I am Web developer, and I needs multiple screen layout things, it's obvious that all the web browser supports debugging, inspection, and responsive mode, and it's enough for web frontend developer, but currently I notice that CSS is not working in safari, as it working in Google Chrome, because earlier both works parallel and similar. I tried using clear cache and history, which works earlier, but this time not.

I want to participate in this challenge , it's my first time of attempt , so I don't know what to do in it , I mean on MacOS/iOS/iPadOS , what I have to create , a app , or playgrounds ? And what kind of things I can create , games , productive app ? Kindly tell me all the things broadly about this .