CSS counter-increment 属性

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) " ";
}