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body
  {
  counter-reset:section;
  }

h1
  {
  counter-reset:subsection;
  }

h1:before
  {
  content:"Section " counter(section) ". ";
  counter-increment:section;
  }

h2:before
  {
  counter-increment:subsection;
  content:counter(section) "." counter(subsection) " ";
  }

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CSS ²Î¿¼Êֲ᣺CSS :before Î±ÔªËØ

CSS ²Î¿¼Êֲ᣺CSS :after Î±ÔªËØ

CSS ²Î¿¼Êֲ᣺content ÊôÐÔ

CSS ²Î¿¼Êֲ᣺counter-increment ÊôÐÔ

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