Compatibility shim for chrome's desktop notification API, and lines to turn on notifications in Steam's web chat after they have been disabled following a page load

html_notification_patch.js

/*
 * Patch in support for Google's draft webkit version of HTML notifications
 * It seems that firefox doesn't currently support the iconUrl option.
 * see the official spec at: http://www.w3.org/TR/2012/WD-notifications-20120614/#api
 * and google's spec at: http://www.chromium.org/developers/design-documents/desktop-notifications/api-specification
 */

window.webkitNotifications = {
    requestPermission: function(callback){
        Notification.requestPermission(callback);
    },
    checkPermission: function(){
        if (Notification.permission === "granted") return 0;
        if (Notification.permission === "default") return 1;
        return 2;
    },
    createNotification: function(img, title, message) {
        var n = new Notification(title, {body: message, iconUrl: img});
        n.show = n.close = function(){};
        return n;
    },
    createHTMLNotification: function() {
        if (window.console && window.console.warn) {
            console.warn("Attempted use of deprecated HTML notification");
        }
        return false;
    }
};

// enable notifications in Steam web chat (steamcommunity.com/chat) after the page has already disabled them
Chat.m_bBrowserSupportsNotifications = true;
Chat.SetPref('notifications', true);