JSFiddle - React, Tailwind, and code Playground

HTML

<div id="theVictim"></div>

CSS

#theVictim {
    width: 100px;
    height: 100px;
    background: gainsboro;
}

JavaScript

var optionalSelector = "$";

(function() {
	(this[arguments[0]] = function constructor(input) {
		if (!(this instanceof constructor)) { return new constructor(input); }
		this.elm = document.getElementById(input);
	}).prototype = {
		blink:		function() {
						function changeDisplay() {
							if (this.elm.style.display != "none") {
								this.elm.style.display = "none";
							} else {
								this.elm.style.display = "block";
							}
						}
						setInterval(changeDisplay, 1000);
					},
	};
})(optionalSelector);

$("theVictim").blink();