Well done, these are helpful accessibility changes! :) What would be a great addition is to allow writers to organize their writing better. This would make it easy for readers to understand the structure of a piece. And would make a huge difference especially for people using screen readers to scan articles.

One important function that's missing and will help them do this is having H1, H2, and H3 markup.

In Medium articles, titles are H1 - great! Yet subheading options are H1 and strong. There should only ever be one H1 on a page.

This will allow writers to format their writing semantically, just as we can do in Word. Here's the W3C guide about this: https://www.w3.org/WAI/tutorials/page-structure/headings/

W3C can be quite stringent with accessibility guidelines and it can be hard for organizations to comply - but this is one of the most basic ones.

Let me know if you have any questions about this. Happy to clarify.

Thank you for your work in this area. It means many more people can enjoy the quality content and wonderful Medium :community :)