JSFiddle - React, Tailwind, and code Playground

CSS

.super {width: 299px; height: 12234px;}

JavaScript

var elem = $("<div class='super'></div>"),
    width = elem.appendTo('body').css('width'),
    height = elem.css('height');
    elem.remove();
   
console.log('width ; '+width);
console.log('height : '+height);