Use case

The WAI-ARIA property aria-describedby must be available on all Flutter component types/widgets to provide more information about an element that the user might need.

Proposal

Add the WAI-ARIA property aria-describedby to the list of semantics flags on all Flutter component types/widgets. Its value must only be the ID of another text string element on the page (text strings are not a valid value for aria-describedby). Multiple ID's can be listed (each separated by a single space) in order to form a single accessible description.

Examples:

aria-describedby="text1"
aria-describedby="text1 text2 text3"