Described here.
Current results (where the last column signifies full conformance):
Test | HTML | Text | XHTML | * | |||||
Aggregator | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | * |
Abdera | |||||||||
atom-tools | |||||||||
Bloglines | |||||||||
FeedDemon 2.0 | |||||||||
FeedTools 0.2.23 | |||||||||
Firefox 1.5 | x | x | x | x | x | x | |||
Firefox 2a3 | |||||||||
Google Reader | |||||||||
Google Home (ig) | x | x | x | x | x | x | |||
Gregarius | x | x | x | x | x | x | |||
Internet Explorer 7 Beta2 | |||||||||
JetBrains Omea | x | x | x | x | x | x | |||
JournURL | |||||||||
Liferea | |||||||||
LiveJournal | x | x | x | x | x | x | |||
My Yahoo! | x | x | x | x | x | x | x | ||
NetNewsWire 2.1b28 | x | x | x | ||||||
NewsFire | x | x | x | x | x | x | |||
Netvibes | x | x | x | x | x | x | |||
Newsgator Online | x | x | x | x | x | x | |||
Newzcrawler 1.8RC3 | x | x | x | ||||||
Opera | |||||||||
RSS Bandit v1.3.0.42 | |||||||||
RSS Owl 1.2 | x | x | x | x | x | x | |||
Safari 2.02 | |||||||||
Sage | x | x | x | x | x | x | x | x | x |
Sharpreader | |||||||||
Shrook | |||||||||
SimplePie 1.0.1 | |||||||||
Snarfer | |||||||||
Thunderbird (cvs) | |||||||||
Universal Feed Parser | |||||||||
Vienna2 |