third_party/blink/renderer/core/frame/window_post_message_options.idl

 // Copyright 2018 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.

// https://github.com/dtapuska/useractivation

dictionary WindowPostMessageOptions : PostMessageOptions {
    USVString targetOrigin = "/";
};