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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.
getFile method allows to retrieve a read-only snapshot of the handled file in the form of a
var request = instanceOfFileHandle.getFile();
|FileSystem API||Editor's Draft||Draft proposal|