Positioned children don't affect the min/max width
+        if (child->isPositioned()) {
+            child = child->nextSibling();
+            continue;
+        }
+
+        if (child->isFloating() || child->avoidsFloats()) {
+            int floatTotalWidth = floatLeftWidth + floatRightWidth;
+            if (child->style()->clear() & CLEFT) {
+                m_maxPrefWidth = max(floatTotalWidth, m_maxPrefWidth);
+                floatLeftWidth = 0;
+            }
+            if (child->style()->clear() & CRIGHT) {
+                m_maxPrefWidth = max(floatTotalWidth, m_maxPrefWidth);
+                floatRightWidth = 0;
+            }
+        }
+
+        // A margin basically has three types: fixed, percentage, and auto (variable).
+        // Auto and percentage margins simply become 0 when computing min/max width.
+        // Fixed margins can be added in as is.
+        Length ml = child->style()->marginLeft();
+        Length mr = child->style()->marginRight();
+        int margin = 0, marginLeft = 0, marginRight = 0;
+        if (ml.isFixed())
+            marginLeft += ml.value();
+        if (mr.isFixed())
+            marginRight += mr.value();
+        margin = marginLeft + marginRight;
+
+        int w = child->minPrefWidth() + margin;
+        m_minPrefWidth = max(w, m_minPrefWidth);
+        
+        // IE ignores tables for calculation of nowrap. Makes some sense.
+        if (nowrap && !child->isTable())
+            m_maxPrefWidth = max(w, m_maxPrefWidth);
+
+        w = child->maxPrefWidth() + margin;
+
+        if (!child->isFloating()) {
+            if (child->avoidsFloats()) {
+                // Determine a left and right max value based off whether or not the floats can fit in the
+                // margins of the object.  For negative margins, we will attempt to overlap the float if the negative margin
+                // is smaller than the float width.
+                int maxLeft = marginLeft > 0 ? max(floatLeftWidth, marginLeft) : floatLeftWidth + marginLeft;
+                int maxRight = marginRight > 0 ? max(floatRightWidth, marginRight) : floatRightWidth + marginRight;
+                w = child->maxPrefWidth() + maxLeft + maxRight;
+                w = max(w, floatLeftWidth + floatRightWidth);
+            }
+            else
+                m_maxPrefWidth = max(floatLeftWidth + floatRightWidth, m_maxPrefWidth);
+            floatLeftWidth = floatRightWidth = 0;
+        }
+        
+        if (child->isFloating()) {
+            if (style()->floating() == FLEFT)
+                floatLeftWidth += w;
+            else
+                floatRightWidth += w;
+        } else
+            m_maxPrefWidth = max(w, m_maxPrefWidth);
+
+        // A very specific WinIE quirk.
+        // Example:
+        /*
+           <div style="position:absolute; width:100px; top:50px;">
+              <div style="position:absolute;left:0px;top:50px;height:50px;background-color:green">
+                <table style="width:100%"><tr><td></table>
+              </div>
+           </div>
+        */
+        // In the above example, the inner absolute positioned block should have a computed width
+        // of 100px because of the table.
+        // We can achieve this effect by making the maxwidth of blocks that contain tables
+        // with percentage widths be infinite (as long as they are not inside a table cell).
+        if (style()->htmlHacks() && child->style()->width().isPercent() &&
+            !isTableCell() && child->isTable() && m_maxPrefWidth < BLOCK_MAX_WIDTH) {
+            RenderBlock* cb = containingBlock();
+            while (!cb->isRenderView() && !cb->isTableCell())
+                cb = cb->containingBlock();
+            if (!cb->isTableCell())
+                m_maxPrefWidth = BLOCK_MAX_WIDTH;
+        }
+        
+        child = child->nextSibling();
+    }
+
+    // Always make sure these values are non-negative.
+    m_minPrefWidth = max(0, m_minPrefWidth);
+    m_maxPrefWidth = max(0, m_maxPrefWidth);
+
+    m_maxPrefWidth = max(floatLeftWidth + floatRightWidth, m_maxPrefWidth);
+}
+
+bool RenderBlock::hasLineIfEmpty() const
+{
+    return element() && (element()->isContentEditable() && element()->rootEditableElement() == element() ||
+                         element()->isShadowNode() && element()->shadowParentNode()->hasTagName(inputTag));
+}
+
+short RenderBlock::lineHeight(bool b, bool isRootLineBox) const
+{
+    // Inline blocks are replaced elements. Otherwise, just pass off to
+    // the base class.  If we're being queried as though we're the root line
+    // box, then the fact that we're an inline-block is irrelevant, and we behave
+    // just like a block.
