JSFiddle - React, Tailwind, and code Playground
by doug65536
HTML
<div id="foo">
<div class="countme">Content</div>
<div class="countme">Content</div>
<div class="countme">Content</div>
<div class="countme">Content</div>
<div class="countme">Content</div>
<div class="countme">Content</div>
</div>
<div id="bar">
<div class="countme">Content</div>
<div class="countme">Content</div>
</div>
JavaScript
$('body').append($('<p/>').text($('#foo .countme').length));
$('body').append($('<p/>').text($('#bar .countme').length));