CodePen Embed - css-nth(n)

<ul>
  <li>3番目の要素以外は適用されない</li>
  <li>3番目の要素以外は適用されない</li>
  <li>3番目の要素だけ適用</li>
  <li>3番目の要素以外は適用されない</li>
</ul>

li:nth-child(3n) {
  color: blue;
}

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