From W3C Wiki
The use cases documented here are not the core, basic use cases for Intents. They are simply the ones that came up during the DAP brainstorming session on Intents and that we would like to make sure are possible (or, sometimes, know if they are possible).
Possibly something like BrowserID. Do OAuth/OpenID in an intent.
What are the use cases for background disposition
Intent talking to a native application
Sharing an Intent "Session" Among Devices
IT Restriction Use Cases
Writing a Mail Client
How will Web Intents work with proxy browsing?
(Not sure what that means)
Relationship between Services & Searching for an Intent
E.g. edit -> share