JSFiddle - React, Tailwind, and code Playground

HTML

<div id="peter"></div>

<div id="out"></div>

CSS

#peter {
    border: 1px solid red;
    border: none;
    width: 100px;
    height: 100px;
}

JavaScript

var borderTopWidth = $( "#peter" ).css( "borderTopWidth" );
var borderTopStyle = $( "#peter" ).css( "borderTopStyle" );
var height = $( "#peter" ).height();

$( "#out" ).text( "width: " + borderTopWidth + ", style: " + borderTopStyle + ", height: " + height );