Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The reading operation starts at the position given by the
Note: The three interfaces
IDBFileRequest are deprecated and only implemented
for backward compatibility in Firefox. Do not use them anymore:
consider using the File and Directory Entries API instead.
A number representing the number of bytes to read in the file.
This feature is not part of any current specification. It is no longer on track to become a standard.