I just found out that `lch()`, `lab()`, `oklch()` and `oklab()` are already supported in Safari (stable)[1].

The normal versions have a white point of 50 and the ok versions have a white point of 65, which is the same as sRGB[2].

[1]: https://wpt.fyi/results/css/css-color?label=stable&label=mas...

[2]: https://bottosson.github.io/posts/oklab/