CodePen Embed - counter-increment

<h3>W3TR</h3>
<h2>W3TR</h2>
<h3>W3TR</h3>
<h3>W3TR</h3>
<h3>W3TR</h3>

h3 {
  counter-increment: section;
}
h2 {
   counter-increment: subsection;
}

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