The concept of a parent selector in css<\/a> has been a highly requested feature for decades. Traditionally, CSS only allowed for downward traversal of the dom<\/a>, meaning styles could be applied to children based on their parents, but not vice versa. The introduction of the has-pseudo-class<\/a>, often called the relational pseudo-class, finally solved this limitation.<\/p> According to the w3c<\/a> specifications, the Beyond simple parent-child relationships, :has()<\/code> selector allows an element to be selected if it contains a descendant that matches a specific criteria. As noted by MDN Web Docs<\/a>, this provides a way to style a container based on its content, which is essential for modern user-interface<\/a> patterns. For example, a card component can be highlighted only if it contains specific html-elements<\/a> like an icon or a button.<\/p>:has()<\/code> can be used with various combinators<\/a> to create complex logic. CSS-Tricks<\/a> highlights that this selector effectively replaces many common javascript<\/a> patterns used for state-based styling. While supported in most modern web-browser<\/a> versions, it is part of the css-selectors-level-4<\/a> module.<\/p>