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Test Info:

<head>
<script>
<![CDATA[
function init()
{
var targetWindow = window.frames[0];
var targetDocument = targetWindow.document;
targetDocument.body.appendChild(document.getElementById('rootish'));
targetDocument.designMode = 'on';
var r = targetDocument.createRange();
r.setStart(targetDocument.getElementById("start"), 0);
r.setEnd (targetDocument.getElementById("end"), 0);
targetWindow.getSelection().addRange(r);
targetDocument.execCommand('bold', false, null);
}
]]>
</script>
</head>
<body onload="setTimeout(init, 200);">
<iframe src="data:text/html," style="width: 95%; height: 500px;"></iframe>
<div id="rootish">
<div id="start"></div>
<hbox/>
<vbox id="end">
<hbox/>
</vbox>
</hbox>
</div>
</body>
</html>