Archived:
🚚 This content is being maintained elsewhere. Our notes are likely out-of-date.
See the official Sass proposal for details.
Historically
CSS has been limited to a single color model (RGB)
and gamut (sRGB).
Authors have various formats to describe colors in that gamut –
using cubic hex notation #rgb/#rrggbb/#rrggbbaa
and functions rgb()/rgba(),
or cylindrical/polar-angle functions hsl()/hwb().
Unfortunately, sRGB is a relatively narrow color gamut,
and RGB isn’t a perceptually uniform model.
Many monitors now support wider color gamuts
(such as the popular display-p3),
and there has also been significant progress
in developing more perceptually uniform color spaces
such as CIE LAB/okLAB.
The CSS Colors level 4 specification
describes how CSS authors can access these newer gamuts & formats –
with okLAB as the default space for color-mixing.
We want to provide support for this in Sass:
with server-side tools to manage colors across spaces,
and convert colors between spaces where appropriate.