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<html><head><style>body { counter-reset: section;}h1 { counter-reset: subsection;}h1::before { counter-increment: section; content: "Section " counter(section) ". ";}h2::before { counter-increment: subsection; content: counter(section) "." counter(subsection) " ";}</style></head><body><h1>HTML учебники:</h1><h2>HTML Учебник</h2><h2>CSS Учебник</h2><h1>Учебники по написанию скриптов:</h1><h2>JavaScript</h2><h2>VBScript</h2><h1>XML учебники:</h1><h2>XML</h2><h2>XSL</h2></body></html>