JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdn.bootcss.com/flag-icon-css/2.8.0/css/flag-icon.css">

<i class="flag-icon flag-icon-it"> </i>
<i class="flag-icon flag-icon-XX"> </i>
<i class="flag-icon flag-icon-co"> </i>

JavaScript

var ele = document.getElementsByTagName('i');


	for(var i=0; i< ele.length; i++){
  	var img = ele[i];
  	style = img.currentStyle || window.getComputedStyle(img, false);
    if (style.backgroundImage === 'none'){
    	console.log("No Flag!!!");
    }
  }