const b = new Blob(['data'], { type: 'text/plain' })
const s = b.slice(0, 2, 'text/html')
s.type // β 'text/html'Pass a MIME type as the third argument to change the type of the sliced Blob.
blob.slice(start) slices from start to the end of the Blob.
new Blob(['hello']).slice(2).size equals 3 ('llo' = 3 bytes).
Challenge: Verify that new Blob(['hello']).slice(2).size === 3.