Tests
Mouse Scroll Wheel Test
Check up, down and horizontal scrolling, and look for unusual jumps.
Private by designProcessing happens locally in this browser. Device streams and raw readings are not uploaded.
What this test checks
How to use this test
Scroll inside the area. Try both vertical directions and horizontal scrolling if your device supports it.
What the results mean
Direction counts refer to browser wheel events, not physical wheel notches. Large deltas are flagged relative to recent values in the same delta mode.
Troubleshooting
Try another surface, port, connection mode, browser, or operating-system pointer setting.
Browser limitation
Trackpad acceleration, smooth scrolling and line/page units can cause large deltas. A flagged jump is not proof of a faulty wheel. Compare slow, steady scrolling.