← The Background Task That Waited 40 Seconds for 'Idle'Quiz
requestIdleCallback: how idle is 'idle'?
Ten questions on what requestIdleCallback actually schedules, why it can stall indefinitely, what the timeout option really trades away, and when to reach for something else entirely.
questions10
pass mark70%
resultsat the end
No account needed. Answer all 10 questions, then see your score with every answer explained and a reference to the spec or MDN — pass and you can claim a certificate.