From a BISG Announcement:
To help content creators and executives make decisions in the rapidly evolving world of digital publishing — with its myriad devices and reading systems — BISG, through its Content Structure Committee has developed the EPUB 3.0 Support Grid. Recognizing the constantly shifting nature of digital publishing, the Content Structure Committee plans to continuously update the Grid.
The Grid is designed to be a handy reference to what enhancements and features of the recently released EPUB 3.0 are usable on which device, app, and reading system. The Grid was created and filled in by industry experts representing leading publishers, service providers, and technology vendors.
Companies Participating in the Development of the Grid Include:
Adobe, Apex Covantage, BookNet Canada, Bowker, Copyright Clearance Center, Google, Hachette Book Group, HarperCollins, Ingram/VitalSource, International Digital Publishing Forum (IDPF), John Wiley & Sons, MBS Direct, Newgen, Penguin Group US, Safari Books Online, Simon & Schuster, Sourcebooks, Taylor & Francis, and Zondervan.
BISG welcomes feedback at: firstname.lastname@example.org.