callback.js

/*
Open a page in Chrome and go to about:blank
Then, in Dev Tools, paste the code below into the console

After 10 seconds you'll see <div id="myElement"> in the console
*/

(win => {
	win.obj = {
		fetch: o => setTimeout(o.success, 10000)
	};
})(window);

(body => {
	// populate the body
	body.innerHTML = `
		<div id="myElement">
			<div id="clickableElement">Click Me</div>
		</div>
	`;

	// get a reference to the DOM element
	const domElement = document.getElementById('myElement');

	// create a callback that contains the reference 
	obj.fetch({ success: () => console.log(domElement) });

	// empty the body
	body.innerHTML = ``;
})(document.body);