clearAppBadge() method of the
Navigator interface clears a badge on the current app's icon by setting it to
nothing. The value
nothing indictes that no badge is currently set, and the status of the badge is cleared.
let promise = Navigator.clearAppBadge();
Navigatordoes not have a document that this action can be acted on.
Once all messages in an application have been read, call
clearAppBadge() to clear the badge and remove the notification.
The definition of 'clearAppBadge' in that specification.
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