World: Main scene script to coordinate the work of the systems. Can be initialized by code to allow testing.System: Used to split the World logic. They can be tested in an isolated context.Object: Defines a GameObject's main class as we can't extend GameObject.Interfaces: are used to have a clear difference between what should only be managed by the World/System from what can be accessed from any place.
Link: https://github.com/greggman/better-unity-webgl-template
Reason: Allow the game to fully expand to the available screen-space.