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diff --git a/Source/WebCore/accessibility/AccessibilitySlider.cpp b/Source/WebCore/accessibility/AccessibilitySlider.cpp
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+++ b/Source/WebCore/accessibility/AccessibilitySlider.cpp
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+/*
+ * Copyright (C) 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "AccessibilitySlider.h"
+
+#include "AXObjectCache.h"
+#include "HTMLInputElement.h"
+#include "HTMLNames.h"
+#include "RenderObject.h"
+#include "RenderSlider.h"
+
+namespace WebCore {
+    
+using namespace HTMLNames;
+
+AccessibilitySlider::AccessibilitySlider(RenderObject* renderer)
+    : AccessibilityRenderObject(renderer)
+{
+}
+
+PassRefPtr<AccessibilitySlider> AccessibilitySlider::create(RenderObject* renderer)
+{
+    return adoptRef(new AccessibilitySlider(renderer));
+}
+
+const AccessibilityObject::AccessibilityChildrenVector& AccessibilitySlider::children()
+{
+    if (!m_haveChildren)
+        addChildren();
+    return m_children;
+}
+
+AccessibilityOrientation AccessibilitySlider::orientation() const
+{
+    // Default to horizontal in the unknown case.
+    if (!m_renderer)
+        return AccessibilityOrientationHorizontal;
+    
+    RenderStyle* style = m_renderer->style();
+    if (!style)
+        return AccessibilityOrientationHorizontal;
+    
+    ControlPart styleAppearance = style->appearance();
+    switch (styleAppearance) {
+    case SliderThumbHorizontalPart:
+    case SliderHorizontalPart:
+    case MediaSliderPart:
+        return AccessibilityOrientationHorizontal;
+    
+    case SliderThumbVerticalPart: 
+    case SliderVerticalPart:
+    case MediaVolumeSliderPart:
+        return AccessibilityOrientationVertical;
+        
+    default:
+        return AccessibilityOrientationHorizontal;
+    }
+}
+    
+void AccessibilitySlider::addChildren()
+{
+    ASSERT(!m_haveChildren); 
+    
+    m_haveChildren = true;
+
+    AccessibilitySliderThumb* thumb = static_cast<AccessibilitySliderThumb*>(m_renderer->document()->axObjectCache()->getOrCreate(SliderThumbRole));
+    thumb->setParentObject(this);
+    m_children.append(thumb);
+}
+
+const AtomicString& AccessibilitySlider::getAttribute(const QualifiedName& attribute) const
+{
+    return element()->getAttribute(attribute);
+}
+    
+AccessibilityObject* AccessibilitySlider::elementAccessibilityHitTest(const IntPoint& point) const
+{
+    if (m_children.size()) {
+        ASSERT(m_children.size() == 1);
+        if (m_children[0]->elementRect().contains(point))
+            return m_children[0].get();
+    }
+    
+    return axObjectCache()->getOrCreate(m_renderer);
+}
+
+bool AccessibilitySlider::accessibilityIsIgnored() const
+{
+    AccessibilityObjectInclusion decision = accessibilityIsIgnoredBase();
+    if (decision == IncludeObject)
+        return false;
+    if (decision == IgnoreObject)
+        return true;
+    
+    return false;
+}
+    
+float AccessibilitySlider::valueForRange() const
+{
+    return element()->value().toFloat();
+}
+
+float AccessibilitySlider::maxValueForRange() const
+{
+    return static_cast<float>(element()->maximum());
+}
+
+float AccessibilitySlider::minValueForRange() const
+{
+    return static_cast<float>(element()->minimum());
+}
+
+void AccessibilitySlider::setValue(const String& value)
+{
+    HTMLInputElement* input = element();
+    
+    if (input->value() == value)
+        return;
+
+    input->setValue(value);
+
+    // Fire change event manually, as RenderSlider::setValueForPosition does.
+    input->dispatchFormControlChangeEvent();
+}
+
+HTMLInputElement* AccessibilitySlider::element() const
+{
+    return static_cast<HTMLInputElement*>(m_renderer->node());
+}
+
+
+AccessibilitySliderThumb::AccessibilitySliderThumb()
+    : m_parentSlider(0)
+{
+}
+
+PassRefPtr<AccessibilitySliderThumb> AccessibilitySliderThumb::create()
+{
+    return adoptRef(new AccessibilitySliderThumb());
+}
+    
+IntRect AccessibilitySliderThumb::elementRect() const
+{
+    if (!m_parentSlider->renderer())
+        return IntRect();
+
+    IntRect intRect = toRenderSlider(m_parentSlider->renderer())->thumbRect();
+    FloatQuad floatQuad = m_parentSlider->renderer()->localToAbsoluteQuad(FloatRect(intRect));
+
+    return floatQuad.enclosingBoundingBox();
+}
+
+IntSize AccessibilitySliderThumb::size() const
+{
+    return elementRect().size();
+}
+
+} // namespace WebCore