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chromium/third_party/blink/web_tests/external/wpt/css/selectors/invalidation/nth-child-containing-ancestor.html 

<!DOCTYPE html>
<meta charset="utf-8" />
<title>CSS Selectors Invalidation: :nth-child(... of S) with ancestor in S</title>
<link rel="author" title="Steinar H. Gunderson" href="[email protected]">
<link rel="match" href="nth-child-containing-ancestor-ref.html">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#child-index">
<style>
  div:nth-child(odd of .a .b) {
    color: green;
  }
</style>
<div id="toggler">
  <div>
    <div>
      <div class="b">Should be green</div>
    </div>
  </div>
</div>
<script>
  document.documentElement.offsetTop;
  toggler.classList.toggle("a");
</script>