Short answer: Canvas does not see the other tab, but it can log that the quiz page lost focus. To hide tab switching, you need to block the focus-loss event itself.
| Method | Hides tab switching? | Why |
|---|---|---|
| Incognito | No | Focus events still fire |
| Clearing history | No | Canvas logs are already server-side |
| Staying on the quiz tab | Yes | No focus-loss event occurs |
| Privacy Guard | Yes for Canvas quiz logs | Blocks the focus/visibility events Canvas listens for |
See the event live in the Canvas Tracking Test, then preview the teacher-side log with the Professor View Simulator.