JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content"></div>
<div class="content"></div>
<div class="content"></div>
<div class="content"></div>
<div class="content"></div>
<div class="content"></div>

Body width is <span id="bodywidth"></span>

CSS

body{
    height: 40px;
}

.content{
    width: 5000px;
    height: 20px;
    background: red;
    margin: 10px;
    float: left;
}

JavaScript

$('#bodywidth').text($('body').css('width'));