--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser_side/notification.py	Sat Feb 23 16:27:32 2013 +0100
@@ -0,0 +1,45 @@
+from __pyjamas__ import JS
+
+
+class Notification(object):
+    """
+    If the browser supports it, the user allowed it to and the tab is in the
+    background, send desktop notifications on messages.
+
+    Requires both Web Notifications and Page Visibility API.
+    """
+
+    def __init__(self):
+        JS("""
+        this.enabled = false;
+
+        if (!('hidden' in document))
+            document.hidden = false;
+
+        if (!('Notification' in window))
+            return;
+
+        if (Notification.permission === 'granted')
+            this.enabled = true;
+
+        else if (Notification.permission === 'default') {
+            Notification.requestPermission(function(permission){
+                if (permission !== 'granted')
+                    return;
+
+                this.enabled = true;
+            });
+        }
+        """)
+
+    def notify(self, title, body, icon='/media/icons/apps/48/sat.png'):
+        JS("""
+        if (this.enabled && document.hidden) {
+            notification = Notification(title, {body: body, icon: icon});
+
+            // Probably won’t work, but it doesn’t hurt to try.
+            notification.addEventListener('click', function() {
+                window.focus();
+            });
+        }
+        """)

--- a/libervia.py	Tue Jan 07 23:49:39 2014 +0100
+++ b/libervia.py	Sat Feb 23 16:27:32 2013 +0100
@@ -35,6 +35,7 @@
 from browser_side.jid import JID
 from browser_side.xmlui import XMLUI
 from browser_side.tools import html_sanitize
+from browser_side.notification import Notification
 
 from sat_frontends.tools.misc import InputHistory
 from sat_frontends.tools.strings import getURLParams
@@ -180,6 +181,7 @@
         self.avatars_cache = {}  # keep track of jid's avatar hash (key=jid, value=file)
         self._register_box = None
         RootPanel().add(self.panel)
+        self.notification = Notification()
         DOM.addEventPreview(self)
         self._register = RegisterCall()
         self._register.call('registerParams', None)
@@ -305,6 +307,9 @@
             panel = self.tab_panel.tabBar.getTabWidget(tab_index)
         panel.addWidget(wid)
 
+    def displayNotification(self, title, body):
+        self.notification.notify(title, body)
+
     def _isRegisteredCB(self, registered):
         if not registered:
             self._register_box = RegisterBox(self.logged)
@@ -648,10 +653,11 @@
         _to = JID(to_jid)
         other = _to if _from.bare == self.whoami.bare else _from
         lib_wid = self.getLiberviaWidget(panels.ChatPanel, other, ignoreOtherTabs=False)
+        self.displayNotification(_from, msg)
         if lib_wid is not None:
             lib_wid.printMessage(_from, msg, extra)
         else:
-            # The message has not been showed, we must indicate it
+            # The message has not been shown, we must indicate it
             self.contact_panel.setContactMessageWaiting(other.bare, True)
 
     def _presenceUpdateCb(self, entity, show, priority, statuses):