<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var root = document.documentElement;
while(root.firstChild) { root.removeChild(root.firstChild); }
var body = document.createElementNS("http://www.w3.org/1999/xhtml", "body");
body.setAttributeNS(null, "contenteditable", "true");
var img = document.createElementNS("http://www.w3.org/1999/xhtml", "img");
body.appendChild(img);
root.appendChild(body);
document.removeChild(root);
document.appendChild(root);
document.execCommand("insertText", false, "5");
document.execCommand("selectAll", false, null);
document.execCommand("insertParagraph", false, null);
document.execCommand("increasefontsize", false, null);
}
</script>
</head>
<body onload="boom();"></body>
</html>