JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
  <input type="button" class="btn" value="a"/>
  <input type="button" class="btn" value="b"/>
  <input type="button" class="btn" value="c"/>
  <input type="button" class="btn" value="d"/>
</div>

JavaScript

document.getElementById('container').onclick = function(event) {
  if (event.target.tagName === 'INPUT' && event.target.type === 'button') {
  	console.log(event.target.value);
  }
}