The counter-increment property is intended to increase the value of the increment counter, which is set by the counter-reset property.
This counter counts the number of times elements are rendered on the page, and can be displayed using the content property and the ::after and ::before pseudo-elements. This allows you to create lists (including multi-level ones), in which the numbering and appearance are specified through styles.
counter-increment: [ custom-ident integer? ]+ | none;