JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://www.google.com/images/logos/ps_logo2.png" />

JavaScript

var images = document.getElementsByTagName('img');

for(var i = 0, l = images.length; i < l; i++){
     var im = images[i],
         w = im.offsetWidth,
         h = im.offsetHeight;
    
    if(w & h){
         im.src = 'http://placekitten.com/'+w+'/'+h;       }
}