Color function lch() (and probably lab() too) are missing whitespace in space separated values

[zachleat]

https://caniuse.com/css-lch-lab

div { color: lch(67.5345% 42.5 258.2); }

Returns:

div { color: lch(67.5345%42.5 258.2); }

Notably, comma separated values for these functions are invalid.

[zachleat]

Discovered in 11ty/webc#82

[lahmatiy]

From parser's perspective that's not a bug, since can be parsed correctly by any modern browser. Currently a generator emits a whitespace between tokens only when they will produce an another token otherwise. For instance, a whitespace between <ident-token> and <(-token> is required because they will become a single <function-token> otherwise. On other hand, a whitespace between <delim-token> (%) and <number-token> is not needed, since such tokens don't produce an another token.
I guess, you are looking for pretty print serialization. However, it's not implemented yet.