LibTest/html/Element/previousNode_A01_t01.dart

// 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.

/// @assertion final Node previousNode
/// The previous sibling node.
/// @description Checks expected attribute values.

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

main() {
  var x = new Element.html('<span></span>');
  Expect.isNull(x.previousNode);

  x = new Element.html(
      '<div><span id="span1"></span>text node<span id="span2"></span></div>');
  var y = x.querySelector('#span2');

  var n1 = y?.previousNode; // text node should not be skipped
  Expect.equals('text node', n1?.text);

  var n2 = n1?.previousNode as Element?; // span1
  Expect.equals('span1', n2?.id);

  var n3 = n2?.previousNode;
  Expect.isNull(n3);
}