JSFiddle - React, Tailwind, and code Playground

HTML

<b>red</b>
<i>italic</i>
<b>red</b>

<p id="p"></p>

<textarea id="text">
  <b>red</b>
</textarea>
<input id="cmd" value="add" type="button">

CSS

.red {color: red}
textarea {width:100%;height:50px}

JavaScript

$(document).ready(function(){
  $("#cmd").on("click", function() {
    $("#p").html($("#text").val());
  });
  $("b").each(function() { 
    $(this).addClass("red");
  });
});