JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Title</h1>
<h2>Subheading</h2>
<p>Paragraph of text...</p>

JavaScript

$('<ol />').append(function(index, html){
    
    var ret = $('<span />');
    $('body>*').each(function(i, el) {
        ret.append( $('<li />').html(this.tagName.toLowerCase()) );
    });
    
    return ret.html();
    
}).appendTo('body');