JSFiddle - React, Tailwind, and code Playground

HTML

<h1>
  Click here to get focus, then press a key
</h1>

JavaScript

function keydownScreenHandler_1(event) {
  alert('- 1 -');
}
//Register the keydown event handler:
document.onkeydown=keydownScreenHandler_1;
    
    
function keydownScreenHandler_2(event) {
  alert('- 2 -');
}
//Register the keydown event handler:
document.onkeydown=keydownScreenHandler_2;