Add web notification to my Stack site?

I was wondering if anyone had added web notification to their RW site and if so what was the best way.
Chris Potter

What sort of notification were you thinking about?

Something like this
I would love a stack to have the ability like on WP
Here is another tool that got me thinking
It would be great to have this for clients

I just noticed this site has a push notification LOL

How did you solve the push notifications?