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Test Info:

<!DOCTYPE html>
<html class="test-wait">
<head>
<script>
function init1()
{
targetIframe = document.createElementNS('http://www.w3.org/1999/xhtml', 'iframe');
targetIframe.srcdoc = "<html></html>";
targetIframe.setAttribute("style", "width: 300px; height: 200px; border: 1px dotted green;");
targetIframe.addEventListener("load", init2);
document.body.appendChild(targetIframe);
}
function init2()
{
targetWindow = targetIframe.contentWindow;
targetDocument = targetWindow.document;
var div = document.getElementById("div");
textNode = div.firstChild;
targetDocument.body.appendChild(targetDocument.adoptNode(div, true));
targetDocument.designMode = 'on';
setTimeout(init3, 0);
}
function init3()
{
var rng = targetDocument.createRange();
rng.setStart(textNode, 1);
rng.setEnd(textNode, 1);
targetWindow.getSelection().addRange(rng);
try {
targetDocument.execCommand("inserthtml", false, "<p>");
} catch(e) {}
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="init1();">
<div id="div"> </div>
<script>
</script>
</body>
</html>