nthchildan
nthchildan is a CSS pseudo-class that selects elements based on their position among siblings. It allows developers to style elements that are the nth child of their parent. The 'n' in nthchildan represents a positive integer, a formula, or a keyword. For example, :nth-child(3) selects the third child of its parent. The formula can also be used to select a range of elements. For instance, :nth-child(2n) selects all even-numbered children, and :nth-child(2n+1) selects all odd-numbered children. The keyword 'even' is a shortcut for :nth-child(2n), and 'odd' is a shortcut for :nth-child(2n+1).
The nthchildan pseudo-class is particularly useful for creating alternating row colors in tables, styling every few