W3C: Developing Web Accessibility Presentations and Training
The Web Accessibility Initiative (WAI) offers materials for speakers, lecturers, educators, and other presenters to help their participants understand more about web accessibility. The materials provide a range of information from introductory slides for those new to accessibility, to statistics and demos for experienced trainers.
WebAIM: Web Accessibility Training
This training session will teach everything from basic web accessibility principles to advanced accessibility techniques. Learn what you need to know to ensure that your web site meets legal guidelines and international standards.
MDN: ARIA Screen Reader Implementors Guide
Details for Processing ARIA Live Regions via Platform Accessibility Programming Interfaces (APIs). Interpreting WAI-ARIA live region markup varies with screen reader and browser agents. ARIA Live region markup is a complex area which is somewhat open to interpretation. This guide is intended to provide implementation guidance that respects screen readers developers’ need to try different things. The intention is to strike a balance between providing useful guidance on how to use the markup’s intended meaning while supporting live regions as an area for screen readers to innovate and compete.