<window title="Testcase bug 311710 - Evil xul testcase, using display:-moz-grid-group causes crash [@ nsGridRow::IsCollapsed]"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" 
        xmlns:html="http://www.w3.org/1999/xhtml">
<script type="application/x-javascript">
function clickit() {
  var button = document.getElementById('button');
  var evt = document.createEvent("MouseEvents");
  evt.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
  button.dispatchEvent(evt);
}
window.addEventListener('load', clickit, false);
</script>

        <grid>
          <rows>
            <row>
            <separator/> 
            </row>
          </rows>
        </grid>
<button id="button" onclick="document.getElementsByTagName('row')[0].style.display='-moz-grid-group'" label="Mozilla should not crash, when clicking this button"/>
</window>