Web Notifications defines an HTML5 API for end-user notifications. A notification allows alerting the user outside the context of a web page of an occurrence, such as the delivery of email.
This is an opt-in feature that usually needs to be enabled by the user per site. Common ways to show such notifications is via a system tray (see attached pictures for examples).
Qt does not offer API for showing notifications e.g. in the system tray. But Qt WebEngine should provide API to a) enable/disable notifications per page, and b) notify the application about arriving notifications.
HTML Standard
https://www.w3.org/TR/notifications/
Example
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QTBUG-71517 (Push) Notifications for Qt Applications
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 - Open
 
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        QTBUG-71518
        Messaging (Push Notifications) on platforms without native notification support.
    
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 - Withdrawn
 
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QTBUG-53457 Push messaging
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 - Closed
 
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