源代码 ：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>开源教程(ossoft.cn)</title> <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 教程:</h1> <h2>HTML 教程</h2> <h2>CSS 教程</h2> <h1>Scripting 教程:</h1> <h2>JavaScript</h2> <h2>VBScript</h2> <h1>XML 教程:</h1> <h2>XML</h2> <h2>XSL</h2> <p><b>注意:</b> IE8 需要指定 !DOCTYPE 才可以支持该属性。</p> </body> </html>
运行结果