CSS counters are variables that are maintained and manipulated by CSS rules to count the number of times they have been used within the document using the counter-increment, counter-set, counter-reset properties, and read with counter() and counters(). Their value is inaccessible outside of CSS and are generally used as pseudo-element content. Add this tag for questions relating to the usage of CSS counters. For other types of counters, use the [css] tag.