Apple has asked developers to prepare for Safari Push Notifications, a new feature included in OS X Mavericks, according to Cult of Mac.
Safari Push Notifications allow websites to send push notifications to website users even when Safari is not running.
OS X Mavericks introduces a powerful new way to keep users engaged with your website. You can now use the Apple Push Notifications Service to send notifications to your website users, right on their Mac desktop — even when Safari isn’t running. Safari Push Notifications work just like push notifications for apps. They display your website icon and notification text, which users can click to go right to your website.
Mavericks also adds new interactivity to push notifications, allowing users to perform tasks like replying to an iMessage, or deleting an email, right from the notification. OS X Mavericks is expected to be released later this fall.