Initial steps for CSSOM API

components/script/dom/webidls/StyleSheet.webidl

@@ -0,0 +1,17 @@
+/* -*- 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/. */
+
+// https://drafts.csswg.org/cssom/#the-stylesheet-interface
+interface StyleSheet {
+  readonly attribute DOMString type_;
+  readonly attribute DOMString? href;
+
+  // readonly attribute (Element or ProcessingInstruction)? ownerNode;
+  // readonly attribute StyleSheet? parentStyleSheet;
+  readonly attribute DOMString? title;
+
+  // [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+  // attribute boolean disabled;
+};