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diff --git a/components/script/dom/webidls/IntersectionObserverEntry.webidl b/components/script/dom/webidls/IntersectionObserverEntry.webidl
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+++ b/components/script/dom/webidls/IntersectionObserverEntry.webidl
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+/* 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 https://mozilla.org/MPL/2.0/. */
+
+// https://w3c.github.io/IntersectionObserver/#intersection-observer-entry
+
+[Pref="dom.intersection_observer.enabled", Exposed=(Window)]
+interface IntersectionObserverEntry {
+  constructor(IntersectionObserverEntryInit intersectionObserverEntryInit);
+  readonly attribute DOMHighResTimeStamp time;
+  readonly attribute DOMRectReadOnly? rootBounds;
+  readonly attribute DOMRectReadOnly boundingClientRect;
+  readonly attribute DOMRectReadOnly intersectionRect;
+  readonly attribute boolean isIntersecting;
+  readonly attribute boolean isVisible;
+  readonly attribute double intersectionRatio;
+  readonly attribute Element target;
+};
+
+dictionary IntersectionObserverEntryInit {
+  required DOMHighResTimeStamp time;
+  required DOMRectInit rootBounds;
+  required DOMRectInit boundingClientRect;
+  required DOMRectInit intersectionRect;
+  required boolean isIntersecting;
+  required boolean isVisible;
+  required double intersectionRatio;
+  required Element target;
+};