JSFiddle - React, Tailwind, and code Playground

HTML

<div class="div-class">
        <ul>
            <li class="li-class">
                <span itemprop="something">
                    <h3>Some title</h3>
                </span>
            </li>
            <li class="li-class">
                <span itemprop="something">
                    <p>
                    Not a header
                    </p>
                </span>
            </li>
                        <li class="li-class">
                <span itemprop="something">
                    <h3>
                    Another Header
                    </h3>
                </span>
            </li>
        </ul>
    </div>

CSS

.yellow{
  background-color:yellow;
}

JavaScript

$("li").has( "h3" ).addClass( "yellow" );