SO - 21486296

by Arun P Johny

HTML

<ul id="lxx" class="lst">
    <li>arnold</li>
    <li>Becky</li>
    <li>Arnold</li>
    <li>KathY</li>
    <li>Carol</li>
    <li>ARNold</li>
    <li>carol</li>
</ul>

CSS

.someClass {
    color: red;
}

JavaScript

var texts = {};
$('#lxx li').filter(function () {
    var text = $.trim($(this).text().toLowerCase());
    if (texts[text]) {
        return true;
    }
    texts[text] = this;
    return false;
}).addClass('someClass');