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Faith79 / WhatsApp Web Dark Mode

// ==UserScript==
// @namespace   https://openuserjs.org/users/Faith79
// @name        WhatsApp Web Dark Mode
// @description Activates the dark mode in WhatsWeb
// @author      Faith79
// @version     1.4
// @copyright   2019, Faith79
// @license     MIT
// @updateURL   https://openuserjs.org/meta/Faith79/WhatsApp_Web_Dark_Mode.meta.js
// @downloadURL https://openuserjs.org/install/Faith79/WhatsApp_Web_Dark_Mode.user.js
// @match       https://web.whatsapp.com/*
// @grant       none
// ==/UserScript==

(function () {
  var startup = setInterval(run, 1000); 
})();

function run(){
   var id = document.getElementById("startup");
    if(!id){
      document.body.className += " dark";
       clearInterval(startup);
    }
}