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Examples of assistive technology companies documenting the features of web technology they support?

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From: Mark Weiler
Date: Jul 15, 2017 12:14PM

The notion of accessibility supported  in WCAG depends on the ability of assistive technologies to use a feature of a web content technology.  (According to the W3C:  "To qualify as an accessibility-supported use of a Web content technology... The way that the Web content technology is used must be supported by users' assistive technology (AT).")
So, if I understand this correctly, using an element of HTML5, for example, to implement a WCAG Success Criteria is valid only if a user's assistive technology can support that particular HTML5 element.
If that's the case, have assisitive technology companies published any documents that list the features of web technologies their ATs can support?