preventDefault Patch

Prevent the cancellation of important shortcut keys in the browser by web pages.

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.

(У мене вже є менеджер скриптів, дайте мені встановити його!)

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        preventDefault Patch
// @namespace   preventdefault-patch.user.js
// @match       *://*/*
// @grant       none
// @version     1.0
// @icon        https://vivaldi.com/wp-content/themes/vivaldicom-theme/img/browsers/vivaldi.webp
// @author      nafumofu
// @description Prevent the cancellation of important shortcut keys in the browser by web pages.
// @license     MIT
// ==/UserScript==

const keys = [
    't',
    'n',
    'w',
    'Tab',
    'PageDown',
    'PageUp',
];

Event.prototype.preventDefault = new Proxy(Event.prototype.preventDefault, {
    apply(target, thisArg, argumentsList) {
        const event = thisArg;
        
        if (event.type === 'keydown') {
            if (keys.includes(event.key) && !event.altKey && event.ctrlKey && !event.metaKey) {
                return;
            }
            
            if (event.key === 'F4' && event.altKey && !event.ctrlKey && !event.shiftKey && !event.metaKey) {
                return;
            }
        }
        return Reflect.apply(target, thisArg, argumentsList);
    }
});