DomFile models a DOM File object.
Return file name extension (everything after the last dot) or
nullname has no dot.
Name of file. This is just the file name, and does not include any path information.
Asynchronously load file contents as a
data:URI representing the file's contents.
Asynchronously load file contents as text and invoke the callback function with results.
Size of file in bytes.
MIME type of the file as a read-only string or "" if the type could not be determined.