An iframe with a left and right margin of 50 pixels:

Edit code and click me	Your Result (Some examples do not work in Google Chrome):
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </head> <body> <iframe src="http://xhtml.co.il/tryit/html/en/demo_iframe.htm" marginwidth="50px"> <p>Your browser does not support iframes.</p> </iframe> </body> </html>
Edit the code above and click to see the result	www.xhtml.co.il - Try it yourself