š New in High Baseline Support: :indeterminate
July 15, 2022
caniuse Ā· mdn Ā· [spec]([āhttps://drafts.csswg.org/selectors-4/#indeterminateā, āhttps://html.spec.whatwg.org/multipage/semantics-other.html#selector-indeterminateā])
The :indeterminate
CSS pseudo-class selects any form element whose state is indeterminate, such as checkboxes that have been set to an indeterminate state with JavaScript, or radio buttons which are members of a group in which all radio buttons are unchecked.