Use the scroll wheel over the test area.
Small delta values can be normal on touchpads and high-resolution wheels. The test flags unexpected short-interval direction changes as a symptom.
Tests mostly run in your browser. Microphone/camera data is not saved on the server.
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How to use and interpret Scroll Wheel Test
What this test checks
Tracks wheel direction, step size and short-interval unexpected direction reversals.
Check wheel direction, step behavior and unexpected reverse-scroll events.
How to interpret the result
Look for missed, repeated or unexpected input events and compare the behavior with another browser or device when possible.
Browser limitations
Browser focus, operating-system shortcuts, accessibility features, wireless interference and device firmware can affect input behavior.
Frequently asked questions
What does Scroll Wheel Test check?
Tracks wheel direction, step size and short-interval unexpected direction reversals.
Does a failed input mean the keyboard or mouse is broken?
Not necessarily. Re-test after checking focus, connection, batteries, another USB port or another browser before treating it as a hardware fault.
What should I do if the result looks bad?
Repeat the test under the same conditions, check the suggested next diagnostic and compare with another browser, connection or device where practical. Use the related guides for step-by-step troubleshooting.