Add the link of "Advanced search" to the GitHub header

try to take over the world!

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Add the link of "Advanced search" to the GitHub header
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  try to take over the world!
// @author       9sako6
// @match        https://github.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    let navElem = document.querySelector("body > div.position-relative.js-header-wrapper > header > div.Header-item.Header-item--full > nav");
    console.log(navElem);
    navElem.insertAdjacentHTML('beforeend', `<a class="js-selected-navigation-item Header-link py-lg-3 d-inline-block" href="/search/advanced">Advanced search</a>`);
})();