JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://feeds.feedburner.com/nu/dSCF?format=sigpro" type="text/javascript" ></script>
<script src="http://feeds.feedburner.com/nu/DXHx?format=sigpro" type="text/javascript" ></script>

JavaScript

var $feeds = $(".feedburnerFeedBlock li a");
var debug = true;
var dupliCSSMap = debug ? {'color':'red'} : {'display':'none'};
$feeds.each(function(i) {
    var $that = $(this);
    $feeds.each(function(j) {
        var $this = $(this);
        if (j <= i) {
            return true;//continue
        };
        if ($this.text() == $that.text()) {
            $this.css(dupliCSSMap);
        }
    });
});