Many updated Eaglercraft clients feature advanced BungeeCord or ViaVersion setups, allowing browser players to connect to specialized multiplayer servers running modern backend software. How to Access and Play Eaglercraft 1.20

by NotAFanMinecraft

When you open the HTML file, you should see a title screen that explicitly says in the bottom left corner. If it says 1.8 or 1.5, you have the wrong version.