Cant someone take a look at the buttons before the large project ships? Alternatively make it mandatory to never have black text on a dark button and tell every team member including the large ones.

Interesting to read about the perceptual contrast vs mathematical - I did not know that. Going to integrate that into my workflow.

- Their work does ensure contrast.

- The white on blue clearly has less contrast, not more. (squinting is a cheap way to test, or, walking backwards from your monitor)

With APCA, backgrounds around L* 60 tend to still allow white foregrounds, which is aesthetically closer to what the eye wants.

A black foreground would have more contrast regardless, even by APCA.

To be fair, this is how APCA is almost always demonstrated as a win over the long-running standard, so people run with the premise that the demo image of APCA is more contrast, rather than "ours say you'll have enough contrast to be accessible with a white foreground, even if it also says the contrast would be higher with a black foreground".

(source: in 2020 built color system around the same science, enabling latest iterations of Material theming)

  --text: lch(from var(--bg) calc((49.44 - l) * infinity) 0 0);

"Color Wheel: The Basic Color Theory for Artists and Designers" https://dessign.net/color-wheel-theory/

https://youtu.be/tUJvE4xfTgo?si=vFlegFA_7lzijfSR (warning: video is in Portuguese)