+    if (isReplaced() && !isRootLineBox)
+        return height()+marginTop()+marginBottom();
+    return RenderFlow::lineHeight(b, isRootLineBox);
+}
+
+short RenderBlock::baselinePosition(bool b, bool isRootLineBox) const
+{
+    // Inline blocks are replaced elements. Otherwise, just pass off to
+    // the base class.  If we're being queried as though we're the root line
+    // box, then the fact that we're an inline-block is irrelevant, and we behave
+    // just like a block.
+    if (isReplaced() && !isRootLineBox) {
+        // For "leaf" theme objects, let the theme decide what the baseline position is.
+        // FIXME: Might be better to have a custom CSS property instead, so that if the theme
+        // is turned off, checkboxes/radios will still have decent baselines.
+        if (style()->hasAppearance() && !theme()->isControlContainer(style()->appearance()))
+            return theme()->baselinePosition(this);
+            
+        // CSS2.1 states that the baseline of an inline block is the baseline of the last line box in
+        // the normal flow.  We make an exception for marquees, since their baselines are meaningless
+        // (the content inside them moves).  This matches WinIE as well, which just bottom-aligns them.
+        // We also give up on finding a baseline if we have a vertical scrollbar, or if we are scrolled
+        // vertically (e.g., an overflow:hidden block that has had scrollTop moved) or if the baseline is outside
+        // of our content box.
+        int baselinePos = (m_layer && (m_layer->marquee() || m_layer->verticalScrollbar() || m_layer->scrollYOffset() != 0)) ? -1 : getBaselineOfLastLineBox();
+        if (baselinePos != -1 && baselinePos <= borderTop() + paddingTop() + contentHeight())
+            return marginTop() + baselinePos;
+        return height() + marginTop() + marginBottom();
+    }
+    return RenderFlow::baselinePosition(b, isRootLineBox);
+}
+
+int RenderBlock::getBaselineOfFirstLineBox() const
+{
+    if (!isBlockFlow())
+        return RenderFlow::getBaselineOfFirstLineBox();
+
+    if (childrenInline()) {
+        if (firstLineBox())
+            return firstLineBox()->yPos() + firstLineBox()->baseline();
+        else
+            return -1;
+    }
+    else {
+        for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling()) {
+            if (!curr->isFloatingOrPositioned()) {
+                int result = curr->getBaselineOfFirstLineBox();
+                if (result != -1)
+                    return curr->yPos() + result; // Translate to our coordinate space.
+            }
+        }
+    }
+
+    return -1;
+}
+
+int RenderBlock::getBaselineOfLastLineBox() const
+{
+    if (!isBlockFlow())
+        return RenderFlow::getBaselineOfLastLineBox();
+
+    if (childrenInline()) {
+        if (!firstLineBox() && hasLineIfEmpty())
+            return RenderFlow::baselinePosition(true, true) + borderTop() + paddingTop();
+        if (lastLineBox())
+            return lastLineBox()->yPos() + lastLineBox()->baseline();
+        return -1;
+    }
+    else {
+        bool haveNormalFlowChild = false;
+        for (RenderObject* curr = lastChild(); curr; curr = curr->previousSibling()) {
+            if (!curr->isFloatingOrPositioned()) {
+                haveNormalFlowChild = true;
+                int result = curr->getBaselineOfLastLineBox();
+                if (result != -1)
+                    return curr->yPos() + result; // Translate to our coordinate space.
+            }
+        }
+        if (!haveNormalFlowChild && hasLineIfEmpty())
+            return RenderFlow::baselinePosition(true, true) + borderTop() + paddingTop();
+    }
+
+    return -1;
+}
+
+RenderBlock* RenderBlock::firstLineBlock() const
+{
+    const RenderObject* firstLineBlock = this;
+    bool hasPseudo = false;
+    while (true) {
+        hasPseudo = firstLineBlock->style()->hasPseudoStyle(RenderStyle::FIRST_LINE);
+        if (hasPseudo)
+            break;
+        RenderObject* parentBlock = firstLineBlock->parent();
+        if (firstLineBlock->isReplaced() || firstLineBlock->isFloating() || 
+            !parentBlock || parentBlock->firstChild() != firstLineBlock || !parentBlock->isBlockFlow())
+            break;
+        firstLineBlock = parentBlock;
+    } 
+    
+    if (!hasPseudo)
+        return 0;
+    
+    return (RenderBlock*)(firstLineBlock);
+}
+
+void RenderBlock::updateFirstLetter()
+{
+    if (!document()->usesFirstLetterRules())
+        return;
+    // Don't recurse
+    if (style()->styleType() == RenderStyle::FIRST_LETTER)
+        return;
+
+    // FIXME: We need to destroy the first-letter object if it is no longer the first child.  Need to find
+    // an efficient way to check for that situation though before implementing anything.
