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<!DOCTYPE html> <html> <head> <title>Titre du document</title> <style> body { /* Set "section" to 0 */ counter-reset: section; } h2 { /* Set "subsection" to 0 */ counter-reset: subsection; } h2::before { counter-increment: section; content: "Book " counter(section) ": "; } h3::before { counter-increment: subsection; content: counter(section) "." counter(subsection) " "; } </style> </head> <body> <h2>HTML</h1> <h3>Bases HTML</h2> <h3>Gabarits HTML</h2> <h3>Références HTML</h2> <h3>Tags HTML </h2> <h2>CSS</h1> <h3>Bases CSS </h2> <h3>Références CSS</h2> <h3>CSS Avancé</h2> <h3>Guides CSS </h2> <h3>Sélécteurs CSS </h2> <h3>Propriétés CSS </h2> </body> </html>