​

document.addEventListener("keypress", function(e) {

  // Update "out" div when keypress happen on document.

  document.getElementById('out').textContent = e.keyCode;

});

​

document.getElementById('in').addEventListener("keypress", function(e) {

  // Update "out" div when keypress happen on input.

  document.getElementById('out').textContent = e.keyCode;

});