JSFiddle - React, Tailwind, and code Playground

HTML

<p>give me focus</p>

JavaScript

$(window).keypress(function(event) {
    switch (event.keyCode) {

    case 37:
        document.body.innerHTML = 'left arrow';
        break;
    case 39:
        document.body.innerHTML = 'right arrow';
        break;

    }
});