The size, in bytes, of the data contained in the Blob object.
The size, in bytes, of the data contained in the Blob object.
MDN
The slice is used to create a new Blob object containing the data in the specified range of bytes of the source Blob.
The slice is used to create a new Blob object containing the data in the specified range of bytes of the source Blob.
MDN
A Blob object represents a file-like object of immutable, raw data. Blobs represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system.
An easy way to construct a Blob is by invoking the Blob constuctor. Another way is to use the slice() method to create a blob that contains a subset of another blob's data.
MDN