h2::before {
  counter-increment: h2;
  content: counter(h2) "\3000";
}

#sec\.ref::before {
  content: none;
}

#sec\.toc::before {
  content: none;
}

h3::before {
  counter-increment: h3;
  content: counter(h2) "." counter(h3) "\3000";
}