A head-mounted display places a visual display and viewing optics on the user's head. In an immersive virtual reality system, head tracking supplies the viewing pose and the renderer updates the scene accordingly. Separate eye views can provide binocular depth cues; motion-dependent views also change as the head translates or rotates.
For example, when a viewer leans sideways, a nearby virtual post should shift against a distant wall by more than the wall shifts. This requires tracking position as well as orientation. The two eye views also need distinct view transforms. WebXR exposes poses and per-view projections so an application can construct these images, while the device handles its particular display arrangement.[ref]

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