1 files changed, 18 insertions, 0 deletions
diff --git a/dom/webidl/ContentVisibilityAutoStateChangeEvent.webidl b/dom/webidl/ContentVisibilityAutoStateChangeEvent.webidl
new file mode 100644
index 0000000000..91b7ca2e14
--- /dev/null
+++ b/dom/webidl/ContentVisibilityAutoStateChangeEvent.webidl
@@ -0,0 +1,18 @@
+/* -*- 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/css-contain-2/#content-visibility-auto-state-changed
+ */
+
+[Exposed=Window, Pref="layout.css.content-visibility.enabled"]
+interface ContentVisibilityAutoStateChangeEvent : Event {
+  constructor(DOMString type,
+              optional ContentVisibilityAutoStateChangeEventInit eventInitDict = {});
+  readonly attribute boolean skipped;
+};
+
+dictionary ContentVisibilityAutoStateChangeEventInit : EventInit {
+  boolean skipped = false;
+};