[css-selectors-4] user-error is listed as a pseudo class when it should read :user-invalid

[estelle]

https://drafts.csswg.org/selectors-4/#user-pseudos - is it :user-invalid. There are several occurrences of :user-error

[Loirooriol]

Already reported in #1329

[fantasai]

Fixed, thanks! b3d287c