What can you achieve with the HTML5 File API?

Question

Options

• ADirectly read the contents of files stored on the user's computer.
• BIncrease the storage capacity of the server.
• CTrack the user's browsing history.
• DStream live audio and video.

• A
  92% (24)
• C
  4% (1)
• D
  4% (1)

Explanation

Option A is correct because the HTML5 File API gives JavaScript in the browser controlled access to files that a user explicitly selects (via an <input type="file"> or drag-and-drop), allowing your code to read their contents using the FileReader object - without needing a server round-trip. Option B is wrong because the File API is entirely client-side and has no effect on server storage capacity. Option C is wrong because browsing history is managed by the browser itself and is deliberately off-limits to web pages for privacy reasons. Option D is wrong because live audio/video streaming is handled by separate APIs (MediaStream/WebRTC and the <video>/<audio> elements), not the File API.

Memory tip: Think of the File API as a "controlled file picker" - the user hands the browser a file, and JavaScript can then read it. The key word in the name is File - it reads files, nothing more.

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