The CSS Color 4 already have an OkLAB and OkLCH which is great step forward, but it turned out not everyone is aware @bottosson have created OkHSL and OkHSV as well. This color spaces combines the benefits of HSL and OkLAB:

1. Human friendly — it is easy to calculate or build a desired color just looking at numbers without having a PhD in physics
2. Scripting ability — generate color palettes just by rotating an H component
3. a11y — possibility to derive a color with exact desired color contrast

The only downside: unlike OkLAB, OkHSL is limited to sRGB and i'm not sure if it possible to scale it to the wide gamut. Anyway, it worth to at least discuss this.

@LeaVerou