:user-valid and :user-invalidThe :user-valid and :user-invalid pseudo-classes match form controls that have been marked as valid or invalid based on their validation constraints.selectorsSelectorswidely2023-11-022026-05-02https://drafts.csswg.org/selectors-4/#user-pseudoshttps://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/:user-validcss.selectors.user-invalidcss.selectors.user-validhttps://nowyoucanuse.com/features--user-pseudos.html