Test accessibility with a real user

This has passed AMP testing, which is really good.

It would be even better to test with a real user on assistive technology.

In particular, some of the aria-label stuff us new to me, and I want to make sure it works. I implemented the simplest version of that, but there is another possible way with extra HTML elements being added.

No file or test is named. Start by reviewing the existing aria-label implementation and the alternative involving extra HTML elements, then arrange testing with a real user using assistive technology. Done means the accessibility behavior has been validated and any problems are documented.

Written by the indexing model from the issue text.