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.
LockedFileobject from which the request was started.
- A callback handler called repeatedly while the operation represented by the
FileRequestis in progress.
FileRequest interface also inherits from the
|FileSystem API||Editor's Draft||Draft proposal.|