
  <p class="c" id="toggler">Selectively 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("c");
</script>
