Someone has already asked, [How does the DiggBar work?](https://stackoverflow.com/questions/736730/how-does-the-diggbar-work) in a previous question.

While someone provided a decent answer it didn't address one thing: 

> 
> How does Digg dynamically resize their
>  iframe's height, based on the content
>  of a site across a different domain?
> 
> 
> 

There are plenty of questions and answers here on SO for dynamically adjusting an iframes height based off content (using javascript) **as long as the framed url is on your own domain.** However, Digg seems to have solved this problem with websites of any domain.

Do any SO web programmers have any idea how they accomplished that?

Note: The iframe is NOT simply set to 100% height. The iframe tag simply does not work like that. Google "100% height iframe" and you'll see what I mean.