The notifications are allowed to be full webpages - which can then communicate back to the parent window. (or extension)
This will be a reasonable alternative to modal dialogs for chrome extensions initially, and eventually for web apps in general. (if it gets adopted by other browsers)
This works only in chrome, your web-app can also do this, but the user will have to authorize your web-apps use of this. I wrote a small chrome reminder extension which used these notifications => https://github.com/minhajuddin/quickr . That should show you how to create a notification from your app.
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[ 3.1 ms ] story [ 28.3 ms ] threadhttp://gmailblog.blogspot.com/2011/01/new-in-labs-unread-mes...
This will be a reasonable alternative to modal dialogs for chrome extensions initially, and eventually for web apps in general. (if it gets adopted by other browsers)
http://www.html5rocks.com/tutorials/notifications/quick/
ex: https://chrome.google.com/extensions/detail/phokmbaffndjgejh...