User Activity Monitoring

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Send a test CSP violation report and see the ReportingObserver in action. Understand how monitoring works.

Developer Tools CSP demo monitor Reporting API

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See a live readout of window scrollX and scrollY. Visualize scroll direction. For debugging sticky navs.

Debugging live monitor position scroll

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Enter a URL and click to check if it's reachable from your browser (CORS-limited, uses no-cors fetch). Quick manual test. Local only.

Developer Tools check monitor uptime website

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Watch for updates to aria‑live regions and log what a screen reader would announce. Debug live regions.

Accessibility announcement ARIA live region monitor

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Select any element on the test page and monitor its size changes with ResizeObserver. See log of all entries.

Debugging debug monitor ResizeObserver size

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Connect a MIDI controller and see every message in a log. Filter by channel and type. Essential for debugging music apps.

Developer Tools messages MIDI monitor Web MIDI

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Request permission and detect when the user is idle (away from keyboard). See screen lock state. For native‑like apps.

API API Idle Detection monitor user

Tag: User Activity Monitoring