Returns a Blob whose data is backed by the given file.
The file must not be modified after the Blob is created. Any modifications
will cause reading the Blob data to fail with a DOMException error.
Synchronous stat operations on the file when the Blob is created, and before
each read in order to detect whether the file data has been modified on disk.
Returns a
Blobwhose data is backed by the given file.The file must not be modified after the
Blobis created. Any modifications will cause reading theBlobdata to fail with aDOMExceptionerror. Synchronous stat operations on the file when theBlobis created, and before each read in order to detect whether the file data has been modified on disk.