JSFiddle - React, Tailwind, and code Playground

HTML

<div id="rezult1">&nbsp;</div>
<div id="test1" style="display: none;">&nbsp;</div>

JavaScript

var obj1 = document.getElementById('test1');
if (obj1.style.display == 'none') {
document.getElementById('rezult1').innerHTML = "Скрыто";
}