JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">

CSS

div { border: solid 1px #ddd; }

JavaScript

for(var $i = 1; $i < 22; $i++) {
  $(document.body).append('<div id="number' + $i + '" class="number" style="display:none">' + $i + '</div>');
}
$('.number').each(function(i) {
  $(this).delay(600*i).slideDown("slow");  
});