As far as websites go, aren't there already standards for that?
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As for enforcement of adhering to 508 and a11y compliance, US digital projects were guided by executive order M-23-22, "Delivering a Digital-First Public Experience", but from what I can tell that is kind of up in the air at this point... we are following it until someone tells us otherwise, but I don't think it is being enforced anymore with any passion because of the current confusion.