As a designer, I’d like to see the colour contrast ratios and WCAG AA/AAA pass/fail information for the selected control if applicable.
One of my tasks when I’m creating user interfaces is to check the colour contrast ratios of my design elements. Currently, I use other apps or browser dev tools to figure this out and then pick the appropriate colours in Balsamiq Wireframes.
This would admittedly be most useful for buttons or other objects where you have a background and foreground colour
I use WebAIM: Contrast Checker for the contrast info, so that’s what I’ve mocked up below.