Queries for metaverse

Hello all , My name is andreson . I am a full stack developer. I want to create a virtual art gallery for multiple clients in web . As a beginner in unreal i want to confirm some thing before moving on with the project .

  1. Does unity supports multiplayer system on web. If yes , how many clients can i bring without getting any lag
  2. Login Registraion Form
  3. Chat application
  4. Video player
  5. Character selection options , etc

these are the primary things which i require in the project . If you have any suggestions for the topic . Please feel free to share your thoughts …