counter-reset - 创建或重置计数器
counter-increment - 增加计数器值
content - 插入生成的内容
counter()或counters()函数 - 将计数器的值添加到元素
body {
     counter-reset: section;
}
h2::before {
     counter-increment: section;
     content: "选项 " counter(section) ": ";
}
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) " ";
}ol {
  counter-reset: section;
  list-style-type: none;
}
 
li::before {
  counter-increment: section;
  content: counters(section,".") " ";
}| 属性 | 描述 | 
|---|---|
| content | 与::before和::after伪元素一起使用,插入生成的内容 | 
| counter-increment | 递增一个或多个计数器值 | 
| counter-reset | 创建或重置一个或多个计数器 | 
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