04 Input test
Mouse tester
Click every button, roll the wheel and wave the mouse around inside the pad. It shows which buttons work, flags clicks that double up and estimates how often the mouse reports.
Test pad
Click, right-click, scroll and move inside this box. The right-click menu, middle-click scrolling and the back and forward buttons are caught here so you stay on the page.
| Button | Clicks | Last gap | Shortest | Too fast |
|---|---|---|---|---|
| Left | 0 | – | – | 0 |
| Middle | 0 | – | – | 0 |
| Right | 0 | – | – | 0 |
| Back (4) | 0 | – | – | 0 |
| Forward (5) | 0 | – | – | 0 |
- System double-clicks
- 0
- Wheel up / down
- 0 / 0
- Tilt left / right
- 0 / 0
- Last wheel delta
- –
- Quick reversals
- 0
- Polling now
- –
- Polling peak
- –
- Coalesced events
- –
How to use it
Click each button inside the pad a few times; each part of the drawing lights up while held. A normal double-click shows a gap of roughly 100–250 ms. A click flagged as too fast arrived within the threshold of the previous click on the same button, which usually means a worn switch turned one press into two. Roll the wheel one notch at a time: every notch should count once, in the right direction. A quick reversal is a step the wrong way within 120 ms, the usual sign of a dirty wheel sensor.
Reading the polling rate
Move the mouse in fast circles over the pad for a couple of seconds. The estimate uses the median gap between movement events, so the odd slow event does not drag it down. Where the browser offers coalesced events, every report reaches the page; without them, movement arrives about once per screen refresh and the estimate tops out near your refresh rate. Wireless mice often drop to a lower rate to save power.
Questions
What does "system double-clicks" count?
The double-clicks your operating system recognised, using its own speed setting. If it climbs while you are making single clicks, the switch is doubling up.
The back button still left the page. Why?
Some browsers act on the side buttons before the page can stop them. Use the browser's forward button to return; the results start again from zero.
Can I test a touchpad?
Yes, for clicks and scrolling. Touchpads scroll in small smooth steps that can bounce at the end of a swipe, so reversals mean less there.