I’ve implemented[1] some of these algorithms into @texel/color, a modern JS color library, and it also supports gamut mapping to certain wide gamut color spaces (Display P3, Rec2020, Adobe 1998) rather than just sRGB.

https://github.com/texel-org/color

Many popular color libraries (Colorjs.io, culori) attempt to match CSS gamut mapping spec, which is an order of magnitude slower than the approach in Ottosson’s blog post, and also less accurate (CSS gamut mapping may not fall neatly on the gamut boundary).

[1] “Ported” might be a better term as I used a combination of Ottosson’s own JS OKHSL picker, Colorjs.io code, and Coloraide (Python), and adjusted it for performance, more gamuts, and smaller bundle sizes.