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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.
active property allows to know if the
LockedFile object is still usable (
true) or not (
false). If the object is inactive then it is impossible to perform any read or write operation with it. Typically, a
LockedFile object becomes inactive when the
LockedFile.abort() method is called or if an error occurs.
var state = instanceOfLockedFile.active
|FileSystem API||Editor's Draft||Draft Proposal.|