A few weeks ago I discovered that the CSS 1.0 spec (1996) uses a VR scene as an example of an environment in which to apply the rules. It was certainly in the tech zeitgeist back then!
No, just a comment in the spec: "Note that an application may reinterpret an explicit size, depending on the context. E.g., inside a VR scene a font may get a different size because of perspective distortion."