Autofocus on text area

focus.js

// ==UserScript==
// @name         Duolingo Text Area Autofocus
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Salvador Guzman
// @match        https://www.duolingo.com/skill/*
// @icon         https://www.google.com/s2/favicons?domain=duolingo.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    document.getElementByTag('textarea').autofocus = true;
})();