Colorspace conversion between RGB and HSL library code for AVR microcontrollers | ATmega328P - Liviu Istrate
Adam Argyle on Twitter: "rgb() ⇒ rgba() just to add transparency? 🤢 hsl() ⇒ hsla() ... 😭 GOOD NEWS! fixed in CSS color-level-4, rgb() & hsl() accept a 4th parameter 🎉 color