<!doctype html>
<title>window.length</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
var iframe;
var subframe;
var other_window;
test(function() {assert_equals(window.length, 0)}, "No child browsing contexts");
test(function() {
  iframe = document.createElement("iframe");
  assert_equals(window.length, 0)
}, "iframe not inserted into the document");

test(function() {
  document.body.appendChild(iframe);
  assert_equals(window.length, 1)
}, "One iframe inserted into the document");

test(function() {
  subframe = document.createElement("iframe");
  iframe.contentDocument.body.appendChild(subframe);
  assert_equals(window.length, 1);
}, "Child browsing context has a child browsing context");

test(function() {
  try {
    assert_equals(iframe.contentWindow.length, 1);
  } finally {
    subframe.parentNode.removeChild(subframe);
  }
}, "window.length in child frame");

test(function() {
  iframe.parentNode.removeChild(iframe);
  other_window = window.open();
  assert_equals(window.length, 0);
  assert_equals(other_window.length, 0);
}, "Opened window")

test(function() {
  other_window.document.body.appendChild(iframe);
  try {
    assert_equals(other_window.length, 1);
  } finally {
    other_window.close();
  }
}, "Iframe in opened window")

</script>