notificationCreates a notification.
It accepts conent of the notification as a first argument,
which can be either text or DOM node. The object produced by the function
has methods show and close that change visibility
of the notification. Initially notification is hidden, and you need to call
its show method to display the notification
The second argument is an object with notification options:
title: title of the notification.dismissible: boolean, whether notification can be closed by user.style: changes the color of the notification.