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">
<ul id="main">
 <li>   
    <a href="#"></a>
    <ul>
      <li><a href="#"></a></li>
      <li><a href="#"></a></li>
      <li><a href="#"></a></li>
    </ul>
    </li>
</ul>

JavaScript

var el = document.getElementById("main").getElementsByTagName("*");


for (var i=0; i<el.length; i++) {
    alert(el[i].tagName);
}