JSFiddle - React, Tailwind, and code Playground

HTML

Test Text<input type="text" value="" class="dis" id="someId"/>

<input type="button" value="click" onclick="test()"/>

CSS

.dis{
    display:block;
}

JavaScript

function test(){
   var display =  document.getElementById('someId').style.display;
    
   if(display=='block')
    { 
      alert('display is '+display);
    }
}