A mouse click test with Mouse Tester checks which MouseEvent.button values reach one browser target when you press each available mouse button one at a time. The Mouse Tester listens for button-down events delivered to a large dashed target. For every event the page receives, it increases an overall total and the count for the matching Web button code, while Recent retains the latest eight accepted labels. The target suppresses its own context menu and auxiliary activation so testing a middle or secondary button does not immediately replace the result. It can identify Primary, Auxiliary, Secondary, Back, and Forward events, although those names describe Web event roles rather than guaranteed positions on the mouse. Selecting Reset test clears the current in-memory session. This produces a controlled record of what the current browser and page actually receive; it does not measure click speed, certify the hardware, or observe input outside the target. That distinction is useful when a side button is absent, arrives under an unexpected code, or is handled before the page sees it.
Define the Browser Button Check
A search for a mouse click test can lead to several different tasks, but this guide is for checking button recognition. Here, the task is to confirm that a deliberate press produces a browser event and identify its Web button code. It is not a clicks-per-second exercise, a double-click interval measurement, or a complete hardware inspection. Mouse Tester records button-down events delivered inside its large dashed target. It does not claim to test simultaneous button chords or reconstruct a continuously held-button state.
MouseEvent.button identifies the button associated with a press or release, while MouseEvent.buttons is a bit field representing buttons currently held during other mouse events. The W3C Pointer Events button-property documentation and MDN's MouseEvent.button reference document that distinction. Mouse Tester listens only to button-down events and classifies the single integer code carried by each delivered event, so its counts should not be read as a held-button monitor.
Run One Press per Available Button
- Place the pointer and press. Keep the pointer inside the dashed target. Press the primary, middle, secondary, back, or forward buttons available on your device one at a time, allowing each result to register before continuing.
- Check every delivered event. Confirm that the overall total and matching named button count increase and that a new label appears in Recent in the order received. Under a clean one-press check, one delivered event increases the total and matching named count once.
- Repeat and clear the session. Repeat with the same device in the affected application when needed, noting how that application responds. Return to Mouse Tester as needed and use Reset test to clear the browser-only session before another test run.
Verify Counts, Order, and Button Codes
Mouse Tester uses the Web platform's button mapping rather than guessing from the physical left and right positions:
| MouseEvent.button code | Web label | Meaning |
|---|---|---|
| 0 | Primary | The main activation button in the event model; operating-system settings may assign that role to a different physical side. |
| 1 | Auxiliary | An auxiliary button, commonly a middle or wheel button. |
| 2 | Secondary | The Web platform's secondary-button classification; the tester does not assume a fixed physical position. |
| 3 | Back | Commonly an extra navigation button when the device and browser expose it. |
| 4 | Forward | Commonly an extra navigation button when the device and browser expose it. |
The total represents accepted button-down events in the current session, while each named count separates the five recognized codes. Recent keeps the latest eight accepted labels so you can compare their received order. Other integer codes are retained as Unknown with their numeric value rather than forced into a known name. Fractional values are rejected because the documented mapping uses integer codes. An Unknown label therefore identifies a code outside the five recognized names, but it does not identify the physical button or prove a hardware problem by itself.
Compare Results in the Affected Application
Mouse Tester cannot report an application's event stream because it listens only inside its visible target. To investigate an application-specific problem, make the same deliberate, one-at-a-time presses with the same device in that application and note the result. Then repeat the sequence inside Mouse Tester and compare the browser labels with the application's behavior. Games, design tools, browsers, and operating systems can handle extra buttons differently.
A browser or operating system can intercept a button before the page receives it. Back and Forward presses may navigate browser history, extensions may remap input, accessibility software may synthesize events, and remote-desktop software may alter codes. The target's prevented context-menu and auxiliary behavior reduces accidental actions inside the test area, but it cannot override higher-priority browser or system handling. For that reason, an absent label is evidence about this page session rather than a definitive verdict on the physical switch.
Interpret Missing or Repeated Results
No Count Appeared
Begin with one deliberate press per available button. If the total and expected named count do not move, a zero count means no matching event reached this page during the test. It does not prove that the physical switch failed. If a different named count increases, the page received a button-down event under another code. Repeat several times as a practical check and keep the pointer fully inside the dashed area.
One Press Produced Several Increases
If one physical press makes the total rise more than once, the browser delivered multiple button-down events. Mouse Tester does not debounce those events or determine why they occurred. Compare the behavior with Double Click Test or manufacturer software when appropriate, but do not treat one browser session as a repair diagnosis.
Separate Event Detection From Hardware Diagnosis
- No speed or timing measurement: Mouse Tester does not measure click speed, double-click interval, polling rate, button debounce, or wireless latency.
- No physical-performance measurement: It does not measure switch force, pointer movement, scroll-wheel deltas, or drag behavior.
- No diagnostic certification: It cannot certify hardware condition, accessibility, or game suitability, and it cannot isolate a switch, transport, driver, or application problem from one browser session.
Reset the Browser-Only Session
All counts remain in the current tab's memory. Selecting Reset test clears the session, while refreshing or closing the tab also removes the current state. Reset between comparison runs so counts from separate checks are not mistaken for one continuous test.
The widget does not request a device identifier, install a driver, upload events, save a history, or listen outside the visible test target. The reliable conclusion is limited to the integer MouseEvent.button values delivered inside that target during the current browser session.