:nth-of-type() pseudo-classesThe :nth-of-type() and :nth-last-of-type() CSS functional pseudo-classes match elements based on their position among siblings of the same type. The :first-of-type, :last-of-type, and :only-of-type pseudo-classes match the first, last, and only elements of its type.selectorsSelectorswidely2015-07-292018-01-29https://drafts.csswg.org/selectors-4/#typed-child-indexhttps://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/:nth-of-typecss.selectors.first-of-typecss.selectors.last-of-typecss.selectors.nth-last-of-typecss.selectors.nth-of-typecss.selectors.only-of-typehttps://nowyoucanuse.com/features--nth-of-type.html