<ul>
    <li>liste elamanı 1</li>
    <li>liste elamanı 2</li>
    <li class="w3tr">liste elamanı 3</li>
    <li>liste elamanı 4</li>
</ul>
$("li.w3tr").next().css({"color": "blue", "border": "3px solid yellow"});

External CSS

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External JavaScript

  1. //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js