Now u see the notification from facebook while facebook site isn't open. HOW?
You get notifications because you comment on posts, join groups or follow pages. The less you do of these things, the fewer notifications you'll receive.
Push notifications on Facebook are the alerts you receive when your phone is locked or when you aren't actively browsing Facebook. Think of a Facebook push notification as an alert that pushes through the closed app to make you aware of any Facebook activities that may interest you.
When you've downloaded the Facebook app, we may send you two types of mobile notifications: Push notifications: sent when you're not actively using Facebook (example: on your device's lockscreen). In-app notifications: sent when you're using Facebook.
In the top right, click your Page photo, then click Settings & Privacy. Click Settings, then click Notifications in the left menu. Select which notifications you want to receive on Facebook.
Facebook uses the Push Notifications API: https://www.w3.org/TR/push-api/
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