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.
Note: When an ongoing operation is canceled, there is no rollback (it is not a database transaction), therefore the file can be corrupted if the canceled operation was performing some writing.
var request = instanceOfLockedFile.abort();
FileRequest object to handle the success or failure of the operation.
|FileSystem API||Editor's Draft||Draft proposal|