JSFiddle - React, Tailwind, and code Playground

HTML

<style type="text/css"><!--
.spn { color:blue; font-weight:bold; }
--></style>
<script type="text/javascript"><!--
$(document).ready(function() {
  var new_btn = $('<button id="btn">Click</button>');          // new button
  var new_span = $('<span>START</span>').addClass('spn');      // new <span> with class="spn"

  new_btn.insertAfter('#idd');        // insert the new button after the tag with id="idd"

  // now we use the new added button, when is clicked
  $('#btn').click(function() {
    // insert the "new_span" at the beginning inside all DIVs with class="cls"
    new_span.prependTo('div.cls');
  });
});
--></script>

<div class="cls"> Create and insert new HTML items with jQuery</div>
<div class="cls" id="idd"> coursesweb.net</div>