JSFiddle - React, Tailwind, and code Playground

HTML

<textarea maxLength="10">
</textarea>
<div>
</div>

JavaScript

$textarea = $("textarea");
$div = $("div");

$textarea.keyup(function () {
  $div.text("Remaining characters: " + (parseInt($textarea.attr("maxlength"), 10) - $textarea.val().length));
})