Sending Notifications to JavaScript
===

I have a HTML5/JavaScript web app that interacts with a WCF RESTful Service.

What I need is some way to update the HTML/JS WebApp UI when something changes on the server machine.

I have looked into Windows Notification Services but it seems this only works for Windows 8 Apps and Windwos Phone Notifications.

Is there a standard / well supported way of doing this?

EDIT: To clarify I am looking for a Real Time push service that I can consume via JS.