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<!DOCTYPE html> <html> <head> <title>Заголовок документа</title> <style> body { /* Set "section" to 0 */ counter-reset: section; } h1 { /* Set "subsection" to 0 */ counter-reset: subsection; } h1::before { counter-increment: section; content: "Book " counter(section) ": "; } h2::before { counter-increment: subsection; content: counter(section) "." counter(subsection) " "; } </style> </head> <body> <h1>HTML</h1> <h2>HTML Basics</h2> <h2>HTML Templates</h2> <h2>HTML References</h2> <h2>HTML Tags</h2> <h1>CSS</h1> <h2>CSS Basics</h2> <h2>CSS References</h2> <h2>CSS Advanced</h2> <h2>CSS Guides</h2> <h2>CSS Selectors</h2> <h2>CSS Properties</h2> </body> </html>