Toggle dark mode

darkmode_userscript.js

// ==UserScript==
// @name         Night mode
// @version      0.0.1
// @description  Toggle night mode by typing ALT + N
// @match        *://*/*
// @source       https://gist.github.com/jeansordes
// ==/UserScript==

function nightmode() {
    'use strict';

    const d = document;
    let t = 'nightstyle-549ad_p', s = 'stylish-1', _ = '#';
    try {
        d.querySelectorAll('iframe').forEach(i => i.contentWindow.document.querySelector(_ + s)?.remove());
    } catch(e) { console.log(e); }
    if (d.querySelector(_ + s)) {
        d.querySelector(_ + s).remove();
    }
    if (d.querySelector(_ + t)) {
        d.querySelector(_ + t).parentElement.remove();
    } else {
        d.head.appendChild(d.createElement('div')).innerHTML = '<style id="' + t + '">html{filter: invert(0.9) hue-rotate(180deg)}img,video,[style*="background-image: url("]{filter: invert(1) hue-rotate(180deg) brightness(1.2)}body {background: white}</style>';
    };
}

document.addEventListener("keydown",evt => {
    // if((evt.altKey && evt.key.toLowerCase() == 'n') || evt.key.toLowerCase() == 'altgraph') {
    if((evt.altKey && evt.key.toLowerCase() == 'n')) {
        nightmode();
    }
});