MOUSE
Scroll Wheel Test
Scroll up and down inside the area.
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Mouse / BROWSER TEST
Mouse scroll wheel test
Check whether scrolling events reach the browser in the expected direction. Scroll inside the test area and watch the counters.
How to use this testQUICK START
How to use the scroll wheel
- Place the pointer over the scroll test area.
- Scroll slowly upward, then downward, and check the corresponding counters.
- Repeat with consistent movements if you suspect skipped or reversed scrolling. Reset before comparing devices.
READ YOUR RESULTS
Understanding your results
The counters measure browser wheel events, not physical notches. One wheel notch may produce more than one event, and smooth or inertial scrolling can continue producing events after the initial movement.
The visual indicator shows the direction of vertical scrolling. Trackpads and free-spinning wheels may generate very different event counts. Compare direction and consistency rather than expecting one event per notch.
Frequently asked questions
Why are there more events than wheel notches?
Browsers and operating systems can split or combine scrolling input. Smooth scrolling and inertia also change the number of events delivered.
Does this work with a trackpad?
Yes, trackpad scrolling often generates wheel events. Use the touchpad test if you also want movement and click feedback.