:host-context()The :host-context() CSS pseudo-class selects the containing element of the shadow tree in which it is used if that element or an ancestor matches the provided selector.selectorsSelectorslimitedhttps://drafts.csswg.org/css-shadow-1/#host-selectorhttps://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/:host-contextcss.selectors.host-contexthttps://nowyoucanuse.com/features--host-context.html