JSFiddle - React, Tailwind, and code Playground

JavaScript

var imgSrc='http://a2.twimg.com/profile_images/1214762676/NBATwitter_75x75_normal.jpg';
$('<img/>').load(function(){
    var elem=$(this);
    alert((elem.width()||elem.attr('width'))+'_'+(elem.height()||elem.attr('height')));
}).attr('src',imgSrc);