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diff --git a/Source/WebCore/page/IntersectionObserver.h b/Source/WebCore/page/IntersectionObserver.h
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+++ b/Source/WebCore/page/IntersectionObserver.h
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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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
+ */
+
+#pragma once
+
+#if ENABLE(INTERSECTION_OBSERVER)
+
+#include "IntersectionObserverCallback.h"
+#include "IntersectionObserverEntry.h"
+#include <wtf/RefCounted.h>
+#include <wtf/Variant.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class Element;
+
+class IntersectionObserver : public RefCounted<IntersectionObserver> {
+public:
+    struct Init {
+        RefPtr<Element> root;
+        String rootMargin;
+        Variant<double, Vector<double>> threshold;
+    };
+
+    static Ref<IntersectionObserver> create(Ref<IntersectionObserverCallback>&& callback, Init&& init)
+    {
+        return adoptRef(*new IntersectionObserver(WTFMove(callback), WTFMove(init)));
+    }
+    
+    Element* root() const { return m_root.get(); }
+    String rootMargin() const { return m_rootMargin; }
+    const Vector<double>& thresholds() const { return m_thresholds; }
+
+    void observe(Element&);
+    void unobserve(Element&);
+    void disconnect();
+
+    Vector<RefPtr<IntersectionObserverEntry>> takeRecords();
+
+private:
+    IntersectionObserver(Ref<IntersectionObserverCallback>&&, Init&&);
+    
+    RefPtr<Element> m_root;
+    String m_rootMargin;
+    Vector<double> m_thresholds;
+    Ref<IntersectionObserverCallback> m_callback;
+};
+
+
+} // namespace WebCore
+
+#endif // ENABLE(INTERSECTION_OBSERVER)