How to apply CSS to iFrame?

<iframe name='iframe1' id="iframe1" src="empty.htm" frameborder="0" border="0" cellspacing="0" style="border-style: none;width: 100%; height: 120px;"></iframe>

<link type="text/css" rel="Stylesheet" href="Style/simple.css" />

var cssLink = document.createElement("link")
cssLink.href = "style.css";
cssLink .rel = "stylesheet";
cssLink .type = "text/css";
frames['frame1'].document.body.appendChild(cssLink);

var frm = frames['frame'].document;
var otherhead = frm.getElementsByTagName("head")[0];
var link = frm.createElement("link");
link.setAttribute("rel", "stylesheet");
link.setAttribute("type", "text/css");
link.setAttribute("href", "style.css");
otherhead.appendChild(link);

var cssLink = document.createElement("link")
    		cssLink.href = "pFstylesEditor.css";
    		cssLink .rel = "stylesheet";
    		cssLink .type = "text/css";

    		//Instead of this
    		//frames['frame1'].document.body.appendChild(cssLink);
//Do this

    		var doc=document.getElementById("edit").contentWindow.document

    		///If you are doing any dynamic writing do that first
    		doc.open;
    		doc.write(myData);
    		doc.close();

    		//Then append child
doc.body.appendChild(cssLink);

var iframe = top.frames[name].document;
var css = '' +
          '<style type="text/css">' +
          'body{margin:0;padding:0;background:transparent}' +
          '</style>';
iframe.open();
iframe.write(css);
iframe.close();

<html>
  <header>
    <script src="/js/jquery.js" type="text/javascript">
  </header>
  <body>
    <div id='include-from-outside'></div>
    <script type='text/javascript'>
      $('#include-from-outside').load('http://example.com/included.html');
    </script>
  </body>
</html>

doc.open();

doc.write('<!DOCTYPE html><html><head><meta charset="utf-8"/><meta http-quiv="Content-Type" content="text/html; charset=utf-8"/><title>Print Frame</title><link rel="stylesheet" type="text/css" href="/css/print.css"/></head><body><table id="' + gridId + 'Printable' + '" class="print" >' + out + '</table></body></html>');

doc.close();