1 files changed, 14 insertions, 0 deletions
diff --git a/dom/webidl/CSSScopeRule.webidl b/dom/webidl/CSSScopeRule.webidl
new file mode 100644
index 0000000000..009209beaf
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+++ b/dom/webidl/CSSScopeRule.webidl
@@ -0,0 +1,14 @@
+/* -*- 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/css-cascade-6/#the-cssscoperule-interface
+ */
+
+[Exposed=Window, Pref="layout.css.at-scope.enabled"]
+interface CSSScopeRule : CSSGroupingRule {
+  readonly attribute UTF8String? start;
+  readonly attribute UTF8String? end;
+};