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diff --git a/dom/webidl/StyleSheet.webidl b/dom/webidl/StyleSheet.webidl
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+++ b/dom/webidl/StyleSheet.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/
+ */
+
+[Exposed=Window]
+interface StyleSheet {
+  [Constant]
+  readonly attribute DOMString type;
+  [Constant, Throws]
+  readonly attribute DOMString? href;
+  // Spec says "Node", but it can go null when the node gets a new
+  // sheet.  That's also why it's not [Constant]
+  [Pure]
+  readonly attribute Node? ownerNode;
+  [Pure]
+  readonly attribute StyleSheet? parentStyleSheet;
+  [Pure]
+  readonly attribute DOMString? title;
+  [Constant, PutForwards=mediaText]
+  readonly attribute MediaList media;
+  [Pure]
+  attribute boolean disabled;
+  // The source map URL for this style sheet.  The source map URL can
+  // be found in one of two ways.
+  //
+  // If a SourceMap or X-SourceMap response header is seen, this is
+  // the value.  If both are seen, SourceMap is preferred.  Because
+  // this relies on the HTTP response, it can change if checked before
+  // the response is available -- which is why it is not [Constant].
+  //
+  // If the style sheet has the special "# sourceMappingURL=" comment,
+  // then this is the URL specified there.
+  //
+  // If the source map URL is not found by either of these methods,
+  // then this is an empty string.
+  [ChromeOnly, Pure]
+  readonly attribute UTF8String sourceMapURL;
+  // The source URL for this style sheet.  If the style sheet has the
+  // special "# sourceURL=" comment, then this is the URL specified
+  // there.  If no such comment is found, then this is the empty
+  // string.
+  [ChromeOnly, Pure]
+  readonly attribute UTF8String sourceURL;
+  [ChromeOnly, Pure]
+  readonly attribute Document? associatedDocument;
+  [ChromeOnly, Pure, BinaryName="isConstructed"]
+  readonly attribute boolean constructed;
+};