How to enable iOS 5 Safari Reader on my website?

Question

How does the Reader function of Mobile Safari in iOS 5 work? How do I enable it on my site. How do I tell it what content on my page is an article to trigger this function?<

Answer 1

HTML5 article tag doesn't trigger it on my tests. It also doesn't seem to work on offline content (i.e. pages saved on your local machine).

What does seem to trigger it is a div block with a lot of p's with a lot of text.