:emptyThe :empty CSS pseudo-class matches elements without child elements.selectorsSelectorswidely2015-07-292018-01-29https://drafts.csswg.org/selectors-4/#the-empty-pseudohttps://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/:emptycss.selectors.emptycss.selectors.empty.matches_whitespacehttps://nowyoucanuse.com/features--empty.html