JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="textArea"><span style="color: blue">Test</span></textarea><br />

Show textarea here: <span id="show"></span>

JavaScript

var textWOHTML = $("textarea").val().replace(/<(.|\n)*?>/, '').replace(/<\/(.|\n)*?>/, '');
var textWithHTML = $("textarea").val();
$('#textArea').val(textWOHTML);
$("#show").html(textWithHTML);