Css counters

body {
  counter-reset: section;                    /* On initialise le compteur à 0 */
}

h3::before {
  counter-increment: section;                /* On incrémente le compteur section */
  content: "Section " counter(section) " : "; /* On affiche le compteur */
}

Source: developer.mozilla.org

Counter-style counter css counters

@counter-style circled-alpha {
  system: fixed;
  symbols: Ⓐ Ⓑ Ⓒ Ⓓ Ⓔ Ⓕ Ⓖ Ⓗ Ⓘ Ⓙ Ⓚ Ⓛ Ⓜ Ⓝ Ⓞ Ⓟ Ⓠ Ⓡ Ⓢ Ⓣ Ⓤ Ⓥ Ⓦ Ⓧ Ⓨ Ⓩ;
  suffix: " ";
}

Source: developer.mozilla.org

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