JSFiddle - React, Tailwind, and code Playground

HTML

<div id='div1'>
    <div id='div2'>
        test123
    </div>
</div>

CSS

#div1 {
    width:200px;
}

#div2 {
    width:75%;
}

JavaScript

document.write($('#div2').width() + ', ');

$('#div1').css('display' , 'none');

document.write($('#div2').width());