Level A of WCAG

Level A accessibility requirements establish the essential foundation that prevents complete barriers to access. Without these basic requirements, some users simply cannot use a digital product at all. However, meeting only Level A criteria doesn't create a fully accessible experience — it just prevents total exclusion.

Consider how products convey information through color. A chart using only colors to distinguish data would completely block colorblind users from understanding the information. Level A requires providing alternative ways to convey this information, such as patterns, labels, or icons alongside colors. This is how Level A creates basic usability for all users.