JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  Набери 15 символов, потом зажми BackSpace и не отпускай до конца.
  <br>
  <input id="inputField">
</body>
</html>

JavaScript

var inputField = document.getElementById('inputField');

inputField.onkeydown = function() {
  console.log('onkeydown');
};

inputField.oninput = function() {
  console.log('oninput');
};