<!DOCTYPE html> <body> <iframe></iframe> <script> var win = window.frames[0]; win.document.open(); win.document.write("<!DOCTYPE html><html><head></head><body></body></html>"); win.document.close(); win.document.body.innerHTML = "<link rel='stylesheet' type='text/css' href='outer-sheet.css' />"; win.document.body.innerHTML += "<p style='padding:2px'>test</p>"; </script> </body>