<!doctype html>
<meta charset="utf-8">
<title>CSS Selectors Invalidation: :nth-last-child(... of class) when ancestor changes</title>
<link rel="author" title="Zach Hoffman" href="mailto:zach@zrhoffman.net">
<link rel="author" title="Steinar H. Gunderson" href="mailto:sesse@chromium.org">
<link rel="match" href="nth-last-child-when-ancestor-changes-ref.html">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#child-index">
<style>
  .ancestor :nth-last-child(even of .c) {
    color: green;
  }
</style>
<div id="toggler">
  <p>Ignored</p>
  <p class="c">Not ignored</p>
  <p class="c">Not ignored</p>
  <p class="c">Not ignored</p>
  <p class="c">Not ignored</p>
  <p>Ignored</p>
</div>
<script>
  document.documentElement.offsetTop;
  toggler.classList.toggle("ancestor");
</script>
