Get DOM content of cross-domain iframe

have an iframe for a cross-domain site. I want to read the DOM of the iframe, which I believed was possible because using the inspector, I can even modify the DOM of an iframe. Every way I attempt to read it, however, I run into the same origin policy. All I want, is the content loaded in my local DOM, from the iframe. I thought it would be as simple as $([login to view URL]).find('iframe').html(), but that's returning the empty string. I really hope there's a way to do this since the work I've been doing for the last several days has been predicated on this being do-able. Thanks