LibTest/html/IFrameElement/remove_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 void remove()
/// Removes this node from the DOM
/// @description Checks expected dom after removal

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

main() {
  IFrameElement x =
      new Element.html('<iframe>Content</iframe>') as IFrameElement;

  var y = x.firstChild;
  y?.remove();
  Expect.isNull(x.firstChild, 'removal of the only child');

  //-------
  x = new Element.html('<iframe>Content</iframe>') as IFrameElement;
  x.insertBefore(new DivElement(), x.firstChild);
  var div = x.firstChild;
  div?.remove();
  Expect.isTrue(x.firstChild is Text, 'removal of one of children');

  //-------
  x = new Element.html('<iframe>Content</iframe>') as IFrameElement;
  x.insertBefore(
      new Element.html('<iframe><div><h1></h1></div><pre></pre></iframe>'),
      x.firstChild);
  div = x.firstChild;

  div?.remove();
  Expect.isTrue(x.firstChild is Text, 'removal of subtree');
}