JSFiddle - React, Tailwind, and code Playground

HTML

1. Focus input field<br>
2. Press AltGr<br>
<input type="text" id="blah">
<p id="info">
</p>

JavaScript

var i = document.getElementById('blah');
i.addEventListener('blur', function () {
    document.getElementById('info').innerHTML += "blurred. "
})