+    RenderObject* firstLetterBlock = this;
+    bool hasPseudoStyle = false;
+    while (true) {
+        // We only honor first-letter if the firstLetterBlock can have children in the DOM. This correctly 
+        // prevents form controls from honoring first-letter.
+        hasPseudoStyle = firstLetterBlock->style()->hasPseudoStyle(RenderStyle::FIRST_LETTER) 
+            && firstLetterBlock->canHaveChildren();
+        if (hasPseudoStyle)
+            break;
+        RenderObject* parentBlock = firstLetterBlock->parent();
+        if (firstLetterBlock->isReplaced() || !parentBlock || parentBlock->firstChild() != firstLetterBlock || 
+            !parentBlock->isBlockFlow())
+            break;
+        firstLetterBlock = parentBlock;
+    } 
+
+    if (!hasPseudoStyle) 
+        return;
+    
+    // Drill into inlines looking for our first text child.
+    RenderObject* currChild = firstLetterBlock->firstChild();
+    while (currChild && currChild->needsLayout() && !currChild->isReplaced() && !currChild->isText()) 
+        currChild = currChild->firstChild();
+
+    // Get list markers out of the way.
+    while (currChild && currChild->isListMarker())
+        currChild = currChild->nextSibling();
+    
+    if (!currChild)
+        return;
+    
+    RenderObject* firstLetterContainer = currChild->parent();
+
+    // If the child already has style, then it has already been created, so we just want
+    // to update it.
+    if (currChild->style()->styleType() == RenderStyle::FIRST_LETTER) {
+        RenderStyle* pseudo = firstLetterBlock->getPseudoStyle(RenderStyle::FIRST_LETTER,
+                                                               firstLetterContainer->firstLineStyle());
+        currChild->setStyle(pseudo);
+        for (RenderObject* genChild = currChild->firstChild(); genChild; genChild = genChild->nextSibling()) {
+            if (genChild->isText()) 
+                genChild->setStyle(pseudo);
+        }
+        return;
+    }
+
+    // If the child does not already have style, we create it here.
+    if (currChild->isText() && !currChild->isBR() && currChild->parent()->style()->styleType() != RenderStyle::FIRST_LETTER) {
+        // Our layout state is not valid for the repaints we are going to trigger by
+        // adding and removing children of firstLetterContainer.
+        view()->disableLayoutState();
+
+        RenderText* textObj = static_cast<RenderText*>(currChild);
+        
+        // Create our pseudo style now that we have our firstLetterContainer determined.
+        RenderStyle* pseudoStyle = firstLetterBlock->getPseudoStyle(RenderStyle::FIRST_LETTER,
+                                                                    firstLetterContainer->firstLineStyle());
+        
+        // Force inline display (except for floating first-letters)
+        pseudoStyle->setDisplay( pseudoStyle->isFloating() ? BLOCK : INLINE);
+        pseudoStyle->setPosition( StaticPosition ); // CSS2 says first-letter can't be positioned.
+        
+        RenderObject* firstLetter = RenderFlow::createAnonymousFlow(document(), pseudoStyle); // anonymous box
+        // FIXME: This adds in the wrong place if list markers were skipped above.  Should be
+        // firstLetterContainer->addChild(firstLetter, currChild);
+        firstLetterContainer->addChild(firstLetter, firstLetterContainer->firstChild());
+        
+        // The original string is going to be either a generated content string or a DOM node's
+        // string.  We want the original string before it got transformed in case first-letter has
+        // no text-transform or a different text-transform applied to it.
