Processes that occur in web applications are asynchronous, and as time passes, they generate event messages to alert end users about the start, end, or progress of the process execution. The web notification API allows you to display notifications outside the context of web pages. The user agent determines the optimum presentation of the notification. This aspect depends on the device on which it is running. Usually, it can present notifications in the following areas:
At a corner of the display
In an area within the user agent
On the home screen of a mobile device
The web notification API, available as part of the dart:html package, allows you to send information to a user even if the application is idle. Notifications can be useful in the following use cases:
To notify users about new incoming messages
To notify users about special events in game applications
To notify users about the connection status of an application, the battery status of a device, and so on