27 June 20139to5Mac:
During the WWDC keynote, Apple introduced a new Safari 7 feature that allows developers to take advantage of native push notifications on their websites. Unlike HTML5 push notifications, which have been used by some browsers for some time now, native push notifications act like any other installed application’s notifications: they are branded for the app rather than the browser, they can be used even when you aren’t on the website, and they can even pop up when Safari isn’t running.
This is a proprietary spec at the moment — it isn’t part of HTML5 — but this is the general process for how the web works. Browser vendors implement new features at a rapid pace and then pressure the standards body to ratify it, as the technologies become adopted in websites.