The documentation about Testing for web accessibility is now published on the WP Accessibility Knowledge Base. There you can find information about:
- Checklists for the Web Content Accessibility Guidelines
- Automated accessibility testing
- Content checks for web accessibility
- Design checks for web accessibility
- Frontend checks for web accessibility
- Keyboard only
- Screen reader
- WordPress plugins for testing
Note: The documentation in the WP Accessibility Knowledge Base is in development and will be moved to develop.wordpress.org when it’s finished.