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diff --git a/dom/webidl/CSSStyleDeclaration.webidl b/dom/webidl/CSSStyleDeclaration.webidl
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+++ b/dom/webidl/CSSStyleDeclaration.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
+ * http://dev.w3.org/csswg/cssom/
+ */
+
+ // Because of getComputedStyle, many CSSStyleDeclaration objects can be
+ // short-living.
+[ProbablyShortLivingWrapper,
+ Exposed=Window]
+interface CSSStyleDeclaration {
+  [CEReactions, SetterNeedsSubjectPrincipal=NonSystem, SetterThrows]
+  attribute UTF8String cssText;
+
+  readonly attribute unsigned long length;
+  getter UTF8String item(unsigned long index);
+
+  [Throws, ChromeOnly]
+  sequence<UTF8String> getCSSImageURLs(UTF8String property);
+
+  [Throws]
+  UTF8String getPropertyValue(UTF8String property);
+  UTF8String getPropertyPriority(UTF8String property);
+  [CEReactions, NeedsSubjectPrincipal=NonSystem, Throws]
+  undefined setProperty(UTF8String property, [LegacyNullToEmptyString] UTF8String value, optional [LegacyNullToEmptyString] UTF8String priority = "");
+  [CEReactions, Throws]
+  UTF8String removeProperty(UTF8String property);
+
+  readonly attribute CSSRule? parentRule;
+};