You look at the monstrosity that is the CSS spec(s), filled to the brim
with horrible ideas like floats, the various overcomplicated positioning
modes that no mortal can hope to ever fully understand, and undefined
behavior left and right in general. And the "bloat" you end up singling
out is... an addition to the otherwise 147 entries long color name
table.[0]
Your list includes all 140 CSS named colors, so as per CSS Color Module Level 3, it is exhaustive. Your list has duplicates which are valid because both American and British spellings are recognized, e.g. "darkgray" and "darkgrey".
If it is not limited to CSS, then you are missing X11 colors (around ~256), for example, although some overlap with CSS colors.
If interested, Gpick can serve as a starting point.
That's just bizarre.
[0]: at least when I was implementing it: https://git.sr.ht/~bptato/chawan/tree/351f2f51322c2fa291772c... perhaps there's more now...