diff -r 000000000000 -r 6474c204b198 dom/interfaces/css/nsIDOMCSSRule.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/interfaces/css/nsIDOMCSSRule.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- 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/. */
+
+#include "domstubs.idl"
+
+/**
+ * The nsIDOMCSSRule interface is a datatype for a CSS style rule in
+ * the Document Object Model.
+ *
+ * For more information on this interface please see
+ * http://www.w3.org/TR/DOM-Level-2-Style
+ */
+
+[scriptable, uuid(2938307a-9d70-4b63-8afc-0197e82318ad)]
+interface nsIDOMCSSRule : nsISupports
+{
+  // RuleType
+  const unsigned short      UNKNOWN_RULE                   = 0;
+  const unsigned short      STYLE_RULE                     = 1;
+  const unsigned short      CHARSET_RULE                   = 2;
+  const unsigned short      IMPORT_RULE                    = 3;
+  const unsigned short      MEDIA_RULE                     = 4;
+  const unsigned short      FONT_FACE_RULE                 = 5;
+  const unsigned short      PAGE_RULE                      = 6;
+  const unsigned short      KEYFRAMES_RULE                 = 7;
+  const unsigned short      KEYFRAME_RULE                  = 8;
+  // When layout.css.prefixes.animations is disabled/removed,
+  // we should remove these two MOZ_* constants.
+  const unsigned short      MOZ_KEYFRAMES_RULE             = 7;
+  const unsigned short      MOZ_KEYFRAME_RULE              = 8;
+  const unsigned short      NAMESPACE_RULE                 = 10;
+  const unsigned short      SUPPORTS_RULE                  = 12;
+  const unsigned short      FONT_FEATURE_VALUES_RULE       = 14;
+
+  readonly attribute unsigned short      type;
+           attribute DOMString           cssText;
+                                        // raises(DOMException) on setting
+
+  readonly attribute nsIDOMCSSStyleSheet parentStyleSheet;
+  readonly attribute nsIDOMCSSRule       parentRule;
+};