CSS Color

/* alpha syntax */
color: rgba(255, 0, 255 / 75%); /* vs. rgba(…) */
color: rgba(255, 0, 255 / .75);

/* (HDR) color modes */
color: color(display-p3 1 0 1); /* vs. #F0F */

/* new color functions */
color: oklch(71.5% 0.35 330); /* vs. #F0F */

/* utilities */
color: color-mix(in lch, #F0F, white 20%);

/*
 * keep a tab on …  
 */

/* relative color syntax */
color: lch(from #F0F l calc(c + 75) h); /* increaces chroma by 75 */

/* color contrast */ 
color: color-contrast(var(--bg) vs #F0F, hotpink); /* pick the color that contrasts the most with --bg, choose between #F0F and hotpink)