JSFiddle - React, Tailwind, and code Playground

by cssGuy

HTML

<div><!-- --></div>
<div> </div>

CSS

/* BEHAVIOR OF EMPTY PSEUDO-CLASS SELECTOR */
/* COMMENTS, PROCESSING INSTRUCTIONS MUST NOT AFFECT WHETHER AN ELEMENT IS CONSIDERED EMPTY OR NOT */

div:empty {
    width: 50px;
    height: 50px;
    background-color: red;
}