var body = document.body;
var iframe = document.createElement("iframe");
iframe.id = "one";
body.appendChild(iframe);
var h = document.createElement("h1");
h.innerHTML = "what's the fuck what's the fuckwhat's the fuckwhat's the fuckwhat's the fuckwhat's the fuckwhat's the fuckwhat's  the fuckwhat's 

the fuckwhat's the fuckwhat's the fuckwhat's the fuckwhat's the fuck";

alert("1");
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var fbody1 = iframe.contentWindow.document.body;
fbody1.appendChild(h);