:focus-withinThe :focus-within CSS pseudo-class matches an element if the element or any of its children are focused.selectorsSelectorswidely2020-01-152022-07-15https://drafts.csswg.org/selectors-4/#the-focus-within-pseudocss-focus-withinhttps://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/:focus-withincss.selectors.focus-withinhttps://nowyoucanuse.com/features--focus-within.html