A simple demonstration of how you can use Firebase's realtime database to create a multiplayer experience on the web.
Open src/index.js and replace https://YOUR-FIREBASE-URL with your own Firebase Database URL.
Run npm run start in the console.
You are represented by the blue dot. Everyone else is a red dot. Every new connection to the site generates a new "player" who is visible to all other current players. Click or tap to move around.