// 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 Point offsetTo(Element parent)
/// Provides the offset of this element's borderEdge relative to the specified
/// parent.
/// This is the Dart equivalent of jQuery's position method. Unlike jQuery's
/// position, however, parent can be any parent element of this, rather than
/// only this's immediate offsetParent. If the specified element is not an
/// offset parent or transitive offset parent to this element, an ArgumentError
/// is thrown.
/// @description Checks expected offset values
/// @needsreview: ief2.offsetTo(ief1).x causes error
///  "Specified element is not a transitive offset parent of this element"

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

void check(num a, num b, String m) {
  Expect.equals(a, b, m);
}

main() {
  var b = document.body;
  if (b != null) {
    b.setInnerHtml('''<iframe class="ief1"
                   style="position: absolute; left: 10px; top: 10px">
          some text
         </iframe>''', treeSanitizer: new NullTreeSanitizer());
    IFrameElement ief1 = b.getElementsByClassName("ief1")[0] as IFrameElement;

    check(10, ief1.offsetTo(b).x, "id1 relative to body x");
    check(10, ief1.offsetTo(b).y, "id1 relative to body y");
  } else {
    Expect.fail("Body is null");
  }
}