Ahead of the final unveiling of OS X Mavericks at tomorrow's media event and an expected public launch soon after, several high-profile websites including The New York Times and NBA.com have begun supporting the new Safari push notifications feature included with Mavericks, as noted by user Sky Blue in our forums. The feature allows users to subscribe to a websites' notification services and have various types of alerts pushed to their Macs even when Safari is not running. Push notifications in Mavericks may be a handy alternative to RSS or Twitter for many users, delivering clickable notifications directly to the users' desktops in a timely fashion.
