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diff --git a/Source/WebCore/editing/DeleteButtonController.cpp b/Source/WebCore/editing/DeleteButtonController.cpp
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+++ b/Source/WebCore/editing/DeleteButtonController.cpp
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+/*
+ * Copyright (C) 2006, 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "DeleteButtonController.h"
+
+#include "CachedImage.h"
+#include "CSSMutableStyleDeclaration.h"
+#include "CSSPrimitiveValue.h"
+#include "CSSPropertyNames.h"
+#include "CSSValueKeywords.h"
+#include "DeleteButton.h"
+#include "Document.h"
+#include "Editor.h"
+#include "Frame.h"
+#include "htmlediting.h"
+#include "HTMLDivElement.h"
+#include "HTMLNames.h"
+#include "Image.h"
+#include "Node.h"
+#include "Range.h"
+#include "RemoveNodeCommand.h"
+#include "RenderBox.h"
+#include "SelectionController.h"
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+const char* const DeleteButtonController::containerElementIdentifier = "WebKit-Editing-Delete-Container";
+const char* const DeleteButtonController::buttonElementIdentifier = "WebKit-Editing-Delete-Button";
+const char* const DeleteButtonController::outlineElementIdentifier = "WebKit-Editing-Delete-Outline";
+
+DeleteButtonController::DeleteButtonController(Frame* frame)
+    : m_frame(frame)
+    , m_wasStaticPositioned(false)
+    , m_wasAutoZIndex(false)
+    , m_disableStack(0)
+{
+}
+
+static bool isDeletableElement(const Node* node)
+{
+    if (!node || !node->isHTMLElement() || !node->inDocument() || !node->isContentEditable())
+        return false;
+
+    // In general we want to only draw the UI around object of a certain area, but we still keep the min width/height to
+    // make sure we don't end up with very thin or very short elements getting the UI.
+    const int minimumArea = 2500;
+    const int minimumWidth = 48;
+    const int minimumHeight = 16;
+    const unsigned minimumVisibleBorders = 1;
+
+    RenderObject* renderer = node->renderer();
+    if (!renderer || !renderer->isBox())
+        return false;
+
+    // Disallow the body element since it isn't practical to delete, and the deletion UI would be clipped.
+    if (node->hasTagName(bodyTag))
+        return false;
+
+    // Disallow elements with any overflow clip, since the deletion UI would be clipped as well. <rdar://problem/6840161>
+    if (renderer->hasOverflowClip())
+        return false;
+
+    // Disallow Mail blockquotes since the deletion UI would get in the way of editing for these.
+    if (isMailBlockquote(node))
+        return false;
+
+    RenderBox* box = toRenderBox(renderer);
+    IntRect borderBoundingBox = box->borderBoundingBox();
+    if (borderBoundingBox.width() < minimumWidth || borderBoundingBox.height() < minimumHeight)
+        return false;
+
+    if ((borderBoundingBox.width() * borderBoundingBox.height()) < minimumArea)
+        return false;
+
+    if (renderer->isTable())
+        return true;
+
+    if (node->hasTagName(ulTag) || node->hasTagName(olTag) || node->hasTagName(iframeTag))
+        return true;
+
+    if (renderer->isPositioned())
+        return true;
+
+    if (renderer->isRenderBlock() && !renderer->isTableCell()) {
+        RenderStyle* style = renderer->style();
+        if (!style)
+            return false;
+
+        // Allow blocks that have background images
+        if (style->hasBackgroundImage() && style->backgroundImage()->canRender(1.0f))
+            return true;
+
+        // Allow blocks with a minimum number of non-transparent borders
+        unsigned visibleBorders = style->borderTop().isVisible() + style->borderBottom().isVisible() + style->borderLeft().isVisible() + style->borderRight().isVisible();
+        if (visibleBorders >= minimumVisibleBorders)
+            return true;
+
+        // Allow blocks that have a different background from it's parent
+        ContainerNode* parentNode = node->parentNode();
+        if (!parentNode)
+            return false;
+
+        RenderObject* parentRenderer = parentNode->renderer();
+        if (!parentRenderer)
+            return false;
+
+        RenderStyle* parentStyle = parentRenderer->style();
+        if (!parentStyle)
+            return false;
+
+        if (renderer->hasBackground() && (!parentRenderer->hasBackground() || style->visitedDependentColor(CSSPropertyBackgroundColor) != parentStyle->visitedDependentColor(CSSPropertyBackgroundColor)))
+            return true;
+    }
+
+    return false;
+}
+
+static HTMLElement* enclosingDeletableElement(const VisibleSelection& selection)
+{
+    if (!selection.isContentEditable())
+        return 0;
+
+    RefPtr<Range> range = selection.toNormalizedRange();
+    if (!range)
+        return 0;
+
+    ExceptionCode ec = 0;
+    Node* container = range->commonAncestorContainer(ec);
+    ASSERT(container);
+    ASSERT(ec == 0);
+
+    // The enclosingNodeOfType function only works on nodes that are editable
+    // (which is strange, given its name).
