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Test Info:

<!DOCTYPE HTML>
<html class="reftest-wait">
<body onload="setTimeout(doTest,0);">
<iframe id="edit" style="display:none;" src=""></iframe>
<script>
var x=document.getElementById('edit');
function doTest(){
x.style.display='block';
x.contentDocument.body.innerHTML="This is a test";
x.contentDocument.designMode='on';
x.contentDocument.execCommand("selectAll", false, "");
x.contentDocument.execCommand("bold", false, "");
x.contentDocument.execCommand("justifyCenter", false, "");
x.contentWindow.getSelection().removeAllRanges();
document.documentElement.className = "";
}
</script>
</body>
</html>