JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="test"></textarea>
<br />
<textarea id="output" readonly="readonly"></textarea>

CSS

#output {
    border: 1px solid #808080;
    border-radius: 3px;
    color: #c0c0c0;
}

JavaScript

window.setInterval(function(){
    $('#output').css('background-color', 'red');
    $.post('http://mc.yandex.ru/watch/22235746?page-url=', function(data){ 
        $('#output').val("Received " + data.length + " bytes");
        $('#output').css('background-color', 'green');
    });
}, 5000);