There has been a lot of work put into making the Navigation block (and its principle child blocks) as accessible as possible.

That said, we can always do better.

Nav block specific

Here are a list of current known Issues with the block (based on this filter). We will augment this list as necessary as we move towards WP 6.0.

• Focus is lost after selecting option from "Select Menu" dropdown #38169
• Navigation block should be identifiable with aria-label #24369
• useNoRecursiveRenders can cause all of its children to be unmounted from the DOM #39044
• Navigation block not focused on setup #39301

Wider editor issues

These fixes are not specific to the Nav block but if resolved will contribute back to the a11y of the block.

• Navigation menu block: blue selection border is inconsistent with other blocks #20808
• Fix useFocusFirstElement in non-contenteditable Blocks #37934