(Spun off from bug 1374697) Some issues: 1. Authors MUST use aria-invalid in conjunction with aria-errormessage, but we're not checking for the presence of a non-false value of aria-invalid. 2. As best as I can tell, there is no spec stating that failed user-agent validation of an input should be treated the same as or mapped to, aria-invalid="true". I've asked about that in https://github.com/w3c/html-aam/issues/47#issuecomment-310221640. Plus Alex indicated in bug 1374697 that the commit history would be more readable if the ATK mapping and sanity checking were two separate bugs.
This is something we should triage and fix but isn't among our most urgent bugs.(Contributions welcome as always!)
Priority: -- → P3
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