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diff --git a/dom/webidl/IntersectionObserver.webidl b/dom/webidl/IntersectionObserver.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/IntersectionObserver/
+ */
+
+[ProbablyShortLivingWrapper, Exposed=Window]
+interface IntersectionObserverEntry {
+  [Constant]
+  readonly attribute DOMHighResTimeStamp time;
+  [Constant]
+  readonly attribute DOMRectReadOnly? rootBounds;
+  [Constant]
+  readonly attribute DOMRectReadOnly boundingClientRect;
+  [Constant]
+  readonly attribute DOMRectReadOnly intersectionRect;
+  [Constant]
+  readonly attribute boolean isIntersecting;
+  [Constant]
+  readonly attribute double intersectionRatio;
+  [Constant]
+  readonly attribute Element target;
+};
+
+[Exposed=Window]
+interface IntersectionObserver {
+  [Throws]
+  constructor(IntersectionCallback intersectionCallback,
+              optional IntersectionObserverInit options = {});
+
+  [Constant]
+  readonly attribute Node? root;
+  [Constant]
+  readonly attribute UTF8String rootMargin;
+  [Constant,Cached]
+  readonly attribute sequence<double> thresholds;
+  undefined observe(Element target);
+  undefined unobserve(Element target);
+  undefined disconnect();
+  sequence<IntersectionObserverEntry> takeRecords();
+};
+
+callback IntersectionCallback =
+  undefined (sequence<IntersectionObserverEntry> entries, IntersectionObserver observer);
+
+dictionary IntersectionObserverEntryInit {
+  required DOMHighResTimeStamp time;
+  required DOMRectInit rootBounds;
+  required DOMRectInit boundingClientRect;
+  required DOMRectInit intersectionRect;
+  required Element target;
+};
+
+dictionary IntersectionObserverInit {
+  (Element or Document)? root = null;
+  UTF8String rootMargin = "0px";
+  (double or sequence<double>) threshold = 0;
+};