webxr-ios/docs/app/polyfill/display

Name	Description	Size
FlatDisplay.js	FlatDisplay takes over a handset's full screen and presents a moving view into a Reality, as if it were a magic window. If ARKit is present, it uses the ARKit updates to set the headModel pose. If ARCore is available on the VRDisplays, use that to pose the headModel. (TODO) Otherwise, use orientation events.	5939
HeadMountedDisplay.js	HeadMountedDisplay wraps a WebVR 1.1 display, like a Vive, Rift, or Daydream.	3841