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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/CSS Tutorials</h1><h2>HTML</h2><h2>CSS</h2><h2>Bootstrap</h2><h2>W3.CSS</h2><h1>Scripting Tutorials</h1><h2>JavaScript</h2><h2>jQuery</h2><h2>React</h2><h1>Programming Tutorials</h1><h2>Python</h2><h2>Java</h2><h2>C++</h2></body></html>