JSFiddle - React, Tailwind, and code Playground

HTML

<div class="test btn btn-primary">Testimonials>>
    <div class="carousel-quotes">
         <!-- del this to chk -->
    </div>
</div>

JavaScript

var ln=$.trim($('.carousel-quotes').text()); /* trim is important here to remove any white space inside the div */
if (ln.length === 0){
     $('.test').hide();  
}