JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://placekitten.com/400/300" height="30" width="40" id="kitteh" />
<p>Height: <span id="height"></span></p>
<p>Width: <span id="width"></span></p>

JavaScript

$(function() {
   var img = $('#kitteh');
   var hiddenImg = img.clone().css('visibility', 'hidden').removeAttr('height').removeAttr('width').appendTo('body');
    $('#height').text(hiddenImg.height());
    $('#width').text(hiddenImg.width());
    hiddenImg.remove();            
});