This is for when the page containing the iframe is on a different domain.
For example, when loading this page in an iframe ( http://bleacherreport.com/articles/1707335-5-green-bay-packer-players-who-will-surprise-in-training-camp ), the slideshow buttons will no longer work and comments will not show because the JS won't load. I've seen sites like StumbleUpon get around issues like this. How can this be achieved?