Although these guidelines cover a wide range of issues, they are not
               able to address the needs of people with all types, degrees, and combinations of disability.
               These guidelines also make Web content more usable by older individuals with changing
               abilities due to aging and often improve usability for users in general. WCAG 2.2 is developed through the W3C process in cooperation with individuals and organizations around the world, with a goal of
               providing a shared standard for Web content accessibility that meets the needs of
               individuals, organizations, and governments internationally. WCAG 2.2 builds on WCAG
               2.0 [ WCAG20 ] and WCAG 2.1 [ WCAG21 ], which in turn built on WCAG 1.0 [ WAI-WEBCONTENT ]
               and is designed to apply broadly to different Web technologies now and in the future,
               and to be testable with a combination of automated testing and human evaluation. For
               an introduction to WCAG, see the Web Content Accessibility Guidelines (WCAG) Overview . Significant challenges were encountered in defining additional criteria to address
               cognitive, language, and learning disabilities, including a short timeline for development
               as well as challenges in reaching consensus on testability, implementability, and
               international considerations of proposals.