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diff --git a/Source/WebCore/accessibility/AccessibilityLabel.cpp b/Source/WebCore/accessibility/AccessibilityLabel.cpp
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+++ b/Source/WebCore/accessibility/AccessibilityLabel.cpp
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+/*
+ * Copyright (C) 2016 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 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 "AccessibilityLabel.h"
+
+#include "AXObjectCache.h"
+#include "HTMLNames.h"
+
+namespace WebCore {
+    
+using namespace HTMLNames;
+
+AccessibilityLabel::AccessibilityLabel(RenderObject* renderer)
+    : AccessibilityRenderObject(renderer)
+{
+}
+
+AccessibilityLabel::~AccessibilityLabel()
+{
+}
+
+Ref<AccessibilityLabel> AccessibilityLabel::create(RenderObject* renderer)
+{
+    return adoptRef(*new AccessibilityLabel(renderer));
+}
+
+bool AccessibilityLabel::computeAccessibilityIsIgnored() const
+{
+    return accessibilityIsIgnoredByDefault();
+}
+
+String AccessibilityLabel::stringValue() const
+{
+    if (containsOnlyStaticText())
+        return textUnderElement();
+    return AccessibilityNodeObject::stringValue();
+}
+
+static bool childrenContainOnlyStaticText(const AccessibilityObject::AccessibilityChildrenVector& children)
+{
+    if (!children.size())
+        return false;
+    for (const auto& child : children) {
+        if (child->roleValue() == StaticTextRole)
+            continue;
+        if (child->roleValue() == GroupRole) {
+            if (!childrenContainOnlyStaticText(child->children()))
+                return false;
+        } else
+            return false;
+    }
+    return true;
+}
+
+bool AccessibilityLabel::containsOnlyStaticText() const
+{
+    if (m_containsOnlyStaticTextDirty)
+        return childrenContainOnlyStaticText(m_children);
+    return m_containsOnlyStaticText;
+}
+
+void AccessibilityLabel::updateChildrenIfNecessary()
+{
+    AccessibilityRenderObject::updateChildrenIfNecessary();
+    if (m_containsOnlyStaticTextDirty)
+        m_containsOnlyStaticText = childrenContainOnlyStaticText(m_children);
+    m_containsOnlyStaticTextDirty = false;
+}
+
+void AccessibilityLabel::clearChildren()
+{
+    AccessibilityRenderObject::clearChildren();
+    m_containsOnlyStaticText = false;
+    m_containsOnlyStaticTextDirty = false;
+}
+
+void AccessibilityLabel::insertChild(AccessibilityObject* object, unsigned index)
+{
+    AccessibilityRenderObject::insertChild(object, index);
+    m_containsOnlyStaticTextDirty = true;
+}
+
+} // namespace WebCore