You can test specific themes for compliance with these guidelines using a tool such as the WAVE Web Accessibility tool. For sites that require 100% compliance, we recommend testing your theme of choice using the demo page for the theme, for example Twenty Fourteen. We also recommend using Header Text (displaying the Site Title), rather than a Header Image, as some WordPress.com themes will not provide AltText and therefore generate an error in the accessibility tool when a Header Image is set.
The ADA requires that title II entities (State and local governments) and title III entities (businesses and nonprofit organizations that serve the public) communicate effectively with people who have communication disabilities. The goal is to ensure that communication with people with these disabilities is equally effective as communication with people without disabilities.