Blame layout/base/crashtests/311661-2.xul

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<window xmlns:html="http://www.w3.org/1999/xhtml" class="reftest-wait" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" title="Testcase bug 311661 - Evil xul testcase, using display:table-row causes crash [@ nsTableRowGroupFrame::GetFirstRow]">
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<html:script>
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function doe() {
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document.documentElement.getElementsByTagName('*')[1].style.display='table-row';
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setTimeout(doe2,20);
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}
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function doe2(){
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document.documentElement.getElementsByTagName('*')[1].style.display='';
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setTimeout(doe,20);
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}
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]]></html:script>
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<button id="button" onclick="doe()" label="Mozilla should not crash, when clicking this button"/>
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<html:script>
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function clickbutton()
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{
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  var ev = document.createEvent('MouseEvents');
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  ev.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
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  var button = document.getElementById('button');
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  button.dispatchEvent(ev);
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  setTimeout(function() { document.documentElement.className = "" }, 500);
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}
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window.addEventListener("load", clickbutton, false);
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</html:script>
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</window>