Allow The Push Message Notification Message By The Browser. Then Copy and Paste Id you obtained in text box by visiting same url in
another browser after you close this TAB not this browser. The Push Notification will not work if you are in same Tab of this domain that is why you need to open another browser.
You Can Allow the Push Notification Message Freely Since I am not storing any of Your client ID in this demo APP.
You Client ID Will Be Listed Below