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.
IDBMutableFile interface provides access in read or write mode to a file, dealing with all the necessary locks.
Note: This interface used to be called
FileHandle , but it was changed to this (bug 1006485.)
IDBMutableFile objects are bound to a fake file system built on top of IndexedDB, such an object is created using the
Not part of any specification at present.