JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="child">
     test
  </div>
</div>
<div class="parent">
  <div class="child"></div>
</div>

CSS

.child {
  border:1px solid #000;
}
.parent .child:empty {
  border:none;
  display:none;
}