JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<li class="item">
    <div class="elementToShow">Shown Element</div>
    <div class="elementsToBeHidden">Hidden Element</div>
</li>
<li class="item">
    <div class="elementToShow">Shown Element</div>
</li>
<li class="item">
    <div class="elementToShow">Shown Element</div>
    <div class="elementsToBeHidden">Hidden Element</div>
</li>

JavaScript

$('.item:has(.elementsToBeHidden)')
    .append('<a class="hiddenElements"> See More </a>')
    .find('a').click(function() {
    $(this).siblings('.elementsToBeHidden')
        .slideToggle('slow');
});