<html><head><style>body { counter-reset: section;}h1 { counter-reset: subsection;}h1:before { counter-increment: section; content: "板块 " counter(section) ". ";}h2:before { counter-increment: subsection; content: counter(section) "." counter(subsection) " ";}</style></head><body><h1>HTML 教程</h1><h2>HTML 教程</h2><h2>XHTML 教程</h2><h2>CSS 教程</h2><h1>Scripting 教程</h1><h2>JavaScript</h2><h2>JQuery</h2><h1>XML 教程</h1><h2>XML</h2><h2>XSL</h2></body></html>