+        RefPtr<StringImpl> oldText = textObj->originalText();
+        ASSERT(oldText);
+        
+        if (oldText && oldText->length() > 0) {
+            unsigned int length = 0;
+            
+            // account for leading spaces and punctuation
+            while (length < oldText->length() && (isSpaceOrNewline((*oldText)[length]) || Unicode::isPunct((*oldText)[length])))
+                length++;
+            
+            // account for first letter
+            length++;
+            
+            // construct text fragment for the text after the first letter
+            // NOTE: this might empty
+            RenderTextFragment* remainingText = 
+                new (renderArena()) RenderTextFragment(textObj->node(), oldText.get(), length, oldText->length() - length);
+            remainingText->setStyle(textObj->style());
+            if (remainingText->element())
+                remainingText->element()->setRenderer(remainingText);
+            
+            RenderObject* nextObj = textObj->nextSibling();
+            firstLetterContainer->removeChild(textObj);
+            firstLetterContainer->addChild(remainingText, nextObj);
+            remainingText->setFirstLetter(firstLetter);
+            
+            // construct text fragment for the first letter
+            RenderTextFragment* letter = 
+                new (renderArena()) RenderTextFragment(remainingText->node(), oldText.get(), 0, length);
+            RenderStyle* newStyle = new (renderArena()) RenderStyle();
+            newStyle->inheritFrom(pseudoStyle);
+            letter->setStyle(newStyle);
+            firstLetter->addChild(letter);
+
+            textObj->destroy();
+        }
+        view()->enableLayoutState();
+    }
+}
+
+bool RenderBlock::inRootBlockContext() const
+{
+    if (isTableCell() || isFloatingOrPositioned() || hasOverflowClip())
+        return false;
+    
+    if (isRoot() || isRenderView())
+        return true;
+    
+    return containingBlock()->inRootBlockContext();
+}
+
+// Helper methods for obtaining the last line, computing line counts and heights for line counts
+// (crawling into blocks).
+static bool shouldCheckLines(RenderObject* obj)
+{
+    return !obj->isFloatingOrPositioned() && !obj->isCompact() && !obj->isRunIn() &&
+            obj->isBlockFlow() && obj->style()->height().isAuto() &&
+            (!obj->isFlexibleBox() || obj->style()->boxOrient() == VERTICAL);
+}
+
+static RootInlineBox* getLineAtIndex(RenderBlock* block, int i, int& count)
+{
+    if (block->style()->visibility() == VISIBLE) {
+        if (block->childrenInline()) {
+            for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) {
+                if (count++ == i)
+                    return box;
+            }
+        }
+        else {
+            for (RenderObject* obj = block->firstChild(); obj; obj = obj->nextSibling()) {
+                if (shouldCheckLines(obj)) {
+                    RootInlineBox *box = getLineAtIndex(static_cast<RenderBlock*>(obj), i, count);
+                    if (box)
+                        return box;
+                }
+            }
+        }
+    }
+    return 0;
+}
+
+int getHeightForLineCount(RenderBlock* block, int l, bool includeBottom, int& count)
+{
+    if (block->style()->visibility() == VISIBLE) {
+        if (block->childrenInline()) {
+            for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) {
+                if (++count == l)
+                    return box->bottomOverflow() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : 0);
+            }
+        }
+        else {
+            RenderObject* normalFlowChildWithoutLines = 0;
+            for (RenderObject* obj = block->firstChild(); obj; obj = obj->nextSibling()) {
+                if (shouldCheckLines(obj)) {
+                    int result = getHeightForLineCount(static_cast<RenderBlock*>(obj), l, false, count);
+                    if (result != -1)
+                        return result + obj->yPos() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : 0);
+                }
+                else if (!obj->isFloatingOrPositioned() && !obj->isCompact() && !obj->isRunIn())
+                    normalFlowChildWithoutLines = obj;
+            }
+            if (normalFlowChildWithoutLines && l == 0)
+                return normalFlowChildWithoutLines->yPos() + normalFlowChildWithoutLines->height();
+        }
+    }
+    
+    return -1;
+}
+
+RootInlineBox* RenderBlock::lineAtIndex(int i)
+{
+    int count = 0;
+    return getLineAtIndex(this, i, count);
+}
+
+int RenderBlock::lineCount()
+{
+    int count = 0;
+    if (style()->visibility() == VISIBLE) {
+        if (childrenInline())
+            for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox())
+                count++;
+        else
+            for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling())
+                if (shouldCheckLines(obj))
+                    count += static_cast<RenderBlock*>(obj)->lineCount();
+    }
+    return count;
+}
+
+int RenderBlock::heightForLineCount(int l)
+{
+    int count = 0;
+    return getHeightForLineCount(this, l, true, count);
+}
+
+void RenderBlock::adjustForBorderFit(int x, int& left, int& right) const
+{
+    // We don't deal with relative positioning.  Our assumption is that you shrink to fit the lines without accounting
+    // for either overflow or translations via relative positioning.
