JSFiddle - React, Tailwind, and code Playground

HTML

<div id="t">клинки в меня и потом нажми на кнопку на клаве</div>

<script>
function getChar(e) {
  e = e || window.event;
  var key = e.keyCode || e.which;

  document.getElementById('t').innerHTML = String.fromCharCode(key);
}

document.onkeydown = function(e) {
  getChar(e);
}
</script>