This change generalises the notification bar rendering to allow more complex content to be displayed. Now you must provide the full HTML of the notification message when using `<aio-notification>`. Also you can control whether clicking the content triggers the notification to close or not. This will support the new notification specified in "Other Items : 3" of [#24140](https://github.com/angular/angular/issues/24140#issuecomment-397480410) PR Close #25020