JSFiddle - React, Tailwind, and code Playground

HTML

<form action="">
  <input type="text" autofocus>
</form>

<button>Foo</button>

<a href="#0">Bar</a>

<div id="focus">Есть фокус!</div>

JavaScript

setInterval(function() {
  $('#focus').toggle(!!$('*:focus').length);
}, 100);