Online HTML5 Hover Demo doesn't work

[mconnew]

https://developer.microsoft.com/en-us/microsoft-edge/testdrive/demos/hover/

The link to View Demo takes you to http://hover.ie which is a domain owned by Microsoft. It points to an ip address which hosts cloudapp.net websites. There is an error page returned stating:

404 Web Site not found.
You may be seeing this error due to one of the reasons listed below :

Custom domain has not been configured inside Azure. See how to map an existing domain to resolve this.
Client cache is still pointing the domain to old IP address. Clear the cache by running the command ipconfig/flushdns.
Checkout App Service Domain FAQ for more questions.