Accessibility Knowledge Base
Comprehensive guides and references for WCAG 2.0, 2.1, and 2.2 success criteria. Each article covers what the rule means, why it matters, how to test, and how to fix violations.
WCAG Rules
View all 87 rules →Non-text Content
All non-text content presented to the user has a text alternative that serves the equivalent purpose.
Audio-only and Video-only (Prerecorded)
Prerecorded audio-only and video-only content must have text alternatives that convey equivalent information to users who cannot perceive the original media.
Captions (Prerecorded)
Captions must be provided for all prerecorded audio content in synchronized media, enabling deaf and hard-of-hearing users to access the audio information.
Audio Description or Media Alternative (Prerecorded)
An alternative for time-based media or audio description of the video content must be provided for prerecorded synchronized media, unless the media is a media alternative for text.
Captions (Live)
Captions must be provided for all live audio content in synchronized media, ensuring real-time access for deaf and hard-of-hearing users.
Audio Description (Prerecorded)
Audio description must be provided for all prerecorded video content in synchronized media, describing important visual information not available from the audio track alone.
Guides
View all guides →Inclusive Design Principles
The seven principles of inclusive design — how to move beyond compliance-driven accessibility to build products that work better for everyone from the start.
Accessibility Statement Template
How to write a legally compliant, transparent accessibility statement — what to include, how to maintain it, and a complete template for EU and global compliance.
WCAG Conformance Levels Explained
A clear explanation of WCAG A, AA, and AAA conformance levels — what each level covers, what the law requires, and how to plan your conformance target.
Accessibility Testing Workflow
Build a repeatable, efficient accessibility testing workflow that combines automated scanning, manual testing, and user testing — from design handoff to production.
Forms Accessibility Patterns
Accessible form design patterns — labels, error handling, grouping, autocomplete, and validation — with code examples for common form components.
ARIA Roles and Properties Reference
A practical reference for WAI-ARIA roles, states, and properties — when to use ARIA, which roles require keyboard patterns, and the five rules of ARIA.