title: iframe span page width
body: <p>I would like my <code>iframe</code> to span the width of the page, and go down to the bottom of the page. In <a href="http://www.w3schools.com/tags/tag_iframe.asp" rel="nofollow">this w3 page</a> I see the width and height options, but they must be specified in pixels. How can I set it to span the way I would like?</p>