Allows to set up application initialization parameters, including some WebGL context creation parameters.
"compressed assets" - makes the app load a compressed scene in .xz format instead of a regular .gltf file (see the Asset compression section for more info)
"default fullscreen button" - enables the default fullscreen button to show up in the top right corner
"transparent background" - makes the background transparent so that the underlying parts of a web page become visible through the WebGL canvas
"enable screenshots" - sets the preserveDrawingBuffer property of the WebGL context to true, making it possible to properly capture screenshots from the WebGL canvas
"fade annotations" - makes annotations fade when they are blocked by scene objects
