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Short answer: yes, on quizzes. The moment your quiz tab loses focus, Canvas writes it to the log — timestamped, for your instructor to see. Here's how the signal works and the only reliable way around it.
Does Canvas track tab switching?
| Signal | Canvas | What that means |
|---|---|---|
| Switching to another browser tabLogged as a “stopped viewing the quiz” event with a timestamp. | Can see | Logged as a “stopped viewing the quiz” event with a timestamp. |
| Switching to another window or appSame as a tab switch — the quiz page losing focus is what's recorded. | Can see | Same as a tab switch — the quiz page losing focus is what's recorded. |
| How long you were awayThe gap between “stopped viewing” and “resumed” is in the log. | Can see | The gap between “stopped viewing” and “resumed” is in the log. |
| Which tab or site you openedCanvas records that you left, never where you went. | Can't see | Canvas records that you left, never where you went. |
| A second phone or laptopAnything off the quiz device is invisible to Canvas. | Can't see | Anything off the quiz device is invisible to Canvas. |
Every browser exposes a Page Visibility API that fires an event the instant a tab is hidden or shown. Canvas listens for it during a Classic Quiz and writes a “Stopped viewing the Canvas quiz-taking page” entry, then a “Resumed” entry when you return. It's the same signal our tab-switch test uses — try it and watch the counter move.
Not a video — a timeline. The quiz log lists each stop and resume with timestamps, alongside when you answered and changed answers. One or two switches are background noise. A timed quiz with a dozen of them, each lining up with a correct answer, is the pattern that gets an attempt reviewed. You can see exactly how it reads in the quiz log simulator.
You can't delete the event after it fires, so the answer is to never create it. That's the whole point of the CheatGPT extension: it reads the question and answers it inside the quiz page, so there is no second tab to switch to and nothing for the log to record.
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