JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<script type="text/javascript">
  $('<div class="ch"><span class="chh">chapter 1</span></div>').appendTo("body");
  $('<div class="ch"><span class="chh">chapter 2</span></div>').appendTo("body");

  var a = $("body > .ch:last");
  
  document.body.innerHTML += (
    a.prevAll(".ch:first .chh").length +"<br>");
  document.body.innerHTML += (
    $(".ch:first .chh").length);
</script>
</body>