JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="myList" style="width: 150px;">
    <li>itemitemitemitemitemitemitemitemitemitemitemitemitemitem</li>
    </ul>

<div id="answer2"></div>

JavaScript

var totalHeight=0;
$("#myList li").each(function() {
   totalHeight += $(this).outerHeight(true); // to include margins
});

$("#answer2").text("Answer 2: "+totalHeight);