<title>Testcase, bug 143862</title>
<style type="text/css">
html { overflow: hidden; }
</style>
<script>
dump("143862-1-inner.html: A\n");
window.addEventListener("DOMContentLoaded", o);
function o()
{
  dump("143862-1-inner.html: B\n");
  document.open();
  dump("143862-1-inner.html: C\n");
  parent.document.documentElement.removeAttribute("class");
  dump("143862-1-inner.html: D\n");
  document.close();
}
</script>