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diff --git a/dom/webidl/CSS.webidl b/dom/webidl/CSS.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/css3-conditional/
+ * http://dev.w3.org/csswg/cssom/#the-css.escape%28%29-method
+ * https://www.w3.org/TR/css-highlight-api-1/#registration
+ *
+ * Copyright © 2012 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=Window]
+namespace CSS {
+  boolean supports(UTF8String property, UTF8String value);
+  boolean supports(UTF8String conditionText);
+};
+
+// http://dev.w3.org/csswg/cssom/#the-css.escape%28%29-method
+partial namespace CSS {
+  DOMString escape(DOMString ident);
+};
+
+// https://www.w3.org/TR/css-highlight-api-1/#registration
+partial namespace CSS {
+  [Pref="dom.customHighlightAPI.enabled", GetterThrows]
+  readonly attribute HighlightRegistry highlights;
+};