Ensure that people can visually identify the boundaries of the clickable or tappable area of a component.
Why this matters
Trying to click a component when you can’t tell where the edges are is frustrating and wastes everyone’s time. It’s doubly bad when you’re already working with a disability in place.
How to implement
Read Using color, specifically the section on UI Components.
Ensure you implement the colors provided by the Designer.
How to test