CSS now supports color spaces that allow us to access colors outside of the sRGB gamut. This means that you can support HD (high definition) displays, using colors from HD gamuts. This support comes with new functions to make better use of color on the web.
We already have a number of functions that allow us to access colors within the sRGB gamut—rgb(), hsl(), and hwb(). Now supported in browsers is the color() function, a normalized way to access colors within any RGB color space.
You can see some examples in the following CSS:
.valid-css-color-function-colors {
--srgb: color(srgb 1 1 1);
--srgb-linear: color(srgb-linear 100% 100% 100% / 50%);
--display-p3: color(display-p3 1 1 1);
--rec2020: color(rec2020 0 0 0);
--a98-rgb: color(a98-rgb 1 1 1 / 25%);
--prophoto: color(prophoto-rgb 0% 0% 0%);
--xyz: color(xyz 1 1 1);
}