The VRDisplay interface of the WebVR API represents any VR device supported by this API. It includes generic information such as device IDs and descriptions, as well as methods for starting to present a VR scene, retrieving eye parameters and display capabilities, and other important functionality.
The FileSystemEntry interface of the File and Directory Entries API represents a single in a file system. The entry can be a file or a directory (directories are represented by the DirectoryEntry interface. It includes methods for working with files—including copying, moving, removing, and reading files—as well as information about a file it points to—including the file name and its path from the root to the entry.
The FileSystemFileEntry interface of the File System API represents a file in a file system. It offers properties describing the file's attributes, as well as methods for creating a FileWriter object to write to the file or a File object to read the file.