Notification.silent
Note: This feature is available in Web Workers
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
  The silent read-only property of the
  Notification interface specifies whether the notification should be
  silent, i.e., no sounds or vibrations should be issued, regardless of the device
  settings. This is specified in the silent option of the
  Notification() constructor.
Value
  A boolean value. false is the default; true makes
  the notification silent.
Examples
  The following snippet is intended to fire a silent notification; a simple
  options object is created, and then the notification is fired using the
  Notification() constructor.
var options = {
  body: 'Do you like my body?',
  silent: true
}
var n = new Notification('Test notification', options);
console.log(n.silent) // should log true
Specifications
| Specification | 
|---|
| Notifications API Standard # dom-notification-silent | 
Browser compatibility
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