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m00n_byt3 / Whatsapp Web Theme Editor

// ==UserScript==
// @name         Whatsapp Web Theme Editor
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Add Whatsapp Web toggle setting for dark mode.
// @author       m00n_byt3
// @copyright    2020, m00n_byt3 (https://openuserjs.org/users/m00n_byt3)
// @license      MIT
// @match        https://web.whatsapp.com/
// @grant        none
// @require      http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js
// @require      https://gist.github.com/raw/2625891/waitForKeyElements.js
// @grant        GM_addStyle
// ==/UserScript==


//Comment the line below for preloading Whatsapp Web on Default Mode
document.body.className = 'web dark';

waitForKeyElements ("._2sNbV", set);


function set() {

    var div = document.getElementsByClassName("_1CkkN")[1];
    var mod = document.getElementsByClassName("_1CkkN");

    var clone = div.cloneNode(true);
    clone.title = "Theme";

    document.getElementsByClassName("_2sNbV")[0].appendChild(clone);

    if (document.body.className == 'web') {
        document.getElementsByClassName("_3LL06")[4].innerHTML = "Set Dark theme";
        mod[4].setAttribute("onclick","document.body.className = 'web dark';");
    } else {
        document.getElementsByClassName("_3LL06")[4].innerHTML = "Set Default theme";
        mod[4].setAttribute("onclick","document.body.className = 'web';");
    }

}