CSS: percent symbol in translateX(-50%) highlights as error

[Akuli]

Minimal reproducer: (output contains (Token.Error, '%'), but it IMO shouldn't)

>>> import pygments
>>> from pygments.lexers import CssLexer
>>> import pprint
>>> pprint.pprint(list(pygments.lex('foo { transform: translateX(-50%); }', CssLexer())))
[(Token.Name.Tag, 'foo'),
 (Token.Text.Whitespace, ' '),
 (Token.Punctuation, '{'),
 (Token.Text.Whitespace, ' '),
 (Token.Keyword, 'transform'),
 (Token.Punctuation, ':'),
 (Token.Text.Whitespace, ' '),
 (Token.Name.Builtin, 'translateX'),
 (Token.Punctuation, '('),
 (Token.Name.Variable, '-50'),
 (Token.Error, '%'),
 (Token.Punctuation, ')'),
 (Token.Punctuation, ';'),
 (Token.Text.Whitespace, ' '),
 (Token.Punctuation, '}'),
 (Token.Text.Whitespace, '\n')]
>>> 

[birkenfeld]

What version are you using? This was fixed in #2383.