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core/html/canvas/MouseEventHitRegion.idl

Index: core/html/canvas/MouseEventHitRegion.idl
diff --git a/core/html/canvas/MouseEventHitRegion.idl b/core/html/canvas/MouseEventHitRegion.idl
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#MouseEvent-partial
+
+[
+    RuntimeEnabled=ExperimentalCanvasFeatures
+] partial interface MouseEvent {
+    readonly attribute DOMString? region;
+};