Install
Install this website as a mobile/desktop application.
Push Notifications
Request permission for and send a push notification to the device.
App Badge
Set the application badge icon.
Background Sync
Set a task to run when connection is stable.
Periodic Background Sync
Set a task to run once a day.
Contact Picker
Read contacts.
File System Access & File Handling
Read from and write to local files. Open files with this application.