JSFiddle - React, Tailwind, and code Playground

HTML

<div id="rezult1">&nbsp;</div>
<div id="test1">qqqq</div>
<script>

</script>

SCSS

#test1 {
  display: none;
}

JavaScript

var obj1 = document.getElementById('test1');

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