How to set the platform in browser url in ionic?

Few months back I have used a command to specify the platform in browser Url to render the html views as in Android and ios. SOmething like> localhost:8100/?ionic-platform=android
But it’s seems to be not working now.Ionic version 3.Any help?

If this used to work and doesn’t any more best create an issue as a bug report:

It was working and I am not sure was it the correct format.Any idea? @Sujan12