<script src='../../resources/js-test.js'></script>
<body>
<b><p>
<iframe></iframe>
<script>document.body.offsetTop; /* force iframe to attach synchronously */</script>
<!--
Force reparenting by closing <b> first. This makes the following tree:
+b
+p
 +b
  +iframe
  +script
-->
</b></p>
<script>
debug('PASS if test does not crash in DEBUG builds.');
</script>