How To Use Structural Pseudo Classes and Pseudo Element Selectors | Van SEO Design

Structural pseudo-classes were introduced as a way to target html elements based on information in the document tree that aren’t easily represented by simple selectors or combinators. Most were introduced in css3.

You may already be using a few of these. If you aren’t you likely find yourself wanting to target the elements they select. Without them we generally have to add a class or id to the element we’re targeting.