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diff --git a/Source/WebCore/page/IntersectionObserver.idl b/Source/WebCore/page/IntersectionObserver.idl
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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.
+ */
+
+// https://wicg.github.io/IntersectionObserver/
+
+[
+    Conditional=INTERSECTION_OBSERVER,
+    Constructor(IntersectionObserverCallback callback, optional IntersectionObserverInit options),
+    ImplementationLacksVTable,
+    EnabledAtRuntime=IntersectionObserver
+] interface IntersectionObserver {
+    readonly attribute Element? root;
+    readonly attribute DOMString rootMargin;
+    readonly attribute sequence<double> thresholds;
+
+    void observe(Element target);
+    void unobserve(Element target);
+    void disconnect();
+    sequence<IntersectionObserverEntry> takeRecords();
+};
+
+[
+    Conditional=INTERSECTION_OBSERVER,
+    EnabledBySetting=IntersectionObserver
+]
+dictionary IntersectionObserverInit {
+    Element? root = null;
+    DOMString rootMargin = "0px";
+    (double or sequence<double>) threshold = 0.0;
+};