:focus-within

The :focus-within CSS pseudo-class matches an element if the element or any of its descendants are focused. In other words, it represents an element that is itself matched by the :focus pseudo-class or has a descendant that is matched by :focus. (This includes descendants in shadow trees.)

Since CSS has difficulty targeting a 'parent element', this can be a useful tool for styling the parent of a focusable element.

[[css]]