To see in action. Follow the steps :
- Click on subscribe button. On the bottom right of the page.
- You will be asked to allow / block notification. Click on "allow".
- You would now see a bell icon replacing the "subscribe" button
- Now click the bell icon.
- A popover would appear with the subscription object. Copy it all.
- Open this link
- Paste in the "Subscription to Send To" section
- Type in your message you want
- Now click "Send message" and see a popup should come.