JSFiddle - React, Tailwind, and code Playground

HTML

<img onload="imged()" src="http://placehold.it/100x100" id="im">

JavaScript

var size = 100;
function imged() {
    alert('onloaded');
    size+=5;
    document.getElementById('im').setAttribute("src","http://placehold.it/" + size + "x" + size); 
}