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diff --git a/Source/WebCore/html/HTMLSlotElement.cpp b/Source/WebCore/html/HTMLSlotElement.cpp
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+++ b/Source/WebCore/html/HTMLSlotElement.cpp
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+/*
+ * Copyright (C) 2015 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 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 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 "HTMLSlotElement.h"
+
+#include "Event.h"
+#include "EventNames.h"
+#include "HTMLNames.h"
+#include "MutationObserver.h"
+#include "ShadowRoot.h"
+#include "Text.h"
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+Ref<HTMLSlotElement> HTMLSlotElement::create(const QualifiedName& tagName, Document& document)
+{
+    return adoptRef(*new HTMLSlotElement(tagName, document));
+}
+
+HTMLSlotElement::HTMLSlotElement(const QualifiedName& tagName, Document& document)
+    : HTMLElement(tagName, document)
+{
+    ASSERT(hasTagName(slotTag));
+}
+
+HTMLSlotElement::InsertionNotificationRequest HTMLSlotElement::insertedInto(ContainerNode& insertionPoint)
+{
+    auto insertionResult = HTMLElement::insertedInto(insertionPoint);
+    ASSERT_UNUSED(insertionResult, insertionResult == InsertionDone);
+
+    // This function could be called when this element's shadow root's host or its ancestor is inserted.
+    // This element is new to the shadow tree (and its tree scope) only if the parent into which this element
+    // or its ancestor is inserted belongs to the same tree scope as this element's.
+    if (insertionPoint.isInShadowTree() && isInShadowTree() && &insertionPoint.treeScope() == &treeScope()) {
+        if (auto shadowRoot = containingShadowRoot())
+            shadowRoot->addSlotElementByName(attributeWithoutSynchronization(nameAttr), *this);
+    }
+
+    return InsertionDone;
+}
+
+void HTMLSlotElement::removedFrom(ContainerNode& insertionPoint)
+{
+    // ContainerNode::removeBetween always sets the removed child's tree scope to Document's but InShadowRoot flag is unset in Node::removedFrom.
+    // So if InShadowRoot flag is set but this element's tree scope is Document's, this element has just been removed from a shadow root.
+    if (insertionPoint.isInShadowTree() && isInShadowTree() && &treeScope() == &document()) {
+        auto* oldShadowRoot = insertionPoint.containingShadowRoot();
+        ASSERT(oldShadowRoot);
+        oldShadowRoot->removeSlotElementByName(attributeWithoutSynchronization(nameAttr), *this);
+    }
+
+    HTMLElement::removedFrom(insertionPoint);
+}
+
+void HTMLSlotElement::attributeChanged(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& newValue, AttributeModificationReason reason)
+{
+    HTMLElement::attributeChanged(name, oldValue, newValue, reason);
+
+    if (isInShadowTree() && name == nameAttr) {
+        if (auto* shadowRoot = containingShadowRoot()) {
+            shadowRoot->removeSlotElementByName(oldValue, *this);
+            shadowRoot->addSlotElementByName(newValue, *this);
+        }
+    }
+}
+
+const Vector<Node*>* HTMLSlotElement::assignedNodes() const
+{
+    auto* shadowRoot = containingShadowRoot();
+    if (!shadowRoot)
+        return nullptr;
+
+    return shadowRoot->assignedNodesForSlot(*this);
+}
+
+static void flattenAssignedNodes(Vector<Node*>& nodes, const HTMLSlotElement& slot)
+{
+    auto* assignedNodes = slot.assignedNodes();
+    if (!assignedNodes) {
+        for (Node* child = slot.firstChild(); child; child = child->nextSibling()) {
+            if (is<HTMLSlotElement>(*child))
+                flattenAssignedNodes(nodes, downcast<HTMLSlotElement>(*child));
+            else if (is<Text>(*child) || is<Element>(*child))
+                nodes.append(child);
+        }
+        return;
+    }
+    for (Node* node : *assignedNodes) {
+        if (is<HTMLSlotElement>(*node))
+            flattenAssignedNodes(nodes, downcast<HTMLSlotElement>(*node));
+        else
+            nodes.append(node);
+    }
+}
+
+Vector<Node*> HTMLSlotElement::assignedNodes(const AssignedNodesOptions& options) const
+{
+    if (options.flatten) {
+        Vector<Node*> nodes;
+        flattenAssignedNodes(nodes, *this);
+        return nodes;
+    }
+    auto* assignedNodes = this->assignedNodes();
+    if (!assignedNodes)
+        return { };
+    return *assignedNodes;
+}
+
+void HTMLSlotElement::enqueueSlotChangeEvent()
+{
+    // https://dom.spec.whatwg.org/#signal-a-slot-change
+    if (m_inSignalSlotList)
+        return;
+    m_inSignalSlotList = true;
+    MutationObserver::enqueueSlotChangeEvent(*this);
+}
+
+void HTMLSlotElement::dispatchSlotChangeEvent()
+{
+    m_inSignalSlotList = false;
+
+    bool bubbles = true;
+    bool cancelable = false;
+    Ref<Event> event = Event::create(eventNames().slotchangeEvent, bubbles, cancelable);
+    event->setTarget(this);
+    dispatchEvent(event);
+}
+
+}
+