Existence of accessibility standards??????????

[Richard Owlett <rowlett@cloud85.net>]

Do _verifiable_ "accessibility standards" exist?

I wish to ask a publicly funded service some ATYPICAL questions.
When I submit their homepage to https://validator.w3.org/ it reports
   28 errors
   10 warnings

I am *NOT* visually impaired. However I suspect the site would be VERY 
difficult to navigated by visually impaired.

I suspect they will exert effort to answer *MY* questions if I can 
demonstrate I've "done my homework" ;/