In order to achieve compliance with the new WCAG 2.2 success criteria 2.5.8, this requires pointer inputs (buttons) to be either 24x24 pixels large, or spaced 24 pixels away from other pointer inputs. Most of Sakai follows this criteria, but there’s a few instances, mainly with radio buttons (only 16x16 pixels), that are too small and spaced a little too close (see screenshots for a few examples).

This is a note found on the success criteria’s page:

This Success Criterion defines a minimum size and, if this can't be met, a minimum spacing. It is still possible to have very small, and difficult to activate, targets and meet the requirements of this Success Criterion, provided that the targets don't have any adjacent targets that are too close. However, using larger target sizes will help many people use targets more easily. As a best practice it is recommended to at least meet the minimum size requirement of the Success Criterion, regardless of spacing.