This page collects HTML examples to test out different variants with a screenreader.
Test out how a list of articles works with HTML
Test out how to represent labelled information
Make sure Pagination via a "Show More" button is screen reader accessible
Collapsing and Expanding Content
Multi-select options within a dialog Popup
Correctly set
aria-busy
when dealing with multiple promises
Providing search suggestions accessibly in a dropdown
Implementing a Navbar with a lot of Submenus
Presentations
Additionally, I have prepared some sites/slides on the topic.
How to Not Fail at Building Accessible Web Applications