+    if (!container->isContentEditable())
+        return 0;
+
+    Node* element = enclosingNodeOfType(Position(container, 0), &isDeletableElement);
+    if (!element)
+        return 0;
+
+    ASSERT(element->isHTMLElement());
+    return static_cast<HTMLElement*>(element);
+}
+
+void DeleteButtonController::respondToChangedSelection(const VisibleSelection& oldSelection)
+{
+    if (!enabled())
+        return;
+
+    HTMLElement* oldElement = enclosingDeletableElement(oldSelection);
+    HTMLElement* newElement = enclosingDeletableElement(m_frame->selection()->selection());
+    if (oldElement == newElement)
+        return;
+
+    // If the base is inside a deletable element, give the element a delete widget.
+    if (newElement)
+        show(newElement);
+    else
+        hide();
+}
+
+void DeleteButtonController::createDeletionUI()
+{
+    RefPtr<HTMLDivElement> container = HTMLDivElement::create(m_target->document());
+    container->setIdAttribute(containerElementIdentifier);
+
+    CSSMutableStyleDeclaration* style = container->getInlineStyleDecl();
+    style->setProperty(CSSPropertyWebkitUserDrag, CSSValueNone);
+    style->setProperty(CSSPropertyWebkitUserSelect, CSSValueNone);
+    style->setProperty(CSSPropertyWebkitUserModify, CSSValueNone);
+    style->setProperty(CSSPropertyVisibility, CSSValueHidden);
+    style->setProperty(CSSPropertyPosition, CSSValueAbsolute);
+    style->setProperty(CSSPropertyCursor, CSSValueDefault);
+    style->setProperty(CSSPropertyTop, "0");
+    style->setProperty(CSSPropertyRight, "0");
+    style->setProperty(CSSPropertyBottom, "0");
+    style->setProperty(CSSPropertyLeft, "0");
+
+    RefPtr<HTMLDivElement> outline = HTMLDivElement::create(m_target->document());
+    outline->setIdAttribute(outlineElementIdentifier);
+
+    const int borderWidth = 4;
+    const int borderRadius = 6;
+
+    style = outline->getInlineStyleDecl();
+    style->setProperty(CSSPropertyPosition, CSSValueAbsolute);
+    style->setProperty(CSSPropertyZIndex, String::number(-1000000));
+    style->setProperty(CSSPropertyTop, String::number(-borderWidth - m_target->renderBox()->borderTop()) + "px");
+    style->setProperty(CSSPropertyRight, String::number(-borderWidth - m_target->renderBox()->borderRight()) + "px");
+    style->setProperty(CSSPropertyBottom, String::number(-borderWidth - m_target->renderBox()->borderBottom()) + "px");
+    style->setProperty(CSSPropertyLeft, String::number(-borderWidth - m_target->renderBox()->borderLeft()) + "px");
+    style->setProperty(CSSPropertyBorder, String::number(borderWidth) + "px solid rgba(0, 0, 0, 0.6)");
+    style->setProperty(CSSPropertyWebkitBorderRadius, String::number(borderRadius) + "px");
+    style->setProperty(CSSPropertyVisibility, CSSValueVisible);
+
+    ExceptionCode ec = 0;
+    container->appendChild(outline.get(), ec);
+    ASSERT(ec == 0);
+    if (ec)
+        return;
+
+    RefPtr<DeleteButton> button = DeleteButton::create(m_target->document());
+    button->setIdAttribute(buttonElementIdentifier);
+
+    const int buttonWidth = 30;
+    const int buttonHeight = 30;
+    const int buttonBottomShadowOffset = 2;
+
+    style = button->getInlineStyleDecl();
+    style->setProperty(CSSPropertyPosition, CSSValueAbsolute);
+    style->setProperty(CSSPropertyZIndex, String::number(1000000));
+    style->setProperty(CSSPropertyTop, String::number((-buttonHeight / 2) - m_target->renderBox()->borderTop() - (borderWidth / 2) + buttonBottomShadowOffset) + "px");
+    style->setProperty(CSSPropertyLeft, String::number((-buttonWidth / 2) - m_target->renderBox()->borderLeft() - (borderWidth / 2)) + "px");
