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chromium/third_party/blink/web_tests/external/wpt/css/selectors/invalidation/nth-child-of-class-prefix.html 

<!DOCTYPE html>
<meta charset="utf-8" />
<title>CSS Selectors Invalidation: :nth-child(... of class prefix)</title>
<link rel="author" title="Zach Hoffman" href="mailto:[email protected]">
<link rel="match" href="nth-child-of-class-ref.html">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#child-index">
<style>
  p:nth-child(even of [class^=t]) {
    color: green;
  }
</style>
<div>
  <p>Ignored</p>
  <p>Ignored</p>
  <p class="t1">Not ignored</p>
  <p id="toggler" class="t2">Selectively ignored</p>
  <p class="t3">Not ignored</p>
  <p class="t4">Not ignored</p>
  <p class="t5">Not ignored</p>
  <p>Ignored</p>
</div>
<script>
  document.documentElement.offsetTop;
  toggler.setAttribute("class", "new-class");
</script>