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Jquery use has traversing to find element

Code:

 <ul>
            <li>Does the UL contain an LI?</li>
        </ul>

Jquery :
 <style type="text/css">
        .full
        {
            border: 1px solid red;
        }
    </style>
    <script>
        $(document).ready(function () {
            $("ul").append("<li>"+($("ul").has("li").length?"YES":"NO")+"</li>");
            $("ul").has("li").addClass("full");
        });
    </script>

Done :)

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