// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// @dart = 2.9

/// @assertion final Document ownerDocument
/// The document this node belongs to.
/// MDN:  If this property is used on a node that is itself a document, the result is null.
/// Returns null if this node does not belong to any document.
/// @description Checks that document does not belong to any document.

import "dart:html";
import "../../../Utils/expect.dart";

main() {
  Expect.isNull(document.ownerDocument);
}