Tappable targets. All tappable targets should be at least 48x48
pixels.

Errors. Important actions should be able to be undone. In fields
that show errors, suggest a correction if possible.

Color vision deficiency testing. Controls should be usable and
legible in colorblind and grayscale modes.

Scale factors. The UI should remain legible and usable at very
large scale factors for text size and display scaling.

More information

For more information, particularly about how to configure
the semantics tree,
see the following articles written by community members:

A deep dive into Flutter’s accessibility widgets

Semantics in Flutter