Mouse Scroll Wheel Test
Start, then click, scroll or drag inside the test area. Counts include only events received there. For speed tests choose the duration first.
Results
Start →
How to use this tool
Start, then click, scroll or drag inside the test area. Counts include only events received there. For speed tests choose the duration first.
| Results | Method and units |
|---|---|
| Wheel events | deltaX / deltaY |
| Mapping | deltaMode: 0 = px, 1 = line, 2 = page |
Example
Wheel events: 1 · Recent events: Δy = +120, deltaMode = 0 → 120 CSS px ↓
What this test can and cannot tell you
Results reflect events and signals available to your browser. Settings, permissions and device support can affect them; they do not certify that hardware is healthy or faulty.