JSFiddle - React, Tailwind, and code Playground

HTML

<div id="counter" style="display:none;position:fixed;top:0px;left:0px;">5</div><br>
<div id="d">Hello</div>

CSS

#d{
    height:2000px;
    width:500px;
}

JavaScript

$(window).scroll(function(){
     if ($(window).scrollTop() > 1400) {
      var max = 67;
      incCounter();
      $('#counter').fadeIn(800);
     }

     function incCounter() {
      var currCount = parseInt($('#counter').html());
      if (currCount != max) {
        $('#counter').html(currCount+1);
        setTimeout(incCounter, 20);
      }
     }
    });