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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
document.execCommand("inserthtml", false, "ABC ");
document.execCommand("delete", false, null);
document.execCommand("inserthtml", false, "<style>");
}
</script>
</head>
<body onload="setTimeout(boom, 0);" contenteditable="true"></body>
</html>