CSS counter-reset

Also see the full, alphabetical list of CSS properties

The CSS counter-reset property assists in generating automatic numbering (for example, Heading 1, Section 1.1, Heading 2, Heading 2.2 etc) by resetting the count as required. The counter-reset property is used in conjunction with the CSS count() function of the 'content' property (which is used with the ':before' or ':after' pseudo-elements).

Also see the counter-increment and content properties.

h1 {
    counter-reset: section;
}

Also see all CSS properties listed alphabetically