Keyboard & rollover test
See received key events, releases, repeats and simultaneous key combinations.
Diagnostic visuals retain their original colors and remain visible. Presentation filters and high contrast apply outside this workspace; device-level filters may still affect your observation.
Focus the test area, press each physical key, then hold combinations. Tab and Escape remain navigation keys.
Enable JavaScript to run this interactive test. The guide and methodology below remain available.
How to run this check
Focus the test area, press each physical key, then hold combinations. Tab and Escape remain navigation keys.
Understand the result
PASS describes a received signal or your recorded observation. WARNING calls for another check. USER REVIEW REQUIRED means a measurement alone cannot decide. An unavailable API or denied permission does not establish hardware failure.
What this cannot tell you
Browsers reserve some shortcuts and cannot inspect the keyboard electrical matrix. Repetition while held is normal.
If something seems wrong
Compare missing keys in another app. Check layout settings and try another connection.
Understanding browser permissions →Good to know
Is anything uploaded?
Raw diagnostic input and media are processed locally. Standalone results remain in page memory. Guided checks offer optional coarse session recovery for 24 hours; it excludes media and detailed measurements. Hosting and Google Analytics requests still leave your browser. Analytics receives only broad test-usage categories, never these diagnostic contents. See the privacy policy.
Does a pass guarantee my hardware is healthy?
No. It records behavior observed in this browser session. Intermittent faults, internal components and operating-system restrictions need further investigation. See our methodology.
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