Accessible notifications with ARIA Live Regions: @SaraSoueidan shared 2 free text-only excerpts from her Practical Accessibility video course with you on her blog:
- Part 1: https://www.sarasoueidan.com/blog/accessible-notifications-with-aria-live-regions-part-1/
- Part 2: https://www.sarasoueidan.com/blog/accessible-notifications-with-aria-live-regions-part-2/

I bought this course with my own money, so, #NotSponsored, and I can 200% recommend it to any developer who wants to start learning about accessibility.
The course: https://practical-accessibility.today/
https://www.sarasoueidan.com/blog/accessible-notifications-with-aria-live-regions-part-1/