JSFiddle - React, Tailwind, and code Playground

HTML

<div id="target" tabIndex="-1">target</div>

JavaScript

$('#target').on('keydown', function(e) {
    console.log('keydown', e);
    this.innerHTML += '<br />which:' + e.which + ' keyCode:' + e.keyCode;
});

$('#target').trigger(jQuery.Event('keydown', {which: 13}));
$('#target').trigger(jQuery.Event('keydown', {which: 13, keyCode: 13}));