In 2005 these and later versions of user agents
support a text alternative inside the object element when the technology
is not available within the user agent. . (note - I did not verify
these actual version numbers - this is for discussion purposes only!)
In 2005 these versions of assistive technologies are known to support a text alternative inside the object element when the technology is not available in the user agent. Other versions may also provide support but were not specifically tested.
Home Page Reader 3.04
More Information In 2005 alternative text inside the object element is generally available when the program or content specified in the object tag can not be loaded or accessed via the user agent. Note that if the technology is loaded by the user agent but is not accessible to the user agent, the user will NOT by default provide the text alternative. For example, a user using a current version of a screen reader in early 2005 will not hear the alternative text for a Macromedia Flash object if flash is turned on in the user agent but the flash object itself is not accessible.
As noted in my previous post about HTML 5.1  This is NOT a suggested addition to this HTML technique but an exercise to determine how best to provide baseline and support information by attempting it with a few techniques.
Web Accessibility Architect
IBM Emerging Internet Technologies
5 Technology Park Drive
Westford, MA 01886
Voice: 978 399-6101; t/l 333-6101