JSFiddle - React, Tailwind, and code Playground

HTML

<div id="paper"></div>

JavaScript

var paper = new Raphael("paper", 400, 400);
var outerRect = paper.rect(10,10,100,100);
var innerRect = paper.rect(20,20,20,20);
innerRect.hover(function(event){
    alert("Hover!");
});