JSFiddle - React, Tailwind, and code Playground

HTML

<div class="hasTooltip"> 
<textarea>
<html>
  <h1>
  This is test
  </h1>
  <p>
  More HTML ...
  </p>
</html>
</textarea>
</div>

CSS

textarea{
  height:200px;
  width:100%;
  border:none !important;
  background:none;
  resize: none;
}

JavaScript

$('.hasTooltip').click(function() {
    var win = window.open("", "Title", "toolbar=no");
    win.document.body.innerHTML = $("textarea").val();
});