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W3C Working Draft
Allows for synchronous reading of File or Blob objects. Only available in Workers, as synchronous I/O would otherwise block the main application from executing.
Important: The FileReaderSync object's read methods (readAsText, readAsDataURL, and readAsArrayBuffer) have the same method signatures as the read methods of the FileReader object but they behave synchronously (as opposed to asynchronously).
|W3C File API Specification||W3C Working Draft|
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Portions of this content come from the Microsoft Developer Network: Windows Internet Explorer API reference Article