JSFiddle - React, Tailwind, and code Playground

HTML

<textarea maxlength=42></textarea>
<p>It should say 42, 42, undefined here:
<pre>

JavaScript

$(function() {
    $('pre').text(
        $('textarea').prop('maxlength')
        + ';' +
        $('textarea').prop('maxLength')
        + ';' +
        $('textarea')[0].maxlength
    );
});