I finally fixed Tangerine's oklab color implementation last night, and then went and also implemented oklch and hsl. I really like oklch! It feels like I magically unlocked a bunch of new colors. It's really powerful for generating color pallets.
To any would-be implementors of oklab and oklch, I highly recommend only working from the w3c's CSS4 color specification, and ignore everything else. The spec has a lot of important information that the original oklab blog post glosses over, the spec walks you through actually implementing it, and the standardized version uses a different white point.
Also it's worth noting that MDN's information on oklab is straight up wrong, and firefox doesn't correctly implement the "powerless" cases. 🙃