Cross domain iframe resizing without modifying source web page

I have an iframe resizing problem where I don't have access to or permission to change the source code so I cannot add any code to it.

I've found other solutions, but 开发者_C百科they only deal with when you have control of both sites (own site and source site)

How do I resize an iframe without modifying the source page?

I don't think you'll be able to get around the same-origin policy without modifying the code. Can you provide more information as to what you do have accesss to edit and/or solutions you've tried?