Chrome Push Notification: This site has been updated in the background

Generally as soon as you receive a push message from GCM (Google Cloud Messaging) you have to show a push notification in the browser. This is mentioned on the 3rd point in here:

https://developers.google.com/web/updates/2015/03/push-notificatons-on-the-open-web#what-are-the-limitations-of-push-messaging-in-chrome-42

So it might happen that somehow you are skipping the push notification though you got a push message from GCM and you are getting a push notification with some default message like “This site has been updated in the background”.

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