JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output"></div>

JavaScript

function getMessage(c_name) {
    if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end == -1) {
                c_end = document.cookie.length;
            }
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return "";
}
function check() {
    var message = getMessage('test');
    var element = document.getElementById('output');
    element.innerHTML = message;
}
window.setInterval(check, 1000);