Useful accessibility resources
A whoooole bunch of links about inclusive design, gathered together from a presentation.
Color and Contrast.com
A lovely website (or web book?) dedicated entirely to colour contrast, complete with interactive illustrative widgets.
A comprehensive guide for exploring and learning about the theory, science, and perception of color and contrast.
Related links
Programming Design Systems
This is a really intriguing book that combines design theory and programming—learn about contrast, colour, and shapes, with each lesson supported by code examples.
It’s still a work in progress but the whole thing is online for free. Yay for web books!