Dynamically Load External Webpage

Dynamically Load External Webpage

I see this site and many others answering similar questions, but often in
ways I fail to understand or just do not make sense. And often in
contradictory ways (maybe the spec keeps changing?). And I see posts about
how to set up cross domain JavaScript communication, but I do not need to
communicate with this external content (and I am still not sure if you
must have access to the code-base of both child and parent or not, for
these hacks to work).
I need to show another person's webpage, on another domain, in a box on my
page. SO basically this is like clicking a link, but instead of specifying
that the browser should open this in a new tab or a new window, I want the
browser to open it in a in-line frame type deal on the current page. So
even I know enough about security to know that there are no
security/communications issues with this feature.
But assuming that the browser developers have removed this completely
reasonable feature, how do I go about doing this? I have heard talk about
some Json data type thing being allowed, but still have not figured out
exactly what that means. Can I contact any random external page and get
some json summery of the page, or how does this work? (I saw an example
with Wikipedia, but I was not sure exactly what was being returned, and if
any random URL would work just as well).
I can use PHP for this, but that is just stupid. I would basically just be
setting up a proxy to access content I am randomly banned from because of
the programming language I am trying to access it from.