JSFiddle - React, Tailwind, and code Playground
HTML
<style>
h3 { margin: 0; }
div,span,p {
width: 80px;
height: 40px;
float:left;
padding: 10px;
margin: 10px;
background-color: #EEEEEE;
}
</style>
<body>
<div>DIV</div>
<span>SPAN</span>
<p>P <button>Button</button></p>
<script>
var elementCount = $("*").css("border","3px solid blue").length;
$("body").prepend("<h3>" + elementCount + " elements found</h3>");
</script>
</body>