[webkit-dev] How does Safari identify form fields for auto-fill?

[Rick Mann]

It seems to fail on certain forms, including some that I've created.  
(I'm referring to user name & password fields).

How does Safari determine which fields to examine when offering to  
save login information and pre-populate it? I did several searches on  
Google, but mostly turned up articles about insecurities.

TIA,

-- 
Rick