Test page: https://learn.wordpress.org/test/wordpress-playground-block-plugin-test-page/

Currently, the aria-autocomplete="list" value is set for the code editor. According to specification, if this is set, a few different attributes also need to be set.

Docs: https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-autocomplete

I find it odd that autocomplete="off" is set as well. Does the editor currently support suggestions? If so, please modify the ARIA attributes to correctly convey to assistive tech what is happening.