(Cascading Style Sheets) CSS 2.1 Reference

Counter-Identifier Values

This value is used to identify the name of a counter. The following example shows a counter used within the CSS content property along with the corresponding counter name used within the CSS counter-increment and counter-reset properties. For this example, the name of the counter is month.

h2:before {content: counter(month);}
h2 {counter-increment: month;}
h1 {counter-reset: month;}