1 files changed, 39 insertions, 0 deletions
diff --git a/dom/webidl/ResizeObserver.webidl b/dom/webidl/ResizeObserver.webidl
new file mode 100644
index 000000000..98700f53c
--- /dev/null
+++ b/dom/webidl/ResizeObserver.webidl
@@ -0,0 +1,39 @@
+/* -*- 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://wicg.github.io/ResizeObserver/
+ */
+
+[Constructor(ResizeObserverCallback callback),
+ Exposed=Window,
+ Pref="layout.css.resizeobserver.enabled"]
+interface ResizeObserver {
+    [Throws]
+    void observe(Element? target);
+    [Throws]
+    void unobserve(Element? target);
+    void disconnect();
+};
+
+callback ResizeObserverCallback = void (sequence<ResizeObserverEntry> entries, ResizeObserver observer);
+
+[Constructor(Element? target),
+ ChromeOnly,
+ Pref="layout.css.resizeobserver.enabled"]
+interface ResizeObserverEntry {
+    readonly attribute Element target;
+    readonly attribute DOMRectReadOnly? contentRect;
+};
+
+[Constructor(Element? target),
+ ChromeOnly,
+ Pref="layout.css.resizeobserver.enabled"]
+interface ResizeObservation {
+    readonly attribute Element target;
+    readonly attribute long broadcastWidth;
+    readonly attribute long broadcastHeight;
+    boolean isActive();
+};