Inspect every browser-visible mouse event.

Use one capture surface to test movement, standard and side buttons, double-clicks, and wheel direction.

Mouse event bench

Ready

Active buttonNone

Movement events≈0 /sec

Double-clicks0

Last wheel direction: No movement · Total clicks: 0 · Wheel events: 0

Diagnostic result

Ready for a pointer test

Move the pointer inside the surface, click each available button, double-click, and scroll in both directions.

This test requires a mouse or trackpad; touch gestures are not physical mouse-button tests. The movement event rate is browser-observed and not the device's calibrated USB polling rate. Display refresh, power saving, and event coalescing affect it.

Use event patterns to find the failing layer.

The browser reports usable events, not raw USB packets. Compare button, wheel, and motion behavior separately.

Observed signalLikely layerNext check

Double-click count jumpsSwitch bounce or OS timing

Slow the click cadence and compare the operating-system double-click setting.

Side button never appearsBrowser or mouse utility mapping

Check whether vendor software remapped it to a shortcut or gesture.

Motion pausesSurface, wireless link, or load

Clean the sensor, change surface, recharge, and close animation-heavy tabs.