JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" id="copy" value=" copy "/>

<div id="content">
    <span>here's a span</span>
    <div>and a div</div>
</div>

JavaScript

$(function()  {
    $('#copy').click(function(){
        //var content = $('#content').html();
        //var newdiv = $("<div>");
        //newdiv.html(content);
        //$('#content').after(newdiv);
        //$('#content').clone().attr("id",new Date().getTime()).insertAfter('#content');
      
        for (var j=0; j=3; j++) {
        $('#content').clone().insertAfter('#content'+j).attr("id","trackline"+new Date().getTime());
        }
    });
  });