WCAG

Web Content Accessibility Guidelines (WCAG) is a recommendation published by the Web Accessibility Initiative (WAI) group at the W3C, outlining a set of guidelines for making content accessible primarily for people with disabilities, but also for limited-resource devices and services, such as digital assistants.

WCAG 2 consists of 13 guidelines organized under 4 principles (perceivable, operable, understandable, and robust) and each guideline has testable success criteria.

Priority 1: Web developers must satisfy these requirements, otherwise it will be impossible for one or more groups to access the Web content. Conformance to this level is described as A. Priority 2: Web developers should satisfy these requirements, otherwise some groups will find it difficult to access the Web content. Conformance to this level is described as AA or Double-A. Priority 3: Web developers may satisfy these requirements, in order to make it easier for some groups to access the Web content. Conformance to this level is described as AAA or Triple-A.