JSFiddle - React, Tailwind, and code Playground

HTML

<textarea class="speechttxt"  ></textarea>

<div class="SpeechBubble" id="speechID" data-bind="attr: { class: 'SpeechBubble' }">
    <div class="pointer bottom " id="pointer"></div>
    <div class="txtspeech"></div>
</div>

JavaScript

$('.speechttxt').keyup(function () {
    var txt = $(this).val();
    $('.txtspeech').html(txt);
});