JSFiddle - React, Tailwind, and code Playground

HTML

<div class="something">something</div>

JavaScript

$(document).bind('keydown', function(e) {
    if (e.keyCode == 72) {
        // press the letter H
        $('.something').show()
    } else if (e.keyCode == 74) {
        //press the letter J
        $('.something').hide()
    }
    return false;
});