JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="myTextarea"></textarea>
<div id="showedText"></div>

CSS

#showedText{
    display: none;
}

JavaScript

$(function(){
    $('#myTextarea').on('keyup',function(){
        $('#showedText').text('Just a test!').stop().fadeIn(700, "linear");
    setTimeout(function(){$('#showedText').stop().fadeOut(700, "linear");},2000);
    });
});