Last week, alongside many great questions, one especially interesting ask on managing multiplayer projects came to us from a high school teacher. Specifically, how to deploy a completed multiplayer project to WebGL. To support cross-platform gaming for multiplayer titles on any device, we’ve introduced full support of WebGL for Relay as part of our multiplayer solutions. You can now peer-host browser clients on any device with any other platform, such as consoles and mobile. This means that you can create more flexible and accessible multiplayer games that can reach a wider audience.
For those not using Relay, there is a Netcode for GameObjects workaround if using the latest version of Unity (2022.2): Request the version 2X experimental from the Package Manager, then follow these steps.
Source: Unity Technologies Blog