CSS Counters are similar to variables. It allows to number a list of element. It is also supported by vast number of browsers IE, Edge, Firefox, Chrome, Safari & Opera. CSS counters can be used to order   It can be used in various ways to dynamically manage the information with sequential number with prefix or suffix content. It is a great addon for css authors if they are working on a content which include table of content, chapters heading and the numbering is been prefered to be handled by dynamically, rather fixing the numbers manually at each location/line in the code.