Notificação do Chrome

var notification = webkitNotifications.createNotification(
'icon.png',
'title',
'text"
);

notification.show();

//cancel it after 5 seconds.

setTimeout(function(){

notification.cancel();

},5000);

Em manifest.json:

"permissions": [
"notifications"
],
"web_accessible_resources": [
"icon.png"
]