+    if (style()->visibility() == VISIBLE) {
+        if (childrenInline()) {
+            for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox()) {
+                if (box->firstChild())
+                    left = min(left, x + box->firstChild()->xPos());
+                if (box->lastChild())
+                    right = max(right, x + box->lastChild()->xPos() + box->lastChild()->width());
+            }
+        }
+        else {
+            for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling()) {
+                if (!obj->isFloatingOrPositioned()) {
+                    if (obj->isBlockFlow() && !obj->hasOverflowClip())
+                        static_cast<RenderBlock*>(obj)->adjustForBorderFit(x + obj->xPos(), left, right);
+                    else if (obj->style()->visibility() == VISIBLE) {
+                        // We are a replaced element or some kind of non-block-flow object.
+                        left = min(left, x + obj->xPos());
+                        right = max(right, x + obj->xPos() + obj->width());
+                    }
+                }
+            }
+        }
+        
+        if (m_floatingObjects) {
+            FloatingObject* r;
+            DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);
+            for (; (r = it.current()); ++it) {
+                // Only examine the object if our noPaint flag isn't set.
+                if (!r->noPaint) {
+                    int floatLeft = r->left - r->node->xPos() + r->node->marginLeft();
+                    int floatRight = floatLeft + r->node->width();
+                    left = min(left, floatLeft);
+                    right = max(right, floatRight);
+                }
+            }
+        }
+    }
+}
+
+void RenderBlock::borderFitAdjust(int& x, int& w) const
+{
+    if (style()->borderFit() == BorderFitBorder)
+        return;
+
+    // Walk any normal flow lines to snugly fit.
+    int left = INT_MAX;
+    int right = INT_MIN;
+    int oldWidth = w;
+    adjustForBorderFit(0, left, right);
+    if (left != INT_MAX) {
+        left -= (borderLeft() + paddingLeft());
+        if (left > 0) {
+            x += left;
+            w -= left;
+        }
+    }
+    if (right != INT_MIN) {
+        right += (borderRight() + paddingRight());
+        if (right < oldWidth)
+            w -= (oldWidth - right);
+    }
+}
+
+void RenderBlock::clearTruncation()
+{
+    if (style()->visibility() == VISIBLE) {
+        if (childrenInline() && hasMarkupTruncation()) {
+            setHasMarkupTruncation(false);
+            for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox())
+                box->clearTruncation();
+        }
+        else
+            for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling())
+                if (shouldCheckLines(obj))
+                    static_cast<RenderBlock*>(obj)->clearTruncation();
+    }
+}
+
+void RenderBlock::setMaxTopMargins(int pos, int neg)
+{
+    if (!m_maxMargin) {
+        if (pos == MaxMargin::topPosDefault(this) && neg == MaxMargin::topNegDefault(this))
+            return;
+        m_maxMargin = new MaxMargin(this);
+    }
+    m_maxMargin->m_topPos = pos;
+    m_maxMargin->m_topNeg = neg;
+}
+
+void RenderBlock::setMaxBottomMargins(int pos, int neg)
+{
+    if (!m_maxMargin) {
+        if (pos == MaxMargin::bottomPosDefault(this) && neg == MaxMargin::bottomNegDefault(this))
+            return;
+        m_maxMargin = new MaxMargin(this);
+    }
+    m_maxMargin->m_bottomPos = pos;
+    m_maxMargin->m_bottomNeg = neg;
+}
+
+const char* RenderBlock::renderName() const
+{
+    if (isBody())
+        return "RenderBody"; // FIXME: Temporary hack until we know that the regression tests pass.
+    
+    if (isFloating())
+        return "RenderBlock (floating)";
+    if (isPositioned())
+        return "RenderBlock (positioned)";
+    if (isAnonymousBlock())
+        return "RenderBlock (anonymous)";
+    else if (isAnonymous())
+        return "RenderBlock (generated)";
+    if (isRelPositioned())
+        return "RenderBlock (relative positioned)";
+    if (isCompact())
+        return "RenderBlock (compact)";
+    if (isRunIn())
+        return "RenderBlock (run-in)";
+    return "RenderBlock";
+}
+
+} // namespace WebCore