JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<img id='imageID' src='http://dummyimage.com/300x200/000/fff.png' />

<div id='info'></div>

JavaScript

$(window).load(function() {
var img = $('#imageID');
var width = img.width();
var height = img.height();
$('#info').html(width+'.. height: '+height);
    
});