const b = new Blob(['Hello World'])
const part = b.slice(0, 5)
await part.text() // β 'Hello'slice() returns a new Blob containing a portion of the original Blob's data.
blob.slice(start, end) returns a new Blob containing bytes from start (inclusive) to end (exclusive).
Challenge: Verify that new Blob(['hello']).slice(0, 3).size === 3.