WCAG 2.2 vs 2.1 vs 2.0: What Changed and What Matters

WCAG has evolved significantly since version 2.0 was published in 2008. Each version builds on the previous one, adding new success criteria to address emerging web technologies and user needs.

WCAG 2.0 (2008) established the foundational framework with 61 success criteria across four principles. It addressed core accessibility concerns like text alternatives, keyboard access, and color contrast. This version is referenced in Section 508 requirements.

WCAG 2.1 (2018) added 17 new success criteria, primarily addressing mobile accessibility, low vision users, and cognitive disabilities. Key additions include Orientation (1.3.4), Reflow (1.4.10) for responsive design, Text Spacing (1.4.12), and Motion Actuation (2.5.4).

WCAG 2.2 (2023) added 9 new success criteria focusing on cognitive accessibility and mobile usability. Notable additions include Focus Not Obscured (2.4.11), Dragging Movements (2.5.7), Target Size Minimum (2.5.8), and Accessible Authentication (3.3.8). These criteria reflect the reality of modern web applications and the needs of users with cognitive disabilities.

For businesses, the practical impact is significant. WCAG 2.2 Level AA is the forward-looking standard. While courts currently reference 2.1 AA, building to 2.2 AA future-proofs your investment and provides better accessibility for all users.