+    style->setProperty(CSSPropertyWidth, String::number(buttonWidth) + "px");
+    style->setProperty(CSSPropertyHeight, String::number(buttonHeight) + "px");
+    style->setProperty(CSSPropertyVisibility, CSSValueVisible);
+
+    RefPtr<Image> buttonImage = Image::loadPlatformResource("deleteButton");
+    if (buttonImage->isNull())
+        return;
+
+    button->setCachedImage(new CachedImage(buttonImage.get()));
+
+    container->appendChild(button.get(), ec);
+    ASSERT(ec == 0);
+    if (ec)
+        return;
+
+    m_containerElement = container.release();
+    m_outlineElement = outline.release();
+    m_buttonElement = button.release();
+}
+
+void DeleteButtonController::show(HTMLElement* element)
+{
+    hide();
+
+    if (!enabled() || !element || !element->inDocument() || !isDeletableElement(element))
+        return;
+
+    if (!m_frame->editor()->shouldShowDeleteInterface(static_cast<HTMLElement*>(element)))
+        return;
+
+    // we rely on the renderer having current information, so we should update the layout if needed
+    m_frame->document()->updateLayoutIgnorePendingStylesheets();
+
+    m_target = element;
+
+    if (!m_containerElement) {
+        createDeletionUI();
+        if (!m_containerElement) {
+            hide();
+            return;
+        }
+    }
+
+    ExceptionCode ec = 0;
+    m_target->appendChild(m_containerElement.get(), ec);
+    ASSERT(ec == 0);
+    if (ec) {
+        hide();
+        return;
+    }
+
+    if (m_target->renderer()->style()->position() == StaticPosition) {
+        m_target->getInlineStyleDecl()->setProperty(CSSPropertyPosition, CSSValueRelative);
+        m_wasStaticPositioned = true;
+    }
+
+    if (m_target->renderer()->style()->hasAutoZIndex()) {
+        m_target->getInlineStyleDecl()->setProperty(CSSPropertyZIndex, "0");
+        m_wasAutoZIndex = true;
+    }
+}
+
+void DeleteButtonController::hide()
+{
+    m_outlineElement = 0;
+    m_buttonElement = 0;
+
+    ExceptionCode ec = 0;
+    if (m_containerElement && m_containerElement->parentNode())
+        m_containerElement->parentNode()->removeChild(m_containerElement.get(), ec);
+
+    if (m_target) {
+        if (m_wasStaticPositioned)
+            m_target->getInlineStyleDecl()->setProperty(CSSPropertyPosition, CSSValueStatic);
+        if (m_wasAutoZIndex)
+            m_target->getInlineStyleDecl()->setProperty(CSSPropertyZIndex, CSSValueAuto);
+    }
+
+    m_wasStaticPositioned = false;
+    m_wasAutoZIndex = false;
+}
+
+void DeleteButtonController::enable()
+{
+    ASSERT(m_disableStack > 0);
+    if (m_disableStack > 0)
+        m_disableStack--;
+    if (enabled()) {
+        // Determining if the element is deletable currently depends on style
+        // because whether something is editable depends on style, so we need
+        // to recalculate style before calling enclosingDeletableElement.
+        m_frame->document()->updateStyleIfNeeded();
+        show(enclosingDeletableElement(m_frame->selection()->selection()));
+    }
+}
+
+void DeleteButtonController::disable()
+{
+    if (enabled())
+        hide();
+    m_disableStack++;
+}
+
+void DeleteButtonController::deleteTarget()
+{
+    if (!enabled() || !m_target)
+        return;
+
+    RefPtr<Node> element = m_target;
+    hide();
+
+    // Because the deletion UI only appears when the selection is entirely
+    // within the target, we unconditionally update the selection to be
+    // a caret where the target had been.
+    Position pos = positionInParentBeforeNode(element.get());
+    applyCommand(RemoveNodeCommand::create(element.release()));
+    m_frame->selection()->setSelection(VisiblePosition(pos));
+}
+
+} // namespace WebCore