The icon read-only property of the Notification interface contains the URL of an icon to be displayed as part of the notification, as specified in the icon option of the Notification() constructor.

A string.

In our To-do list app (view the app running live), we use the Notification() constructor to fire a notification, passing it arguments to specify the body, icon and title we want.

const notification = new Notification("To do list", {
  body: text,
  icon: img,
});

• Using the Notifications API