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diff --git a/components/script_bindings/webidls/CSS.webidl b/components/script_bindings/webidls/CSS.webidl
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+++ b/components/script_bindings/webidls/CSS.webidl
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+/* 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 https://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * http://dev.w3.org/csswg/cssom/#the-css-interface
+ */
+
+[Abstract, Exposed=Window]
+interface CSS {
+  [Throws]
+  static DOMString escape(DOMString ident);
+};
+
+// https://drafts.csswg.org/css-conditional-3/#the-css-interface
+partial interface CSS {
+  static boolean supports(DOMString property, DOMString value);
+  static boolean supports(DOMString conditionText);
+};
+
+// https://drafts.css-houdini.org/css-paint-api-1/#paint-worklet
+partial interface CSS {
+    [SameObject, Pref="dom_worklet_enabled"] static readonly attribute Worklet paintWorklet;
+};