Notification.lang

The lang read-only property of the Notification interface indicates the language used in the notification, as specified in the lang option of the Notification() constructor.

The language itself is specified using a DOMString representing a language tag according to RFC 5646: Tags for Identifying Languages (also known as BCP 47). See the Sitepoint ISO 2 letter language codes page for a simple reference.

A DOMString specifying the language tag.

The following snippet fires a notification; a simple options object is created, then the notification is fired using the Notification() constructor.

var options = {
  body: 'Do you like my body?',
  lang: 'en-US'
}

var n = new Notification('Test notification',options);

console.log(n.lang) // should return 'en-US'

• Using the Notifications API