Voici l'approche CSS pure pour la numérotation des titres.

Le code CSS qui suit numérote tous les titres du wiki, ainsi que ceux de la table des matières.

Placez-le dans l'un des CSS du répertoire user de votre thème (ainsi qu'à nouveau dans le print.css pour avoir la numérotation lors de l'impression)

/lib/tpl/THEME/user/screen.css

/* Numérotation automatique des titres via CSS 
https://philarcher.org/diary/2013/headingnumbers/ */
 
body {counter-reset: h2}
h2 {counter-reset: h3}
h3 {counter-reset: h4}
h4 {counter-reset: h5}
h5 {counter-reset: h6}
 
h2:before {counter-increment: h2; content: counter(h2) ". "}
h3:before {counter-increment: h3; content: counter(h2) "." counter(h3) ". "}
h4:before {counter-increment: h4; content: counter(h2) "." counter(h3) "." counter(h4) ". "}
h5:before {counter-increment: h5; content: counter(h2) "." counter(h3) "." counter(h4) "." counter(h5) ". "}
h6:before {counter-increment: h6; content: counter(h2) "." counter(h3) "." counter(h4) "." counter(h5) "." counter(h6) ". "}
 
h2.nocount:before, h3.nocount:before, h4.nocount:before, h5.nocount:before, h6.nocount:before, #dw__toc h3:before, #panel h5:before { content: ""; counter-increment: none }
 
/* Numérotation automatique de la table des matières (TOC) via CSS
https://www.freecodecamp.org/news/numbering-with-css-counters/ */
.dokuwiki #dw__toc ul ul {
  list-style-type: none;
  counter-reset: css-counters 0; /* intializes counter, set -1 for zero-based counters */
}
 
.dokuwiki #dw__toc ul ul li div.li:before {
  counter-increment: css-counters;
  content: counters(css-counters, ".") " "; /* generates inherited counters from parents */
}
 
/* Styles des titres */
div#content .dokuwiki h1,
div#content .dokuwiki h2 {
  font-weight: bold;
}
 
div#content .dokuwiki h3,
div#content .dokuwiki h4,
div#content .dokuwiki h5,
div#content .dokuwiki h6 {
  font-weight: normal;
}
 
div#content .dokuwiki h1 {
  font-size: 160%;
}
 
div#content .dokuwiki h2 {
  font-size: 140%;
}
 
div#content .dokuwiki h3 {
  font-size: 132%;
}
 
div#content .dokuwiki h4 {
  font-size: 116%;
}
 
div#content .dokuwiki h5 {
  font-size: 100%;
}
 
div#content .dokuwiki h6 {
  font-size: 80%;
}

• (en) https://www.dokuwiki.org/start?id=tips:numbered_headings

Basé sur « Numbered headings per CSS only » par Geabulek.