JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<head>
<script src="//cdn.jsdelivr.net/npm/phaser@3.11.0/dist/phaser.js"></script>
<script type="text/javascript">
</script>
</head>
<body>
<div id="output">&nbsp;</div>
</body>
</html>

JavaScript

var game = new Phaser.Game({scene: {create: create}});
function create() {
var t1 = this.add.sprite();
var t2 = this.add.sprite();
var t3 = this.add.sprite();
var ts = [t1, t2, t3];
var gp = this.add.group(ts);
document.getElementById("output").innerText = "Count:"+gp.children.size;
}