How to test mouse buttons and the scroll wheel
- Move your mouse over the test area. The coordinate display updates as your pointer moves inside it, showing that the browser receives motion events.
- Press the primary, secondary, middle or extra buttons while the cursor is inside the test area. The page indicates which browser button event it received. The right-click context menu is suppressed only in the test zone so you can observe the right button.
- Turn the wheel up and down. The tool counts wheel events and shows the direction, including touchpad gestures that browsers report as wheel events.
- Double-click inside the zone to check whether your browser recognizes a double-click event. Use Reset to clear the session counters, then repeat if necessary.
All testing happens inside your browser. The tool reads mouse and pointer events from the area on this page; it never installs drivers, listens to input outside the tab, records your screen or sends event details to our server.
What do the readings mean?
The primary button is usually the left button on a right-handed mouse, but operating systems can swap left and right for accessibility. The browser uses the terms primary and secondary so the test follows your settings. The middle button is often the scroll wheel when pressed. Some gaming mice also have Back and Forward buttons, although browsers or driver software may reserve them for navigation.
On a typical mouse a press generates a mousedown event and a release generates mouseup. A double-click creates its own dblclick event after the ordinary click events. The browser controls the timing threshold for double-click recognition; this site does not know your operating system setting and cannot diagnose switch bounce from one event alone.
The wheel produces a signed delta that says which direction the page was scrolled. Browsers may report deltas as pixels, text lines or pages. For that reason this test counts wheel events and directions, not physical wheel notches or distance in millimeters. Smooth touchpads may generate many tiny events for one gesture.
Common problems and troubleshooting
- Primary button not detected: try a different mouse, USB port or Bluetooth connection. Check your system button mapping.
- Secondary button opens a menu: the website blocks its menu only inside the test area. Your browser or mouse software may still intercept special gestures.
- Double-click behaves unexpectedly: repeat with a slower or faster double-click. Compare with the operating system mouse settings before deciding that a switch is worn.
- Wheel skips or reverses: compare scrolling in another application. Some smooth-scrolling settings and touchpad drivers affect browser events.
- Extra buttons do nothing: some browser navigation shortcuts or device drivers consume Back and Forward events before a web page can read them.
This test cannot measure true hardware polling rate, switch debounce time, Bluetooth latency or sensor DPI. Such metrics require specialized equipment or operating-system access. It is intended as a quick functional check of which standard browser events reach this page.
Other useful checks
To test how fast you can click, open the clicks-per-second test. To see all your keyboard keys while held, use the keyboard tester. For a visual display inspection, the color vision test serves a different purpose and is not a mouse diagnostic.
Frequently asked questions
Why does my left click show Primary?
The operating system may swap left and right button functions. Primary follows the browser-mapped action.
Can this test measure mouse polling rate or DPI?
No. Browser events are affected by scheduling and system settings, so hardware measurements need a dedicated instrument.
Why do side buttons not register?
Back and Forward commands may be intercepted by browser navigation or driver software.
Is mouse movement tracked outside this page?
No. The tool listens only inside its visible test zone and holds temporary counters in page memory.
Last updated: October 17, 2026