Web Content Accessibility Guidelines - The Global Standard for Digital Accessibility
WCAG 2.2 is the current standard (October 2023). Most organizations should target Level AA compliance, which is required by ADA, Section 508, and most accessibility laws. Key requirements include: 4.5:1 color contrast, keyboard accessibility, alt text for images, and proper heading structure.
The Web Content Accessibility Guidelines (WCAG) are international standards developed by the W3C Web Accessibility Initiative (WAI). WCAG provides a comprehensive framework for making web content accessible to people with disabilities, including those with visual, auditory, motor, and cognitive impairments.
WCAG is the foundation for accessibility laws worldwide, including:
Latest version with 9 new success criteria focused on mobile accessibility, cognitive disabilities, and vision impairments. This is the recommended target for new projects.
New criteria include: Focus Not Obscured, Dragging Movements, Target Size (Minimum), Consistent Help, Accessible Authentication, and more.
Added 17 success criteria for mobile, low vision, and cognitive accessibility. Still widely used in legal requirements and forms the baseline for many accessibility audits.
Original standard with 61 success criteria. Still referenced in many laws and forms the core of all WCAG 2.x versions.
Content must be presentable in ways users can perceive.
UI components must be operable by all users.
Content and UI must be understandable.
Content must work with assistive technologies.
According to the WebAIM Million study, these are the most frequently encountered accessibility issues:
Use a combination of automated and manual testing for comprehensive coverage:
WCAG (Web Content Accessibility Guidelines) are international standards developed by the W3C Web Accessibility Initiative (WAI) that provide guidelines for making web content accessible to people with disabilities. WCAG is the foundation for accessibility laws worldwide including ADA, Section 508, and EU accessibility requirements.
WCAG has three conformance levels: Level A (minimum), Level AA (recommended standard), and Level AAA (highest). Most laws and regulations require Level AA conformance. Each level includes all requirements from levels below it.
WCAG 2.2, released in October 2023, adds 9 new success criteria on top of WCAG 2.1. The new criteria focus on mobile accessibility, users with cognitive disabilities, and users with low vision. WCAG 2.2 is backward compatible with 2.1.
The four WCAG principles are POUR: Perceivable (users can perceive content), Operable (users can navigate and interact), Understandable (content is clear and predictable), and Robust (content works with assistive technologies).
For WCAG 2.2 Level AA, normal text requires a contrast ratio of at least 4.5:1 against its background. Large text (18pt or 14pt bold) requires a minimum ratio of 3:1. Level AAA requires 7:1 for normal text.
Use a combination of automated tools (axe, WAVE, Lighthouse) and manual testing. Automated tools catch about 30-40% of issues. Manual testing should include keyboard navigation, screen reader testing (JAWS, NVDA, VoiceOver), and testing with real users with disabilities.
WCAG 3.0 (W3C Accessibility Guidelines) is in development, featuring a new outcome-based testing model, broader scope beyond web content, more granular scoring, and greater flexibility in conformance. Expected to reach recommendation status in 2026.