JSFiddle - React, Tailwind, and code Playground

HTML

<div id="yourId">This is some div</div>

CSS

div {
    padding: 20px;
    border: 1px solid #01f;
    width: 150px;
}

strong {
    display: block;
}

JavaScript

$example = $('#yourId');

$example.append("<strong>InnterWidth:</strong>" + $example.innerWidth() + "<strong>Width:</strong>" + $example.width() );