To ensure that people with disabilities can use websites and applications, developers should ensure that their products meet accessibility standards. While a few standards exist, Yale is most concerned with the Web Content Authoring Guidelines 2.0.
Vendors typically disclose their products’ accessibility conformance — and any accessibility issues that may exist — through documents called Voluntary Product Accessibility Template (VPAT). A VPAT is a document, typircally formatted as a grid, that describes detailed accessibility criteria and whether the product complies fully, partially, or not at all with each criterion. Individual criteria on the VPAT can also be marked as not applicable when their criteria do not apply to the product.