Given proper class names, that's a more complex example but not ridiculous. If you asked what: .products > .widget:nth-child(3n+2) { margin: -5px -1px -5px

Given proper class names, that's a more complex example but not ridiculous. If you asked what: .products > .widget:nth-child(3n+2) { margin: -5px -1px -5px -10px; } someone would probably be able to say that it has something to do with adding margins to widgets, and maybe even that it only applies to some of them.