The File interface provides information about files and allows
in a web page to access their content.

The FileReader object lets web applications asynchronously read
contents of files (or raw data buffers) stored on the user's
using `file.File` or `web.Blob` objects to specify the file or
to read.

FileReader Events.

The FileRequest interface extends the `dom.DOMRequest` interface
provide some extra properties necessary for the `web.LockedFile`

The File and Directory Entries API interface FileSystem is used
represent a file system. These objects can be obtained from the
property on any file system entry. Some browsers offer additional
to create and manage file systems, such as Chrome's `web.requestFileSystem()`

The FileSystemDirectoryEntry interface of the File and Directory
API represents a directory in a file system. It provides methods
make it possible to access and manipulate the files in a directory,
well as to access the entries within the directory.

The FileSystemDirectoryReader interface of the File and Directory
API lets you access the `file.FileEntry`-based objects (generally
or `file.FileSystemDirectoryEntry`) representing each entry in
directory.

The FileSystemEntry interface of the File and Directory Entries
represents a single in a file system. The entry can be a file
a directory (directories are represented by the `web.DirectoryEntry`
It includes methods for working with files—including copying,
removing, and reading files—as well as information about a file
points to—including the file name and its path from the root
the entry.

The FileSystemFileEntry interface of the File System API represents
file in a file system. It offers properties describing the file's
as well as the `web.file()` method, which creates a `file.File`
that can be used to read the file.

The FileSystemFlags dictionary defines a set of values which
used when specifying option flags when calling certain methods
the File and Directory Entries API. Methods which accept an options
of this type may specify zero or more of these flags as fields
an object, like this: