File: nth-child-when-sibling-changes.html

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<!DOCTYPE html>
<meta charset="utf-8" />
<title>CSS Selectors Invalidation: :nth-child(... of class) when sibling changes</title>
<link rel="author" title="Steinar H. Gunderson" href="sesse@chromium.org">
<link rel="match" href="nth-child-when-sibling-changes-ref.html">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#child-index">
<style>
  .sibling + :nth-child(odd of .c) {
    color: green;
  }
</style>
<div>
  <p class="sibling" id="toggler">Ignored</p>
  <p class="c">Odd; used to be green, should not be since no sibling</p>
  <p class="c">Even, so should not be green</p>
  <p class="c" class="sibling">Odd, but no sibling, so should not be green</p>
  <p class="c">Even, so should not be green</p>
  <p class="sibling">Ignored</p>
  <p class="c">Odd, should be green</p>
</div>
<script>
  document.documentElement.offsetTop;
  toggler.classList.toggle("sibling");
</script>