--- /dev/null
+/*
+ * Copyright (c) 2000 World Wide Web Consortium,
+ * (Massachusetts Institute of Technology, Institut National de
+ * Recherche en Informatique et en Automatique, Keio University). All
+ * Rights Reserved. This program is distributed under the W3C's Software
+ * Intellectual Property License. This program is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
+ */
+
+package org.w3c.dom.css;
+
+/**
+ * The <code>CSSUnknownRule</code> interface represents an at-rule not
+ * supported by this user agent.
+ * <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113'>Document Object Model (DOM) Level 2 Style Specification</a>.
+ * @since DOM Level 2
+ */
+public interface CSSUnknownRule extends CSSRule {
+}