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diff --git a/dom/webidl/CSSRule.webidl b/dom/webidl/CSSRule.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://drafts.csswg.org/cssom/#the-cssrule-interface
+ * https://drafts.csswg.org/css-animations/#interface-cssrule
+ * https://drafts.csswg.org/css-counter-styles-3/#extentions-to-cssrule-interface
+ * https://drafts.csswg.org/css-conditional-3/#extentions-to-cssrule-interface
+ * https://drafts.csswg.org/css-fonts-3/#om-fontfeaturevalues
+ */
+
+// https://drafts.csswg.org/cssom/#the-cssrule-interface
+[Exposed=Window]
+interface CSSRule {
+
+  const unsigned short STYLE_RULE = 1;
+  const unsigned short CHARSET_RULE = 2; // historical
+  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;
+  // FIXME: We don't support MARGIN_RULE yet.
+  // XXXbz Should we expose the constant anyway?
+  // const unsigned short MARGIN_RULE = 9;
+  const unsigned short NAMESPACE_RULE = 10;
+  [BinaryName="typeForBindings"] readonly attribute unsigned short type;
+  attribute UTF8String cssText;
+  readonly attribute CSSRule? parentRule;
+  readonly attribute CSSStyleSheet? parentStyleSheet;
+};
+
+// https://drafts.csswg.org/css-animations/#interface-cssrule
+partial interface CSSRule {
+    const unsigned short KEYFRAMES_RULE = 7;
+    const unsigned short KEYFRAME_RULE = 8;
+};
+
+// https://drafts.csswg.org/css-counter-styles-3/#extentions-to-cssrule-interface
+partial interface CSSRule {
+    const unsigned short COUNTER_STYLE_RULE = 11;
+};
+
+// https://drafts.csswg.org/css-conditional-3/#extentions-to-cssrule-interface
+partial interface CSSRule {
+    const unsigned short SUPPORTS_RULE = 12;
+};
+
+// Non-standard extension for @-moz-document rules.
+partial interface CSSRule {
+    [ChromeOnly]
+    const unsigned short DOCUMENT_RULE = 13;
+};
+
+// https://drafts.csswg.org/css-fonts-3/#om-fontfeaturevalues
+partial interface CSSRule {
+  const unsigned short FONT_FEATURE_VALUES_RULE = 14;
+};